A method and system for controlling gas concentration in a high-gas coal mine mining face

A technology of mining working face and gas concentration, which is applied in the direction of gas discharge, pump control, mining equipment, etc., can solve the problems of low extraction efficiency of the gas drainage system and the inability to quickly reduce the gas concentration of the mining working face, and achieve rapid gas concentration The effect of reducing, saving electric energy and improving extraction efficiency

Active Publication Date: 2022-04-29
PEKING UNIV +1
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Problems solved by technology

[0004] The embodiment of the present application is to provide a method and system for controlling the gas concentration in the mining face of a high-gas coal mine, aiming to solve the problem that the gas extraction system of the coal mine has low extraction efficiency and cannot quickly reduce the gas concentration in the mining face when the gas concentration exceeds the limit. question

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  • A method and system for controlling gas concentration in a high-gas coal mine mining face
  • A method and system for controlling gas concentration in a high-gas coal mine mining face
  • A method and system for controlling gas concentration in a high-gas coal mine mining face

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Embodiment 1

[0042] refer to figure 1 , which shows a schematic structural diagram of a gas concentration control system for a high-gas coal mining face in the present application, as shown in figure 1 As shown, the gas concentration control system in the mining face of high-gas coal mines includes: gas drainage pump station, high negative pressure gas drainage system, low negative pressure gas drainage system, data acquisition system 4, data processing system, intelligent control valve 3.

[0043] The gas drainage pumping station includes a high negative pressure gas drainage pump 2 and a low negative pressure gas drainage pump 1 .

[0044] The high negative pressure gas drainage system includes high negative pressure drainage main pipe 6, high negative pressure drainage main pipe 8, high negative pressure drainage branch pipe 11, high negative pressure drainage unit pipe 12, high negative pressure drainage unit pipe 12 Connecting multiple parallel drainage boreholes, the high negative ...

Embodiment 2

[0058] Based on the gas concentration control system in the working face of a high gassy coal mine provided in Embodiment 1 of the present application, another embodiment of the present application provides a method for controlling the gas concentration of a working face in a high gassy coal mine, including:

[0059] In the gas drainage pipeline, pipeline pressure is an important factor affecting the gas drainage effect. The relationship between the gas drainage flow rate of a certain section of the drainage pipeline and the pressure difference of the pipeline is shown in formula (1):

[0060]

[0061] In formula (1), Q 流 ΔP is the pressure difference at both ends of the pipeline; ρ is the gas fluid density; g is the acceleration of gravity; S is the frictional resistance of the pipeline; L is the length of the pipeline.

[0062] In addition, when the negative pressure value of the extraction branch pipe is determined, the orifice negative pressure of the extraction unit c...

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Abstract

The invention proposes a gas concentration control method and system in a high-gas coal mine mining face. Among them, the control system includes gas drainage pumping station, high negative pressure gas drainage system, low negative pressure gas drainage system, data acquisition system, data processing system, intelligent control valve, and the high negative pressure gas drainage system and low The negative pressure gas drainage system is divided into four levels of management, including the main pipe, the main pipe, the branch pipe and the unit. Through the optimal adjustment program set, it provides intelligent adjustment of gas drainage from the two levels of pre-drainage and side-drainage. Under the premise of ensuring the gas drainage effect of the whole mine, the goal of rapidly reducing the gas concentration of the mining face in a short period of time will be achieved, and favorable conditions will be created for the rapid and efficient advancement of the working face.

Description

technical field [0001] The embodiments of the present application relate to the technical field of coal mine gas drainage, and in particular, relate to a method and system for controlling gas concentration in a mining face of a high-gas coal mine. Background technique [0002] The basic national conditions of "rich coal, poor oil, and little gas" determine that coal will be my country's main energy source for a long time to come. With the rapid development of China's economy in recent years, the demand for various resources is increasing day by day. As an "industrial food", the output of coal is also increasing year by year, which makes the national coal mining extend to the deep at a rate of about 10-20m per year. Therefore, the mining conditions of coal in some areas have deteriorated. It is more difficult to control the factors affecting coal mining such as stress. In order to reduce gas gushing, prevent gas exceeding the limit, reduce the risk of gas accidents, and pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00F04B49/22F04B49/06
CPCE21F7/00F04B49/22F04B49/06
Inventor 吕平洋王双勇
Owner PEKING UNIV
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