点火延时对褐煤粉尘爆炸特性的影响OA北大核心

There is an undeniable safety hazard of coal dust explosion in the coal processing process.Ignition ex-periment of lignite dust under different ignition delay times was carried out using a Hartmann tube device,and the ignition critical characteristics of coal dust were studied.Based on the variation characteristics of the minimum ignition energy,the morphological features and propagation laws of flame caused by coal dust explosion under different ignition delay times were explored.The diffusion dynamic characteristics of coal dust were analyzed by combining experimental results with numerical simulations.The results show that the minimum ignition energy of coal dust decreases first and then increases with the in-crease of ignition delay time.When the ignition delay time is 90 ms,the minimum ignition energy of coal dust reaches 244 mJ.At an ignition energy of 1 280 mJ and an ignition delay time of 90 ms,the flame reaches its peak brightness,manifes-ting as a mushroom cloud with the highest flame front.The experimental and simulation results demonstrate that the dust dispersion is good around an ignition delay time of 90 ms.