Patent ID: 8545782

Claim:
A CO 2 recovery apparatus comprising: a desulfurization tower which includes: a desulfurization unit configured to remove a sulfur content contained in exhaust gas; and a cooling unit configured to cool desulfurized exhaust gas, from which the sulfur content has been removed by the desulfurization unit, by using cooling water; an absorption tower which includes: a CO 2 absorption unit configured to absorb CO 2 contained in the desulfurized exhaust gas, from which the sulfur content has been removed by the desulfurization tower, into a basic amine compound absorbing solution by causing the desulfurized exhaust gas to come into contact with the basic amine compound absorbing solution; a washing unit configured to wash decarbonated exhaust gas, from which CO 2 has been removed by the CO 2 absorption unit, by causing the decarbonated exhaust gas to come into contact with washing water; and an acid washing unit configured to remove a basic amine compound entrained in the decarbonated exhaust gas, from which CO 2 has been absorbed by the CO 2 absorption unit, by causing the decarbonated exhaust gas to come into contact with acid water; and a regeneration tower configured to emit CO 2 gas and configured to regenerate the absorbing solution with heating to separate CO 2 and subsequently remove CO 2 from the absorbing solution; and an acid water production device configured to produce the acid water by causing the exhaust gas yet to be introduced into the desulfurization unit to come into contact with water, wherein the water to come into contact with the exhaust gas is condensed water generated by the desulfurization tower, the absorption tower, or the regeneration tower.