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?