A cold water cooling and nitrogen injection system for buried pipes in gobs

Abstract

The invention discloses a goaf buried pipe cold water cooling and nitrogen injection system, comprising an industrial chiller and a water inlet pipeline, the water inlet pipeline is connected to the industrial chiller through a three-way valve, and the three-way valve is a The other end of the ground nitrogen generator is connected to the ground nitrogen generator. The water inlet pipeline passes through the auxiliary shaft, the mine transportation alley, the pedestrian air inlet inclined alley, the transportation uphill and the section transportation alley, and the end of the water inlet pipe passes through a three-way The second valve is connected with a U-shaped pipeline group. The U-shaped pipeline group is composed of a plurality of U-shaped single pipes in series. A safety valve is installed in the U-shaped single pipe, and a return valve is installed at the return water end. The return water valve is connected with the return water pipeline, and the return water pipeline passes through the section return air lane, the return air uphill, the return air alley and the return air well in turn, and the end of the return water pipeline is connected with the hot water utilization device , A water pump is provided between the return water pipeline and the hot water utilization device, and the hot water utilization device communicates with the industrial chiller.

Description

technical field [0001] The invention relates to a cold water cooling method and a nitrogen injection system for buried pipes in goafs of mines, which can more comprehensively solve the problems of heat damage and potential spontaneous combustion in goafs. Background technique [0002] With the continuous increase of the mining depth, the temperature of the original rock continues to rise, and the high temperature heat damage of the mining face is becoming more and more serious. At present, the average mining depth of state-owned coal mines in my country is about 680m, and the average original rock temperature at the production level is 35.9°C~36.8°C. In mines with a mining depth of more than 1000m, the original rock temperature is as high as 40°C~45°C, and the working face temperature reaches 34°C. ℃~36℃, most mines will enter the primary and secondary heat damage zone. In addition to stratum heating, the oxidative heating of coal left in the goaf will also form a high-tempe...

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Problems solved by technology

The third method is to cool down through low-temperature circulating water in coal seam boreholes. The latter two measures can achieve better results in solving the heat generation problem of coal mining machinery and the heat damage problem of the working face caused by the increase of mining depth, but These measures cannot solve the problem of oxidative heating of residual coal in goafs

[0004] In view of the above status quo and the deficiencies of the cooling system, it is of practical significance to study a more complete system that can solve the problems of goaf cooling and left coal self-heating and ignition.

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