System and method for preparing methanol by deeply purifying coke oven gas

Abstract

The invention provides a system and method for preparing methanol by deeply purifying coke oven gas, and belongs to the field of coke oven gas purification. The 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, harmful substances such as dust, benzene, tar, naphthalene, ammonia and sulfur in the coke oven gas are deeply removed, and the problem that the stable operation of a system is influenced after sulfur and ammonia in the coke oven gas exceed the standard is solved; and the problems that tar and naphthalene in the coke oven gas can cause blockage of a compression system, and the operation cost of fine desulfurization is increased due to abnormal coarse desulfurization are solved. Through pretreatment, the coke oven gas does not need to be desulfurized after returning to the coke oven, so that the investment of a flue gas desulfurization device and the generation of desulfurization waste liquid can be reduced. The hydrogen-carbon ratio of the synthesis gas is adjusted through a conversion technology to ensure that hydrogen and carbon in the coke oven gas can be utilized to the maximum extent, so that the yield of methanol can be increased.

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 methanol. 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 natural gas with medium calorific value, 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 coke oven gas returns to the coke oven, and the remaining coke oven gas is considerable. Therefore, how to re...

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Problems solved by technology

[0009] In order to solve the current technical problems that may affect the stable operation of the post-system, cause compressor blockage, and cause early failure of the desulfurizer for fine desulfurization and increase operating costs in the current hydrogen production through coke oven gas, the invention provides a coke oven gas depth System and method for purifying methanol

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