Patent ID: 7918926

Claim:
A CO 2 recovery system including an absorption tower that receives CO 2 -containing gas and CO 2 -absorbing solution, and causes the CO 2 -containing gas to come in contact with the CO 2 -absorbing solution to produce CO 2 rich solution, and a regeneration tower that receives the rich solution and produces lean solution from the rich solution by removing CO 2 from the rich solution, the CO 2 recovery system comprising: a bottom lean-solution extraction path that extracts lean solution that accumulates near a bottom portion of the regeneration tower from a first point of the regeneration tower and returns extracted lean solution to a second point of the regeneration tower that is downstream of the first point; a regeneration heater arranged in the bottom lean-solution extraction path and heats the lean solution in the bottom lean-solution extraction path with saturated steam thereby producing steam condensate from the saturated steam; and a steam-condensate heat exchanger that heats, with the steam condensate, any one of the rich solution that is supplied from the absorption tower to the regeneration tower, and a semi-lean solution that is extracted outside from a middle portion of the regeneration tower and returned to the middle portion of the regeneration tower.