Experimental study on starting condition and effect of active explosion proof for gas and coal dust explosion

In the China’s coal mines，the commonly used explosion control equipment is mainly passive isolation de⁃ vices such as isolation tanks and isolation water bags. However，due to the applicability and structural characteristics of the device，it is difficult to adapt to the development of intelligent and unmanned coal mines. The active explosion i⁃ solation and suppression technology has been widely used in the low concentration gas drainage pipelines，exhaust pipelines，and utilization terminals of coal mines in China due to its ability to realize active explosion control. Good re⁃ sults have been achieved，but it has not been widely applied in the coal mines due to the lack of corresponding techni⁃ cal specifications. In order to speed up the intelligent development of coal mine explosion control equipment，using a large roadway test system，on the basis of the research on the propagation law of gas-induced sedimentary coal dust ex⁃ plosion，based on the newly developed high energy active isolation device，the active isolation effect of gas and coal dust explosion was studied. Through the research，the change laws of key characterization parameters such as ex⁃ plosion pressure and explosion flame in the process of gas and coal dust explosion propagation were obtained. Based on the explosion propagation law and the performance characteristics of the active isolation device，the key technical parameters such as the installation position and the triggering threshold of the active isolation device were determined. The isolation effect of 100 m3 gas-induced sedimentary coal dust (laying position 14-70 m，coal dust concentration 150 g / m3 ) explosion was verified. The results show that the developed high energy active isolation device is stable and reliable，which can effectively isolate the gas-induced sedimentary coal dust explosion under certain conditions in coal mines. The study provides important theoretical and technical supports for the intelligent control of gas and coal dust explosion accidents in underground coal mines.