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METHOD AND SYSTEM FOR RECOVERING HIGH-PURITY CO2 FROM GASIFICATION GAS
METHOD AND SYSTEM FOR RECOVERING HIGH-PURITY CO2 FROM GASIFICATION GAS
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机译:从气化气中回收高纯二氧化碳的方法和系统
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摘要
To provide a method and a system for recovering CO2 from gasification gas, the method and the system being capable of preventing the recovered C02 from being contaminated with COS, without repeating cooling and heating operations and without increasing the steam consumption, even when the C02 recovery ratio is changed in recovering C02 from gasification gas. Gasification gas being produced in a gasifier 10 and containing CO, C02, COS and H2S is subjected to dust removal in a scrubber 20. Then, a part of the gas is subjected to a CO shift reaction, in which CO is converted into C02, in a CO shift reactor 30. Another part of the gasification gas is not subjected to the CO shift reaction by means of a bypass 34, and is mixed with the gas after the CO shift reaction. Thereby, the temperature of the mixture gas is set at 180°C to 300°C, and COS in the mixture gas is converted into H2S in a COS converter 40. The H2S is absorbed and removed by a H2S absorption apparatus 50. Then, C02 is absorbed and removed by a C02 absorb apparatus.
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