关键词: 煤自燃温度演化规律, 函变关系, 防治措施

Abstract: Aiming at the problem of coal spontaneous combustion caused by air leakage in goaf of 2-1 coal seam working face in Menkeqing Coal Mine，through the combination of experiment and numerical sim‐ ulation，the variation law of low temperature oxidation characteristic temperature of coal body under differ‐ ent air leakage conditions and its correlation with oxygen concentration are studied. The simultaneous ther‐ mal analysis test of controlling carrier gas flow and oxygen concentration is used to simulate the conditions of oxygen supply and heat storage in goaf，and the influence of different air leakage intensity on the tempera‐ ture field and flow field in goaf is analyzed based on numerical simulation. The results show that the air leak‐ age intensity has little effect on the thermogravimetric curve of coal，but under the same oxygen concentra‐ tion，the heat dissipation effect of larger airflow will significantly delay the low temperature oxidation pro‐ cess of coal. The linear correlation between characteristic temperatures T1 and T2 and oxygen concentration is weak，while T3 and T4 decrease with the increase of oxygen concentration in a quadratic function. The nu‐ merical simulation shows that the high temperature area of the residual coal seam is mainly concentrated near the return air roadway，which is distributed in a triangular shape near the wall surface，and the in‐ crease of ventilation volume will lead to the migration of the velocity field and temperature field in the goaf to the deep. According to the research results，the fire prevention technology of gas monitoring strategy optimi‐ zation，air leakage prevention method innovation and the fire extinguishing method of injecting slurry，inert gas and gel foam material are put forward，which has important guiding significance for ensuring the safe mining of coal mines.

Key words: temperature evolution law of coal spontaneous combustion, interrelationship, prevention and control measures