采空区煤自燃引爆瓦斯的机理及控制技术

为有效防治高瓦斯易自燃矿井煤自燃引发瓦斯爆炸的难题，实验研究了CH₄与煤自燃火灾主要气体CO的混合气体的爆炸浓度范围及爆炸危险度，理论分析了煤自燃引爆瓦斯的可能发生区域和参与过程.结果表明，在高瓦斯易自燃矿井采空区内，当CH₄气体中混入大量CO，则混合气体的爆炸浓度上、下限的范围大大增加，爆炸危险度增大；同时，在煤自燃产生的火风压作用下，在发火区与非发火区之间不断形成CH₄,CO与新鲜空气的充分混合和热量的对流交换，导致瓦斯爆炸事故的发生.最后提出了采用大流量高品质的含N2三相泡沫来防治煤自燃引爆瓦斯的新技术.

Mechanism and restraining technology on spontaneous combustion of coal detonating gas in goaf

In order to prevent spontaneous combustion of coal detonating gas explosion, studied the explosion concentration range and explosion hazards resulted from mixed gases concluding CH4 and CO produced in fire gas, analyzed the potential explosion area and course of spontaneous combustion of coal detonating gas. The results show that the scope of explosion concentration and the risk of explosion increase in the goaf with spontaneous combustion of coal and high gas when CH4 gas mixed with a large number of CO. At the same time, fire heating air pressure produced by spontaneous combustion of coal results in the full mix of CH4, CO and fresh air and the convection exchange of heat between the combustion zone and non firing zone, occured the gas explosion accident. Finally, the large flux and high quality three phase foam was adopted to prevent spontaneous combustion of coal detonating gas.