EnergietechnikEnergy Technology

J. Lecomte-Beckers, M. Carton,F. Schubert and P. J. Ennis (Editors)

Materials forAdvanced Power Engineering 2006

Proceedings Part I

Schriften des Forschungszentrums JlichReihe Energietechnik / Energy Technology Band / Volume 53, Part I

Forschungszentrum Jlich GmbHInstitut fr Energieforschung

Jacqueline Lecomte-Beckers, Marc Carton,Florian Schubert and Philip J. Ennis (Editors)

Materials for Advanced PowerEngineering 2006

Proceedings of the 8th Lige Conference

Part I

Universit de LigeEuropean CommissionCOSTEuropean Science Foundation

Schriften des Forschungszentrums JlichReihe Energietechnik / Energy Technology Band / Volume 53, Part I

ISSN 1433-5522 ISBN 3-89336-436-6

Publisher Forschungszentrum Jlich GmbHand Distributor: Zentralbibliothek, Verlag

D-52425 JlichTelefon (02461) 61-5368 Telefax (02461) 61-6103e-mail: zb-publikation@fz-juelich.deInternet: http://www.fz-juelich.de/zb

Cover Design: Grafische Medien, Forschungszentrum Jlich GmbH

Printer: Grafische Medien, Forschungszentrum Jlich GmbH

Copyright: Forschungszentrum Jlich 2006

Schriften des Forschungszentrums JlichReihe Energietechnik / Energy Technology Band / Volume 53, Part I

ISSN 1433-5522ISBN 3-89336-436-6

Neither this book nor any part may be reproduced or transmitted in any form or by any means,electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage and retrieval system, without permission in writing from the publisher.

Bibliographic information published by Die Deutsche Bibliothek.Die Deutsche Bibliothek lists this publication in the DeutscheNationalbibliografie; detailed bibliographic data are available in theInternet at .

iii

FOREWORD

The European Co-operation in the field of Scientific and Technical Research (COST) is a well-established organisation for the co-ordination of national research and development programmes on the European level. The series of Lige conferences began in 1978 with the aim of disseminating the results of the COST Action 50 in which materials for gas turbines were investigated. Since then, a Lige Conference has been held every four years and the results of COST Actions 501 and 522, which were concerned with materials for power generation plant, reported. At this, the Eighth Lige Conference, the materials research and development work being carried out in the current COST Actions 536 Alloy Development for Critical Components of Environmentally Friendly Steam Power Plant with the acronym ACCEPT and 538 High Temperature Plant Lifetime Extension will be reported.

Reliable energy supply at reasonable cost is one of the most important factors in the development and maintenance of the modern industrial society, but there are increasing concerns about the environmental impact of energy production as well as about the need to conserve valuable energy resources for future generations. New and emerging energy technologies are of great interest, but fossil fuels will continue to make a considerable contribution to energy requirements into the foreseeable future. The emphasis in this field is therefore on the most efficient use of fossil fuels, which can be achieved by increasing the thermal efficiency of the energy conversion process. For steam power plant and gas turbines, this means raising the temperature and pressure of the process. This in turn requires the application of improved materials that are able to withstand the increasingly arduous service conditions.

In the COST Actions, the materials research and development activities that are necessary for the critical components of advanced, highly efficient power generation plant have been based on the principle of work-sharing, bringing together materials scientists and engineers, plant designers, alloy producers, component manufacturers, plant constructors and plant operators. This constellation of expertise reflects the need to match materials properties to component behaviour.

In order to put the European efforts into a world-wide scenario, there are in this conference a number of invited papers that will discuss the energy perspectives and the development of power plant materials in the USA, Japan, India and China.

The Conference Proceedings are organised as follows:

Part I: INAUGURAL SESSION Invited papers

EUROPEAN ENERGY MATERIALS RESEARCH Invited papers

ENERGY PERSPECTIVES Invited papers

ivADVANCED GAS TURBINE MATERIALS

Invited papers Contributed papers

Mechanical properties Microstructure

Part II: ADVANCED GAS TURBINE MATERIALS Contributed papers

Modelling Joining technology Oxidation and hot corrosion Coating technology Intermetallics and ceramics

ADVANCED STEAM TURBINE MATERIALS Invited papers Contributed papers Mechanical properties

Part III: ADVANCED STEAM TURBINE MATERIALS Contributed papers

Microstructure Modelling and alloy design

Welding technology Steam oxidation and coatings Austenitic and nickel-base alloys

ADDENDUM

The Technical and Editorial Board members would like to express their gratitude to all the members of the COST 536 and COST 538 Management Committees, for their supervision and support of the considerable research and development efforts, both in their own countries and across national borders. Those who were involved in the reviewing of the submitted papers are also sincerely thanked for their important contribution to the production of the Proceedings.

Research Centre Jlich - 50 Years of Innovation

Addressing society's challenges, questions and expectations and delivering solutions with the

aid of excellent, strategically positioned research: this is the mission that Research Centre

Jlich has been involved in ever since its foundation 50 years ago. Over the course of the

years, it has undergone a huge transition, moving from research focused on the peaceful uses

of nuclear energy to a research enterprise run on a multi-programmatic and interdisciplinary

basis with an internationally unrivalled profile.

The key to this profile is the close linking of Jlich's traditional core competence, physics, to

the other sciences. The basic insights gained in physics contribute decisively to a better

understanding of the complex systems in energy, chemistry, biology, medicine and the

geosciences, while the questions encountered in these fields extend the approaches adopted in

physics. A further core competence that has evolved in Jlich with a remarkable momentum

over the last few years is scientific computing. The operation of medium and large-scale

equipment and a well-developed scientific and technical infrastructure round off the profile.

This leads to the co-operation between and mutual enrichment of the different areas of

expertise in Jlich, which remains internationally unparalleled in both nature and intensity.

The positive effect of this cross-linking is further enhanced through strategic alliances with

other centres in the Helmholtz Association, as well as with universities, industrial companies

and research institutions worldwide.

The Research Centre Jlich will use this profile as a focal point for its research over the next

two decades, making thus significant future contributions to the following four grand

challenges: responsible management of the environment's natural resources, sustainable and

comprehensive energy supply, securing food for and the health of a growing world

population, and the provision and solutions-orientated linking of large quantities of

information.

- vii -

TABLE OF CONTENTS

Part I

Foreword iii Table of Contents vii

INAUGURAL SESSION

ENGINEERING SUSTAINABILITY 5 Wall G

THE EU RESEARCH STRATEGY TOWARDS ZERO EMISSION FOSSIL FUEL POWER PLANTS

25

Dechamps P

EUROPEAN ENERGY MATERIALS RESEARCH

MATERIALS DEVELOPMENT FOR BOILERS AND STEAM TURBINES OPERATING AT 700 C

I 41

Blum R, Vanstone R W

THE EUROPEAN WAY TO 700C COAL FIRED POWER PLANT I 61 Tschaffon H

MATERIALS ASPECTS OF SOLID OXIDE FUEL CELLS I 69 Steinbrech R, Menzler N H, Batfalsky P, Blum L

MATERIALS FOR EXTREME ENVIRONMENTS IN FUSION APPLICATIONS

I 81

Bolt H, Maier H

DEVELOPMENT AND CURRENT STATUS OF ECCC CREEP PROPERTY DATA SHEETS

I 91

Holdsworth S R (see also Part III 1722, Addendum)

ENERGY PERSPECTIVES

EVALUATION OF THE MATERIALS TECHNOLOGY REQUIRED FOR A 760C POWER STEAM BOILER

I 107

Shingledecker J P, Wright I G

CURRENT AND 2050 ENERGY PERSPECTIVES IN INDIA: OPPORTUNITIES FOR MATERIALS SCIENTISTS AND TECHNOLOGISTS

I 121

Baldev Raj, B S Rao Kota

viii

MATERIALS CHALLENGES IN CO2 CAPTURE AND STORAGE I 143 Mathieu P

THE HYDROGEN ECONOMY I 161 Birnbaum U, Hake J-F, Linssen J, Walbeck M

ADVANCED POWER PLANT DEVELOPMENTS AND MATERIAL EXPERIENCES IN JAPAN

I 175

Masuyama F

DEVELOPMENT OF HIGH TEMPERATURE MATERIALS FOR ENERGY MARKET IN CHINA

I 189

Hu Z Q, Guo J T

ADVANCED GAS TURBINE MATERIALS

Invited papers

DEGRADATION IN SINGLE CRYSTAL NICKEL-BASE SUPERALLOYS A REVIEW

I 205

Nazmy M, Epishin A, Link T, Staubli M

RECENT ADVANCES IN NDT TECHNIQUES FOR GAS TURBINE COATINGS

I 217

Osgerby S, Rinaldi C, De Maria L

GAS TURBINE ISSUES IN ADVANCED GASIFICATION SYSTEMS I 233 Wenglarz R, Oakey J

MATERIALS PROBLEMS AND SOLUTIONS IN BIOMASS FIRED PLANTS I 245 Larsen O H, Montgomery M

RE-QUALIFICATION OF BOILER DRUMS IN THERMAL POWER PLANT I 261 Brziak P, Bernasovsk P

(see also Part III 1696, Addendum)

Contributed papers: Mechanical properties

DEVELOPMENT OF NI-BASED SINGLE CRYSTAL SUPERALLOYS FOR POWER-GENERATION GAS TURBINE BLADES

I 273

Hashizume R, Yoshinari A, Kiyono T, Murata Y, Morinaga M

A 5TH GENERATION NI-BASE SINGLE CRYSTAL SUPERALLOY WITH SUPERIOR ELEVATED TEMPERATURE PROPERTIES

I 287

Sato A, Yeh A C, Kobayashi T, Yokokawa T, Harada H, Murakumo T, Zhang J

ix

EFFECT OF PLASTIC ANISOTROPY ON CREEP STRENGTH OF SINGLE CRYSTAL NI-BASED SUPERALLOYS

I 299

Koyabu H, Tsuno N, Kakehi K

DEVELOPMENT OF CO-FREE NI-BASE SINGLE CRYSTAL SUPERALLOY I 309 Yokokawa T, Kobayashi T, Suzuki T, Koizumi Y, Harada H

THE EFFECT OF HIGH TEMPERATURE CREEP DAMAGE ON LOW CYCLE FATIGUE IN CMSX-4

I 317

Epishin A, Link T, Brckner U, Klingelhffer H, Portella P

THE LONG-TERM CREEP PROPERTY OF NICKEL-BASE SINGLE-CRYSTAL SUPERALLOYS

I 327

Koizumi Y, Harada H, Yokokawa T, Kobayashi T

INFLUENCE OF SOLIDIFICATION CONDITIONS ON HOMOGENISATION HEAT TREATMENT AND MECHANICAL PROPERTIES IN SINGLE CRYSTAL NICKEL-BASE SUPERALLOYS

I 335

Lamm M, Volek A, Luesebrink O, Singer R F

PREDICTION OF THERMAL MECHANICAL FATIGUE PROPERTIES OF NI-BASE SINGLE CRYSTAL SUPERALLOYS

I 347

Ohata H, Yokokawa T, Kobayashi T, Ro Y, Harada H

DEVELOPMENT OF A HIGH STRENGTH NI-BASED SUPERALLOY FOR CONVENTIONAL CASTING

I 355

Tamaki H, Yoshinari A, Doi H

HIGH TEMPERATURE PROPERTIES OF SELECTED NI-BASE SUPERALLOYS

I 365

Hakl J, Vlask T

HOT ISOSTATIC PRESSING PROCESS TO REJUVENATE SERVICED CAST NICKEL-BASE SUPERALLOY IN738 TURBINE BLADES

I 377

Wangyao P, Zrnik J, Polsilapa S, Nisaratanaporn E, Homkrajai W

DEVELOPMENT OF NEW SUPERALLOYS FOR TURBINE DISK APPLICATIONS

I 385

Gu Y, Cui C, Ping D, Harada H, Sato A, Fujioka J

INFLUENCE OF CARBIDES AND OXIDATION ON THERMAL FATIGUE BEHAVIORS OF TWO NICKEL-BASE SUPERALLOYS

I 393

Li Y L, Yuan C, Guo J T, Hou J S

LOW CYCLE FATIGUE BEHAVIOR OF WROUGHT NICKEL BASED SUPERALLOY GH413

I 403

Guo X G, Guo J T, Yuan C, Yang H C

x

EFFECT OF CARBIDES ON THERMAL FATIGUE PROPERTY OF K465 CAST SUPERALLOY

I 413

Guan H R, Yang J X, Zheng Q, Wang Y L, Sun X F, Hu Z Q

ENVIRONMENTAL EFFECT ON HIGH TEMPERATURE FATIGUE BEHAVIOUR OF A NICKEL BASE SUPERALLOY FOR TURBINE DISCS

I 423

Marchionni M, Onofrio G, Osinkolu G A

INFLUENCE OF SOLUTION HEAT TREATMENT CONDITIONS ON GAMMA PRIME CHARACTERISTICS IN A HOT CORROSION RESISTANT SUPERALLOY

I 435

Hou J S, Guo J T, Zhou L Z, Li J Z, Qin X Z, Li Y L, Ye H Q

Contributed papers: Microstructure

MORPHOLOGICAL EVOLUTION OF GAMMA PRIME AND M23C6 CARBIDE IN A CAST NI-BASE SUPERALLOY IN THE DIFFERENT TREATMENT CONDITIONS

I 447

Qin X Z, Guo J T, Yuan C, Hou J S, Ye Q H

DISLOCATION SUBSTRUCTURE IN -CHANNEL OF SINGLE CRYSTAL NICKEL-BASED SUPERALLOY, CMSX-4, CREPT AT 1273 K, 160 MPA

I 455

Kondo Y, Miura N, Matsuo T

DISLOCATION SUBSTRUCTURE AT /' INTERFACE OF SINGLE CRYSTAL NICKEL-BASED SUPERALLOY CMSX-4 CREPT AT 1273 K, 250 MPA

I 465

Miura N, Tanaka F, Kurita K, Kondo Y, Matsuo T

MODELLING OF RAFTING AND ITS INFLUENCE IN NI-BASE SUPERALLOYS

I 475

Fedelich B, Knecke G, Epishin A

TEM MICROSTRUCTURAL ANALYSIS OF CREEP DEFORMED CM186LC SINGLE CRYSTAL NI-BASE SUPERALLOY

I 485

Dubiel B, Blackler M, Barnard P M, Czyrska-Filemonowicz A

ATOM PROBE MICROANALYSIS OF FIFTH-GENERATION NI-BASE SINGLE-CRYSTAL SUPERALLOYS

I 495

Kitashima T, Ping D H, Harada H, Kobayashi T

MICROSTRUCTURAL STABILITY OF CMSX-4 AND CMSX-10 UNDER HIGH TEMPERATURE CREEP CONDITIONS

I 507

Epishin A, Link T, Brckner U

X-RAY TOMOGRAPHY FOR POROSITY ANALYSIS IN SINGLE-CRYSTAL NI-BASE SUPERALLOYS

I 521

Link T, Zabler S, Haibel A, Epishin A

xi

DEFORMATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION DURING HOT WORKING PROCESS OF NICKEL-BASE ALLOY GH742

I 533

Zhang B, Zhao G, Xu G, Feng D

ORIENTATION DEPENDENCE OF SECONDARY REACTION ZONES IN SURFACE MODIFIED NI-BASED SINGLE CRYSTAL SUPERALLOYS

I 541

Murakami H, Sakai T, Shibata M, Yamaguchi A, Kuroda S

STUDY ON THE INVESTMENT CASTING PROCESS OF K418 SUPERALLOY TURBINE

I 549

Li J, Zhao M, Shao C, Kong S, Wu J, Li W

STUDY ON CASTING PROCESS OF K4537 SUPERALLOY GAS TURBINE I 555 Shao C, Li J, Zhao M, Li W, Wu J, Kong S

DIFFUSION COEFFICIENT OF REFRACTORY ELEMENTS IN MULTI-COMPONENT NI-ALLOY

I 561

Murata Y, Hattori M, Efendi, Goto N, Koyama T, Morinaga M

MICROSTRUCTURAL DEGRADATION OF HAYNES 230 COMBUSTOR HARDWARE

I 571

Marchant G, McColvin G, Strang A

SHOT PEENING INDUCED RECRYSTALLIZATION IN A DIRECTIONALLY SOLIDIFIED NI-BASE SUPERALLOY

I 583

Zhang J, Wang L, Xie G, Sun C, Lou L H

AUTHOR INDEX I

KEYWORD INDEX VII

xii

Part II

ADVANCED GAS TURBINE MATERIALS

Contributed papers: Modelling

MICRO-MECHANICAL MODELLING OF THE SINGLE CRYSTAL NICKEL-BASE SUPERALLOY CMSX-4

II 595

Tinga T, Geers M G D, Brekelmans W A M

MODELLING THE CONSTANT AND VARIABLE LOADING / TEMPERATURE CREEP BEHAVIOUR OF UDIMET 720LI

II 607

Maldini M, Lupinc V

A GENERAL APPROACH TO MICROSTRUCTURAL MODELLING OF CREEP

II 619

Pein C, Kozeschnik E

Contributed papers: Joining technology

THE CREEP RUPTURE BEHAVIOUR OF A NICKEL-BASE SINGLE-CRYSTAL SUPERALLOY AFTER TLP BONDING

II 627

Liu J D, Jin T, Zhao N R, Wang Z H, Sun X F, Guan H R, Hu Z Q

NANOINDENTATION AND ORIENTATION MEASUREMENTS IN SINGLE CRYSTALLINE BRAZING JOINTS OF NICKEL BASE SUPERALLOYS

II 633

Dinkel M, Pyczak F, Gken M, Heinz P, Volek A, Singer R F, Ott M, Affeldt E, Vossberg A

Contributed papers: Oxidation and hot corrosion

LONG-TIME HIGH-TEMPERATURE OXIDATION OF MA 6000 AND PM 3030 ODS SUPERALLOYS

II 645

Maresca P, Pratesi F, Terzigli V, Innocenti M, Giorni E

OXIDATION RESISTANCE OF SILICON-CONTAINING 5TH GENERATION NICKEL-BASE SINGLE CRYSTAL SUPERALLOYS

II 655

Sato A, Harada H, Ang J, Yutaka K, Toshiharu K, Kawagishi K, Imai H

ESTIMATION OF THE RISK OF HOT CORROSION IN GAS TURBINES BY THERMODYNAMIC MODELLING

II 665

Mller M

xiii

Contributed papers: Coating technology

MICROSTRUCTURAL INVESTIGATIONS AND MODELLING OF INTERDIFFUSION BETWEEN MCRALY COATING AND IN738 SUPERALLOY

II 675

Dahl K V, Hald J

DEVELOPMENT OF EQ COATINGS FOR A NEW TBC COATING SYSTEM IN NI-BASE SUPERALLOYS

II 691

Kawagishi K, Sato A, Matsumoto K, Ang J, Harada H

COATINGS BY LASER CLADDING AGAINST LIQUID DROPLET EROSION II 699 Giannozzi M, Giorni E, Giovannetti I, Pratesi F, Zonfrillo G

A NEW DEVICE FOR TESTING COATINGS UNDER THERMAL SHOCK II 707 Zonfrillo G, Giannozzi M, Pratesi F, Giorni E

CHARACTERIZATION OF THERMAL BARRIER COATINGS BY MEANS OF FURNACE CYCLE TESTING

II 717

Cappuccini F, Zonfrillo G, Pratesi F, Giannozzi

ACOUSTIC EMISSION ANALYSIS USED AS MONITORING TOOL FOR BURNER RIG TESTS OF THERMAL BARRIER COATINGS

II 727

Mack D E, Casu A, Traeger F, Vaen R, Stver D

PRACTICAL APPLICATIONS OF TEMPERATURE ESTIMATION MODELS BASED ON SUPERALLOY BASE METAL AND MCRALY COATING MICROSTRUCTURE EVOLUTION IN SERVICE GAS TURBINE COMPONENTS

II 737

Hussain K, Daleo J A

NUMERICAL SIMULATION OF TBC DELAMINATION UNDER THERMAL CYCLIC LOADING

II 747

Biaas M, Bednarz P, Herzog R

OXIDATION AND HOT CORROSION BEHAVIOUR OF ALUMINIZED PT-IR COATINGS ON NI-BASED SUPERALLOYS TMS-82+

II 757

Yamaguchi A, Wu Y N, Suzuki A, Murakami H, Kuroda S, Imai H

Contributed papers: Intermetallics and ceramics

CREEP BEHAVIOR OF ORTHORHOMBIC TI2ALNB-BASED ALLOYS II 767 Hagiwara M, Emura S, Mao Y

COMPARISON OF THE ISOTHERMAL FATIGUE BEHAVIOUR OF TIMETAL 6242 AND -TIAL ALLOYS AT 700C

II 773

Cempura G, Penkalla H J, Schubert F, Czyrska-Filemonowicz A

xiv

TIAL OXIDATION PROTECTION IMPROVEMENTS USING THE HALOGEN EFFECT

II 783

Masset P, Zschau H-E, Schtze M

THERMAL EXPOSURE EFFECTS ON THE MECHANICAL PROPERTIES OF TIAL INTERMETALLIC

II 793

Holdway P, Lucas K, Wisbey A

DIRECTIONALLY SOLIDIFIED MULTIPHASE NI3AL-BASED INTERMETALLICS FOR HIGH TEMPERATURE APPLICATIONS

II 803

Lapin J, Pelachov T, Mareek J

SUPERPLASTIC DEFORMATION AND MECHANISM OF EXTRUDED EUTECTIC NIAL/CR(MO) ALLOY DOPED WITH DY

II 819

Guo J T, Du X, Li G

FEM STUDY OF A CMC SHROUD II 829 Del Pugliaa P, Lanese N, Zonfrilloa G

ADVANCED STEAM TURBINE MATERIALS

Invited papers

THE EUROPEAN EFFORT IN DEVELOPMENT OF NEW HIGH TEMPERATURE ROTOR MATERIALS COST 536

II 843

Kern T -U, Staubli M, Mayer K H, Donth B, Zeiler G, DiGianfrancesco A

THE EUROPEAN EFFORTS IN DEVELOPMENT OF NEW HIGH TEMPERATURE CASING MATERIALS COST 536

II 855

Staubli M, Hanus R, Weber T, Mayer K H, Kern T-U

WELDABILITY AND PROPERTIES OF NEW CREEP RESISTANT MATERIALS FOR USE IN ULTRA SUPERCRITICAL COAL FIRED POWER PLANTS

II 871

Baun E, Cerjak H, Caminada S, Jochum C, Mayr P, Pasternak J

US PROGRAM ON MATERIALS TECHNOLOGY FOR ULTRASUPERCRITICAL STEAM-COAL FIRED POWER PLANTS

II 893

Viswanathan R, Henry J F, Tanzosh J, Stanko G, Shingledecker J P, Vitalis B

METALLOGRAPHY AND ALLOY DESIGN IN THE COST 536 ACTION II 917 Hald J

MATERIALS DEVELOPMENT FOR ADVANCED STEAM BOILERS II 931 Helmrich A, Chen Q, Stamatelopoulos G, Scarlin B

xv

COATINGS FOR PROTECTION OF HIGH TEMPERATURE NEW GENERATION STEAM PLANT COMPONENTS: A REVIEW

II 949

Aguero A

METALLURGY FOR LONG-TERM STABILIZATION OF FERRITIC STEELS FOR THICK SECTION BOILER COMPONENTS IN USC POWER PLANT AT 650OC

II 965

Abe F

Contributed papers: Mechanical properties

CONTRIBUTION TO THE INVESTIGATION OF ADVANCED LOW-ALLOY P23 STEEL CREEP BEHAVIOUR

II 985

Hakl J, Vlask T, Brziak P, Zifcak P

EFFECT OF TEMPERING TIMES ON CREEP STRENGTH IN ASME GR 23 (2 25CR-1 6W STEEL)

II 997

Komai N, Imazato T

CREEP OF 0.5CrMoV STEEL AT VERY LOW STRAIN RATES II 1011 Kloc L, Sklenica V

IMPROVEMENT IN CREEP STRENGTH OF HEAT RESISTANT FERRITIC STEEL STRENGTHENED BY INTERMETALLIC COMPOUND

II 1019

Toda Y, Kushima H, Kimura K, Abe F

SUPERIOR LONG-TERM CREEP BEHAVIOUR AND MICROSTRUCTURAL EVOLUTION OF 9%CR-STEELS WITH BORON

II 1031

Kager F, Bck N, Spiradek-Hahn K, Hfinger S, Brabetz M, Zeiler G

ALLOY DESIGN AND CREEP STRENGTH OF ADVANCED 9%CR USC BOILER STEELS CONTAINING HIGH BORON

II 1041

Semba H, Abe F

IMPROVEMENT OF CREEP STRENGTH OF 650 C FERRITIC/MARTENSITIC SUPER HEAT RESISTANT 11-12 % CR STEELS

II 1053

Mayer K-H, Berger C, Scholz A, Wang Y

STATUS OF DEVELOPMENT OF THE VM12 STEEL FOR TUBULAR APPLICATIONS IN ADVANCED POWER PLANTS

II 1065

Gabrel J, Bendick W, Vandenberghe B, Lefebvre B

MICROSTRUCTURAL DEVELOPMENT OF VM12 STEEL CAUSED BY CREEP DEFORMATION AT 625C

II 1077

Zieliska-Lipiec A, Bendick W, Cempura G, Vandenberghe B, Ennis P J, Czyrska-Filemonowicz A

REGENERATIVE HEAT TREATMENT OF L21HMF CAST STEEL AFTER LONG TERM OPERATION

II 1087

Golanski G, Kupczyk J, Stachura S, Gajda B

xvi

LONG TERM CREEP STRENGTH DEGRADATION IN T122/P122 STEELS FOR USC POWER PLANTS

II 1095

Igarashi M, Yoshizawa M, Iseda A, Matsuo H, Kan T

DEGRADATION BEHAVIOUR AND LONG-TERM CREEP STRENGTH OF 12CR FERRITIC CREEP RESISTANT STEELS

II 1105

Kimura K, Sawada K, Kushima H, Toda Y

CREEP CURVE ANALYSIS USING THE MODIFIED METHOD II 1117 Yin Y F, Faulkner R G

EFFECT OF NON STEADY LOADING ON CREEP BEHAVIOUR OF ADVANCED 9-12 % FOSSIL POWER PLANT STEELS

II 1127

Sklenicka V, Kucharova K, Svoboda M, Kloc L, Kudrman J

CREEP AND CREEP FATIGUE PROPERTIES OF TURBINE STEELS FOR APPLICATION TEMPERATURES UP TO 625 C

II 1137

Berger C, Schwienheer M, Scholz A

LOW CYCLE FATIGUE BEHAVIOUR OF SANDWICH STRUCTURES OF P92 AND NICROFER 6025 HT

II 1147

El-Magd E, Stuhrmann J, Gebhard J

CAUSES OF CREEP FRACTURE MECHANISM CHANGE IN 9CR-1 8W-0 5Mo-VNb STEEL

II 1157

Lee J S, Arnaki H G, Maruyama K, Muraki T, Asahi H

AUTHOR INDEX I

KEYWORD INDEX VII

xvii

Part III

ADVANCED STEAM TURBINE MATERIALS

Contributed papers: Microstructure

MICROSTRUCTURAL CHARACTERIZATION OF MODERN BORON CONTAINING 9-11 % CR STEELS DEVELOPED IN THE FRAMEWORK OF THE COST PROGRAM

III 1171

Kauffmann F, Mayer K H, Straub S, Zies G, Scheu C, Willer D, Ruoff H, Maile K

QUANTITATIVE MICROSTRUCTURAL ANALYSIS ON THE STABILITY OF MX AND M2X IN 9-12 % CR STEELS BY AFM, SEM, TEM

III 1181

Seibert T, Durst K, Chilukuru H, Gken M

SIMULATION OF THE PRECIPITATION KINETICS DURING HEAT TREATMENT AND SERVICE OF CREEP RESISTANT MARTENSITIC 9-12% CR STEEL

III 1191

Holzer I, Rajek J, Kozeschnik E, Cerjak H

MICROSTRUCTURAL ANALYSIS ON A CREEP RESISTANT MARTENSITIC 9-12% CR STEELS USING THE EBSD METHOD

III 1199

Sonderegger B, Mitsche S, Cerjak H

DISLOCATION MOBILITY IN 9% CHROMIUM STEELS EXPOSED TO CREEP

III 1207

Bck N

EFTEM INVESTIGATIONS ON PRECIPITATES IN A CREEP RESISTANT 9-12% CR STEEL

III 1217

Sonderegger B, Kothleitner G, Rechberger W, Cerjak H

PRECIPITATION BEHAVIOR OF Z PHASE AFTER LONG-TERM CREEP IN HIGH CHROMIUM FERRITIC HEAT RESISTANT STEELS

III 1227

Sawada K, Kushima H, Kimura K

ON THE ROLES OF M2X AND Z-PHASE IN TEMPERED MARTENSITIC 9-12% CR-STEELS

III 1241

Chilukuru H, Durst K, Gken M, Blum W

ELECTRON DIFFRACTION STUDIES ON (Nb,V)CrN PARTICLES IN 12CrMoVNbN STEELS

III 1251

Vodarek V, Danielsen H, Grumsen F, Hald J, Strang A

xviii

AN EFTEM STUDY OF Z-PHASE NUCLEATION IN MARTENSITIC CHROMIUM STEELS

III 1267

Golpayegani A, Andren H O

Z-PHASE IN 9-12%CR STEELS - OBSERVATIONS AND THERMODYNAMIC MODELLING

III 1275

Danielsen H K, Hald J

MICROSTRUCTURE AND STEAM OXIDATION RESISTANCE OF LAVES PHASE FORMING 12%CR STEELS AT 600-650C

III 1285

Pirn Abelln J, Ennis P J, Singheiser L, Quadakkers W J

Contributed papers: Modelling

CDM MODELLING OF POWER PLANT FERRITIC STEELS III 1299 Yin Y F, Faulkner R G

AN EFFECTIVE PARAMETRIC STRAIN MODEL FOR CREEP III 1309 Holmstrm S, Auerkari P, Holdsworth S

ADVANCED ALLOY DESIGN TOOLS APPLIED TO THE DEVELOPMENT OF VANADIUM NITRIDE STRENGTHENED HIGH-TEMPERATURE STEELS

III 1319

Gaude-Fugarolas D, Yardley V, Lardon J-M, Montagnon J, De Carlan Y

Contributed papers: Welding technology

APPLICATION OF BAINITIC CREEP RESISTING STEELS FOR SUPERCRITICAL PARAMETERS AND PROPERTIES OF WELDED JOINTS

III 1331

Brzda J, Zeman M, Pasternak J

INVESTIGATIONS ON OPTIMISATION OF WELD CREEP PERFORMANCE IN MARTENSITIC STEELS

III 1341

Bauer M, Klenk A, Maile K, Roos E, Jochum C

STRUCTURAL STABILITY AND PROPERTIES OF WELD JOINTS OF NEW CREEP-RESISTANT STEEL GRADES WITH 9 OR 12% CR CONTENTS APPLIED IN OPERATION OF POWER GENERATIONS SECTOR OVER 30000 h

III 1357

Moskal G, Hernas A, Pasternak J

WELDABILITY AND HIGH TEMPERATURE BEHAVIOR OF 12% CR-STEEL FOR TUBES AND PIPES IN POWER PLANTS WITH STEAM TEMPERATURES UP TO 650 C

III 1369

Vekeman J, Dhooge A, Huysmans S, Vandenberghe B, Jochum C

EXPECTED CREEP LIFE OF WELDED 9-12% CR STEELS III 1381 Auerkari P, Holmstrm S, Salonen J

xix

STUDY OF THE SIMULATED HAZ OF A BORON ALLOYED CREEP RESISTANT 9% CHROMIUM STEEL

III 1393

Mayr P, Cerjak H

MICROSTRUCTURAL STUDIES OF SIMILAR AND DISSIMILAR WELDS OF P91

III 1401

Jandova D, Kasl J, Folkova E, Kanta V

PHYSICAL SIMULATION AND NUMERICAL MODELLING OF X10CRMOVNB 9 10 (P91) STEEL REPAIR WELDING

III 1417

Lomozik M, Tasak E

DISSIMILAR WELDED JOINTS WITHOUT A BUFFER AREAS OF STEEL TYPE 9CR WITH 1CRMOV TO BE USED FOR STEAM BOILER PIPELINES

III 1427

Tasak E, Hernas A, Pasternak J, Fudali S

CREEP PROPERTIES OF HETEROGENEOUS P91/P23 WELDS AT 550 AND 600 C

III 1437

Kubo Z, Vodrek V, Touov D

STRUCTURAL STABILITY OF HETEROGENEOUS WELD JOINT OF 6CRMOV 8-3-2 AND X12CRMOV 10-1 STEELS WITH INCREASED NITROGEN CONTENT

III 1449

Foret R, Zlmal B, Sopouek J, Burk J

Contributed papers: Oxidation and coatings

OXIDATION OF CANDIDATE CHROMIUM STEELS IN STEAM ENVIRONMENT

III 1461

Cizner J, Hakl J

OXIDE SCALE GROWTH AND SPALLATION IN STEAM ENVIRONMENTS AN ASSESSMENT OF DIFFERENT MODELLING APPROACHES

III 1469

Fry A T, Osgerby S

THE INFLUENCE OF OXIDATION ON LONG TERM CREEP RUPTURE STRENGTH DATA

III 1479

Allen D J, Harvey B

NEW EXPERIENCE IN THE FIELD OF APPLICATION OF CORROSION RESISTANCE PROTECTION IN FLUE GAS DESULPHURISATION PLANT ABSORBERS

III 1491

Hernas A, Imosa M, Pasternak J, Fudali S

CORROSION AND OXIDATION EXPERIENCES IN AVEDRE II MULTIFUEL BOILER

III 1503

Montgomery M, Jensen S A, Biede O, Larsen O H, Andersson A

xx

HEAT EXCHANGER CORROSION IN BIOMASS AND COAL CO-FIRED POWER PLANTS

III 1513

Simms N J, Kilgallon P J, Oakey J E

HOT CORROSION MONITORING OF ALLOY 617 IN MOLTEN CHLORIDES USING ELECROCHEMICAL TECHNIQUES

III 1523

Prez, F J, Hierro M P, Nieto J

METAL WASTAGE IN LOW ALLOY STEELS UNDER ALTERNATING ATMOSPHERES AT ELEVATED TEMPERATURE

III 1533

Osgerby S, Gohil D D

DEVELOPMENT OF ALUMINIDE DIFFUSION COATINGS FOR HEAT EXCHANGER MATERIALS AND THEIR CREEP-CORROSION RESISTANCE IN SIMULATED COAL FIRING ENVIRONMENT

III 1543

Rohr V, Weber T, Schtze M, Ennis P J, Quadakkers W J

DEVELOPMENT AND VALIDATION OF ADVANCED OXIDATION PROTECTIVE COATINGS FOR SUPER CRITICAL STEAM POWER PLANT

III 1553

Henderson M B, Scheefer M, Aguero A, Allcock B, Norton B, Tsipas D N, Durham R

IMPROVEMENT OF OXIDATION RESISTANCE OF TUBES BY PULSED SILICONISING

III 1571

Maile K, Berreth K, Lyutovich A

INFLUENCE OF SURFACE TREATMENT ON THE OXIDATION KINETICS OF ADVANCED STEELS IN FLOWING STEAM AT 650 C

III 1581

Knoedler R, Straub S

LONG TERM STEAM OXIDATION RESISTANCE OF SHOT-BLASTED STAINLESS STEEL TUBING

III 1589

Minami Y, Fukui T

Contributed papers: Austenitics and Ni-base alloys

QUALIFICATION OF NI-BASED MATERIAL FOR TUBES AND PIPING OF 700C POWER PLANT

III 1597

Klenk A, Maile K, Theofel H, Helmrich A, Husemann R U, Ldenbach G

AN INVESTIGATION ON STRUCTURE STABILITY AND ITS IMPROVEMENT ON A NEW DEVELOPMENTAL NI-CR-CO-MO-NB-TI-AL SUPERALLOY FOR USC POWER PLANT APPLICATION AT TEMPERATURE ABOVE 750C

III 1609

Xie X, Zhao G, Dong J, Smith G D, Baker B A, Patel S J

CHEMISTRY MODIFICATIONS OF INCONEL 706 FOR IMPROVED MICROSTRUCTURAL STABILITY

III 1619

Del Genovese D, Mukherji D, Rsler J, Kindratschuk V, Wabderka N, Banhart J

xxi

CRACK GROWTH BEHAVIOUR OF WASPALOY AT 700C IN DIFFERENT ATMOSPHERES

III 1629

Penkalla H J, Schubert F, Singheiser L

ASSESSMENT OF THE INFLUENCE OF LASER-DRILLED HOLES ON THE DAMAGE BEHAVIOUR OF ALLOY 617

III 1639

Mlders B, Wessel E, Schubert F

DEFORMATION BEHAVIOUR OF ALLOY INCONEL 617 TUBES IN THE TEMPERATURE RANGE 600C TO 850C

III 1651

Makhele-Lekala L, Ennis P J, Schubert F

FIELD TESTING OF TP 347H FG AT ULTRA SUPERCRITICAL STEAM CONDITIONS

III 1663

Hansson A N, Montgomery M

AN IMPROVED METHOD TO CALCULATE THE CREEP-FATIGUE ENDURANCE OF TYPE 316H STAINLESS STEEL

III 1673

Spindler M

WEB-ENABLED DATABASES OF JRC PETTEN-EFFECTIVE TOOLS FOR EUROPEAN KNOWLEDGE MANAGEMENT

III 1683

Over H H, Dietz W

ADDENDUM These papers arrived too late for reviewing and are reproduced as received

ADVANCED COATINGS FOR GAS TURBINES III 1696 Nicholls J R, Bordenet B

APS-TBC FOR GAS TURBINES: FAILURE MODES, DAMAGE EVOLUTION AND LIFE-TIME ASSESSMENT

III 1722

Herzog R, Bednarz P, Trunova O, Steinbrech R W, Wessel E, Quadakkers W J, Schubert F, Singheiser L

AUTHOR INDEX I

KEYWORD INDEX VII

Part I

Inaugural Session

European Energy Materials Research

Energy Perspectives

Advanced Gas Turbine Materials

Part I

Inaugural Session

Invited papers

ENGINEERING SUSTAINABILITY

Gran Wall

International Exergy Institute, Sweden, http://exergy.se

Abstract

Humankind faces the most serious challenge ever sustainable development. This is described from a physical and ecological perspective. A new engineering paradigm based on increasing natures capital instead of exploiting it is presented, as well as fundamental ecological principles and exergy based concepts and methods in order to understand, analyze and optimize engineering processes towards sustainability.

Keywords: Sustainable development, Environmental sciences, Ecological engineering, Energy and Natural resources, Exergy

Introduction

The ongoing depletion of natures capital must come to an end before it is too late. Values are lost and substances are spread in the environment when natures capital is exploited and consumed in our economies. The physical conditions in nature change and create instability. New life forms that are better fitted to these new conditions will appear, i.e. survival of the fittest. Some of these new organisms will not support present higher forms of life, e.g. homo sapiens. We see this as new diseases. The bird flu virus is just but one example of an ongoing creation of new organisms that will go on as long as suitable conditions are offered. Thus, present industrial society is fertilizing its own extinction. The only solution to sustainable development for humankind is to restore and preserve natures capital. This enforces a new paradigm based on increasing the capital of nature instead of exploiting it. Present technology and social management are founded, to a large extent, on the knowledge offered by science. Yet it is precisely these structures and their impact, which we know to be unsustainable. This implies tremendous efforts from science, which gradually adopts the new situation. In some areas of science this even relates to a complete change of paradigm. Science is partly the problem as well as a part of the solution for a sustainable development.

The evolution of knowledge is essential to human cultures. Every human culture carries a unique cultural paradigmthe soil for knowledge to grow and flourish. The diversity of cultures in our world is essential to the evolution of human knowledgeour creative diversity. This diversity is the wellspring of our progress and creativity.

Present focus must be on relationships; between humans and with nature. Today these relationships are characterized by greed and violence fostered by the present cultural paradigm, or arrogance and ignorance instead of friendship and compassion. This must change into a culture of peace. Peace within us, peace among us and peace with nature are essential for happiness, harmony and knowledge to flourish.

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We, the people of the world, are also children of earth with a common goal to care for life itself. We were given intelligence, emotions and possibilities, but also responsibilities. With these gifts we have created a world of prosperity, but also of poverty. The world has brought us together, but also apart and away from nature. We face a future of threats and limitations, but also possibilities. These challenges demand careful and responsible actions from everyone, based on a better understanding together with moral obligations.

Natures Engineering

Nature is the only creature and holder of life, as far as we know. From our understanding there are some fundamental conditions that maintain this unique capacity of nature.

Contrast, Motion, Exergy, and Time

In order for things to happen, i.e. motion to occur, there must be a driving force: something that can create action. A force is created by a difference in space of some kind, i.e. a contrast. This is a physical quantity such as temperature, pressure or tension. When this force, due to a contrast, is acting, it also eats up its source of power. The depletion of power into action is the creator of time. By allowing a contrast that is enclosed into the three-dimensional space to act, a new fourth dimension is created, i.e. time.

Exergy is the physical concept of contrast, which quantifies its power of action. A system in complete equilibrium with itself and the environment does not have any exergy, i.e. no power of action. Exergy is defined as work, i.e. ordered motion, or ability to perform work. If there is exergy then time can be experienced, however, only if exergy is destroyed. This is an irreversible process, which creates a motion in a specific direction, i.e. in the direction of time.

The limited speed of light is also of essential importance for the life support systems. If light could move at infinite speed, the sun could, in principal, release all its stored exergy immediately, thus, there would be no time for life to appear. The light from other stars in the universe brings also with it the history, due to the limited speed of light. When we look into space, we look into the history of the universe. The border of the universe gives us its time of birth, or the so-called big bang, perhaps the birth of time. However, if the universe is infinite, then also time would be infinite.

Energy, Matter, Exergy, and Entropy

Energy and matter cannot be created, destroyed, produced or consumed. Energy and matter can only be converted into different forms. This occurs by the consumption of contrast. Locally, the contrast may increase, but this can only occur at the expense of an even greater deterioration of the contrast elsewhere. On the whole it is a question of continuous deterioration of contrast, thus, pointing out the existence and direction of time, see Fig. 1.

Energy and/or matter flow through a system. The motive force of the flow of energy and/or matter through the system is the contrast or the level of order. Energy and/or matter are falling from high order, i.e. low entropy, in the inflow into low order, i.e. high entropy, in the outflow. This is also expressed as a destruction of exergy [1].

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Fig. 1 The flow of energy and matter through a system.

Energy and matter only serve as carriers of contrast, which is partly consumed when it flows through a system. When energy and matter flow through a system, a very small part of this may sometimes be stored in or removed from the system. If there is a balance between inlets and outlets of energy and matter, the system will remain unchanged, a kind of steady state that is described in Fig. 1. Such steady state systems are the moon and a car. The moon offers us moonlight and a car is a mean of transport, however, the systems remain in principal unchanged.

If exergy is stored in the system we may have a viable state, i.e. life may occur. Logic would suggest therefore that the existence of life and the evolution of life imply that exergy from the sun must be stored on the earth.

The Earth, the Sun, and Space

Fig. 2 The sun-earth-space system.

The source of exergy on the earth is secured from the contrast between the sun and space, see Fig. 2. The exergy on the earth, exists through the conversion of energy from sunlight into heat radiation, which flows from the earth back into space. Due to this, all flows of energy and matter are carried forward through systems on the earths surface, and life can be created and maintained.

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Life

Life in nature relates to three fundamental processes: production, consumption, and decomposition. These maintain the circulation of matter by using the incoming solar exergy in a sustainable and evolutionary way, see Fig. 3.

Green plants, which represent the production process, convert exergy from sunlight into the exergy-rich matter of biomass, via photosynthesis. The exergy as biomass then passes through different food chains in the ecosystems. At every trophic level exergy is consumed and decomposition organisms dominate the last level in this food chain. There is no waste, however a removal of unwanted substances. Nature operates a unique machinery of development on the earth by capturing and sealing certain substances into minerals in the earths crust. A fraction of the exergy from the sun-space contrast is stored as an increase of the exergy capital on the earth. This appears as a net-flow of unwanted substances from the biosphere into the lithosphere as well as a redistribution of other substances in the environment, e.g. oxygen to the atmosphere. Thus, the exergy capital on the earth is increasing, which is a key element in natures process of evolution.

Societys Engineering

Resource Use in the Society

Present industrial society, is built on an unsustainable resource use, see Fig. 4. Fossil fuels and metals that originate from deposits of minerals in the lithosphere are unsealed and spread in the environment, which is exactly the opposite of what is done by nature (Fig. 3). This is obviously not sustainable, at least not for a very long time. Resource depletion and environmental destruction are two consequences of the use of deposits. In a closed system nothing disappears and everything disperses which state that these substances will unavoidably end up in the environment.

Fig. 3 The circulation of matter in nature is powered by sunlight.

Fig. 4 Society depletes natures capital and returns waste.

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In Fig. 5, we see how the resource use in the society is maintained. The greater part of the exergy requirements are utilized from the terrestrial exergy stocks, i.e. funds and deposits. Only a very small part of the exergy flow from the sun is used directly. Through society we see an almost continuous exergy loss. Some exergy flows, such as flows of metals, initially increase their exergy when passing through society. However, other flows decrease their exergy all the more. A tank, which contains the funds and the deposits, indicates the limited amount of exergy stocks or capital on the earth. As long as the levels are kept stable, i.e. the output of resources does not exceed the input from the sun and the biological processes, then we have a sustainable situation. However, if the level is dropping, i.e. the exergy capital is depleting then we have an unsustainable situation and substances will be contaminated in the environment. As long as these substances are under control this may not be a serious problem. Large amount of substances are accumulated in the society as constructions, e.g. buildings and machines, and, as long as these remain, their substances may not effect the environment. However, when they are allowed to decompose some of them may pose a serious threat, e.g. old nuclear, chemical, and biological arms that are not safely stored or destroyed. This also relates to harmful substances that are accumulated by a purification system, e.g. used filters and sediments from sewage treatment works, cyclone separators and scrubbers. However, human constructions and buildings will not last forever. Sooner or later they will deteriorate and their substances will end up in the environment. Thus, environmental pollution is an inevitable consequence of the use of deposits. The depletion of the resource may not be the most serious problem, but rather the emission of pollutant and unwanted substances into the environment. The concern for an eventual lack of non-renewable resources must be combined by a similar concern for the environmental impact and its consequences from the emission of these substances. Presently, only nature offers the machinery to put these substances back into the lithosphere (Fig. 3). However, the present damage may take nature millions of years to repair, and in the meantime there will be a serious impact on the living conditions for all forms of life.

Fig. 5 Exergy flows to the society.

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Fig. 6 Exergy use in the Swedish society in 1994.

Figure 6 shows the exergy flow in the society in more detail, in this case the main conversions of energy and materials in Sweden in 1994 [2]. The flows go from the resource base to the consumption sector. Thus, the diagram basically represents the resource supply sector where resources such as crops and minerals are turned into consumer goods such as food, transport and thermal comfort. The inflows are ordered according to their origins. Sunlight is thus a renewable natural flow. Besides a minor use of wind power, far less than 5 PJ, this is the only direct use of a renewable natural flow. Harvested forests, agricultural crops, and hydropower are renewable exergy flows derived from funds. Iron ore, nuclear fuels, and fossil fuels are flows from deposits, which are exhaustible and also carry with them toxic substances. The

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unfilled boxes represent exergy conversions, which in most cases represent a huge number of internal conversions and processes. The total inflow of resources during 1994 amounts to about 2720 PJ or 310 GJ per capita and the net output becomes 380 PJ or 40 GJ per capita. Thus, the overall efficiency of the supply sector can be estimated at less than 15%. As we can see, some sectors are extremely inefficient. Some resource conversion systems have a ridiculously poor efficiency. For nuclear fuel to space heating through short circuit heaters the utilization becomes less than 0.025% [2].

The emission of unwanted substances from the industrial society is likely to produce diverse and unpredictable consequences in the biosphere. New microorganisms adapted to new environments will appear, see Fig. 7. Existing microorganisms, i.e. bacteria, fungi and viruses, provide the conditions on which present forms of life are founded. All forms of life are built on the existence of a specified mixture of certain microorganisms.

Fig. 7 Survival of the Fittest is a driving force in the evolution .

The incredible power of these tiny organisms must not be ignored. One single bacterium could in theory fill out the entire solar system within a few weeks if it were able to multiply without limitations. This describes the power of the living foundation of natures life support system and the danger of interfering with this. By changing the physical environment it becomes unfavorable for existing microorganisms as well as for higher forms of life. This may be recorded as a reduction in the number of species. However, the new physical environment that is offered will also encourage new forms of life to appear, initially by new microorganisms that are better fitted to the new conditions, e.g. bacteria that develop immunity to antibiotics. Later new insects or insects with new characteristics will appear, such as the malaria mosquito that is resistant to DDT. This is what Darwin expresses as the survival of the fittest. Toxicity is a condition that can be reversed when transferred to different biological systems. A toxic substance is of course harmful for some organisms but at the same time it offers a new ecological niche that soon will be occupied by new organisms. This is a dangerous consequence of environmental pollution and an important perspective on the bird flu virus.

Thus, industrial society may nourish its own extinction by degrading the biological foundations of human existence. It would be very naive to believe that new microorganisms will only live in harmony with the present higher forms of life. The immediate signs of this are the appearance of new diseases as the bird flu virus, less resistance against existing diseases due to a weakened immune system and the increasing rate of chronic allergy.

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Sustainable Engineering

Sustainable Development

There are more than hundred definitions of sustainable development, however, the most widely-used was coined in 1987 by the Brundtland Commission in their report, Our Common Future: to meet the needs of the present without compromising the ability of future generations to meet their own needs. This may sound very attractive since everyone will get what they need, now and forever. However, this does not free the rich from dealing very concretely with the problems associated with redistribution of current wealth to those who are in greater need. Still, need must be treated with global justice to remain its meaning. United Nations Development Programme Human Development Report has stated that the annual income of the poorest 47 percent of the earths people is less than the combined assets of the richest 225 people in the world. Given this obscenely unequal distribution of wealth and income, the top fifth of the worlds people consume 86 percent of all the goods and services while the bottom one-fifth must subsist on a mere 1.3 percent. Sustainable development must not become a mantra used as an excuse and justification to sustain economic growth at the expense of continued human suffering and environmental destruction. Thus, it must incorporate explicit and well-founded notion of the globes carrying capacity and an awareness of the consequences of exceeding this. However, since the Brundtland report was presented, resource depletion and environment destruction have only proceeded and worsen. The poor are still ignored and left out with a catastrophe. Thus, the time of lip service must be replaced with action and true change. This implies the fulfillment of moral obligations concealed for generations.

Exergy is a suitable scientific concept in the work towards sustainable development. Exergy accounting of the use of energy and material resources provides important knowledge on how effective and balanced a society is in the matter of conserving natures capital. This knowledge can identify areas in which technical and other improvements should be undertaken, and indicate the priorities, which should be assigned to conservation measures. Thus, exergy concept and tools are essential to the creation of a new engineering paradigm towards sustainable development.

Exergy

The exergy concept originates from works of Carnot [3], Gibbs [4] Rant [5] and Tribus [6]. Exergy of a system is [1]

i

ii nSTVPUE 000 P (1)

where U, V, S, and ni denote extensive parameters of the system (energy, volume, entropy, and the number of moles of different chemical materials i) and P0, T0, and i0 are intensive parameters of the environment (pressure, temperature, and chemical potential). Analogously, the exergy of a flow can be written as:

0 0i iE H T S nP (2)

where H is the enthalpy.

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All processes involve the conversion and spending of exergy, thus high efficiency is of most importance. This implies that the exergy use is well managed and that effective tools are applied.

Exergy Losses

Energy is always in balance, however, for real processes exergy is never in balance due to irreversibilities, i.e. exergy destruction that is related to the entropy production by

tot tot totin out 0 in out( ) 0i

iE E T S E E ' ! (3)

where totS' is the total entropy increase, totinE is the total exergy input, totoutE is the total exergy

output, and iEE )( outin is the exergy destruction in process i.

The exergy loss, i.e. destruction and waste, indicates possible process improvements. In general tackle the biggest loss first approach is not always appropriate since every part of the system depends on each other, so that an improvement in one part may cause increased losses in other parts. As such, the total losses in the modified process may in fact be equal or even larger, than in the original process configuration. Also, the use of renewable and non-renewable resources must be considered. Therefore, the problem needs a more careful approach.

Exergy Efficiencies

A simple definition of efficiency expresses all exergy input as used exergy, and all exergy output as utilized exergy. So the exergy efficiency ex,1 becomes:

in

outin

in

outex,1 1 E

EEEE K (4)

However, this efficiency does not always provide an adequate characterization of the thermodynamic efficiency of processes, such as heat transfer, separation, expansion etc. Often, there exists a part of the output exergy that is unused, i.e. an exergy waste wasteE to the environment. Thus, the utilized exergy is given by wasteout EE , which we call the exergy product Epr . The output consists of two parts.

wasteprout EEE (5)

The exergy efficiency Kex,2 now instead becomes

in

wasteex,1

in

pr

in

wasteout2,ex E

EEE

EEE KK (6)

Sometimes a part of the exergy going through the system is unaffected. This part of the exergy has been named the transit exergy Etr, see Fig. 8. Example of transit exergy is the

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exergy which goes unaffected through a production process, e.g. the exergy of crude oil being refined into petroleum products.

Fig. 8 Process flows.

If the transit exergy Etr is deducted from both the input and the output exergy (or rather from exergy product), the exergy efficiency 3,exK becomes

trin

trpr

trin

trwasteout3,ex EE

EEEE

EEE

K (7)

These latter definitions are compared by applying them to a system with two different processes A and B (Fig. 9) The exergy efficiencies are for process A: ex,2=91% and ex,3=10%, and for process B: ex,2= ex,3=50%. Thus, determining which is the most efficient process is a matter of defining efficiency. In addition, the exergy destruction of process A is larger than that of process B, 9 versus 5.

Fig. 9 Comparing exergy efficiencies.

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A better insight is offered by using exergy flow diagrams since it shows: (1) the exergy efficiencies of the various parts of a system, (2) the different exergy inputs and outputs, (3) where the various exergy flows come from and go to, (4) the amount of transit exergy, (5) how much exergy is destroyed in each processes.

Exergy diagrams

Exergy flow diagrams

Fig. 10 Energy and exergy flow diagrams of a heat power plant.

From the above it is clear that ambiguity reduces if an exergy flow diagram is used to demonstrate an exergy transfer instead of a ratio. In engineering, these diagrams are often used to describe the energy or exergy flows through a process.

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Figure 10 shows a typical heat power plant, its main components and roughly the main energy and exergy flows of the plant. This diagram shows where the main energy and exergy losses occur in the process, and also whether exergy is destroyed from irreversibilities or whether it is emitted as waste to the environment. In the energy flow diagram energy is always conserved, the waste heat carries the largest amount of energy into the environment, far more than is carried by the exhaust gases. However, in the exergy flow diagram the temperature of the waste heat is close to ambient so the exergy becomes much less. The exergy of the exhaust gas and the waste heat are comparable.

Figure 11 illustrates the energy and exergy flows of an oil furnace, an electric heater, an electric heat pump and a combined power and heat plant, i.e. a co-generation plant. The produced heat is used for space heating. In the oil furnace the energy efficiency is assumed to be typically about 85%, losses being due mainly to the hot exhaust gases. The exergy efficiency is very low, about 4%, because the temperature difference is not utilized when the temperature is decreased, to a low of about 20C, as a comfortable indoor climate.

Fig. 11 Energy and exergy flows through some typical energy systems.

Electric heating by short-circuiting in electric resistors has an energy efficiency of 100%, by definition of energy conservation. The energy efficiency of an electric heat pump is not limited to 100%. If the heat originating from the environment is ignored in the calculation of the efficiency, the conversion of electrical energy into indoor heat can be well over 100%, e.g. 300% as in Fig. 11. The exergy flow diagram of the heat pump looks quite different. The exergy efficiency for an electric heater is about 5% and for the heat pump, 15%.

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In Fig. 10 the energy and exergy efficiencies are the same because the inflow of fuels and the outflow of electricity both have an exergy factor of about or exactly 1 respectively. For a combined power and heat plant, i.e. a cogeneration plant (Fig. 11) the exergy efficiency is about the same as for a thermal power plant (Fig. 10). This can be better understood from the exergy diagrams. The main exergy loss occurs in the conversion of fuel into heat in the boiler. Since this conversion is practically the same in both the condensing and the combined power plants, the total exergy efficiency will be the same, i.e. about 40%. However, it may be noted that the power that is instead converted into heat corresponds to a heat pump with a coefficient of performance (COP) of about 10. Thus, if there is a heating need a cogeneration plant is far superior to a condensing power plant. The maximum energy efficiency of an ideal conversion process may be over 100%, depending on the definition of efficiency. The exergy efficiency, however, can never exceed 100%.

Total Exergy input/output Analysis

Exergy Analysis

To estimate the total exergy input that is used in a production process it is necessary to take all the different inflows of exergy to the process into account. This type of budgeting is often termed Exergy Analysis [1]. There are basically three different methods used to perform an Exergy Analysis: a process analysis, a statistical analysis or an input-output analysis. The latter is based on an input-output table as a matrix representation of an economy. Every industrial sector is represented by a row and column in the matrix. The main advantage of this method is that it can quickly provide a comprehensive analysis of an entire economy. The main disadvantages results from the use of financial statistics and from the degree of aggregation in the table. In order to obtain a more detailed disaggregation than used in input-output tables it may be sufficient to make use of the more detailed statistics from which input-output tables are usually compiled. The method is called statistical analysis, which is basically a longhand version of input-output analysis. This method has two advantages over the input-

output method: firstly, it can achieve a more detailed analysis, and secondly, it can usually be executed directly in physical units, thus avoiding errors due to pre-ferential pricing, price fluctua-tions, etc. How-ever, its dis-advantage com-pared to the

input-output method is that the computations usually have to be done manually. Process analysis, see Fig. 12, focuses on a particular process or sequence of processes for making a specific final commodity. It evaluates the total exergy use by summing the contributions from all the individual inputs, in a more or less detailed description of the production chain.

Fig. 12 Levels of an exergy process analysis.

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Net Exergy Analysis has also been introduced, see Fig. 13. All exergy being used, directly or indirectly, in the production of the product will be deducted from the exergy of the product, in order to define the net exergy product.

Life Cycle Analysis or Assessment

Environmentally oriented Life Cycle Analysis or Assessment (LCA) has become very popular in the last decade to analyze environmental problems associated with the production, use and disposal or recycling of products or product systems, see Fig. 14. Every product is assumed to be divided into these three life processes, or as it is sometimes named from cradle to grave.

Fig. 14 The life cycle from cradle to grave.

For every life process the total inflow and outflow of energy and material is computed, thus, LCA is similar to Exergy Analysis. In general Exergy Analysis and LCA have been developed separately even though they are strongly linked. This inventory of energy and material balances is then put into a framework as described in Fig. 15. Four stages in the LCA can be distinguished: (1) Aims and limits, (2) Inventory, (3) Environmental impact, and (4) Measures. These four main parts of an LCA are indicated by boxes, and the procedure is shown by arrows. Solid arrows show the basic steps and dashed arrows indicates suitable next steps, in order to further improve the analysis.

Fig. 13 Net exergy analysis.

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In LCA the environ-mental burdens are associated with a product, process, or activity by identifying and quantifying energy and materials used, and wastes released to the environment. Secondly one must assess the impact on the environment, of those energy and material uses and releases. Thus it is divided into several steps (Fig. 15).

Life Cycle Exergy Analysis

The multidimensional approach of LCA causes large problems when it comes to comparing different substances, and general agreements are crucial. This problem is avoided if exergy is used as a common quantity, which is done in Life Cycle Exergy Analysis (LCEA) [2].

Fig. 16 LCEA of a fossil fueled power plant.

In this method we distinguish between renewable and non renewable resources. The total exergy use over time is also considered. These kinds of analyses are of importance in order to develop sustainable supply systems of exergy in society. The exergy flow through a supply

Fig. 15 Main steps of an LCA.

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system, such as a power plant, usually consists of three separate stages over time (Fig. 16). At first, we have the construction stage where exergy is used to build a plant and put it into operation. During this time, 0 d t d tstart , exergy is spent of which some is accumulated or stored in materials, e.g. in metals etc. Secondly we have the maintenance of the system during time of operation, and finally the clean up stage. These time periods are analogous to the three steps of the life cycle of a product in an LCA. The exergy input used for construction, maintenance and clean up we call indirect exergy Eindirect and we assume this originates from non renewable resources. When a power plant is put into operation, it starts to deliver a product, e.g. electricity with exergy power prE , by converting the direct exergy power input

inE into demanded energy forms, e.g. electricity. In Fig. 16 the direct exergy is a non-renewable resource, e.g. fossil fuel and in Fig. 17 the direct exergy is a renewable resource, e.g. wind.

Fig. 17 LCEA of a wind power plant.

In the first case, the system is not sustainable, since we use exergy originating from a non-sustainable resource. We will never reach a situation where the total exergy input will be paid back, simply because the situation is powered by a depletion of resources, we have

indirectinpr EEE . In the second case, instead, at time paybacktt the produced exergy that originates from a natural flow has compensated for the indirect exergy input, see Fig. 17, i.e.

indirect0

indirectpr

lifebackpay

start

)()( EdttEdttEtt

t (8)

Since the exergy input originates from a renewable resource we may not account for it. By regarding renewable resources as free then after paybacktt there will be a net exergy output from the plant, which will continue until it is closed down, at closett . Then, exergy has to be used to clean up and restore the environment, which accounts for the last part of the indirect exergy input, i.e., Eindirect , which is already accounted for (Eq. 8). By considering the total life cycle of the plant the net produced exergy becomes net,pr pr indirectE E E . These areas representing exergies are indicated in Fig. 17. Assume that, at time t=0, the production of a wind power plant starts and at time starttt it is completed and put into operation. At that time, a large amount of exergy has been used in the construction of the plant, which is indicated by the area of Eindirect between t=0 and starttt . Then the plant starts to produce electricity, which is indicated in Fig. 17 by the upper curve prnet,indirectpr EEE . At paybacktt the exergy used for construction, maintenance and clean up has been paid back. For modern

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wind power plants this time is only some months. Then the system has a net output of exergy until it is closed down, which for a wind power station may last for decades. Thus, these diagrams could be used to show if a power supply system is sustainable.

LCEA is very important in the design of sustainable systems, especially in the design of renewable energy systems. Take a solar panel, made of mainly aluminum and glass, that is used for the production of hot water for household use, i.e. about 60C. Then, it is not obvious that the exergy being spent in the production of this unit ever will be paid back during its use, i.e., it might be a misuse of resources rather than a sustainable resource use. The production of aluminum and glass require a lot of exergy as electricity and high temperature heat or several hundred degrees Celsius, whereas the solar panel delivers small amounts of exergy as low temperature heat. LCEA must therefore be carried out as a natural part of the design of sustainable systems in order to avoid this kind of misuse. Another case to investigate is the production of biofuels in order to replace fossil fuels in the transport sector. This may not necessarily be sustainable since the production process uses a large amount of fossil fuels. Thus, it may well turn out to be better to use the fossil fuels in the transport sector directly instead.

Sustainable engineering could be defined as systems which make use of renewable resources in such a way that the input of non-renewable resources will be paid back during its life time, i.e. indirectinpr EEE ! . In order to be truly sustainable the used deposits must also be completely restored or, even better, not used at all. Thus, by using LCEA and distinguishing between renewable and non-renewable resources we have an operational method to define sustainable engineering.

Exergy and economics

Exergy measures the physical value of a natural resource. Thus, it is also related to the economic value, which reflects the usefulness or utility of a resource.

In order to encourage the use of sustainable resources and to improve resource use, an exergy tax could be introduced. The use of non-renewable resources and its waste should be taxed by the amount of exergy it accounts for, since this is related to the environmental impact. In addition to this, toxicity and other indirect environmental effects must also be considered. In the case of irreversible environmental damage, a tax is not suitable, instead restrictions must be considered.

A system could be regarded as a part of two different environments, the physical and the economic environment. The physical environment is described by pressure P0, temperature T0, and a set of chemical potentials i0 of the appropriate substances i, and the economic environment by a set of reference prices of goods and interest rates. These two environments are connected by cost relations, i.e. cost as a function of physical quantities (Fig. 18).

With the system embedded in the physical environment, for each component there are mass and energy balances needed to define the performance of the system. In addition, these balances describe the physical behavior of the system.

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Fig. 18 The system surrounded by the physical and the economical environments, which are linked through cost relations.

If the cost relations are known, then the physical and economic environments could be linked. The cost equations can sometimes be simplified to a scale effect, times a penalty of intensity. Then the system of lowest cost, which is physically feasible, can be found. Usually the maintenance and capital costs of the equipment are not linear functions, so in many cases these costs have more complex forms. If, by some reason, it is not possible to optimize the system, then at least cost could be linked to exergy by assuming a price of exergy. This method is called Exergy Economy Accounting (EEA).

Exergy Economy Accounting

Since exergy measures the physical value, and costs should only be assigned to commodities of value, exergy is thus a rational basis for assigning costs, both to the interactions that a physical system experiences with its surroundings and to the sources of inefficiency within it. The exergy input is shared between the product, and the losses, i.e. destruction and waste.

EEA simply means determining the exergy flows and assigning economic value to them. When there are various inflows and outflows, the prices may vary. If the price per exergy unit does not vary too much, an average price can be defined. This method allows comparison of the economic cost of the exergy losses of a system. Monetary balances are formulated for the total system, and for each component of the system, being investigated. EEA gives a good picture of the monetary flows inside the total system and is an easy way to analyze and evaluate very complex installations.

EEA does not, however, include consideration of internal system effects. It does not describe how the capital investments in one part on the system affect exergy losses in other parts of the system. In the EEA method the exergy losses are numbers and not functions. However, this simple type of analysis sometimes gives ideas for, otherwise, not obvious improvements, and a good start of an optimization procedure, in which the exergy losses would be functions.

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Exergy Economy Optimization

When constructing a system, the goal is often to attain the highest possible technical efficiency at the lowest cost, within the existing technical, economical and legal constrains. The analysis also includes different operating points (temperatures, pressures, etc.), configurations (components, flow charts, etc.), purpose (dual purpose, use of waste streams, etc.), and environments (global or local environment, new prices, etc.). Usually, the design and operation of systems have many solutions, sometimes an infinite number. By optimizing the total system, the best system under the given conditions is found. Some of the general engineering optimization methods could be applied, in order to optimize specific design and operation aspects of a system. However, selecting the best solution among the entire set requires engineering judgment, intuition and critical analysis. Exergy Economy Optimization (EEO) is a method that considers how the capital investments in one part of the system affect other parts of the system, thus optimizing the objective function. The marginal cost of exergy for all parts of the system may also be calculated to find where exergy improvements are best paid off.

Optimization, in a general sense, involves the determination of a highest or lowest value over some range. In engineering we usually consider economic optimization, which in general means minimizing the cost of a given process or product, i.e. we need a well defined objective function. It is also important not to be misled by a local optimum, which may occur for strongly non linear relations. It is only the global optimum that truly optimizes the objective function.

Conclusions

From a sustainable development point of view, present industrial resource use is a dead-end technology, leading to nothing but resource depletion and environmental destruction in the long run. The exergy capital is used and become waste in a one-way flow (Fig. 4). Instead we need to develop a vital and sustainable society, similar to what is practiced by nature.

Nature has so far generated life and awareness by means of natural evolution. Present social evolution is instead governed by increased wealth in terms of money, often indicated by Gross Domestic Production (GDP). This is when asphalt, smokestacks and color TVs replace rain forests, or when rice fields, cultivated for more than 5000 years, are converted to golf courses. This myth of progress must be questioned if we are serious in our efforts for sustainable development. At first we must find the roots to the problem. The reason for our failure is a consequence of our deep-rooted weakness of building empires. The so-called human civilizations appearing some 10,000 years ago may be characterized as the beginning of an empire builder era of humankind. This empire building era must come to an end in order to reestablish a sustainable development. Then, we must work for a change through education, true actions, practical exercises, and precaution. Finally we must secure a guidance based on morals and responsibility.

Exergy is an excellent concept to describe the use of energy and material resources in the society and in the environment. A society that consumes the exergy resources at a faster rate than they are renewed is not sustainable. From the description of the conditions of the present industrial society, we may conclude that this culture is not sustainable. One may argue about

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details, such as how or when, but not that a culture based on resource depletion and environmental destruction is doomed. The educational system has a crucial role to play to meet this change towards sustainable development. This must be based on a true understanding of our physical conditions. Exergy is a concept that offers a physical description of the life support systems as well as a better understanding of the use of energy and other resources in society. Thus, exergy and descriptions based on exergy are essential for our knowledge towards sustainable development.

Time to turn is here. Time to learn and time to unlearn has come. Education must practice true democracy and morals to enrich creativity and knowledge by means of joy in learning. Culture of peace must replace cultures of empire building, violence and fear. The torch of enlightenment and wisdom carried through the human history must be shared within a spirit of friendship and peace.

Acknowledgement

The permission to use my work for the UNESCOs Encyclopedia of Life Support Systems (www.eolss.net) for this paper is hereby gratefully acknowledged. I also want to express my gratitude to the organizers of this conference to invite me to have this presentation.

References

1 Wall, G. Exergy a Useful Concept. Ph.D. Thesis, 1986, Chalmers University of Technology, Sweden, http://www.exergy.se/goran/thesis/index.html.

2 Gong, M. and Wall, G. On Exergy and Sustainable Development Part 2: Indicators and methods. Exergy, an International Journal, 2001, 1(4), 217-233.

3 Carnot, S. Rflections sur la puisance motrice du feu et sur les machines propres a dvelopper cette puissance (Ed R. Fox), 1978 (Bachelier, Paris).

4 Gibbs, J.W. A Method of Geometrical Representation of the Thermodynamic Properties of Substances by Means of Surfaces. Trans. Conn. Acad., 1873, II, 382-404.

5 Rant, Z. Exergie, ein neues Wort fr technische Arbeitsfhigkeit. (Exergy, a New Word for Technical Available Work). Forschungen im Ingenieurwesen, 1956, 22(1), 36-37.

6 Tribus, M. Thermostatics and Thermodynamics, 1961 (Van Norstrand, New York).

24

THE EU RESEARCH STRATEGY TOWARDS ZERO EMISSION FOSSIL FUEL POWER PLANTS

Pierre Dechamps European Commission

Directorate General for research Energy Conversion and Transport Unit

Brussels Belgium e-mail : pierre.dechamps@ec.europa.eu

Abstract

This paper describes the research strategy put in place by the Directorate General for Research of the European Commission in the field of the mitigation of CO2 emissions. This is first placed in the general context of the Commission energy policies. This section covers the main policy actions and instruments relevant to energy policy, that is namely the climate change issue, the introduction of renewable energy sources, the security of energy supply, the promotion of energy efficiency and the opening of energy markets. The paper then concentrates on the research policies of the Commission, mainly the European Research Area concept and its number one instrument, the Framework Programmes for research and technological development. The rational and the analysis supporting the ERA are covered, as well as the structure and the implementation modalities of the Framework Programmes. Initial ideas for the 7th framework programme covering the years 2006-2013 are debated. The paper then goes into some details of past and present projects in CO2 capture and sequestration and shows how they are organised and how they fit into the above-mentioned research policy, while contributing to the successful deployment of the Commission energy policies. These projects represent a portfolio of the order of 130 m of research and technological development. Emphasis is put on the new integrated projects and networks of excellence resulting from the calls for proposal of FP6 in this field. The new technology platform on zero emission fossil fuel power plants is presented, in its organisation, working methods, objectives and achievements mainly its vision and the corresponding strategic research agenda and strategic deployment agenda.

Keywords : European Commission, research, energy, fossil fuels, CO2

Introduction

Sustainable development and world-class economic competitiveness are central objectives for the European Union. These overriding needs are reflected in the European Unions research priorities in order to implement sustainable development, with energy as a key aspect. Three key strategic objectives for energy are:

to reduce greenhouse gas and pollutant emissions, to secure a future sustainable and diversified energy supply, with the increased use of

new and renewable energy sources to ensure a competitive European industry

In order to achieve an impact in the medium to long term, considerable RTD effort is required to implement a sustainable energy system with clean energy sources, carriers and conversion technologies that are economically attractive and technically robust. Within this scenario, fossil fuel use will be required to fulfil a long-term transitional role prior to the increasing introduction of new and renewable energy sources. However, if fossil fuels are to be part of

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this sustainable energy scenario, then near-zero emissions fossil fuel systems will be required. Accordingly, the development of CO2 capture and sequestration systems associated with fossil fuel power plants is a key priority within the RTD Framework Programmes of the European Union (EU).

Within the context of global environmental policy issues and initiatives, this paper provides an overview of such RTD activities together with comments on the complementary international cooperation and coordination actions by the EC.

Global Environmental Policy Issues

Worldwide, there is increasing concern regarding climate change issues related to Green House Gas (GHG) emissions. It is also recognised that global issues require global responses. This approach has been reflected in the Kyoto Protocol, with many major nations agreeing to limit greenhouse gas emissions in the period up to 2012. Thus the European Union intends to decrease its GHG emissions by 8% in 2008-2012 compared to 1990 under the Kyoto Protocol. This will be achieved through a burden sharing agreement between Member States taking into account the fuel mix and situation pertaining within each State. The EU is making reasonable progress so far, although there is still uncertainty on whether a reduction by 8% will be achieved in the designated timescale. Entry into force of the Protocol is subject to the ratification by countries representing at least 55% of total CO2 emissions. After the US withdrawal, this means that Russia should ratify and thus has in effect the future of the Protocol in its hands.

The European Climate Change Programme (ECCP) was also established to identify the most promising and cost-effective routes. With regard to the practicalities of reducing GHG emissions, this will be achieved through a combination of the more rational use of energy in all sectors together with a switch to lower carbon fuels including a greater introduction of (zero carbon) renewable energy sources. A second phase of the ECCP has started in early 2006, has a working group on carbon dioxide capture and storage and will give birth to a Commission Communication to the Council and the Parliament on carbon dioxide capture and storage.

Indeed at the Johannesburg World Summit on sustainable development, it was reaffirmed that increasing the use of clean renewable energy will have multiple benefits for developed and developing countries alike, with a positive outcome likely to arise from increasing the global share of renewable energy sources. However, as is noted below, the use of fossil fuels will continue to dominate the energy mix for a variety of reasons and as such there is a need to ensure that fossil fuel systems become more energy efficient and have a less adverse environmental impact.

For fossil fuel utilisation systems, the drive will be towards near zero emission power plant and for such units the currently proposed way forward is to introduce CO2 Capture and Sequestration techniques with the existing systems. Such techniques are not yet cost effective in the Kyoto horizon, but the results so far are promising. Thus, further RTD is worthwhile. Mitigation costs are high although they vary according to the technology to be used and even within the same technology there may be differences in costs (1), as shown in Figure 1.

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050

100

150

200

250

300

0 50 100 150 200 250 300 350 400 450 500CO2 reductions (Mt)

Miti

gatio

n cost (

/ton

CO

2)

RES RES

RES

CHPCHP

CHP

Fuelswitch Efficiency CO2 C+S

Figure 1: Cost effectiveness of CO2 reduction technology (source: ECCP)

With regard to GHG, since the 1st of January 2005, mandatory emissions limits are placed on all big industrial and energy intensive businesses on a continent-wide scale. The EU-wide emissions trading scheme is tailored to suit the Kyoto Protocol. This draws in five industry sectors across 25 EU Member States and the three EEA States (Iceland, Lichtenstein and Norway). The scheme covers power generation over 20 MW, including industrial installations, such as refineries, coke ovens, cement, metals, minerals and the pulp and paper industries (but not the chemicals sector) except for hazardous or municipal waste burners. A Linking Directive has been developed to bring CDMs and Joint Initiatives credits within the emissions trading umbrella.

For CO2 capture and sequestration, it is deemed essential that the use of such technologies can receive credits in the context of these two directives. It would appear that this should be the case since neither directive refers to any particular technology while defining emissions as releases to atmosphere. However, the position needs to be clarified and in particular, guidelines are required for the storage. About half of the EUs total CO2 emissions are covered by the scheme, with 5,000 firms taking part. It covers all greenhouse gases but only CO2 will be traded in the first instance as it accounts for 80% of emissions in the EU. The other gases will be traded from 2008 onwards when the scheme will be extended to other sectors and chemicals will almost certainly be brought in.

In the post-Kyoto scenario, more significant reductions of CO2 will be needed. On the basis of current climate models, it has been suggested that a maximum 2C increase in global temperatures could be accommodated, which would equate to an atmospheric CO2concentration level of some 450 ppmv. On the basis of 1990 levels this would require 50% to 60 % less emissions of CO2 by 2050 and a path going through -20 to -30% by 2020, as recently approved by the Council. This would need to come not only from developed economies but also from economies in transition since in the latter case even if per capita

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emissions are relatively low, total emissions will become ever more significant. Any post-Kyoto negotiation process will need to recognise the right to development of less developed and transitional economies.

International Projections and Comparisons for Energy Use

Following on from the previous point, various scenarios and projections have been made. A key study is the so called WETO Report (2), supported by the EU, which examined the world energy, technology and climate policy outlook in order to provide assistance to decision makers in defining their long term policies. Two of the key results arising from this work are as follows:

If no specific policy initiatives and measures are taken, world CO2 emissions are expected to double by 2030 and, with a share of 90%, fossil fuels will continue to dominate the energy system.

As the largest growing energy demand and CO2 emissions originate from developing countries, Europe will have to intensify its cooperation, particularly in terms of technology transfer.

The former point is shown in Figure 2, taken from the WETO study (2). Complementary work by the IEA (3) also indicates that on a global scale, coal demand for power generation is expected to double over the period to 2030, with the major increase arising within economies in transition. The IEA estimates that 4500 GW of new power plant will be required, of which coal fired plant is expected to be 40% of this with natural gas providing the very great of the remaining capacity. These projections arise from the recognition that the use of renewables can only be accelerated in the medium to long term both in developed and developing countries.

0300060009000

120001500018000

1980 1990 2000 2010 2020 2030

Mto

e

Coal, lignite Oil Natural gasPrim. Electricity Wood and wastes

Figure 2: Scenarios and projections fuels (source : WETO)

With regard to carbon intensity compared to GDP, the WETO report indicates that the EU is amongst the lowest, as shown in Figure 3.

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0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

World EuropeanUnion

NorthAmerica

LatinAmerica

Africa,MiddleEast

CIS, CEEC Asia Japan,Pacific

kgCO

2/

99

1990 2000 2010 2030

Figure 3: Scenarios and projections (source : WETO) - Carbon intensity of GDP

There are also scenarios and projections for CO2 emissions per capita. Here, the EU is above the world average but below some other continents, as shown in Figure 4

0

5

10

15

20

World EuropeanUnion

NorthAmerica

LatinAmerica

Africa,MiddleEast

CIS, CEEC Asia Japan,Pacific

tCO

2/ca

p

1990 2000 2010 2030

Figure 4: Scenarios and projections (source : WETO) - CO2 emissions per capita

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Key Energy Considerations within the EU

Within the European vision of energy sustainability, key issues include the need for security of energy supply and the need to ensure EU industrial competitiveness in a post Kyoto scenario. These key issues must also be reconciled with environmental protection.

Thus, in this context, within Europe, the EC Green Paper (4) identifies the need to establish a sustainable approach to energy use and management. There is a focus on ensuring diversity of supply while meeting environmental standards and limits through increased use of indigenous renewable energy sources. At the same time, the Green Paper explicitly recognises that doubling the renewables share in the energy supply quota from 6 to 12% and raising their part in electricity production from 14 to 22% is an ambitious objective. Indeed a prevailing view amongst EU energy experts is that the future energy needs of the enlarged EU will require the full range of available fuels (including renewables, nuclear, natural gas, oil and coal) to be utilised on an environmentally acceptable basis to meet the projected overall needs. Such an approach is considered sustain