初始压力对矿井可燃性气体爆炸特性的影响

采用20 L近球型爆炸反应器对不同初始压力下矿井单元及多元可燃性气体的爆炸特性进行了实验研究，并结合碰撞理论和火焰传播机理对实验结果进行了理论分析。实验结果表明：初始压力增加使可燃性气体的爆炸危险性增强，但使其到达最大爆炸超压的时间略有延长；最佳浓度与爆炸上限之间的可燃性气体较最佳浓度与爆炸下限之间的可燃性气体对初始压力更敏感；相同的初始压力下，矿井多元可燃性气体较单元可燃性气体甲烷爆炸的危险性更高，破坏性更强。

Influence of initial pressure on explosion characteristics of flammable gases in coal mine

Explosion characteristics of mono component and multi component flammable gases in coal mine were studied by using a 20 L nearly spherical explosion reactor.The experimental results were theoretically analyzed through the collision theory and mechanism of flame propagation.The experimental results show that the explosive danger of flammable gases increases with the increase of initial pressure,but the time reaching the explosion peak overpressure is extended;the flammable gases between optimum concentration and upper explosion limit are more sensitive to initial pressure than that between optimum concentration and lower explosion limit.The explosion risk of multi component flammable gases is higher than that of methane under the same initial pressure and its explosion destructiveness is much stronger.