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煤粉爆炸传播特性的试验研究对于深入了解和预防矿井煤尘爆炸事故有重要意义。利用自制的长29.6 m,内径199 mm的试验管道,对煤粉-空气混合物爆炸压力波传播过程进行试验研究。采用压电传感器测量压力信号,得到爆炸压力波沿管道传播过程中不同测点处的压力时间历程曲线,探讨煤粉粒度和浓度对其爆炸超压的影响规律。结果表明:煤粉-空气混和物在弱点火条件下能够实现粉尘火焰的形成和传播。煤粉爆炸压力波传播过程中速度为400~430 m/s,峰值超压为68~72 kPa。煤粉爆炸峰值超压随着煤粉粒度的减小而增大,但煤粉粒度对其爆炸峰值超压的影响程度随着浓度的增加将逐渐减弱。
Experimental study on propagation characteristics of pulverized coal explosion is of great significance for understanding and preventing coal mine dust explosion accidents in depth. The homemade pressure propagation of pulverized coal-air mixture was experimentally studied by using a self-made test tube measuring 29.6 m in length and 199 mm in inner diameter. Piezoelectric sensors were used to measure the pressure signals, and the pressure-time curves at different points during the propagation of the explosive pressure wave along the pipeline were obtained. The influence of the particle size and concentration of pulverized coal on the explosion overpressure was discussed. The results show that the pulverized coal-air mixture can form and spread the dust flame under weak ignition conditions. The velocity of pressure wave propagation in pulverized coal explosion is 400 ~ 430 m / s and the peak overpressure is 68 ~ 72 kPa. The peak overpressure of pulverized coal explosion increases with the decrease of pulverized coal particle size. However, the influence of pulverized coal particle size on the peak overpressure of pulverized coal will gradually decrease as the concentration increases.