CO2 recovery apparatus and CO2 recovery method

摘要

Provided are a CO 2 absorber that reduces CO 2 contained in flue gas; a regenerator (18) that reduces CO 2 contained in rich solvent absorbing CO 2 to regenerate the rich solvent, so that lean solvent having the CO 2 reduced in the regenerator (18) is reused in the CO 2 absorber; a heat exchanger (23) that allows the rich solvent to exchange heat with the lean solvent; and a controller (40) that controls to extract rich solvent portion that is part of the rich solvent, to allow the rich solvent portion to bypass the heat exchanger (23), and to be supplied into the top of the regenerator (18) without exchanging heat so as to minimize a sum of an enthalpy that is taken out of the regenerator (18) as CO 2 gas accompanying steam and an enthalpy of the lean solvent after heat exchange with the rich solvent in the heat exchanger (23).