管道瓦斯爆炸抑爆减灾方法研究

Research on explosion suppression and disaster reduction methods of pipeline gas explosion

为削弱矿井巷道内瓦斯爆炸带来的不良影响,搭建了管道瓦斯爆炸平台,再现矿井巷道瓦斯爆炸过程,耦合泄压与惰化机制来探索爆炸火焰扑灭的方法。研究表明,管道阻爆关键在于形成阻爆区域所需时间与火焰到达阻爆区域所需时间的竞争。火焰传播至泄压口前,受侧向泄压影响火焰前锋处压力差△p增大、未燃区域可燃气浓度降低,两种作用相反致使火焰传播速度差值较小,仅为0.6m/s。经过泄压口后,△p与可燃气浓度均降低,火焰传播速度从4.8m/s降低至0.5m/s,降低了89.5%,实现了火焰传播速度的大幅减速,火焰传播时间大幅延长。此时,喷入氮气致使燃烧链式反应的链引发、链传递受阻,链终止增强,直至链终止速率大于链传递速率,仅有零星火焰也被熄灭,实现阻爆效果。

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 △p 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,△p,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 antiexplosion effect.