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Method for ground fire extinguishing drilling cracking of irregular goaf in coal mine

A goaf, informal technology, applied in the fields of mining fluids, mining equipment, earthwork drilling, etc., can solve problems such as inability to effectively pour fire-extinguishing materials, easy drilling of holes to coal pillars, etc., to reduce the number of construction, The effect of saving fire fighting costs and improving fire fighting efficiency

Inactive Publication Date: 2019-03-12
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of supercritical CO 2 The method of fracturing coal mine informal goaf fire extinguishing drilling is mainly used to solve the problem that the informal goaf is easy to drill into the coal pillar and cannot effectively pour fire extinguishing materials

Method used

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  • Method for ground fire extinguishing drilling cracking of irregular goaf in coal mine

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Embodiment Construction

[0009] The present invention mainly consists of CO 2 Storage tank, CO 2 Tank car, CO 2 Composed of a booster pump, a high-pressure resistant low-temperature pipe, and a high-pressure nozzle. In order to achieve the above purpose, the technical solution includes the following steps:

[0010] Step 1, the CO 2 Tanks and CO 2 The tank car is connected in parallel, and then sequentially connected with the CO 2 The booster pump truck and high-pressure and low-temperature resistant pipes are connected to ensure the normal operation of all monitoring instruments;

[0011] Step 2, select the borehole drilled to the leftover coal pillar in the goaf, insert the lower nozzle of the high-pressure and low-temperature pipe into the bottom of the borehole, and install a high-pressure nozzle under the lower nozzle of the high-pressure and low-temperature pipe. At 5 meters above the lower nozzle of the high-pressure and low-temperature pipe, high-density cement mortar is poured between the...

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Abstract

The invention relates to a method for ground fire extinguishing drilling cracking of an irregular goaf in a coal mine, and belongs to the technical field of coal mine fire prevention. The method comprises the steps of selecting drilling holes drilled into remaining coal pillars of the goaf, injecting a lower nozzle of a high pressure resistant low temperature pipe into the bottoms of the drillingholes, using a sealing material to prepare a sealing section around the lower nozzle of the high pressure resistant low temperature pipe at a distance of 5 meters above the high pressure resistant lowtemperature pipe, using a booster pump to introduce high pressure carbon dioxide through an upper nozzle of the high pressure resistant low temperature pipe to form pressed cracks on the remaining coal pillars of the goaf, and pouring a fire extinguishing material and high pressure carbon dioxide mixture from the upper nozzle of the high pressure resistant low temperature pipe through the boosterpump.

Description

technical field [0001] The invention relates to a drilling and cracking method for ground fire extinguishing in informal goafs of coal mines, belonging to the technical field of coal mine fire prevention and control. Background technique [0002] Spontaneous coal seam fires often occur in coal mine goafs, especially in informal goafs such as small kiln goafs, housing mining goafs, and old goafs; informal goafs often have serious surface air leakage, which can easily cause mining Coal spontaneous combustion in the goaf, after the spontaneous combustion of the coal seam, the ground drilling is generally used to pour different fire extinguishing materials to extinguish the fire; since the general geological data of the informal goaf is unknown, and the distribution of the roadway and the goaf is unknown, the fire extinguishing drills arranged according to the distribution of the fire area Holes are easy to be drilled on the coal pillar left in the goaf, resulting in a low effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F5/00E21B33/13E21B43/26
CPCE21B33/13E21B43/261E21F5/00
Inventor 吴玉国杜杰王俊峰周春山
Owner TAIYUAN UNIV OF TECH
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