摘要
在竖直长管内进行弱点火条件下甲烷—煤粉复合爆炸实验,研究了甲烷煤粉配比浓度、煤粉粒径、点火延迟时间等初始状态参数对复合爆炸特性的影响。结果表明:火焰传播越快,压力上升越显著,最大压力上升速率出现在爆炸初期,当火焰传播至管末端后,压力达到最大值;低浓度甲烷添加煤粉后,爆炸压力显著增大;煤粉粒径越小,复合爆炸压力越大,压力上升速率越大;最大爆炸压力和最大压力上升速率随着煤粉浓度增大和点火延迟时间增加先上升后下降,存在峰值点。
Experiments of methane-coal dust compound explosion with low ignition energy were carried out in a 1.2 m long vertical tube.Study was made on the influence of different initial state parameters including methane ratio of coal dust concentration,coal dust particle size and ignition delay time upon the compound explosion characteristics.The results showed that the explosion pressure rose significantly with the speed-up of flame propagation,the maximum explosion rise rate appeared at the initial stage of the explosion and it reached the maximum value when flame propagated to the end of the tube;after the coal dust was added into low concentration methane,the explosion pressure markedly increased;the smaller the coal dust particle size,the larger the compound explosion pressure and the faster the explosion pressure rose;the maximum explosion pressure and the pressure rise rate increased first and then decreased with coal concentration and ignition delay time,so a peak point existed.
出处
《矿业安全与环保》
北大核心
2010年第6期1-4,共4页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(50076006)
教育部科学技术攻关重点项目(106054)
