Pretreatment system and method for deep purification of coke oven gas

Abstract

The invention provides a pretreatment system and method for deep purification of coke oven gas, belongs to the field of coke oven gas purification, and aims to solve the problems that impurities in coke oven gas before comprehensive utilization can cause compressor blockage and cause advanced failure of a desulfurizer for fine desulfurization to increase the operating cost. The pretreatment system comprises a pre-washing tower, a four-phase separator, a circulating pump and a heat exchanger, the pre-washing tower is a supergravity rotating device, the four-phase separator is a horizontal three-weir type gas-liquid-liquid-liquid separator, a gas phase inlet of the pre-washing tower is connected with a coke oven gas pipeline, a liquid phase outlet of the pre-washing tower is connected with a feeding port of the four-phase separator, an intermediate phase fluid outlet of the four-phase separator is connected with a liquid inlet of the circulating pump, a liquid outlet of the circulating pump is connected with a liquid inlet of the heat exchanger, and a liquid outlet of the heat exchanger is connected with a liquid phase inlet of the prewashing tower.

Description

technical field [0001] The invention relates to the technical field of coke oven gas purification, in particular to a pretreatment system and method for deep purification of coke oven gas. Background technique [0002] Coke oven gas is an important by-product obtained in the coking process. In recent years, the research on the composition of coke oven gas has been quite mature. Coke oven gas is a medium calorific value natural gas with a hydrogen content of 50% to 60% and a methane content of 22% to 24%, which contains huge utilization value. A large amount of coke oven gas will be produced during the production of coke. If calculated according to the production of 1 ton of coke to produce 430 cubic meters of coke oven gas, the annual production of coke oven gas in my country is basically maintained at 180 billion cubic meters, of which about 45-50% The remaining coke oven gas is returned to the coke oven, and the remaining coke oven gas is equivalent to more than twice the ...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the technical problems that the impurities in the coke oven gas before the comprehensive utilization will affect the stable operation of the system, cause the compressor to be blocked, and cause the desulfurization agent of the fine desulfurization to fail early and increase the operating cost, the invention provides a coke oven gas depth Purified pretreatment system and method

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