Deep purification system and method for coke oven gas

Abstract

The invention provides a deep purification system and method for coke oven gas, and belongs to the field of coke oven gas purification. A pre-washing tower is arranged as a supergravity rotating device, so that the coke oven gas subjected to benzene removal can be subjected to primary impurity removal in the pre-washing tower through a supergravity rotating technology, and harmful substances such as dust, benzene, tar, naphthalene, ammonia and sulfur in the coke oven gas subjected to benzene removal are deeply removed; and the problem that sulfur and ammonia in the coke oven gas exceed the standard to influence stable operation of a system is solved, and the problem that tar and naphthalene in the coke oven gas cause blockage of a compression system is also solved. The invention provides a system for further removing impurities with complex components in coke oven gas by adopting a low-temperature methanol washing technology through equipment such as a desulfurization tower, a thermal regeneration tower, a water washing tower, an azeotropic tower, a methanol-water separation tower, a methanol-rich flash tank and a four-phase separator, so that the indexes of purified gas can be ensured; and the problem that the coking desulfurization waste liquid cannot be radically treated can be solved through methanol regeneration and cyclic utilization.

Description

technical field [0001] The invention relates to the technical field of coke oven gas purification, in particular to a deep purification system and method for 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 designed annual ...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the current technical problems in the deep purification process of coke oven gas that will affect the stable operation of the subsequent system, cause compressor blockage, and cause early failure of the desulfurizer for fine desulfurization and increase operating costs, the invention provides a coke oven gas deep purification system and method

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