不同变质程度煤尘爆炸特性对比分析

Comparative Analysis for Explosion Characteristics of Coal Dust with Different Metamorphic Grades

采用20L球形爆炸装置研究了煤尘浓度、点火能量、煤尘粒径对不同变质程度煤尘爆炸特性的影响,分析了不同变质程度煤尘在相同条件下的爆炸特性差异性。结果表明:浓度为100g/m3时不同变质程度煤尘最大爆炸压力相差较大,700g/m3时差异不大,最佳煤尘浓度下爆炸最大压力与变质程度呈负相关。低变质程度煤尘爆炸最大压力随点火能量增大而增大,高变质程度煤尘爆炸最大压力受低点火能量影响显著,当点火能量增大至8kJ后影响作用减弱。高变质程度煤尘的燃烧持续时间受点火能量影响作用明显,低变质程度煤尘的燃烧持续时间受粒径影响作用明显。

Using 20 L spherical explosive device,we investigated the influence of coal dust concentration,ignition energy and particle size on the explosion characteristics of different metamorphic grades coal dust,and analyzed the explosion characteristic difference of different metamorphic grades coal dust under the same conditions.The results showed that the maximum explosion pressure of different metamorphic grades of coal dust have large difference when concentration is 100g/m3,but the difference is little for 700g/m3; the maximum pressure and the metamorphic degree of coal dust is negative correlation under the best concentration.The maximum explosion pressure of low metamorphic grade coal dust increased significantly with the increase of ignition energy; the high metamorphic grade coal dust significantly influenced by the ignition energy,the influence weakened until the ignition energy increased to 8kJ.The burning duration of high metamorphic grade coal dust was affected by the ignition energy obviously.The low metamorphic grade coal dust burning duration is affected by particle size obviously.