Mississippi PowerKemper County IGCC Plant

2008 Southern Section A&WMA Annual Meeting and Technical Conference

Scott McMillanSouthern Company Services

Keith BenvenuttiMississippi Power Company

IGCC

• IGCC stands for “Integrated Gasification Combined Cycle”

• IGCC is a combined-cycle power plant and a coal-gasification plant designed specifically to work with each other.

• There are currently only two coal based IGCC plants in the U.S.

IGCC

Gasification• Fuel (i.e. coal, petcoke, biomass, etc.) is introduced into a “Gasifier”

• The fuel is subjected to high temperature and pressure with limited air (or oxygen)

• Chemical reaction resulting in the formation of a synthesis gas or “syngas”

• Gasification is not combustion

• Commercially proven technology

IGCC

Syngas• Combustible gas typically consisting of mostly CO and H2

• Heating value generally between 125 and 275 BTU/ft3 (Natural Gas = 1,000 BTU/ft3)

• Capability to remove particulate, nitrogenous compounds, sulfur, and mercury from syngas prior to its end use

IGCC

Combined Cycle Power Generation• Power is generated by combusting fuel (natural gas, fuel oil, syngas, etc.) in a Combustion Turbine

• Very hot exhaust gas from the turbine discharges to a Heat Recovery Steam Generator (HRSG)

• Steam raised in the HRSG is expanded through a Steam Turbine which generates additional power

• Very efficient method of power generation

IGCC

Advantages of IGCC• Fuel diversity – Potentially wide range of feed stocks

• More efficient than traditional pulverized coal technology

• Improved NOX, SO2 and Mercury removal than traditional pulverized coal technology

• Lower CO2 than traditional pulverized coal technology, with greater potential for future CO2 capture

• Marketable byproducts

Power Systems Development Facility (Wilsonville, AL)

“America’s Advanced Coal Research Center”

http://psdf.southernco.com

• Established in 1996

• Supports DOE’s effort to develop cost-competitive and environmentally acceptable coal-based power generation technologies

• Designed at a size that can be reliably scaled up to commercial applications

• Development of the Transport Gasifier

PSDF

Current Cost Share Partners

• US DOE- National Energy Technology Laboratory (NETL)

• Southern Company• Electric Power Research Institute (EPRI)• KBR• Peabody Energy• Lignite Energy Council

PSDF

Transport Gasifier Attributes / Features

• Performs well on low rank & high ash/high moisture coals

• Simple Design:

– Operates air-blown for power generation

– No burners, Simple and limited internal parts

• Low operating temperature

• The Transport Gasifier at the PSDF has operated for 16,500 hours with >13,200 hours on-coal and >8,200 hours in gasification mode

DisengagerSyngas to Cooling and Cleanup

Air

MixingZone

Riser Cyclone

Standpipe

J-leg

StartupBurner

AirSteam

Coal Loopseal

Kemper County IGCC

Location• Kemper County, MS

• Near Liberty

• Approximately 20 miles

north of Meridian, MS

Meridian

Liberty

Kemper County IGCCProject Facts

• First-of-a-kind plant based on the transport gasifier developed at the Power Systems Development Facility (PSDF)

• Approximately 550 MW integrated gasification combined cycle (IGCC) power plant

• Owned and operated by Mississippi Power Company

• Startup proposed in 2013

Kemper County IGCCProject Facts (Continued)

• Fueled by lignite from nearby mine (to be operated by North American Coal)

• Also capable of using natural gas

• IRS awarded the project $133 million in Investment Tax Credits (ITC)

• Other DOE funding is possible

Kemper County IGCC

Project Facts (Continued)• 2 gasifiers (Transport)• 2 gas cleanup systems (particulate,

nitrogenous compounds, sulfur, mercury) • 2 combustion turbines (GE 7F) / heat

recovery steam generators• 1 steam turbine

Kemper County IGCC

Heat RecoverySteam Generator

SteamTurbine

GasifierLignite / AirGas

Clean UpCombustion

Turbine

GasifierLignite / AirGas

Clean UpCombustion

Turbine

Heat RecoverySteam Generator

STACK

STACK

ASH

ASH

SYNGAS

SULFURAMMONIA

SULFURAMMONIA

ELECTRICITY

ELECTRICITY

EXHAUST GAS

EXHAUST GAS

STEAM

Preliminary DRAFT 11/2007

SYNGAS

Why Coal? U. S. Has More Coal Than Any Other Nation

Kemper County IGCC

What Is Lignite?

• Lignite is young coal

• Very high moisture

• Low energy value or “Btu” content

• Only economical to transport short

distances

Kemper County IGCC

Lignite• Partnering with North American

Coal (NAC)

• NAC is largest lignite miner in the U.S.

• Operates Red Hills mine in Ackerman, MS.

Kemper County IGCC

Kemper County IGCC

Environmental Permitting/NEPA Activities

• PSD Application was submitted to MDEQ in December, 2007

• DOE will be preparing an Environmental Impact Statement (EIS)

• Construction is expected to begin in 2010

• Operation of the facility is expected in 2013

Questions?