受限空间煤尘爆炸毒害气体传播伤害研究

Study on Dissemination Injury of Poisons Gas from Coal Dust Explosion in Confined Space

为减少煤矿煤尘爆炸后毒气对人的危害,为煤矿防爆、抑爆和安全评价,以及事故应急救援等提供理论依据,研究了煤尘爆炸后毒气的传播伤害规律。基于质量守恒定律与空气动力学理论,建立煤尘爆炸后风流作用下的毒害气体在受限空间内的数学传播模型,得到巷道内毒气传播的弥散系数,计算出沿爆炸传播方向毒气浓度随距离变化的关系,划分伤害三区并推导出相应的伤害范围计算公式。研究表明:毒气传播的峰值点随风流方向移动,其峰值点浓度逐渐变小。

For providing theoretical basis for reducing toxic gas hazard of coal dust explosion to human,mine explosion-proof,explosion suppression and safety evaluation,as well as emergency and rescue,the spread and damage law of toxic gas after coal dust explosion is studied. Based on the law of conservation of mass and Aerodynamics,a mathematical propagation model for toxic gases after a coal dust explosion under the action of airflow in the confined space is established,and the diffusion coefficient of toxic gas spreading inside the tunnel is obtained. Then,the changing relation of gas concentration with the distance along the explosion propagation direction is calculated; three areas of damage are divided and corresponding damage range calculation formulas are derived. The results show that the peak point of toxic gas propagation moves with the direction of flow,and the concentration at the peak point becomes smaller gradually.