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http://slidepdf.com/reader/full/13mmed01 1/17

Presented by: Desai Vatsal N.13MMED01

Institute Guide:Prof. Darshita J. ShahMechanical DepartmentNirma University

Industry Guide:Mr.Avinash VermaHead Of EngineeringCHEM Process Sys.

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Basics of closed feed water heatersMotivationObjectivesLiterature Review

Design CalculationsWork PlanReferences

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Terminology:-

A feedwater heater is a heat exchanger designed to preheat boiler feedwaterby means of condensing steam extracted (or “bled”) from a steam turbine.

Conf

iguration:-General configuration of FWHs is shell and tube type heat exchangeremploying U-Tubes.

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Pressure Classification:-Low Pressure Heater: The feedwater leaving LP heater isgenerally about 1.4 MPa and 80°C to 100°C.High Pressure Heater: The feedwater leaving HP heater isgenerally about 4-7 MPa and around 170°C.Zones:-

Zones are separate areas within the shell in a feedwater heater.(i) Condensing (ii) Drain cooling (iii) Desuperheating

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To increase the efficiency of Turbine cycle regenerative heating is employed usiFeedwater heaters.

Need of Design and Analysis of current HP heater:

Design by Analysis.

Previous Heater

Pressure Temperature

Shell side/Tube side Shell side/Tube side

13 bar / 112.8 bar 170°C / 180°C

Current Heater


Shell side/Tube side Shell side/Tube

14.51 bar / 183.4 bar 200°C / 200°C

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Design:-Mechanical Design of all the components using ASME Section VIII Div. I and validation of design using COMPRESS software.Process Design using HTRI software.

Analysis:-By Analytical method using ASME Section VIII Div. II.By FEA tools for,

(i) Different HEI end closures.(ii) Tubesheet structure.(iii)Tube to Tubesheet juncture.

Improvement in the design if required after FEA .

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Sr. No. Name of Author Title of ResearchPaper/Article

Remarks

1 Irfan S Hussaini Area allocation on multizonefeedwater heater

The paper presents numethod of analyzing csystem feedwater hea

2 Yuh Ming Ferng Prediction of possible wear siteson the shell wall of feedwaterheater due to dropletimpingement using CFD models

The paper proposes toEulerian/Lagrangian dflow model and the drimpingement erosion for prediction of wearshell wall of FWH

3 Kyeong Mo Hwang A study on the shell wallthinning causes identifiedthrough experiment, numericalanalysis & ultrasonic test of highpressure feedwater heater

This paper compares rfrom numerical analyFluent code and experdata to find the root cshell wall thinning in FWH

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Sr. No. Name of Author Title of Research Paper/Article Remarks

4

Mario Álvarez-Fernández Thermal analysis of closedfeedwater heaters in nuclearpower plants

The paper proposes amodel and carries outcalculations and analyof closed feed waterheater .

5 MuhammadMahmood AslamBhutta

CFD applications in various heatexchangers design: A review

The paper is a review CFD analysis employefor analyses of variouheat exchangercomponents

6 Alwyn S. Tooth An alternative way to supporthorizontal pressure vesselssubject tothermal loading

The paper gives thebackground to the usethe nonsliding suppor vessels where thermalexpansion is known tooccur.

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Sr. No. Name of Author Title of Research Paper/Article Remarks

7 A. N. Shuaib Residual Stresses in RollerExpanded Tube-Tubesheet JointsWith Large Initial Clearance andGrooves

This paper employs anaxisymmetric finiteelement model has beeused to evaluate theeffect of large initial tutubesheet radialclearance .

8 C. F. Qian Finite Element Analysis and

Experimental Investigation of Tubesheet Structure

The paper establishes

two different FE modefor tubesheets andcompares the results

9 N. Merah Finite element evaluation ofclearance effect ontube-to-tubesheet joint strength

The paper employs Finelement method toanalyse tube to tubesheet joint in a stabilizfeed heat exchanger

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Design Data:-

Q= Flow Rate A= Heat Transfer area V= Tube side VelocityN= no. of tubesP= pitchr= Density

Current Heater


Flow No. ofpasses

Tubelengthrange

Tubeouterdiameter range

Shellside/Tube side

Shellside/Tube side

Tubeside

2 7900-8500mm

16-21mm

14.51bar /

183.4bar

200°C /200°C

205200kg/hr

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Q= r AV

205200 = 1000* A*1.62

A=126.66 m2

No. of passes =2

Therefore A= 253.32 m2

No. of Tubes= A/ p* d0 * L

=628

Cross-Sectional Area = No. of Tube* P 2

=628 * 23

= 332212mm2

Safe Circle Diameter = (tubed area * Factor * 4/ p )0.5

= 682.11 mm

Shell Inner Diameter = Safe Circle Diameter + Tube O.D. + Bundle clearance

= 682.11+17+110

=810 mm

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WORK PLAN

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Books:-Structural Analysis and Design of Process Equipment by James Farr and Maan Jawad.

Pressure Vessel Design Manual by Dennis R. Moss.

Mechanical Design of Heat Exchangers and Pressure Vessel Technology by K.P.Singh

Heat Exchanger Design Handbook by T. Kuppan.

Fundamentals of Heat Exchangers by R.K.Shah.

Codes:- ASME BPV 2013 Section VIII Div.I

ASME BPV 2013 Section VIII Div.II.TEMA

Research Papers:-Irfan S Hussaini ,Area allocation on multizone feedwater heater.

Yuh Ming Ferng, Prediction of possible wear sites on the shell wall of feedwater heaterdue to droplet impingement using CFD models .

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Kyeong Mo Hwang, A study on the shell wall thinning causes identified throughexperiment, numerical analysis & ultrasonic test of high pressure feedwaterheater.

Mario Álvarez-Fernández, Thermal analysis of closed feedwater heaters innuclear power plants.

Muhammad Mahmood Aslam Bhutta , CFD applications in various heatexchangers design: A review. Alwyn S. Tooth , An alternative way to support horizontal pressure vesselssubject to thermal loading.

A. N. Shuaib , Residual Stresses in Roller Expanded Tube-Tubesheet Joints WithLarge Initial Clearance and Grooves.

C. F. Qian , Finite Element Analysis and Experimental Investigation of TubesheetStructure.

N. Merah , Finite element evaluation of clearance effect on tube-to-tubesheet joint strength.

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