Abstract
Mine gas explosion seriously threatens the safety of coal mine production. Existing gas explosion control materials and technologies cannot effectively control the occurrence of gas disasters. Aiming at the current limitations of powder explosion suppressants in suppressing gas explosions in mines, this paper analyzes the special flame retardant and explosion suppression effects of nano powders from the suppression effect of free radicals in the explosion process based on the theory of surface effects of nano powders. The anti-explosion mechanism of nano-powder on mine gas, and the performance characterization parameters of nano-anti-explosion powder were proposed. In this paper, the self-improved 20 L near-spherical gas explosion suppression experiment system is used to perform the explosion suppression experiment of nanometer powder. The results of this study show that compared with micron-level powders, nano-powders have a better anti-explosion effect. The maximum explosion pressure and average rate of pressure rise of methane have decreased by 70.5% and 90%, respectively, and the peak time of explosion pressure has been extended by 3 times. Therefore, thenano-explosion suppressing powder material can suppress the gas explosion in the mine and can effectively control the occurrence of gas disasters.
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