Patent ID: 7892509

Claim:
A CO 2 recovery system comprising: 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; a regeneration tower that receives the rich solution and produces lean solution from the rich solution by removing CO 2 from the rich solution; a first rich-solution conveying path that supplies the rich solution from the absorption tower to the regeneration tower; a heating member that is provided in the regeneration tower and that heats the rich solution in the regeneration tower with steam generated when regenerating the rich solution in the regeneration tower; a first lean-solution conveying path that conveys the lean solution from the regeneration tower to the absorption tower; a second rich-solution conveying path that extracts rich solution from the regeneration tower from a first point and returns extracted rich solution to the regeneration tower at a second point downstream of the first point; and a lean-solution heat exchanger provided in the first lean-solution conveying path and second rich-solution conveying path and heats the rich solution in the second rich-solution conveying path with the lean solution in the first lean-solution conveying path.