矿井瓦斯煤尘爆炸传播实验研究

煤矿中瓦斯爆炸容易引起煤尘参与爆炸,且掘进工作面是瓦斯煤尘爆炸事故的多发区域。在与实际矿井环境、几何条件相似的大型地下试验巷道中,进行了独头巷道瓦斯煤尘爆炸火焰、冲击波传播试验。试验中,瓦斯煤尘爆炸火焰到达各测点的时间与测点距离呈对数函数关系;爆炸火焰的传播速度在铺有煤尘段迅速上升,过了煤尘段开始下降;火焰区长度约为煤尘区长度的2倍;爆炸冲击波压力在铺有煤尘段前端降到最低值,然后迅速上升到最大值后下降。实验结论为煤矿隔抑爆装置的研制和安装提供了理论基础。瓦斯煤尘爆炸与单纯瓦斯爆炸相比,最大爆炸压力峰值大,火焰传播速度快;瓦斯煤尘爆炸的威力和破坏程度,要远远大于单纯瓦斯爆炸。因此,在煤矿实施防尘降尘技术,具有十分重要的意义。

Experiment study on the propagation laws of gas and coal dust explosion in coal mine

In the coal mine,gas explosion can stimulate coal dust participating in explosion and the accident of gas and coal dust explosion usually happens in the heading face.The experiment of gas and coal dust explosion propagation in the alone laneway is carried out in the large experimental roadway which is nearly equal to the fact with actual environment and geometry condition.In the experiment,the time when gas and coal dust explosion flame reaches test points has a logarithm function relation with the test point distances.The explosion flame propagation velocity rise rapidly in the foreside of coal dust segment and come down after that.The length of flame area is about 2 times than that of original coal dust accumulation area.Shock wave pressure comes down to the rock bottom in the coal dust segment,then appears the maximum peak rapidly and comes down.The theory basement of research and assemble of across or explode is supplied by the experiment conclusion.Comparing with gas explosion,the force and destroy degree of gas and coal dust explosion is over larger.Therefore,it is very meaningful for implement of dust fall and prevention technology in the coal mine.