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为破坏煤堆内部蓄热环境,有效降低煤自然发火的危险性,预防煤堆自燃,基于热棒闭式汽-液两相流强化热传导原理,构建煤自燃防灭火热棒移热降温性能试验测试系统,研究煤堆升温过程中热棒对其内部温度场分布的影响效果。热棒对煤堆自燃升温过程具有较明显的抑制降温效果,煤体与热棒距离越近,降温效果越明显;热棒的累积移热量和降温能力随时间的增加而不断增大。结果表明,试验条件下,煤堆内部各测点最高降温依次为13.30,9.80,7.70,6.70,4.50,3.20,1.50和0.50℃,对应温度降幅依次为29.00%,23.90%,24.70%,19.40%,16.00%,13.50%,8.90%和3.87%,平均降温速率分别为1.20,0.90,0.70,0.62,0.39,0.29,0.16和0.11℃/h。
In order to destroy the internal heat storage environment in coal mines, effectively reduce the danger of spontaneous combustion of coal and prevent the spontaneous combustion of coal piles, the heat transfer and cooling performance of coal self-ignition fire-extinguishing hot rods Test system to study the influence of the hot rod on the temperature field distribution inside the coal pile during the warming process. The thermal bar has a significant effect of suppressing the temperature drop during spontaneous combustion of coal piles. The closer the distance between the coal body and the hot bar, the more obvious the cooling effect is. The cumulative amount of heat transfer and cooling capacity of the hot bar increases with time. The results showed that under the experimental conditions, the maximum temperature drop at each measuring point was 13.30, 9.80, 7.70, 6.70, 4.50, 3.20, 1.50 and 0.50 ℃, respectively, corresponding to 29.00%, 23.90%, 24.70% and 19.40% , 16.00%, 13.50%, 8.90% and 3.87%, respectively. The average cooling rates were 1.20, 0.90, 0.70, 0.62, 0.39, 0.29, 0.16 and 0.11 ℃ / h, respectively.