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煤矿的外因火灾是由于明火、电火花、放炮、机械摩擦火花等外部热源引燃煤体、木料、建筑物、皮带、油类、瓦斯等可燃物造成的火灾.据统计,我国煤矿的外因火灾约占矿内火灾的25～30%.随着矿井机械化、电气化程度的提高,外因火灾的比例也在增大.目前,发达国家煤矿的外因火灾所占比例大多超过50%.外因火灾的危害甚大,特别是井下的外因火灾大多发生在井下风流畅通的地点,如果发现不及时或者灭火方法不当,火势发展很快,生成大量的有毒有害气体(一氧化碳、二氧化碳等),严重威胁井下人员的生命安全和财产安全,造成严重后果.所以,必须十分重视外因火灾的预防与扑灭.
External fires in coal mines are caused by igniting flames, electric sparks, blasting, mechanical friction sparks and other external heat sources to ignite flames caused by combustibles such as coal, wood, buildings, belts, oil, gas, etc. According to statistics, Accounting for about 25 ~ 30% of the mine fires.With the mine mechanization, increase the degree of electrification, the proportion of external fire is also increasing.At present, the proportion of external fires in coal mines in developed countries are mostly more than 50% .External fire hazards In particular, most of the downhole external fires occurred in well-ventilated underground wells. If they were not discovered in time or improperly extinguished, the fire developed rapidly and a large amount of toxic and harmful gases (such as carbon monoxide and carbon dioxide) were generated, which seriously threatened the lives of miners. Safety and property safety, with serious consequences. Therefore, we must attach great importance to the prevention and suppression of external fires.