Method and device for co-production of synthetic ammonia and LNC (liquefied natural gas) by coke gas

Abstract

The invention provides a method for co-production of synthetic ammonia and LNC (liquefied natural gas) by coke gas, which is high in raw material utilization ratio. The method comprises the steps as follows: semi-water gas and purified coke gas are mixed and fed into a conversion unit, and then enters a low-temperature methanol washing unit for purification treatment; purified gas after purification treatment enters a two-in-one cooling box consisting of a liquid nitrogen washing unit and a cryogenic device, is further purified in the two-in-one cooling box and is configured into pure synthesis gas finally, and a ratio of H2 to N3 in the pure synthesis gas is 3:1; and the pure synthesis gas enters a synthetic ammonia unit to generate synthetic ammonia, and exhausted gas generated by the synthetic ammonia unit returns the two-in-one cooling box device to generate an LNG product. According to the method for co-production of synthetic ammonia and the LNC by the coke gas, methane in the purified coke gas and the semi-water gas and methane in the exhausted gas generated during the synthetic ammonia production process are separated out to produce the LNG, then residual available gas is utilized to produce synthetic ammonia, and the method has the advantages of short technological process and high virgin gas utilization ratio.

Description

technical field [0001] The invention relates to a process and a device for producing liquefied natural gas (liquefied natural gas) and synthetic ammonia, belonging to the technical field of coal chemical industry. Background technique [0002] Coke oven gas itself is characterized by a low C / H ratio, and is an ideal chemical raw material gas. If the comprehensive utilization of coke oven gas is realized and the integration of coal, coke, and chemicals is realized, it will not only combine the development of energy and the environment, but also Organically combining the traditional coking industry with the chemical industry and fertilizer industry has important practical significance for adjusting my country's energy structure and chemical industry structure and developing a new generation of coke oven gas comprehensive utilization technology. [0003] At present, the ways of comprehensive utilization of coke oven gas mainly include the following: using coke oven gas to produc...

AI Technical Summary

Problems solved by technology

Although these methods are mature in technology, they all have the disadvantage of low utilization rate of raw material gas, and the economic benefits cannot reach the best effect, thus restricting the continuous extension of this industrial chain

[0004] Among the many coke oven gas comprehensive utilization technologies today, there is no technology with low investment cost, short process flow, high utilization rate of raw material gas, and good economic benefits

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