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利用澳大利亚昆士兰大学的2m煤自燃发火实验炉,历时5 d,模拟了煤样从常温至160℃着火点的煤自燃全过程,掌握了煤自燃高温点的发生、发展及动态变化过程.实验中能清晰了解煤样温度和水蒸气的变化发展过程.在实验开始阶段,实验炉上部煤样的温度发展是由于空气的通入,将水蒸气和热量从下部带到上部,导致上部温度升高,高温点逐渐上移到145 cm处.2d后,高温点开始向下移动,这主要是由于煤样下部已经完全干燥,煤样在完全干燥及本身高温的情况下,温度会很快升高直至达到着火点.高温点最终发展在60 cm处.同时,在煤样达到着火点的前期,温度上升速率达到120℃/d.实验得出亚烟煤的发火时间为5d,这与煤矿的现场观测结果一致.
Using the 2m coal spontaneous combustion experiment furnace of the University of Queensland, Australia, the whole process of spontaneous combustion of coal from the normal temperature to 160 ℃ ignition point was simulated for 5 days, and the occurrence, development and dynamic change process of coal spontaneous combustion point were simulated. A clear understanding of the temperature and water vapor of coal-like process of development.In the beginning of the experiment, the upper part of the experimental furnace temperature of coal samples is due to the introduction of air, the water vapor and heat from the lower part of the upper part, leading to the upper part of the temperature, The hot spots gradually moved up to 145 cm, and after 2 days, the hot spots began to move downwards, mainly due to the complete drying of the lower part of the coal sample, the temperature of the coal sample rapidly rising until it completely dried and its own temperature Reached the ignition point.High temperature point eventually developed at 60 cm.At the same time, in the pre-ignition point of the coal sample, the rate of temperature rise reached 120 ℃ / d.The experiment shows that sub-bituminous coal has an ignition time of 5 days, which is consistent with the results of the on-site observation in coal mines .