Nitrogen injection fireproofing method for adjacent goafs during tunneling along empty roadway

A goaf and nitrogen injection technology, applied in fire prevention, dust prevention, mining equipment, etc., can solve problems such as fire prevention in goafs, achieve the effects of reducing combustion intensity, reducing air leakage, and eliminating the risk of gas explosions

Inactive Publication Date: 2017-03-15
DATONG COAL MINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of difficult fire prevention in gobs during excavation, the present invention provides a fire prevention method for injecting nitrogen into adjacent goafs during excavation along goafs

Method used

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Embodiment Construction

[0021] The fire prevention method of nitrogen injection in adjacent gobs during excavation along goafs includes the following steps,

[0022] (1) To determine the nitrogen injection flow rate in the goaf, it can be calculated according to the oxygen concentration in the oxidation zone of the goaf, or according to the output,

[0023] (2) Determine the timing of nitrogen injection, and start nitrogen injection when any of the following conditions is met,

[0024] Ⅰ. The temperature in the goaf exceeds 26°C or the temperature rises by 1°C per day;

[0025] Ⅱ. The water temperature in the goaf exceeds 26°C;

[0026] Ⅲ. There are signs of fire in some parts of the working face, such as tar or kerosene smell;

[0027] Ⅳ. The shutdown time of the working face exceeds 5 days;

[0028] Ⅴ. The time to withdraw from the working face exceeds 15 days;

[0029] Ⅵ. The CO content in the goaf exceeds 40ppm or the CO content in the upper corner of the working face exceeds 30ppm for 3 cons...

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Abstract

The invention particularly relates to a nitrogen injection fireproofing method for adjacent goafs during tunneling along empty roadways, and solves the problem of difficult fire prevention in the goafs during tunneling. The nitrogen injection fireproofing method for adjacent goafs during tunneling along empty roadways comprises the following steps: determining nitrogen injection flow in the goafs and the time of the nitrogen injection, and starting the nitrogen injection if the following conditions meet anyone of the conditions including the temperature of the goafs over 26 DEG C or daily temperature rise of 1 DEG C; the water temperature of the goafs exceeding 26 DEG C; local parts of the workplace giving signs of fire, such as tar or kerosene odor; preburying nitrogen injection pipelines using a cross bedding method, with the step distance of 40 m, and cycling until the workplace is tunneled. The method applies the nitrogen injection fireproofing method to the fire prevention and control of the goafs during tunneling, not only eliminates the danger of gas explosion, reduces the effect of air leakage, plays the role of cooling, but prevents the self-heating and the spontaneous combustion of coal and reduces burning strength.

Description

technical field [0001] The invention relates to an underground coal mine fire prevention method, in particular to a fire prevention method for injecting nitrogen into adjacent goafs during excavation along a goaf roadway. Background technique [0002] Spontaneous combustion of coal is a very complicated process of physical and chemical changes. Existing fire prevention technologies include pressure equalization fire prevention technology, grouting fire prevention technology, chemical inhibitor fire prevention technology, inertization fire prevention technology, colloid fire prevention technology, foam fire prevention technology, etc. The basic starting points of these fire prevention technologies are as follows: one is to eliminate or destroy the oxygen supply conditions in the basic conditions of coal spontaneous combustion, and reduce the oxygen supply of coal spontaneous combustion oxidation; the other is to absorb heat and cool down, delay and completely prevent the proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/08
CPCE21F5/08
Inventor 郭金刚匡铁军李化敏蒋东杰王存权孟凡龙杨智文王文沈明柱赵君孟祥斌郝建峰李东印王海清翁旭泽孟志斌孙赫刘闯
Owner DATONG COAL MINE GRP
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