关键词: 低浓度瓦斯, 瓦斯抽采, 压缩空气, 循环脉冲, 疏堵增透

Abstract: It is the key of safe and efficient production to improve the extraction effect of gas extraction borehole. Based on the analysis of the reasons for the attenuation of gas concentration in the borehole, the mechanism of plugging and increasing permeability of high-pressure gas circulation pulse is studied, and a high-pressure gas circulation pulse plugging and increasing permeability device is developed. The field industrial test was carried out in No.12 coal mine of PingdingshanTian'an Coal Industry Co., Ltd. to establish a repeatedly acting pressurized and depressurized aerodynamic field in the extraction borehole, tear and destroy the coal slag blocking the borehole, and transport it out of the borehole. At the same time, depending on the hysteresis and tensile failure of the coal adsorption deformation, a new crack was formed in the coal around the extraction borehole and the gas flow was opened Moving channel. The results show that the technology of high pressure gas circulation pulse plugging and permeability enhancement has achieved the goal of improving the concentration and flow of gas extraction, and provided equipment and technical support for the safe and efficient production of coal mine.