Abstract:  In order to weaken the adverse effects of gas explosion in mine roadway, a pipeline gas explosion platform was built to simulate the gas explosion process of mine roadway, and the method of extinguishing explosion flame was explored by coupling pressure relief and inerting mechanism. According to studies, the key to pipeline detonation is the production of detonation resistance to the time required to construct the region and the flame to reach the time required to compete. Flame propagation to the pressure relief port occurs before the lateral pressure relief influence flame front. As the pressure difference Δp increases, the concentration of unburned regional gas decreases, resulting in a small difference in flame propagation speed, 0.6 m/s. After the pressure relief port, Δp, and gas concentration are reduced, the flame propagation speed is reduced from 4.8 m/s to 0.5 m/s, a reduction of 89.5%, resulting in a significant slowing of the flame propagation velocity and a large extension of the flame propagation time. In this process, the chain initiation and chain transfer of the combustion chain reaction are blocked, and the chain termination is enhanced until the chain termination rate is greater than the chain transfer rate, and only sporadic flames are extinguished to achieve the anti-explosion effect.

Key words:  methane, nitrogen, pressure relief, explosion suppression, flame extinguishing