Method for deoxidizing and finely desulfurizing coke oven gas

Abstract

The invention discloses a method for deoxidizing and finely desulfurizing a coke oven gas. The method comprises the following steps: (S1) heat exchanging and temperature rising; (S2) prehydrogenationconversion and first-stage hydrogenation conversion; (S3) first-stage desulfurization; (S4) secondary heat exchanging and temperature rising; (S5) second-stage hydrogenation conversion; (S6) second-stage fine desulfurization. According to the method for deoxidizing and finely desulfurizing the coke oven gas, disclosed by the invention, a two-stage coke oven gas hydrogenation deoxidization and finedesulfurization technology is adopted, most of organic sulfur in the coke oven gas can be converted into H2S by utilizing a first-stage hydrogenation deoxidization and desulfurization section, most of oxygen can be removed through hydrogenation, most of unsaturated hydrocarbon can be saturated through hydrogenation, and meanwhile, other impurities can be treated; the treated coke oven gas entersa second-stage hydrogenation deoxidization and fine desulfurization section, impurities of residual organic sulfur, unsaturated hydrocarbon, trace oxygen and the like can be subjected to secondary deep hydrogenation conversion and treatment, and deep purification of the coke oven gas can be realized.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a method for deoxygenating and finely desulfurizing coke oven gas. Background technique [0002] Coke oven gas contains trace impurities such as sulfur, olefins, oxygen, tar, naphthalene, hydrogen cyanide, ammonia, benzene, etc. When used as chemical raw materials, these impurities will poison the catalyst in the subsequent chemical process, causing the catalyst to partially or completely Deactivation; especially for modern high-efficiency conversion and synthesis catalysts, the sulfur content in the synthesis gas is required to be lower than 0.1×10 －6 ; and before the coke oven gas enters the steam reforming catalyst, the total content of impurities such as olefins is also required to be as low as possible below 50×10 －6 . Therefore, efficient removal of sulfur, olefins, tar, naphthalene, hydrogen cyanide, ammonia, benzene and other impurities in coke oven gas is the key to res...

AI Technical Summary

Problems solved by technology

[0015] Reactions 8 and 9 are strong exothermic reactions, which may cause the catalyst bed to overheat. The carbon produced in Reaction 8 will block the catalyst pores and cause catalyst deactivation. Therefore, the above reactions should be avoided

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