一、前 言 当井下发生火灾而未及时发现时,则会给灭火造成困难,其结果是不仅会蒙受停产、采区被迫封闭等重大损失,还会夺去许多矿工的宝贵生命。 历来的井下火灾大多是由于焊接、切割、漏电、放炮或可燃物的温度高达燃点等所引起,除此而外,特别是煤矿,自然发火也是引起火灾的主要原因。同时,近年来由于采掘深度的增加,井下温度随之增高;通风系统复杂化;井下作业机械化带来可燃物增加等这些作业环境的变化,至使矿井火灾的危 I. INTRODUCTION When there is a fire in the well without being found in time, it will cause difficulties in extinguishing the fire. As a result, not only will it suffer such serious losses as the shutdown of production and the closure of the mining area, but also the valuable life of many miners. Historically, most underground fires are caused by the welding, cutting, leakage, blasting or combustibles temperature up to the ignition point, in addition, especially coal mines, natural fire is also the main cause of the fire. In the meantime, in recent years, as the depth of excavation increases, the temperature in the underground increases accordingly; the ventilation system is complicated; changes in the operating environment such as the increase of combustibles due to mechanized operation in the underground are brought to the danger of mine fire