System and method for deep purification of coke oven gas to produce hydrogen

Abstract

The invention provides a system and method for deep purification of coke oven gas to produce hydrogen, belonging to the field of coke oven gas purification. By setting the pre-washing tower as a super-gravity rotating device, the coke oven gas after debenzene can be preliminarily removed by super-gravity rotating technology in the pre-washing tower, so as to deeply remove the debenzene in the coke oven gas Harmful substances such as dust, benzene, tar, naphthalene, ammonia and sulfur solve the problem that excessive sulfur and ammonia in coke oven gas will affect the stable operation of the post-system, and also solve the problem that tar and naphthalene in coke oven gas will cause compression system It also solves the problem of abnormal rough desulfurization which causes premature failure of the desulfurization adsorbent for fine desulfurization and increases the operating cost. Through the pretreatment, the coke oven gas does not need to be desulfurized after returning to the coke oven, which can reduce the investment of the flue gas desulfurization device and the generation of desulfurization waste liquid. The decarburization operation by low-temperature methanol washing operation not only improves the decarburization accuracy, but also increases the hydrogen yield without consuming hydrogen during the decarburization process.

Description

technical field [0001] The invention relates to the technical field of coke oven gas purification, in particular to a system and method for deep purification of coke oven gas to produce hydrogen. 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 belongs to natural gas with medium calorific value, with hydrogen content of 50% to 60% and methane of 22% to 24%, which contains huge utilization value. When producing coke, a large amount of coke oven gas will be produced. If 430 cubic meters of coke oven gas is produced by producing 1 ton of coke, the amount of coke oven gas generated in my country is basically maintained at 180 billion cubic meters throughout the year, of which about 45-50% The coke oven gas is returned to the coke oven, and the remaining coke oven gas is equivalent to more than twice the designed annual gas t...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the current technical problems that will affect the stable operation of the post-system, cause compressor blockage, cause early failure of the desulfurizer for fine desulfurization, increase operating costs, and lower hydrogen yield when hydrogen is produced from coke oven gas, The invention provides a system and method for deep purification of coke oven gas to produce hydrogen

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