A kind of underground coal gasification system and process with retreating gas injection point

A gas injection point retreat, underground gasification technology, applied in the direction of coal gasification, underground mining, construction, etc., can solve problems such as blockage, achieve the effect of improving safety, ensuring stability, and preventing quality degradation
CN103277082BInactive Publication Date: 2015-10-28HENAN ZHONGKUANG KENENG COAL CHEM
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HENAN ZHONGKUANG KENENG COAL CHEM
Publication Date
2015-10-28
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a gas injection point retreating type coal underground gasification system and process. The gas injection point retreating type coal underground gasification system comprises an airway arranged in a coal layer and multiple coal underground gasification units, wherein the airway is connected to the multiple coal underground gasification units; and the technical steps are sequentially as follows: a step of cold-state testing, a step of ignition on a gasification working surface, a step of debugging of the gasification working surface and a step of gasification normal production process. According to the invention, mud can be prevented from blocking the gas injection point efficiently, and the coal layer can be exploited to the maximum extent, so that possibility of thoroughly cutting off the leakage of a gasification agent to a combustion space area is realized while safe retreating in the coal underground gasification process is realized, filling of the combustion space area is realized, collapse of the ground surface caused by the gasification is removed, stability of the gasification channel structure is guaranteed, problem of the short circuit of the gasification agent caused by a channel which is resulted from collapse of a coal layer plate in the gasification area in the early stage and the gasification channel at the later stage of the underground gasification is solved, the quality of the coal gas is improved, and safe and reliable coal gas production and high gasification rate are achieved.
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Description

technical field

[0001] The invention relates to the field of underground coal gasification production, in particular to an underground coal gasification system and process with a retreating gas injection point. Background technique

[0002] Due to the existence of a large number of coal resources that cannot be mined manually or are uneconomical by manual mining, people have long begun to conduct research on in-situ coal gasification technology. The Chinese patent with publication number CN1298058A "a kind of underground coal gas production in mines" gasification furnace", its structure lacks the gas injection control of the gas injection pipe in the coal seam, so there are insufficient coal seam combustion and low coal utilization rate; the Chinese patent of publication number CN1112188A "pull pipe gas injection point retreating type "Using the fusing method to melt the gas injection pipe mouth section by section to realize the gas injection point retreat; as a result, the ...

Claims

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