基于SEM和IPP的煤尘爆炸固态残留物微观形貌特征分析
Analysis of micro morphology characteristics of coal dust explosion solid residues based on SEM and IPP
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摘要: 现有关于煤尘爆炸固态残留物形貌特征的研究多为定性研究，为了定量化研究煤尘爆炸固态残留物的形貌特征，采用20 L球形爆炸系统进行了褐煤、长焰煤、气煤和无烟煤的煤尘爆炸实验，运用扫描电子显微镜结合Image Pro Plus软件对固态残留物的形貌特征进行定量分析。结果表明：褐煤煤尘爆炸的最大爆炸压力和最大爆炸压力上升速率最大，燃烧持续时间最短；无烟煤煤尘爆炸的最大爆炸压力和最大爆炸压力上升速率最小，但燃烧持续时间最长；与原始煤尘相比，4种煤尘爆炸固态残留物颗粒直径分布范围均明显扩大；残留物在次高阶和高阶圆度区域内的颗粒数量均有所增多；形态分型维数也均有所增大；其中，无烟煤煤尘爆炸固态残留物在高阶直径区域内和高阶圆度区域内的颗粒数量占比最多，形态分布的分型维数最大；褐煤煤尘爆炸固态残留物在高阶直径区域内和高阶圆度区域内的颗粒数量占比最低，形态分布的分型维数也最小。Abstract: The existing research on the morphology characteristics of solid residues of coal dust explosion is qualitative. In order to quantitatively study the morphology characteristics of solid residues of coal dust explosion, the 20 L spherical explosion system was used to carry out the coal dust explosion experiments of lignite, long flame coal, gas coal and anthracite. The scanning electron microscope （ＳＥＭ） combined with Image Pro Plus software was used to quantitatively analyze the morphology of solid residue. The results show that the maximum explosion pressure and the maximum explosion pressure rise rate of lignite dust explosion are the largest, and the combustion duration is the shortest; the maximum explosion pressure and the maximum explosion pressure rise rate of anthracite dust explosion are the smallest, but the combustion duration is the longest. Compared with the original coal dust, the diameter distribution range of the solid residues of the four kinds of coal dust explosion is obviously expanded; the number of the residues in the sub high order and high order roundness regions is increased; the morphology fractal dimension is also increased. Among them, anthracite dust explosion solid residues in the high-order diameter region and high-order roundness region have the largest proportion of particles, and the fractal dimension of morphology distribution is the largest. The proportion of particles in thehigh-order diameter region and high-order roundness region is the lowest, and the fractal dimension of morphology distribution is also the smallest.
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