Promoter enhanced chilled ammonia based system and method for removal of CO₂ from flue gas stream

摘要

A method and system for CO₂ capture from flue gas uses an absorber vessel in which a flue gas stream containing CO₂ is contacted with an ammoniated solution to remove CO₂ from the flue gas, and a regenerator vessel in which CO₂ is released from the ammoniated solution. Parasitic energy consumption of the system can be reduced by adding to the ammoniated solution a promoter effective to enhance the formation of ammonium bicarbonate within the ammoniated solution. The amount of ammoniated solution recycled from the regenerator vessel to the absorber vessel is less than that which would be required using the ammoniated solution without the promoter for removal of the same amount of CO₂ from the flue gas.