崔木煤矿21305工作面位于崔木煤矿北翼21盘区东部，采用走向长壁式后退采煤法，综采放顶煤开采，全部垮落法管理顶板，煤层开采厚度 9m，其中机采厚度 3.5m，放顶煤厚度5.5m，煤层属于低灰低变质烟煤，煤自燃倾向性鉴定为一类容易自燃，在工作面停采撤架期间，由于采空区遗煤多，漏风量大等因素采空区遗煤极易发生自然发火现象，与305工作面同处3#煤的302工作面于2014年2月停采期间发生了煤自燃现象，被迫封闭工作面，因此研究21305工作停采撤架期间防灭火技术尤为关键。 本文利用煤自然发火模拟实验模拟采空区煤层自然发火过程，得出煤自然发火过程中煤自然发火的特征温度和气体表征、煤自然发火的极限参数以及最短自然发火期。应用数值模拟的方法结合崔木矿实际情况划分302工作面停采撤架期间采空区的煤自燃危险区域，并结合现场发火情况验证模拟的有效性，应用同样的方法模拟305工作面的自燃危险区域，依据煤自燃危险区域制定出停采撤架前注氮，灌浆，端头封堵，监控检测的防灭火措施；停采撤架期间，降低风压，采空区钻孔注复合胶，架后煤层钻孔注凝胶处理等防灭火措施。根据检测效果可以看出，灌浆，注氮，降低风压，端头封堵等措施对预防煤自燃效果明显，架间注高分子胶体对重点防治效果显著，305工作面停采撤架39天后成功撤离。

Cuimu coal mine 21305 working face is located in the north east wing panel 21 Cui Mu coal mine, adopts to the long wall backward coal mining method, mining of fully mechanized caving coal face, the whole management of roof caving method, mining coal seam thickness of 9 m, machine mining thickness of 3.5 m, the caving thickness of 5.5 m, belong to low ash and low metamorphic bituminous coal, coal self-ignition orientation identification for a class of easy spontaneous combustion of coal seam, stop at working face mining took 38 days, because of traces of goaf coal, leakage air volume big coal spontaneous combustion phenomena, factors such as goaf easily happened The 305 workingface adjacent to the 302 working face had got spontaneous combustion in February 2014 during 38 days of dismantling Supports. so the studying of comprehensive fire prevention and control technology during dismantling supports of Cuimu coal mine is particularly critical. This paper, by using simulated coal spontaneous combustion experiment simulating working face coal natural fire, it is concluded that the temperature of the coal spontaneous combustion characteristics and gas characterization, the limit parameters of coal spontaneous combustion, and the shortest spontaneous combustion period. Use of the method of numerical simulation in combination with the practical situation of Cui Mu ore divided 302 face stopped mining goaf of coal spontaneous combustion dangerous area during the shelves, and combined with field verify the validity of the simulated firing conditions, the same method is applied to simulate the 305 working face of spontaneous combustion dangerous area, on the basis of coal spontaneous combustion dangerous area to develop a stop by nitrogen injection before the shelves, grouting, the end block, monitoring to detect fire prevention measures; Stop during mining the shelves, reduce wind pressure, goaf note compound plastic drilling, drilling of coal seam injection gel after processing such as fire prevention measures. According to the application of test results can be seen, grouting, nitrogen injection, and lower air pressure, end seal measures for preventing coal spontaneous combustion effect is obvious, such as frame between polymer gel injection to focus on prevention and control effect is remarkable, 305 workface successfully evacuated in 39 days during dismantling supports.