Technique for coproducing methanol from coke oven gas and fuel products by hydrogenating coal tar prepared from tail gas of methanol preparation

Abstract

The invention relates to a hydrogenation process for preparing oil products from coal tar which is generated together with exhaust gas synthesized during preparation of methanol from a coke oven and coal gas. Methanol is prepared from coal gas which is the by-product of the coke oven, large amount of relief gas and nitrogen gas during the methanol preparation process, hydrogen is extracted from the relief gas and used as one of the materials for hydrogenation preparing light fule oil from tar, nitrogen is extracted as the material of a coke dry quenching unit, the heat energy generated during the coke dry quenching process is used for generating electric power. With the recycling of coke oven coal gas, the prior exhaust gas which is directly exhausted or burnt is changed into a high-value product, such as electricity, methanol, light fuel oil, advanced charcoal material, etc., at the same time, the object of energy conservation can be realized.

Description

technical field [0001] The invention relates to a process for preparing oil products by utilizing coke oven gas to prepare methanol synthesis tail gas and co-producing coal tar hydrogenation. Background technique [0002] At present, most domestic coking plants adopt the method of air emission or direct combustion. Even if they are recycled, they are limited to the production of methanol. The existing domestic coke oven gas production of methanol synthesis tail gas process: first through two-stage decompression, one The first-stage decompression is reduced from 6.0MPa to 2.0MPa at the outlet of the methanol separator, and the second-stage decompression is reduced from 2.0MPa to 0.2MPa, and then sent to the fuel gas tank. After searching, there is no further processing and utilization. At present, there is no complete coke oven gas to methanol synthesis tail gas co-production process of coal tar hydrogenation to light fuel oil, and no industrial production and comprehensive u...

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Problems solved by technology

After searching, there is no further processing and utilization. At present, there is no complete coke oven gas to methanol synthesis tail gas co-production coal tar hydrogenation to light fuel oil process at home and abroad, let alone industrialized production and comprehensive utilization of coke oven gas.