Patent ID: 8920548
Filing Date: 2014-12-30
Classification: B01D,Y02C

Abstract:
1. A CO 2 capture system by chemical absorption for removing CO 2 from a combustion exhaust gas by a solvent, comprising: an absorber for absorbing CO a regenerator for heating a rich solvent that has absorbed CO a rich solvent supply system for supplying the rich solvent from the absorber to the regenerator; a lean solvent supply system for supplying the lean solvent from the regenerator to the absorber; a heat exchanger for exchanging heat between the rich solvent and the lean solvent supplied from the respective supply systems; and a reboiler for heating the solvent supplied from the regenerator; the CO a gas exhaust system for discharging gas released from the solvent in the regenerator; a gas compressor installed downstream of the gas exhaust system; a heat exchanger disposed downstream of the gas compressor for exchanging heat between a compressed gas and a rich solvent to be supplied to the regenerator; a gas-liquid separator disposed downstream of the heat exchanger for separating gas from condensed water; a condensed water supply system for supplying condensed water from the gas-liquid separator to the regenerator; another gas exhaust system for discharging gas containing high-concentration CO a compressor, disposed downstream of the gas-liquid separator in the another gas exhaust system, for pressurizing the gas containing high-concentration CO a vapor recompression system for supplying vapor to the regenerator comprising: a decompression evaporator for evaporating the lean solvent discharged from the regenerator or the reboiler; a compressor for pressurizing vapor generated by the decompression evaporator; and a vapor system for supplying the vapor generated by the decompression evaporator to the compressor and supplying the vapor pressurized and heated by the compressor to the regenerator.