瓦斯对煤尘爆炸特性影响的实验研究

瓦斯的存在对煤尘爆炸特性的理论计算和数值仿真的结果与实际数据有一定差距,因此,通过不同浓度瓦斯与煤尘共存条件下爆炸实验研究,得出了矿井瓦斯对煤尘的最低着火温度、最小点火能量、爆炸下限浓度、最大爆炸压力和最大爆炸压力上升速度等爆炸特性影响的规律即瓦斯对煤尘最低着火温度影响不大;瓦斯可使煤尘的最小点火能量减小,尤其是对难于点燃的煤尘;混合物的爆炸下限浓度随瓦斯浓度的增加而降低;混合物的最大爆炸压力上升速度由于瓦斯的存在而增强,而最大爆炸压力几乎没有变化。同时研究了瓦斯对无爆炸性煤尘的影响。实验研究的结论对于现场防止煤尘爆炸的发生具有指导意义。

Experimental Research on the Influence of Gas on the Character of Coal Dust Explosion

There are some differences between the results of coal dust explosion characters obtained by theoretical calculation and numerical simulation and the actual data because of the existence of gas in coal dust. An experimental research on explosion was conducted under the condition of coexistence of coal dust and gas with different concentration so as to obtain the affecting rule of gas on coal dust explosion characters such as minimum ignition temperature, minimum ignition energy, lower explosive limit, maximum blast pressure and the ascensional velocity of blast pressure. Experimental result shows the existence of gas has little infulence on the lowest ignition temperature of coal dust, but it can lower the minimum ignition energy of coal dust, particularly that of nonflammable coal dust; the lower explosive limit of mixture will decrease with the increase of gas concentration; the ascensional velocity of maximum blast pressure of mixture will rise due to the existence of gas, but maximum blast pressure is almost unchangeable. In addition, the influence of gas on non-explosive coal dust is also researched.