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Gas injection point retreating type coal underground gasification system and process

A technology of retreating the gas injection point and underground gasification, which is applied in coal gasification, underground mining, construction, etc., can solve problems such as blockage, achieve the effects of improving safety, eliminating ground surface subsidence, and saving investment

Inactive Publication Date: 2013-09-04
HENAN ZHONGKUANG KENENG COAL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the backfilling of grouting by adding a grouting buffer tank and one-way valve in the air supply system, and solve the problem of grouting blockage by continuously injecting high-pressure steam into the grouting

Method used

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  • Gas injection point retreating type coal underground gasification system and process
  • Gas injection point retreating type coal underground gasification system and process
  • Gas injection point retreating type coal underground gasification system and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of underground coal gasification system, see Figure 1 to Figure 4 , the system includes a ventilation roadway 1 and a plurality of underground coal gasification units 2 arranged in the coal seam, and the ventilation roadway connects a plurality of underground coal gasification units; wherein, the underground coal gasification unit includes a gasification unit arranged on a plane agent injection tunnel 2-1 and two gas transportation tunnels 2-2, the two gas transportation tunnels are arranged parallel to both sides of the gasification agent injection tunnel at a certain distance from the gasification agent injection tunnel, the two gas transmission tunnels and the gasification agent injection tunnel One end of the gasification agent injection roadway is connected to each other through the initial gasification roadway 2-3, and the other end of the two gas transportation roadways and the gasification agent injection roadway is isolated from the ventilation roadway t...

Embodiment 2

[0054] An underground coal gasification process is an underground gasification process based on the underground coal gasification system described in Example 1, wherein the sequence of steps of the process comprises: a step of cold test, a step of igniting the gasification working face, a gasification The steps of commissioning of the gasification working face and the steps of retreating the gas injection point for normal production of gasification;

[0055] The steps of the cold test include:

[0056] a. Static pressure relief test on the gasification working face: open the valves of all the inlet pipelines of the gasification working face of the gasification unit, close the valve of the gas outlet pipeline, supply air to the gasification unit, and record the pressure of the gasification working face from the gas outlet Ascent rate, maintain pressure at 60KPa or above, detect leakage;

[0057] b. Dynamic leakage rate measurement: open the inlet valve and outlet valve of one ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/295
Inventor 李文军苏倩倩
Owner HENAN ZHONGKUANG KENENG COAL CHEM
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