Method for storing gas by using abandoned tunnel

Abstract

The invention provides a method for storing gas by using an abandoned tunnel. The method comprises the following steps of: 1) building a closed wall on an exit of the abandoned tunnel to ensure that the tunnel is completely isolated from the external; 2) arranging a gas inlet pipeline in the closed wall of at least one exit of the tunnel; 3) connecting a pipeline for extracting gas and the gas inlet pipeline on the inner side of the closed wall by using a first flame arrestor on the outer side of the closed wall; and 4) arranging a gas outlet pipeline in the closed wall of the at least one exit of the tunnel. The very large closed space of the underground abandoned tunnel is used as a temporary gas storing and mixing device and flow adjustment is realized through storage, the concentration adjustment is realized by mixing gases with different concentrations, and a stable and reliable gas source is provided for equipment using the gas, such as a low-concentration gas power generation device and the like; meanwhile, gas utilization rate of shaft extraction is improved to the maximum extent, the mode of supplying the gas when the gas is lacked of the shaft extraction is realized and the gas is used as much as the gas is extracted.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to the field of gas utilization in coal mining. Background technique [0002] In the process of coal mining, a large amount of gas in the coal seam flows into the mining space, and mine ventilation is one of the basic means of gas control to remove mine gas. Such a large amount of gas is discharged to the atmosphere with the main ventilator of the mine, which causes great pollution to the atmospheric environment while wasting precious gas energy. [0003] In the process of coal mining, it is very important to extract and utilize coal seam gas and prevent gas from causing damage to the atmospheric environment. [0004] At present, there are mainly three technical solutions for gas utilization: high-concentration gas purification technology, low-concentration gas power generation technology, and mine ventilation gas countercurrent reactor technology. [0005] 1) High concentration gas pur...

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Problems solved by technology

[0013] It can be seen that the existing technical solutions all have the disadvantage that the requirements of gas utilization equipment for the gas used and the actual gas provided by mine drainage cannot be coordinated:

During this part of the gas drainage, due to the low resistance of the drainage port, the total flow rate of the gas mixture is relatively stable, but the concentration changes greatly. Sometimes it is affected by the frequent adjustment of the drainage system, such as the continuous change of the buried pipeline in the goaf, and the periodicity of the roof. Influenced by caving, the concentration is between 5% and 30%, and the concentration changes greatly and quickly. Sometimes the drainage stops in a short period of time or the gas volume changes greatly due to the continuous change of drainage, which will generate electricity for low-concentration gas. It brings great difficulties. If the concentration is low, it needs to be shut down. When the concentration is high, it needs to be diluted with supplementary air. When the gas extraction volume is large, the excess volume must be released.

[0016] It can be seen that in order to solve the contradiction that the gas extraction volume and extraction concentration cannot be stabilized for a long time, and the demand for gas from the gas utilization equipment is not consistent, it is necessary to provide a method for storing gas to improve the utilization rate of mine drainage gas , and provide a stable and reliable gas source for the gas utilization device

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