美国矿业局为弄清薄层悬浮煤尘落在相当厚的岩粉与磨碎的煤尘混合层上时发生爆炸危险的特性,已在布鲁斯顿实验矿井完成了一系列试验,以测定沉积在厚的煤尘—岩粉混合层上部及薄的纯岩粉层上的一薄层细煤尘的燃烧性极限值。试验表明:仅底板粉尘层上部2～4mm 厚的煤尘火焰传播中起关键 In order to understand the danger of explosions when thin-layer suspended coal dust falls on a relatively thick layer of mixed ground rock dust and ground coal dust, the United States Department of Mines has completed a series of tests at the Brewmaster Experimental Mine to determine the extent of deposition Burning limit of a thin layer of fine coal dust on the upper part of thick coal dust - rock powder mixed layer and thin pure powder layer. Tests show that: only the upper layer of dust layer 2 ~ 4mm thick coal dust flame propagation in the key