论文部分内容阅读
矿井火灾是煤矿的重大灾害之一,它不仅能使矿井遭受巨大的物质损失,同时也导致井下矿工的死亡。煤矿井下自燃以采空区最为严重,自然发火次数占火灾总数的60%,所以防治采空区自然发火对防治煤矿自燃事故具有非常重要的意义。静水平煤层采用灌浆、喷洒阻燃剂等措施对采空区进行防灭火存在很大的缺陷,注氮惰化采空区效果明显且合理。推导粗略得到了注氮量和注氮浓度对煤氧化产生的热量及采空区最高温度的关系,说明了其定性关系和注氮防灭火的基本原理。通过数值模拟注氮后采空区内部多物理量时空演化规律,优化采空区注氮参数,并给出注氮工艺,提高注氮防灭火效果。
Mine fire is one of the major disasters in the coal mine, which can not only make the mine suffered huge material losses, but also lead to the death of underground miners. Spontaneous combustion in coal mines is the area with the most serious gob and the number of spontaneous combustion accounts for 60% of the total number of fires. Therefore, it is of great significance to prevent and control spontaneous combustion in goafs. Static horizontal coal seam using grouting, spraying flame retardants and other measures to go fire prevention and extinguishing the mined area there is a big flaw, nitrogen injection gushed inertia gob effect is obvious and reasonable. The relationship between the amount of nitrogen injection and the concentration of nitrogen injection on the heat generated by coal oxidation and the maximum temperature of the goaf was obtained. The basic principle of the relationship between the amount of nitrogen and the nitrogen injection was described. The numerical simulation of spatiotemporal evolution of multiphysics inside the gob area after nitrogen injection was carried out to optimize the parameters of nitrogen injection in the goaf, and the nitrogen injection process was given to improve the fire prevention effect of nitrogen injection.