Praxair
Praxair’s Oxy-coal technology makes carbon capture easier and cheaper than conventional methods. The key to this technology is the use of pure oxygen and re-circulated flue gas instead of air in the coal combustion process. Air is roughly 4/5 nitrogen. By using oxygen instead of air, nitrogen is eliminated from the combustion mix, creating a purer stream of CO2. 
Carbon dioxide captured during this process is compressed and transported to an underground storage site. This process is called carbon sequestration. Other air emissions from this project are reduced by a factor of 10. Praxair and Foster Wheeler are developing two demonstration projects utilizing Oxy-coal technology, one in Spain and another in Jamestown, New York.
Rather than gasification technology, which IGCC facilities use, Oxy-coal technology will rely on a boiler similar to ones used on conventional coal plants. Foster Wheeler’s circulating fluidized bed steam generators, or CFBs, have a proven track record for dependability. Praxair’s Oxy-coal technology can also be used in conventional, pulverized coal steam generators.
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