用热棒技术强化煤堆降温幅度试验
发布时间：2019-05-07 23:00
【摘要】：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。
[Abstract]:In order to destroy the internal thermal storage environment of coal pile, effectively reduce the risk of coal spontaneous combustion and prevent coal pile from spontaneous combustion, based on the principle of heat transfer enhanced by closed steam-liquid two-phase flow of hot rod, a test and test system for heat transfer and cooling performance of coal self-ignition and extinguishing heat rod is constructed. The effect of thermal rod on the temperature distribution in coal heaps is studied. The distance between coal body and heat rod is closer, the cooling effect is more obvious, and the accumulated heat transfer and cooling capacity of the hot rod increase with the increase of time. The results show that under the test conditions, the highest temperature drop at each measuring point is 13.30, 9.80,7.70,6.70,4.50,3.20,1.50 and 0.50 鈩，
本文编号：2471428
[Abstract]:In order to destroy the internal thermal storage environment of coal pile, effectively reduce the risk of coal spontaneous combustion and prevent coal pile from spontaneous combustion, based on the principle of heat transfer enhanced by closed steam-liquid two-phase flow of hot rod, a test and test system for heat transfer and cooling performance of coal self-ignition and extinguishing heat rod is constructed. The effect of thermal rod on the temperature distribution in coal heaps is studied. The distance between coal body and heat rod is closer, the cooling effect is more obvious, and the accumulated heat transfer and cooling capacity of the hot rod increase with the increase of time. The results show that under the test conditions, the highest temperature drop at each measuring point is 13.30, 9.80,7.70,6.70,4.50,3.20,1.50 and 0.50 鈩，
本文编号：2471428
本文链接：https://www.wllwen.com/kejilunwen/anquangongcheng/2471428.html
