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为了分析水分对露天煤堆自燃升温速率的影响,建立了二维含水煤堆传热传质数学模型,利用FLUENT软件对煤堆内部氧气、水分和温度场信息进行计算推演。计算结果表明:含水煤堆升温过程经历了升温-缓慢升温-快速升温3个阶段,煤堆内水分与之对应经历了缓慢蒸发,快速蒸发和蒸干3个阶段。水分的存在使煤堆在自燃中期升温速率放缓,水分含量越高,水分蒸发所需时间越长,煤堆安全保存期越长。煤堆水分含量与安全保存期程强烈指数函数关系。
In order to analyze the influence of moisture on the rate of spontaneous combustion of open coal piles, a mathematical model of heat and mass transfer for two-dimensional water-bearing coal heaps was set up. The information of oxygen, moisture and temperature in the coal piles was deduced by using FLUENT software. The calculation results show that the water temperature of coal-bearing water heaps undergoes three stages: temperature rising, slow warming and rapid warming. Correspondingly, water in the coal pile experiences three stages: slow evaporation, rapid evaporation and dry evaporation. The existence of moisture makes the coal pile slow down in the middle of spontaneous combustion. The higher the moisture content, the longer the water evaporates, and the longer the shelf life of the coal pile is. Coal moisture content and the safety of the strong exponential function of the relationship.