Patent ID: 8647420

Claim:
A system for recovering carbon dioxide from flue gas, comprising: an absorber that brings CO 2 absorbent that absorbs CO 2 contained in flue gas discharged from a boiler plant into contact with the flue gas to remove CO 2 from the flue gas; a regenerator that strips CO 2 from CO 2 absorbent that is fed from the absorber and has absorbed the CO 2 to regenerate the CO 2 absorbent; a plurality of internal shells provided at a bottom of the regenerator with a predetermined interval therebetween, into which regenerated CO 2 absorbent is introduced by a feeding unit from a bottom side thereof so that the CO 2 absorbent overflows from an upper end of the internal shell thereof toward the bottom of the regenerator; and a reboiler that is inserted into the internal shell in a direction orthogonal to a vertical axis and includes a heat-transfer tube that reboils CO 2 absorbent, wherein the system transfers steam separated from CO 2 absorbent reboiled by the heat-transfer tube to an upper part of the regenerator, and the system causes condensed CO 2 absorbent to overflow from the upper end of the internal shell and to be discharged from a bottom side of the regenerator, and feeds the CO 2 absorbent to the absorber as regenerated CO 2 absorbent.