PROMOTER ENHANCED CHILLED AMMONIA BASED SYSTEM AND METHOD FOR REMOVAL OF CO2 FROM FLUE GAS STREAM
First Claim
1. A method of reducing power consumed by a system for capturing CO2 from flue gas, the method comprising:
- contacting a flue gas stream containing CO2 with an ammoniated solution lean in CO2 to provide an ammoniated solution rich in CO2;
regenerating the ammoniated solution rich in CO2 to release CO2 from the ammoniated solution, thereby producing the ammoniated solution lean in CO2;
recycling the ammoniated solution lean in CO2 from the regenerating step to the contacting step;
adding a promoter to the ammoniated solution lean in CO2, the promoter being effective to enhance the formation of ammonium bicarbonate within the ammoniated solution lean in CO2, thereby increasing the CO2 absorption capacity of the ammoniated solution lean in CO2; and
reducing the amount of ammoniated solution lean in CO2 that is recycled from the regenerating step to the contacting step, thereby reducing the power consumed by the system.
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Accused Products
Abstract
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.
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Citations
14 Claims
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1. A method of reducing power consumed by a system for capturing CO2 from flue gas, the method comprising:
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contacting a flue gas stream containing CO2 with an ammoniated solution lean in CO2 to provide an ammoniated solution rich in CO2; regenerating the ammoniated solution rich in CO2 to release CO2 from the ammoniated solution, thereby producing the ammoniated solution lean in CO2; recycling the ammoniated solution lean in CO2 from the regenerating step to the contacting step; adding a promoter to the ammoniated solution lean in CO2, the promoter being effective to enhance the formation of ammonium bicarbonate within the ammoniated solution lean in CO2, thereby increasing the CO2 absorption capacity of the ammoniated solution lean in CO2; and reducing the amount of ammoniated solution lean in CO2 that is recycled from the regenerating step to the contacting step, thereby reducing the power consumed by the system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of capturing CO2 from flue gas using system comprising 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, the method comprising:
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adding to the ammoniated solution a promoter effective to enhance the formation of ammonium bicarbonate within the ammoniated solution; and recycling an amount of the ammoniated solution from the regenerator vessel to the absorber vessel to remove an amount of CO2 from the flue gas, the amount of the ammoniated solution being less than that which would be required to remove the amount of CO2 from the flue gas using the ammoniated solution without the promoter. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification