Overview of Oxycombustion Technology ASME PTC 4.5 Kick-off Meeting Orlando, Florida December 16, D.K. McDonald, Technical Fellow, Babcock & Wilcox Co.

2 Oxy-combustion burns coal with a mixture of oxygen and recycled flue gas instead of air to produce a concentrated CO 2 stream for storage

Oxy-Coal Plant Configuration Air Separation Unit Boiler CO 2 Compression Air In Pure Oxygen (O 2 ) Nitrogen (N 2 ) Out Recycled Flue Gas CO 2 and Flue Gas Coal In CO 2 Capture (liquid) Ash SO 2 Other Captured Emissions Environmental Cleanup Equipment H2OH2O Boiler Island CPU ASU Other gases (NCGs) 3

Oxy-Coal Plant Configurations 4 Very High Sulfur Coals

Oxy-Coal Plant Configurations 5 High Sulfur Coals

Oxy-Coal Plant Configurations 6 Medium Sulfur Coals

Oxy-Coal Plant Configurations 7 Low Sulfur Coals

8 Oxy-Coal Air Emissions

9 Benefits of Oxy-Coal Combustion Oxy-combustion is potentially the highest efficiency and lowest cost CO 2 capture technology for coal fired plants* Near Zero Emissions of criteria air pollutants (NZEP) >90% CO 2 capture at pipeline quality and purity specifications Low technology risk – plant components are primarily conventional equipment modified for operation in the oxy-mode. An oxy-plant will look and operate like a conventional power plant. Can be retrofit as easily as post combustion capture  Same existing plant equipment and space requirements  No LP steam requirement (output can be increased by heat integration)  No new chemicals or solvents Unique operating options to can maximize output during the day * DOE/NETL Rev. 2, August 2008, “Pulverized Coal Oxy-combustion Power plants” DOE/NETL Rev.1, August 2007 “Cost and Performance Baseline for Fossil Energy Plants”

10 FutureGen 2.0 – Oxy-Combustion Project Project Structure Capture – Ameren Energy Resources (AER), teamed with B&W and Air Liquide Transport & Storage – FutureGen Alliance Meredosia Plant Meredosia, IL: Owned/operated by AER 3-coal fired units (2 retired) 1-oil-fired unit 200 MWe oil-fired Unit 4 built in 1975 Repower Unit 4 steam-turbine Purpose-built Oxy-PC boiler Illinois Coal, PRB or PRB blends Project Timeline Expect project award by Sept. 30, 2010 Phased approach to develop project Commission by end of 2015 Boiler Island CPU ASU

11 Meredosia Clean Coal Facility ASU Cold Box Direct Contact Cooler/ Polishing Scrubber Fabric Filter B&W Boiler CPU Temperature Swing Absorption CPU Cold Box Main WFGD Flue Gas to CPU ASU Main Heat Exchanger ASU Temperature Swing Absorption ASU Air Filter 2-Stage Direct Contact Cooler Liquid Oxygen Storage ID Fan Air/Recycle Heater Pulverizers

12 ASU cold box ASU air filter ASU main heat exchanger ASU nitrogen/water tower ASU Front End Temperature Swing Absorption ASU 2-stage Direct Contact Air Cooler ASU booster ASU Main Air compressor BFW preheater Oxygen Piping to Boiler ASU

13 CPU cold box CPU Front Temperature Swing Absorption CPU CO 2 Pumps CPU Flue Gas and CO 2 compressor CPU Main heat exchanger CPU Non-condensed gas Expanders CPU Flue Gas Filter CPU inlet pipe CPU

14 Comparison of Net Plant Efficiency for Carbon Capture Technologies

15 Comparison of Levelized COE for Carbon Capture Technologies

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