Gasification high-flash gas treatment system and method

Abstract

The invention discloses a gasified high-flash gas treatment system and method. The system comprises a first high-flash gas cooler, a first high-flash gas separator, a high-flash gas ammonia washing tower, a second high-flash gas cooler, a second high-flash gas separator, a high-flash gas washing tower, a sulfur-containing methanol pump and a condensate pump. After being cooled, separated and subjected to ammonia washing, the high-flash gas is washed with carbon-rich methanol in the low-temperature methanol washing system so as to remove H2S and COS, the washed high-flash gas contains a large amount of CO + H2 and can be directly sent to a fuel gas pipe network, and the high-flash gas serves as fuel gas to be combusted, so that the environment is better protected; sulfur-containing methanol at the bottom of the washing tower is pressurized by a pump and then sent to a sulfur-containing methanol flash tank in the low-temperature methanol washing system for desorption and regeneration of rich methanol, gasified high flash gas treatment is coupled with the low-temperature methanol washing system, and the system is simple, flexible to operate and low in equipment investment and operation cost.

Description

technical field [0001] The invention belongs to the technical field of chemical gas purification, and in particular relates to a gasification high flash gas treatment system and method. Background technique [0002] In the coal chemical industry, the black water discharged from the gasifier and scrubber of the coal gasification device contains a certain amount of synthetic gas. The black water undergoes multi-stage flash evaporation in the flash evaporation system. The gas is called high-pressure flash gas (high flash gas), which contains a large amount of effective gas (CO+H 2 ) and H 2 S, CO 2 Wait. Gasification high flash gas generally has two destinations: one is directly sent to the flare for combustion, but because the high flash gas contains a certain amount of H 2 S, produces SO after combustion 2 Toxic and harmful substances, such as toxic and harmful substances, have a certain impact on the environment and cause a waste of resources; the second is to send the ...

AI Technical Summary

Problems solved by technology

Gasification high flash gas generally has two destinations: one is directly sent to the flare for combustion, but since the high flash gas contains a certain amount of H2S, SO2 will be produced after combustion and other toxic and harmful substances have a certain impact on the environment and cause a waste of resources; the second is to send the high flash gas to a sulfur recovery unit for treatment, so that the H2 can be recovered S, but in actual production, due to factors such as high flash gas flow changes and water, it will often have an adverse effect on the operation of the sulfur recovery unit

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