Process for arranging drill holes in spontaneous combustion coal seam to implement nitrogen injection and grouting fire prevention and extinguishing

A technology for fire prevention and nitrogen injection, which is used in fire prevention, dust prevention, safety devices, etc., can solve problems such as inability to accurately grasp the range and accuracy of nitrogen injection, difficulty in hosting and pulling, loss and diffusion, etc., to eliminate spontaneous combustion and ignition of coal seams. hidden dangers, shorten the oxidation zone, and reduce the effect of oxygen concentration

Pending Publication Date: 2021-12-31
YAOJIE COAL ELECTRICITY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned technical problems, the present invention provides a nitrogen injection and grouting anti-fire extinguishing process by arranging drill holes in the self-combustible coal seam, which can solve the current nitrogen injection process, which is prone to

Method used

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  • Process for arranging drill holes in spontaneous combustion coal seam to implement nitrogen injection and grouting fire prevention and extinguishing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] like figure 1 As shown in Fig. 1, the drill holes are arranged in the self-combustible coal seam to implement nitrogen injection and grouting to prevent and extinguish the fire, including the following steps:

[0020] 1) Units are divided according to the direction and inclination of the coal mining face and the three-zone conditions of the goaf, and each 40m is a unit, and the layout of the dual-purpose drilling 1 is determined in the unit, and the distance between the final holes of the dual-purpose drilling 1 is 30m ;

[0021] 2) When the initial mining of the coal mining face is completed, a dual-purpose borehole 1 is drilled at the cutting hole of the working face;

[0022] 3) When the one-hole dual-purpose borehole 1 in each unit section enters the goaf for 35m, the one-hole dual-purpose borehole 1 is merged into the nitrogen injection pipeline system, and preventive nitrogen injection and fire prevention measures are implemented;

[0023] 4) According to the sp...

Embodiment 2

[0028] like figure 1 As shown in Fig. 1, the drill holes are arranged in the self-combustible coal seam to implement nitrogen injection and grouting to prevent and extinguish the fire, including the following steps:

[0029] 1) Units are divided according to the direction and inclination of the coal mining face and the three-zone conditions of the goaf, and each 40m is a unit, and the layout of the dual-purpose drilling 1 is determined in the unit, and the distance between the final holes of the dual-purpose drilling 1 is 30m ;

[0030] 2) When the initial mining of the coal mining face is completed, a dual-purpose borehole 1 is drilled at the cutting hole of the working face;

[0031] 3) When the one-hole dual-purpose borehole 1 in each unit section enters the goaf for 40m, the one-hole dual-purpose borehole 1 is merged into the nitrogen injection pipeline system, and preventive nitrogen injection and fire prevention measures are implemented;

[0032] 4) According to the sp...

Embodiment 3

[0036] like figure 1 As shown in Fig. 1, the drill holes are arranged in the self-combustible coal seam to implement nitrogen injection and grouting to prevent and extinguish the fire, including the following steps:

[0037] 1) Units are divided according to the direction and inclination of the coal mining face and the three-zone conditions of the goaf, and each 40m is a unit, and the layout of the dual-purpose drilling 1 is determined in the unit, and the distance between the final holes of the dual-purpose drilling 1 is 30m ;

[0038] 2) When the initial mining of the coal mining face is completed, a dual-purpose borehole 1 is drilled at the cutting hole of the working face;

[0039] 3) When the one-hole dual-purpose borehole 1 in each unit section enters the goaf for 37m, the one-hole dual-purpose borehole 1 is merged into the nitrogen injection pipeline system, and preventive nitrogen injection and fire prevention measures are implemented;

[0040] 4) According to the spee...

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Abstract

The invention discloses a process for arranging drill holes in a spontaneous combustion coal seam to implement nitrogen injection and grouting fire prevention and extinguishing. The process comprises the following steps that 1) units are divided according to the trend and the inclination of a coal face and three conditions of a goaf; 2) one-hole dual-purpose drill holes are drilled in the open-off cut position of the coal face; 3) after the one-hole dual-purpose drill holes in each unit section enter the goaf, the one-hole dual-purpose drill holes are merged into a nitrogen injection pipeline system; 4) according to the stoping advance speed and the divided units, one-hole dual-purpose drill holes of the next unit are constructed and arranged in advance; and 5) after the one-hole dual-purpose drill holes of the next unit are merged into the nitrogen injection pipeline system, nitrogen injection of the one-hole dual-purpose drill holes of the previous unit is stopped, and then the one-hole dual-purpose drill holes of the previous unit are merged into a grouting system. The problems that in an existing nitrogen injection process, the phenomena that pipe supporting and pulling are difficult, and pipe breaking occurs are prone to occurring, meanwhile, nitrogen is prone to being lost and diffused along the open-off cut of the stoping face, the purpose of inhibiting spontaneous combustion of the goaf cannot be achieved, and the nitrogen injection range and precision cannot be accurately mastered can be solved.

Description

technical field [0001] The invention relates to the technical field of coal seam spontaneous combustion mine fire prevention and extinguishing technology, in particular to arranging boreholes in spontaneous combustion coal seams to implement nitrogen injection and grouting fire prevention and extinguishing technology. Background technique [0002] Haishiwan 6123 -2 The working face is located in the first mining area of ​​the minefield. The working face is in the shape of a long strip with a strike of EW. The design strike length is 463m, the mining strike length is 438m, the inclination length is 189m, the mining height is 4m, and the average mining height is 4.69m. The flat area is 82,782㎡, and the recovered coal volume is about 1.54 million tons. The ventilation mode of the working face is U-shaped ventilation. [0003] 6123 -2 The relationship between the surrounding working faces of the working face: 6123 -2 Working face top 6123 -1 Goaf of the working face; 6122 a...

Claims

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Application Information

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IPC IPC(8): E21F5/00E21F5/08
CPCE21F5/00E21F5/08
Inventor 张田录陈淼铎周南江
Owner YAOJIE COAL ELECTRICITY GROUP
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