A CO 2 recovery system 10 A has a CO 2 recovery unit 11 , a compression unit 12 , and a condensed-water supply line 65 A that supplies condensed water 64 to an absorbent regenerator 14 . The CO 2 recovery unit 11 includes a CO 2 absorber 13 and the absorbent regenerator 14 . The compression unit 12 has a first compressor 61 - 1 to an nth compressor 61 - n that compress CO 2 gas 56 emitted from the absorbent regenerator 14 , a first separator 63 - 1 to an nth separator 63 - n that reduce moisture in the CO 2 gas 56 , and a first heat exchanger 66 - 1 that performs heat exchange between the CO 2 gas 56 emitted from the first compressor 61 - 1 and the condensed water 64 emitted from the first separator 63 - 1.
1. A CO 2 recovery system comprising:
a CO 2 recovery unit comprising a CO 2 absorber that absorbs and reduces CO 2 in flue gas containing CO 2 using a CO 2 absorbent by bringing the flue gas into contact with the CO 2 absorbent, and an absorbent regenerator that regenerates a CO 2 absorbent having absorbed CO 2 in the CO 2 absorber to obtain a CO 2 absorbent;
a CO 2 compression unit including a set of a compressor and a separator, wherein the compressor compresses CO 2 gas emitted from the absorbent regenerator and the separator is located downstream of the compressor to separate moisture contained in the CO 2 gas as condensed water from the CO 2 gas by cooling compressed CO 2 gas emitted from the compressor;
a condensed-water supply line that supplies the condensed water separated from the CO 2 gas through the seperator into a system in which the CO 2 absorbent circulates between the CO 2 absorber and the absorbent regenerator; and
a heat exchanger located on the condensed-water supply line, which subjects the condensed water emitted from the separator to heat exchange with the CO 2 gas emitted from the compressor.
2. The CO 2 recovery system according to claim 1 , wherein the system between the CO 2 absorber and the absorbent regenerator is at least one of the following consisting of a bottom of the absorbent regenerator, an inside of the CO 2 absorber, CO 2 absorbent circulating between the CO 2 absorber and the absorbent regenerator, return water to be supplied to the absorbent regenerator from a separation drum that separates water from the CO 2 gas emitted from the absorbent regenerator, and a top circulating-water line of the absorber.