Simple and convenient goaf bundle pipe gas extraction device and method

Abstract

The invention discloses a simple and convenient goaf bundle pipe gas extraction device and method. The device mainly comprises a gas extraction pipeline, a phi 219 main pipe, seven one-sixth ball valves, a flow meter, a connecting pipe, a water drainage pipe, a sampling connecting pipe, a rubber pipe, a pump, connecting pipes of the main pipe and bundle pipes, the four bundle pipes, an embedded main pipe and a hose. The method includes the steps that gas is extracted from the interior of a goaf through negative pressure in the gas extraction pipeline, gas in the goaf is driven by negative pressure in the gas extraction pipeline to flow into the phi 219 main pipe through the bundle pipes, the pump is connected with the phi 219 main pipe through the rubber pipe to pump a proper amount of gas, sampled gas is collected in a sealed mode through sampling bags and analyzed through a gas chromatograph finally, the concentration change rule of various types of gas in the goaf is acquired, and on the basis, the positions and the ranges of three residual coal spontaneous combustion zones in the goaf are judged. The device and method have the advantages of being safe, efficient, simple, convenient to use and capable of saving energy.

Description

technical field [0001] The invention relates to a gas extraction device and method, in particular to a gas acquisition device and method in a mine goaf. Background technique [0002] The gas extraction analysis of pre-buried bundle pipes in goaf is the main method to study the oxidation distribution of goaf residual coal and determine the distribution range of "three zones" of spontaneous combustion of coal residual coal in goaf. [0003] At present, most of the mine goafs in our country use the negative pressure generated by the special explosion-proof air pump to extract the gas in the goaf through the bundled tubes. Although this method can directly solve the problem of gas extraction in the goaf, there are many shortcomings in the gas extraction system of the air pump: [0004] 1. Since the air pump belongs to electrical equipment, the requirements for using electrical equipment underground are very strict. It must be a special explosion-proof air pump to be used, and t...

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Problems solved by technology

[0004] 1. Since the air pump belongs to electrical equipment, the requirements for using electrical equipment underground are very strict. It must be a special explosion-proof air pump to be used, and the special explosion-proof air pump is more expensive.

[0005] 2. The environmental conditions of the underground working face are very harsh, the distance from the ground is far away, and the air pump is very heavy (about 300 kg in weight), so it is very troublesome to transport the air pump from the ground to a suitable position on the underground working face

[0006] 3. The air extraction pump needs a dedicated 380V power supply. The air intake system is far away from the power supply. It is very difficult to connect the electricity on site. It needs to pull hundreds of meters or even kilometers of cable lines. Therefore, if the air extraction pump is used to work, not only need to use expensive The dedicated cable and the dedicated power switch are connected to electricity, and consume a certain amount of electric energy. In addition, it also involves electrical safety issues, and there are certain potential safety hazards.

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