Process for producing natural gas by coal coking and pyrolysis coal gas thereof

Abstract

The invention relates to a process for producing natural gas by coal coking and pyrolysis coal gas thereof, in the process, raw coal gas generated by a coke oven taking H2 as fuel is purified and then completely sent to a mixer for being directly mixed with part of clean gasified coal gas for regulating hydrogen-carbon ratio, and then methanation reaction is performed under the action of a catalyst so as to prepare a product, namely the natural gas; and transformation and decarburization are performed on the other part of the clean gasified coal gas, then carbon dioxide is enriched and caught, and produced hydrogen is sent to the coke oven for burning and supplying heat. In the process, coal gasification and coke dry quenching are simultaneously performed, and a set of air separation device is realized for providing a heat carrier, namely N2, and a gasifying agent, namely O2, for the coke dry quenching and the coal gasification respectively, thereby enabling the air separation processeffect to be higher. Coke making by hydrogen burning, air separation, the coke dry quenching, the coal gasification and methanation of the coal gas of the coke oven are organically integrated, and the clean production in the coking industry and the economic and high-efficient utilization of the pyrolysis coal gas are realized, thereby having great application value in the aspects of energy utilization, CO2 emission reduction and environmental protection.

Description

technical field [0001] The present invention relates to a coking and pyrolysis method of coal gas to produce natural gas, in particular to a method based on coking, dry quenching, coal gasification and coke oven gas methanation, and realizes carbon dioxide emission reduction by coking and its pyrolysis of coal gas to produce natural gas Technological scheme of the process. Background technique [0002] In the existing coking and its pyrolysis gas-to-natural gas process, coke oven heating is mainly based on pyrolysis gas, and the CH in the gas 4 25%, CO 6%, CO 2 4% and C m h n 2% Combustion will emit a lot of CO 2 . On the other hand, CH-rich 4 Part of the pyrolysis gas is returned to the furnace for combustion, and the subsequent process methanizes the pyrolysis gas into natural gas, which makes the process of pyrolysis gas to natural gas complicated and costly. If all the pyrolysis gas is used to produce natural gas, CH 4 Large yield, can make CH 4 Lowest cost o...

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Problems solved by technology

[0007] In the existing publicly reported literature, there is no realization of CO 2 The coking process for emission reduction, not to mention the coal gas-to-natural gas process developed by comprehensively considering issues such as dry quenching, pyrolysis of coal gas to natural gas, and high-temperature coke quenching energy recovery

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