综采放顶煤开采方法的推广应用，在给煤矿带来工作面高产高效的同时，也给易自燃特厚煤层自燃火灾的防治带来了严峻的考验。特别是在易自燃特厚煤层开采中，采空区往往留有大量的松散遗煤，顶板冒落程度大，漏风严重，使得遗煤很容易与漏风流中的氧气发生氧化反应，从而导致采空区自燃火灾的发生，严重威胁矿工的生命安全和煤矿的安全生产。 本文以秦源煤矿N105综放工作面为工程背景，根据N105工作面的CO浓度变化，分析了N105工作面的自然发火过程和火区情况。确定了以高分子胶体和液态CO2灭火技术为主的降温措施，以注氮、注液态CO2为主的降氧措施，以高分子胶体隔离为主的堵漏措施，并采用封闭火区，通过措施巷向采空区开展防灭火工作的整体思路。 采集秦源煤矿N105工作面煤样，分别用高分子胶体材料、N2和CO2对煤样进行处理，然后进行程序升温实验，分析得出：N2对低温阶段烷烯烃生成的惰化效果明显；CO2对高温阶段耗氧速率、CO的产生惰化效果更明显；整体对比而言，高分子胶体对于抑制CO、耗氧速率及烷烯烃的产生效果更加明显。 在正常生产期间，对N105工作面的自然发火进行了“三带”观测，得出工作面架后采空区15m范围内为散热带，15~60m范围为氧化升温带，60m以上为窒息带。结合周边煤矿的自然发火资料和采煤工艺，得出进、回风侧临近20m内、压裂的煤柱、废弃的钻孔、“两道”和“两线”五处为自燃危险区域和防灭火工作的重点，为N105工作面火区启封后恢复生产期间的防灭火工作提供了参考。 综合程序升温实验和现场自燃“三带”划分，确定了合理的注氮位置、迈步式注氮间距以及N105工作面火区治理具体方案。通过对该工作面火区的治理，验证了液态CO2和高分子胶体的降温性能，并验证了高分子胶体的阻化和堵漏效果。实际工程证明，对于大范围高温火区，高分子胶体和液态CO2技术具有很好的降温效果，对于同类大范围高温火区提供了宝贵的经验。

The application of fully mechanized top coal caving mining method has brought a severe test to the working face with high efficiency and high efficiency of the working face. Especially in the extra-thick spontaneous combustion coal mining, the mined-out area is often left with a large amount of loose coal, and the degree of caving is serious and the air leakage is serious, which makes it easy to oxidize the oxygen in the air leakage The spontaneous combustion of the air area seriously threatens the life safety of the miners and the safe production of the coal mines. Based on the change of CO concentration in N105 face, the spontaneous combustion process and fire area N105 working face are analyzed in this paper. The measures of reducing the temperature of the macromolecule colloid and the liquid carbon dioxide fire extinguishing technology were carried out. The measures of nitrogen reduction and liquid carbon dioxide as the main measures were put forward, and the plugging measures based on the colloid isolation were adopted, and the measures were adopted Lane to the goaf to carry out fire prevention work as a whole. The results show that the effect of N2 on the formation of alkane in low temperature stage is obvious. The effect of CO2 on the formation of alkane in the low temperature stage is obvious. The results show that the effect of N2 on the formation of alkane in the low temperature stage is obvious. The oxygen inoculation rate and CO production in the high temperature stage are more obvious. In general, the effect of high molecular colloid on the inhibition of CO, oxygen consumption rate and alkane production is more obvious. On the N105 face spontaneous fire scene "three belt" observation, found that the face of the rear 15 meters within the non-spontaneous combustion zone, 15 to 60 meters for the oxidation of spontaneous combustion, 60 meters above the choking zone. Combined with the nearby coal mine spontaneous combustion data and coal mining technology summary to determine the inlet and return side of the vicinity of 20m, fractured coal pillars, abandoned drilling, "two" and two lines "five for the spontaneous combustion of dangerous areas and fire The focus of the work. The combination of nitrogen injection and the spacing of nitrogen injection and the fire control scheme of N105 surface were determined by the combination of temperature programmed experiment and the spontaneous combustion of the "three zones". Through the treatment of the working area, the liquid carbon dioxide and Polymer colloid material cooling performance, and verify the polymer colloid material blocking and plugging effect, the actual project proved that for a wide range of high temperature fire zone, polymer colloid and liquid carbon dioxide technology has a good cooling effect, for the same Large range of high temperature fire area provides valuable experience.