System and method for recovering carbon dioxide from flue gas

Abstract

[Problem] To provide a system for recovering carbon dioxide from flue gas, in which a reboiler in a regenerator can be compactly installed, and a method therefor, in facilities where COor the like contained in flue gas is recovered. [Solving Means] To include an absorberthat absorbs COcontained in flue gas, a regeneratorthat strips COfrom COabsorbent (rich solution)to regenerate absorbent, internal shellsprovided at a bottom of the regeneratorwith a predetermined interval therebetween, into which regenerated COabsorbent is introduced by a feeding unitfrom a bottom side thereof so that the COabsorbent 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 shellsin a direction orthogonal to a vertical axis and includes a heat-transfer tubethat reboils absorbent. Steam separated from COabsorbent reboiled by the heat-transfer tubeis transferred to an upper part of a regenerator, condensed absorbent is caused to overflow from an upper end of the internal shell and to be discharged from a bottom side of a regenerator, and the absorbent is fed to the absorberas regenerated COabsorbent (lean solution)