中文摘要：

介绍了三相泡沫的防灭火特征,分析了三相泡沫的覆盖效果和阻化特性,实验研究了三相泡沫扑灭多孔介质中的高位火源.结果表明,靠大流量的三相泡沫不断渗透、堆积和扩散,能将整个采空区完全覆盖,可防治采空区内任何位置的火源.根据矿井采空区及三相泡沫的特性推导出三相泡沫的扩散距离、注浆管出口离工作面的距离及连续注三相泡沫的时间.通过三相泡沫在大兴煤矿N2703综放工作面的实际应用,提出了向采空区预埋管注三相泡沫的方案,并成功地防治了该面的煤炭自燃.

英文摘要：

The characteristics of three-phase foam in mine fire control were introduced, its covering and inhibition were analyzed, and experiments on extinguishing the top fire in a porous medium were carried out. The results show that three-phase foam can cover the whole goaf and prevent everywhere fire by pervasion and accumulation. According to the characteristics of goaf and three-phase foam, technical parameters, such as diffused distance of three-phase foam, length between working face and pipe bottom and durative time for spontaneous combustion of coal, were deduced. Based on them, three-phase foam was applied in the workface N2 703 of Daxing coal mine in China, and laying pipes in advance in goaf was carried out. The effect of application shows that three-phase foam can successfully prevent spontaneous combustion of coal in the working face.