Chilled ammonia-based carbon dioxide abatement system with stacked sections

A chilled ammonia-based carbon dioxide removal system comprising:

• a direct contact cooler adapted to receive and cool a flue gas containing gaseous carbon dioxide;
• a carbon dioxide absorber disposed downstream of and fluidly coupled to the direct contact cooler to receive the cooled flue gas from the direct contact cooler and to absorb the gaseous carbon dioxide from the flue gas via an ammonia-based CO2-lean solution to form an ammonia-based CO2-rich solution stream and a CO2-lean flue gas stream;
• an ammonia water wash section fluidly coupled to the absorber and adapted to receive the CO2-lean flue gas stream from the carbon dioxide absorber and to absorb ammonia slip from the flue gas via a washing solution and form an ammonia-rich water stream;
• a first stack comprising:
• a regenerator fluidly coupled to the absorber and adapted to receive the ammonia-based CO2-rich solution stream from the carbon dioxide absorber, to release CO2 from the ammonia-based CO2-rich solution stream, and to return ammonia-based CO2-lean solution to the carbon dioxide absorber;
• a CO2 water wash section adapted to receive gaseous carbon dioxide from the regenerator and absorb ammonia from the carbon dioxide stream via a washing solution and form an ammonia-rich water stream;
• and
• an ammonia stripper adapted to receive the ammonia-rich water stream from the CO2 water wash section and from the ammonia water wash section and to remove ammonia from the ammonia-rich water streams and to return ammonia to the carbon dioxide absorber and ammonia-lean washing solution to the CO2 water wash section and the ammonia water wash section;
• and
• a direct contact heater fluidly coupled to the ammonia water wash section and adapted to receive the ammonia-lean, CO2-lean flue gas from the ammonia water wash section, and to heat the flue gas prior to discharging the flue gas to atmosphere.