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近年来,我国煤矿随着机械化程度的提高,矿井通风负压和开采强度的加大,煤炭自然发火的频率也在相应地增长.而目前我国煤矿对预防和扑灭井下火灾仍以黄泥灌浆为主,但由于此法存在着一定的局限性,已不完全适应综采工作面防灭火的需要,有待探寻新的防灭火方法.根据国外大量使用液氮或氮气防灭火的经验和国内已完成了模拟火灾液氮灭火试验的情况,为寻求将氮气直接用于煤矿井下防灭火的工艺,义马矿务局、
In recent years, with the increase of the degree of mechanization, the negative pressure of mine ventilation and the exploitation strength, the frequency of spontaneous combustion of coal also increases correspondingly.At present, coal mines in our country still use yellow mud grouting to prevent and extinguish the underground fire as However, due to the limitations of this method, the method has not fully adapted to the need of fire prevention and extinguishing of fully mechanized coal face, and new methods of fire prevention and extinguishment are yet to be explored.According to the experience of extensive use of liquid nitrogen or nitrogen in fire prevention and extinguishment in China, To simulate the fire liquid nitrogen fire test situation, in order to seek direct use of nitrogen gas fire extinguishing technology in the mine, Yima Mining Bureau,