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为了掌握不同煤自燃特性参数对采空区“三带”分布的影响,利用煤氧化模拟实验系统对开滦集团钱家营矿、唐山矿、荆各庄矿9#、荆各庄矿11#四个煤样进行了绝热氧化实验。基于实验数据,对各煤样不同温度下的耗氧速率和放热强度进行了计算,并利用Fluent软件模拟不同煤自燃特性参数条件下采空区“三带”分布情况。结果表明,氧化带宽度最大的是唐山煤样80.3m,最小的是钱家营矿煤样24.2m。结合理论分析得出,耗氧速率越大,采空区“氧化带”的宽度越大,而放热强度大,一定程度上使“氧化带”范围增大。同时结合各煤样的最小自然发火期确定了相应煤层的最小推进速度,对于防治采空区自然发火具有重要作用。
In order to grasp the influence of different parameters of spontaneous combustion of coal on the distribution of “three belts” in the goaf, the simulation experiment system of coal oxidation was applied to simulate the coal deposits of Qianjiaying Mine, Tangshan Mine and Jinggezhuang Mine of Kailuan Group. 11 # four coal samples were adiabatic oxidation experiments. Based on the experimental data, the oxygen consumption rate and the exothermic intensity at different temperatures of each coal sample were calculated, and the distribution of the “three zones” of goaf under different coal spontaneous combustion parameters was simulated by Fluent software. The results show that the largest oxidation zone is the Tangshan coal sample 80.3m, the smallest is Qianjiaying mine coal samples 24.2m. The theoretical analysis shows that the larger the oxygen consumption rate, the larger the width of the goaf “oxidation zone” and the larger the exothermic intensity, to a certain extent, the “oxidation zone” increases. Combining the minimum spontaneous combustion period of each coal sample, the minimum propulsion velocity of coal seam is determined, which plays an important role in preventing spontaneous combustion in goaf.