CO2 recovery unit and method therefor

摘要

A CO2 recovery unit 10A according to a first embodiment has a CO2 absorber that removes CO2 in flue gas by bringing the flue gas containing CO2 into contact with a CO2 absorbent 12, and a regenerator 15 that diffuses CO2 in a rich solution 14 having absorbed CO2 in the CO2 absorber. The CO2 recovery unit 10A includes a first compressor 29-1 to a fourth compressor 29-4 that compress CO2 gas 16 discharged from the regenerator 15, a dehydrating column 33 that reduces moisture in the CO2 gas 16 by bringing the CO2 gas 16 into contact with a dehydrating agent 32, a combustion removal unit 41 that removes the dehydrating agent 32 mixed in the CO2 gas 16 in the dehydrating column 33, and a heat exchanger 42 that performs heat exchange between the CO2 gas 16 discharged from the third compressor 29-3 and the CO2 gas 16 discharged from the dehydrating column 33.

主权项

1. A CO2 recovery unit including a CO2 absorber that brings flue gas containing CO2 into contact with a CO2 absorbent and removes CO2 in the flue gas, and a regenerator that diffuses CO2 in a rich solution having absorbed CO2 in the CO2 absorber, to reuse in the CO2 absorber a lean solution which is obtained by removing CO2 from the rich solution in the regenerator, comprising:
at least two compressors that compress CO2 gas discharged from the regenerator; a dehydrating column that is provided between any two of the compressors and reduces moisture in the CO2 gas by bringing the CO2 gas into contact with a dehydrating agent; a combustion removal unit that removes the dehydrating agent mixed in with CO2 gas in the dehydrating column; and a heat exchanger that is provided between the dehydrating column and the combustion removal unit and performs heat exchange between CO2 gas discharged from any one of the compressors and CO2 gas discharged from the dehydrating column.