一、地下火灾。到目前为止,在防止火灾方面虽做了很多努力,但,它所造成的经济损失是很大的(例如,造成设备和巷道损坏,造成产量和开拓煤量的损失),在救灾和恢复生产方面也需要付出很大代价,更重要的是威胁着人的生命安全。在美国的矿山工业中,采用的地下火灾分类法是:A 级火灾——其燃烧对象为煤、木材、胶皮和其他固体可燃材料;B 级火灾——其燃烧对象为可燃性液体;C 级火灾——为电气设备由于短路和发生电弧火花而引起的火灾。 First, underground fire. So far, much has been done to prevent fire, but the economic losses it causes are substantial (for example, damage to equipment and tunnels, loss of production and development of coal), and in disaster relief and recovery of production Also need to pay a very high price, more importantly, is a threat to human life and safety. In the mining industry in the United States, the classification of underground fires used is: Class A fires, which burn coal, wood, rubber and other solid combustible materials; Class B fires, which are flammable liquids; Class C Fire - A fire caused by electrical equipment due to short circuit and arc sparking.