Flue gas treatment system with ammonia solvent for capture of carbon dioxide

A CO2 capture system, comprising:

• a packed column configured to receive an aqueous ammonia solvent stream lean in CO2 at a top thereof and a flue gas stream having CO2 at a bottom thereof, the aqueous ammonia solvent stream and the flue gas stream in contact in the packed column in a counter-current arrangement to provide an outlet stream of ammonia solvent rich in CO2;
• a desorber configured to strip the CO2 from the outlet stream rich in CO2 at a temperature of less than approximately 100 degrees C. to produce stripped CO2 and to produce an aqueous ammonia solvent stream lean in CO2;
• and
• a source of heat configured to supply heat to the desorber.

A method for removing CO2 from a flue gas stream, comprising:

• contacting an aqueous ammonia solvent stream lean in CO2 with a flue gas stream having CO2, the aqueous ammonia solvent stream and the flue gas stream in contact in an absorber vessel in a counter-current arrangement;
• directing an outlet stream from the absorber vessel to a desorber, the outlet stream being rich in CO2 absorbed from the flue gas;
• heating the desorber;
• stripping the CO2 from the outlet stream rich in CO2 at a temperature of less than 100 degrees C. to remove at least a portion of the CO2 and producing the aqueous ammonia solvent stream lean in CO2;
• sequestering the CO2 stripped from the outlet stream rich in CO2;
• and
• returning the aqueous ammonia solvent stream lean in CO2 to the absorber vessel.