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首页> 外文会议>Progress in Safety Science and Technology vol.4 pt.A >An Experimental Study on Secondary Explosion of Coal Dust
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An Experimental Study on Secondary Explosion of Coal Dust

机译：煤尘二次爆炸实验研究

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The roles that dust layers play in dust explosions were investigated in a 58 m-long and 351 mm-diameter horizontal Flame Acceleration Tube (FAT) with two ends closed. One kind of coal dust, 13.22% (mass) in volatile and 23 μm (mean) in diameter, was layered on the bottom of the FAT. The overpressure of explosions was monitored at different locations along the FAT. The study demonstrated that the moisture content of the dust and the strength of the primary gas explosion are the factors that determine the severity of layered dust explosions. If the primary explosion is strong enough, the quasi-detonation of the low volatile coal dust even achieves. Obstacle in layered dust explosions plays an abnormal role relative to gas or pre-suspended dust explosion. Tertiary or fourth dust explosions can occur in 40 milliseconds behind the primary gas explosion. It can be explained by the irregular eddies resulting from obstacles.
机译：在两端封闭的58 m长，直径351 mm的水平火焰加速管（FAT）中，研究了粉尘层在粉​​尘爆炸中的作用。一种煤粉，其挥发物含量为13.22％（质量），直径为23μm（平均），位于FAT的底部。在FAT的不同位置监视爆炸的超压。研究表明，粉尘的水分含量和一次气体爆炸的强度是决定分层粉尘爆炸严重性的因素。如果一次爆炸足够强，则甚至可以实现低挥发性煤尘的准爆炸。相对于气体爆炸或预先悬浮的粉尘爆炸，分层粉尘爆炸中的障碍物起着异常的作用。三次或第四次粉尘爆炸可在一次气体爆炸之后的40毫秒内发生。可以用障碍物引起的不规则涡旋来解释。

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