CO2 recovery device and CO2 recovery method

摘要

A CO 2 recovery device is provided with a CO 2 absorption tower (13) and an absorption-solution regeneration tower (14). The CO 2 absorption tower (13) has the following: a CO 2 absorption section (13A) in which CO 2 -containing flue gas (11A) is brought into contact with a CO 2 absorption solution (12), namely a basic-amine-compound absorption solution, so as to remove CO 2 from the CO 2 -containing flue gas (11A); and a water-washing section (21) in which decarbonated flue gas (11B) from which CO 2 has been removed is brought into contact with washing water (20) so as to remove accompanying substances accompanying the decarbonated flue gas (11B). The absorption-solution regeneration tower (14) regenerates the CO 2 absorption solution that has absorbed CO 2 . This CO 2 recovery device, in which a lean solution (12B) from which CO 2 has been removed is reused in the CO 2 absorption tower (13), has an aldehyde-removing agent supply unit (23) that supplies a sulfite-compound aldehyde removing agent (22) to a circulating washing-water line (L 1 ) that circulates the washing water (20) to the water-washing section (21).