| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for refining a gas in a coal gasification plant capable of suppressing energy loss associated with COrecovery in a coal gasification plant and capable of maintaining the soundness of a CO shift catalyst.SOLUTION: In a gas refining method provided with: a cleaning step 60 where, to a generated gas generated by gasifying a carbon-containing solid fuel and at least containing CO and HS, a water-soluble substance contained in the generated gas is removed; a CO shift step 70 in which the CO contained in the generated gas after the cleaning step is reacted with water vapor using a shift catalyst so as to be converted into COand H; and a CO/HS recovery step 80 in which the COand HS contained in the gas after the CO shift step are removed, the CO shift step is composed of two or more multistage shift reactors 20a, 20b, 20c, the shift reactors 20a, 20b on the upstream side are filled with a high temperature shift catalyst 12a, and the shift reactor 20c on the downstream side is filled with a low temperature shift catalyst 12b. |
