CO2 RECOVERY DEVICE AND CO2 RECOVERY METHOD

摘要

The CO2 recovery device: is provided with a CO2 absorption tower (13), which comprises a CO2-absorbing unit (13A) for removing CO2 by bringing CO2-containing exhaust gas (11A) that contains CO2 into contact with a CO2-absorbing liquid (12) that is a basic amine compound absorption liquid and an aqueous cleaning unit (21) for removing the accompanying substance that accompanies the decarbonated exhaust gas (11B) from which CO2 has been removed in the CO2-absorbing unit (13A) by bringing the decarbonated exhaust gas (11B) into contact with rinsing water (20), and an absorbing liquid-recycling tower (14) for recycling the CO2-absorbing liquid (rich solution (12A)) that has absorbed CO2; and re-uses the lean solution (12B), from which CO2 has been removed in the recycling tower (14), in the absorption tower (13). The CO2 recovery device comprises a de-aeration tank (80) that is disposed in the rich solution supply line (L11), which supplies the rich solution (12A) from the CO2 absorption tower (13) to the absorbing liquid-recycling tower (14), and has a retaining section (82) for removing the oxygen in the rich solution (12A).