Patent ID: 8764884
Filing Date: 2014-07-01
Classification: B01D,Y02C

Abstract:
1. A CO 2 recovery method including causing CO 2 -containing gas to come in contact with CO 2 -absorbing solution to produce CO 2 rich solution in an absorption tower, conveying the rich solution to a regeneration tower including an upper-portion regeneration tower and a lower-portion regeneration tower, and producing a lean solution from the rich solution by removing CO 2 from the rich solution in the regeneration tower, the CO extracting lean solution that accumulates near a bottom portion of the regeneration tower, heating extracted lean solution with saturated steam to produce steam condensate from the saturated steam, and returning the extracted lean solution after heating the saturated steam to the regeneration tower; obtaining a semi-lean solution from the upper-portion regeneration tower; branching the rich solution into first and second rich solution parts; heat-exchanging the first rich solution part with the steam condensate; heat-exchanging the second rich solution part with the semi-lean solution; conveying the heat-exchanged first rich solution part to the lower-portion regeneration tower; and conveying the heat-exchanged second rich solution part to the upper-portion regeneration tower.