外在水分对长焰煤孔隙结构及自燃特性的影响研究
Effect of external moisture on pore structure and spontaneous combustion characteristics of long-flame coal
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摘要: 为了研究煤体浸水后的孔隙结构和氧化自燃特征，将长焰煤制备成含水率为4%~20%的水浸煤，采用全自动比表面积分析仪和同步热分析仪分析原煤及水浸煤的孔隙结构特征和热失重规律，得到原煤及水浸煤的特征温度，并通过动力学分析计算出表观活化能。结果表明：随着煤中含水量的增多，煤比表面积和平均孔径逐渐增大，同时，高位吸附温度和干裂温度逐渐增大，即30~125 ℃内，水分对煤氧反应的抑制作用占主导地位；当温度超过125 ℃后，水浸煤的质量最大值温度和燃点温度均低于原煤；煤中水分蒸发，水浸煤的较大孔隙有利于氧气吸附，主要表现为促进作用，且含水率为12%的煤样的表观活化能最小，促进效果最佳。Abstract: To research the pore structure and oxidation spontaneous combustion characteristics of coal after water immersion, long-flame coal was prepared into water-soaked coal with water content of 4%-20%. Automatic specific surface area analyzer and simultaneous thermal analyzer were adopted to analyze the pore structure characteristics and thermal weight loss law of raw coal and water-soaked coal. The characteristic temperatures of raw coal and water-soaked coal were obtained, and apparent activation energy was calculated by kinetic analysis. Results indicated that with the increase of moisture in coal, the specific surface area and average pore diameter of coal gradually increased. Meanwhile, the high adsorption temperature and dry crack temperature gradually increased. In the range of 30-125 ℃, the inhibition of water on coal oxygen reaction was dominant. When the temperature exceeded 125 ℃, the maximum mass temperature and ignition point temperature of water-soaked coal were lower than that of raw coal, the water in coal evaporated, and the large pores of the water-soaked coal were conducive to oxygen adsorption, which was mainly manifested in the promotion effect. Meanwhile, the apparent activation energy of coal with water content of 12% was the smallest and the promotion effect was the best.
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