CO2 RECOVERY UNIT AND CO2 RECOVERY METHOD

摘要

A CO2 recovery device for recovery and removal of CO2 in CO2-containing exhaust gas (11A) that contains CO2 using a CO2-absorbing liquid (12) inside a CO2 absorption tower (13), wherein the CO2 absorption tower (13) is obtained by being provided with: a CO2-absorbing unit (13A) for absorbing CO2 in CO2-containing exhaust gas; a main aqueous cleaning unit (13C), which is provided on the gas flow downstream side of the CO2-absorbing unit (13A) and which uses rinsing water (20) to cool the decarbonated exhaust gas while using the rinsing water (20) to recover the accompanying CO2-absorbing liquid; and a preliminary aqueous cleaning unit (13B) provided between the CO2-absorbing unit (13A) and the main aqueous cleaning unit (13C). A portion (20a) of the rinsing water (20) containing the CO2-absorbing liquid that is circulating in the main aqueous cleaning unit (13C) is extracted and used for pre-rinsing in the preliminary aqueous cleaning unit (13B) and the pre-rinsing water is made to flow down directly to the CO2-absorbing unit (13A) side and merge with the CO2-absorbing liquid (12).