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Underground coal gasification system and producing process

A technology for underground gasification and coal, which is applied in coal gasification, underground mining, construction, etc., can solve the problems of difficulty in stably controlling gasification efficiency and low gasification efficiency in the process of underground coal gasification, so as to eliminate surface collapse, improve quality and production. Safe and reliable effect

Inactive Publication Date: 2008-12-03
中矿天晟能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to propose an underground coal gasification system and its production process for the problems that the underground coal gasification process is difficult to control stably and the gasification efficiency is low.

Method used

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  • Underground coal gasification system and producing process
  • Underground coal gasification system and producing process
  • Underground coal gasification system and producing process

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Embodiment

[0027] An embodiment of an underground coal gasifier, see figure 1 , 2 , 3, 4 and 5, figure 1 It is a schematic diagram of an underground gasification production system viewed from above; the underground gasification furnace includes a ventilation tunnel 2 and a gas transportation tunnel 3 arranged in a coal seam 1, and the ventilation tunnel 2 and the gas transportation tunnel 3 are on a plane and parallel to each other , several gasification channels 4 are set in the coal seam 1, the gasification channels are parallel to each other, and the two ends are respectively connected with the ventilation roadway and the gas transportation roadway, and the drainage airtight wall 5 is arranged in the gas transportation roadway; The ends are respectively connected to the air inlet roadway 6 and the air return roadway 7 of the mine system (one end of the gas transmission roadway is first communicated with the air return roadway 7 and then isolated by the drainage airtight wall 5), and ...

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Abstract

The invention relates to an underground coal gasification system and a production process thereof. The system comprises an air course and a gas transmission course which are arranged in a coal seam, a plurality of gasification channels are arranged in the coal seam, the two mutually parallel ends of each gasification channel respectively communicate with the air course and the gas transmission course, and a water drainage closed wall is arranged in the gas transmission course; and the both ends of the air course are respectively connected with an intake airway and a return airway of a mine system. The gasification process comprises the following steps: igniting; judging whether the burning point is required to be moved forward; moving the burning point of the coal seam backwards; plugging a gas passage of a combustion-supporting gas injection branch pipe which is disabled, and filling a burning control area with paste. The coal underground gasification system and the production process have the advantages that the coal seam can be mined to the utmost extent; the leakage of the combustion-supporting gas to the burning control area can be thoroughly cut off when the secure retraction during the coal underground gasification process is realized; the problem that the gasification agent is short-circuited because a passage is formed due to the collapsing of the coal seam floors in the gasification channel and the earlier period gasification area can be solved in the later period of the underground coal gasification, the gas production is secure and reliable, and the gasification rate is high.

Description

technical field [0001] The invention relates to the field of underground coal gasification production, in particular to an underground coal gasification system and a production process thereof. Background technique [0002] Due to the existence of a large number of thin coal seams and coal resources with low metamorphism, people began to study coal in-situ gasification technology very early. Underground gasification production mines and their efficient processes for producing coal gas. The Chinese patent of Publication No. CN1298058A "An Underground Gasifier for Coal Gas Production in Mine" has a structure that 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; Publication No. CN1112188A's Chinese patent "pipe-drawing gas injection point retreat type coal bed gasification method" adopts the fusing method to melt the gas injection pipe mouth section by section to realize the gas...

Claims

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Application Information

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IPC IPC(8): E21B43/295
Inventor 李文军
Owner 中矿天晟能源科技有限公司
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