甲烷煤尘耦合爆炸传播特性及伤害研究

Research on pressure propagation and injury of methane and coal dust coupled explosion

为探究煤尘质量浓度对甲烷煤尘耦合爆炸传播特性及伤害距离的影响,自制长15 m的爆炸管道系统,用体积分数为7%甲烷分别与质量浓度为0、50、100和200 g/m^(3)的煤尘进行耦合爆炸试验,并根据质量、动量和能量守恒理论推导出最大压力计算公式。结果表明:不同质量浓度煤尘与甲烷耦合爆炸时,最大压力均随与爆源距离的增加呈现出先减小再增加最后逐渐减小的趋势;随着煤尘质量浓度增加,爆炸腔内最大压力先增加后减小;传播管道内最大压力随煤尘质量浓度的增加而增大,且最大压力与距爆源距离的平方根成反比。依据超压准则划分的死亡、重伤和轻伤距离均随煤尘质量浓度的增加而增加,轻伤距离随煤尘质量浓度变化的波动范围最大,死亡距离波动最小。

In order to study influence of coal dust's mass concentration on propagation and injury distance of methane and coal dust coupled explosion,a self-made 15m explosion pipeline system was used for an experiment where 7%methane and coal dust at different mass concentration(0,50,100 and 200 g/m^(3))had coupled explosion.Then,maximum over-pressure calculation model was derived from conservation laws of mass,momentum and energy.The results show that in coupled explosion,the maximum over-pressure decreases at first and increases and then decreases gradually along with the increase of distance from explosion source.As mass concentration of coal dust increases,the maximum over-pressure in explosion cavity first increases and then decreases,while that in propagation pipeline increases with it,and is inversely proportional to the square root of distance from explosion source.Moreover,distances of death,serious injury and minor injury all increase with the increase of dust concentration whose change has the greatest impact on distance of minor injuries and the least on that of death.