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随着煤矿机械化水平的提高,在采掘工作面,煤尘和沼气的发生量都有不断增加的趋势。煤尘除了部分浮游于空气中外,更多的是以沉积煤尘的形式存在于井下。简单地计算,在一普通断面的巷道壁、底板表面,只要沉积有0.1～0.3毫米以上的煤尘,这些煤尘如因瓦斯爆炸、爆破、顶板垮塌、瓦斯突出等异常情况的冲击波或暴风而重新飞扬并浮游于空气中时,其煤尘浓度就可达到煤尘爆炸下限浓度值以上,而实际矿井中未经处理的沉积煤尘超过上述数值的地方是很多的。因此,沉积煤尘的存在有很大的潜在危险性。
With the improvement of mechanization of coal mines, the occurrence of coal dust and biogas tends to increase constantly in the mining face. In addition to part of the coal dust floating in the air outside, more in the form of deposited coal dust in the underground. Simply calculated, in a common section of roadway walls, floor surface, as long as the deposition of 0.1 ~ 0.3 mm above the dust, such as coal gas explosion, blasting, roof collapse, gas outburst and other abnormal shock wave or storm and When it is refilled and floats in the air, the concentration of coal dust can reach above the lower limit of coal dust explosion. Whereas the amount of untreated sediment dust in the actual mine exceeds the above value. Therefore, the existence of coal dust deposition has a great potential risk.