Underground catalytic gasification process of coal

Abstract

The invention discloses an underground catalytic gasification technique for coal and is divided into the following steps: (1) an injection well consists of two vertical shafts arranged in interval and a communication passage which is located in the coal bed and communicates the two vertical shafts is arranged; (2) the two sides of the communication passage are respectively provided with an auxiliary well from ground to the coal bed with a certain distance from the communication well; (3) effective components of the catalyst and the carrier materials are mixed into catalyst grains with the grain diameter matching with the coal cracks; (4) the catalyst grains are evenly distributed to the coal cracks through high-pressure fluid; (5) the two vertical shafts in the injection well are respectively converted into a gas intake well and a gas outtake well and then the underground gasification production of coal is carried out by the prior art. By adopting the special catalyst grains and corresponding catalyst grain supply method, the invention solves the problem of the distribution of catalyst in the coal bed and realizes underground catalytic gasification of coal.

Description

technical field [0001] The invention belongs to the field of underground coal gasification production, in particular to an underground catalytic gasification process of coal. Background technique [0002] In the prior art, coal gasification is divided into surface gasification and underground gasification, wherein surface coal gasification is realized on the ground through a gasifier. According to the movement mode of coal in the gasifier, gasification methods can be divided into three categories, namely, fixed bed (moving bed) gasification, fluidized bed (bubbling bed) gasification and entrained bed gasification. Underground coal gasification is through roadway excavation or borehole excavation, and air holes, air flow channels, gasification areas, isolation areas and drainage channels are arranged in the natural coal seam, and finally an underground gasification furnace is formed (see patent CN 1854459A ), and then pass the gasification agent into the coal seam, ignite th...

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Problems solved by technology

[0005] It is precisely because of the excellent effect of catalytic gasification of coal by using catalysts that people also hope to realize the catalytic gasification of coal underground. However, due to the particularity of underground coal gasification, the existing surface catalytic gasification Various technical means cannot be applied to the underground coal gasification, which is why there are few reports on the underground catalytic gasification technology of coal. Barriers to Catalytic Gasification

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