CO2 RECOVERY DEVICE AND CO2 RECOVERY METHOD

摘要

A CO2 recovery device provided with a CO2 adsorption tower (13) and an absorption-solution regeneration tower (14). The CO2 absorption tower (13) has the following: a CO2 absorption section (13A) in which a CO2-containing waste gas (11A) is brought into contact with a CO2 absorption solution (12), namely a basic-amine-compound absorption solution, so as to remove the CO2 from the CO2-containing waste gas (11A); and a water-washing section (21) in which a decarbonated waste gas (11B) from which the CO2 has been removed is brought into contact with washing water (20) so as to remove accompanying substances accompanying the decarbonated waste gas (11B). The absorption-solution regeneration tower (14) regenerates the CO2 absorption solution that has absorbed CO2. This CO2 recovery device, in which a lean solution (12B) from which the CO2 has been removed is reused in the CO2 absorption tower (13), has an aldehyde-remover supply unit (23) that supplies a sulfite-compound aldehyde remover (22) to a circulating washing-water line (L1) that circulates the washing water (20) to the water-washing section (21).