Patent ID: 8551416

Claim:
A system for recovering CO 2 from gasification gas containing CO, CO 2 , COS and H 2 S and for obtaining fuel gas for power generation, the system comprising: a CO shift reactor for subjecting a first amount of the gasification gas to conversion of CO in the part of the gasification gas into CO 2 ; a bypass through which a second amount of the gasification gas is caused to bypass the CO shift reactor and thereby not to be introduced thereinto; a COS converter for converting COS in the gas having passed through the bypass into H 2 S; a heat exchanger for heat exchanging between the gas which has passed through the CO shift reactor and the gas which is in the bypass and upstream of the COS converter; a H 2 S absorption apparatus for absorbing and removing H 2 S from a mixture gas of the gas having passed through the CO shift reactor and the gas having passed through the COS converter; a CO 2 recovering apparatus for absorbing, removing and recovering CO 2 from the resulting mixture gas from which H 2 S has been removed by the H 2 S absorption apparatus; and a line for supplying the resulting gas from which CO 2 has been removed by the CO 2 absorption apparatus as the fuel gas for power generation, wherein the gasification gas is divided into the first amount and the second amount so that lowering the CO 2 recovery and improving power generation efficiency are controlled by the second amount of the gasification gas.