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在英国煤矿中大部分火灾事故是由于采煤机的截齿割到石英岩产生摩擦热引燃瓦斯而造成的。英国矿山安全研究所安装了一台大型实验室岩石切割机,试验截齿引燃瓦斯的实际切割速度。 当切割速度大于1.25米/秒时,通过降低切割速度的方法来减少瓦斯引燃可能性不大。但是,进行有效的喷水却能延长引燃时间。通过对喷水参数的研究,如岩石单位面积上的喷水量、雾滴的平均大小、总喷水量和雾滴速度等,得出了引燃时间、雾滴大小、喷雾密度、雾滴速度等诸参数之间的经验关系,并利用这些关系来选择喷咀。
Most of the fire accidents in coal mines in the United Kingdom were caused by the frictional heat induced by the cutting of coal shearer’s cutters to quartzite. The British Institute of Mine Safety installed a large laboratory rock cutting machine to test the actual cutting speed of the pilot’s burnt gas. When the cutting speed is more than 1.25m / s, reducing the cutting speed by reducing the gas ignition is unlikely. However, effective water spray can extend the ignition time. Through the study of water parameters, such as the amount of water spray per unit area of rock, the average size of the droplet, the total water spray and the droplet velocity, the ignition time, droplet size, spray density, Speed and other parameters of the empirical relationship between, and use these relationships to select the nozzle.