激波诱导下煤粉的爆炸压力测试

因气体爆炸导致沉积粉尘的二次爆炸的威力远大于单纯的气体或者粉尘爆炸产生的威力,利用自制的装置,诱导煤粉爆炸的激波由甲烷气体爆炸产生,对激波诱导下煤粉的爆炸压力Pmax、爆炸压力上升速率(dp/dt)max进行了实验研究。该实验分别研究煤粉浓度及煤粉粒度对爆炸指数的影响,其结果表明:对于不同的煤粉浓度,存在一个理想煤粉浓度值,在这个浓度下的煤粉爆炸压力值最大;随着煤粉粒度的减小,其爆炸压力不断升高。

Explosion Pressure Testing of Coal Dust Inducted by Shock Wave

The damage of secondary dust explosion is seriously greater than that of pure gas explosion or dust explosion. The coal dust explosion pressure P_ max and pressure rise rate(dp/dt)_ max were tested in a self-made device,where shock wave was produced by methane gas explosion. The effect of coal dust density and coal dust particle size on characteristic parameters was determined. It indicates that there is a suitable coal dust density value at which the coal dust explosion pressure is the maximum one. The smaller the particle size of coal dust is,the greater the explosion pressure is.