索引号 | 1063180XG-2022-001073 | 发布日期 | 2022-09-20 | 发布机构 | 第十三师新星市 |
内容概述 |
燃烧必须同时具备3个条件:可燃物质、助燃物质和火源。灭火就是为了破坏已经产生的燃烧条件,只要能去掉一个燃烧条件,火即可熄灭。人们在灭火实践中总结出了以下几种基本方法。
1.冷却灭火法
将灭火剂直接喷洒在可燃物上,使可燃物的温度降低到自燃点以下,从而使燃烧停止;用水冷却尚未燃烧的可燃物质防止其达到燃点而着火的预防方法。
用水扑救火灾,其主要作用就是冷却灭火,一般物质起火,都可以用水来冷却灭火。
2.窒息灭火法
可燃物质在没有空气或空气中的含氧量低于14%的条件下是不能燃烧的。所谓窒息法,就是隔断燃烧物的空气供给。
采取适当的措施,阻止空气进入燃烧区,或用惰性气体稀释空气中的含氧量,使燃烧物质缺乏或断绝氧而熄灭,适用于扑救封闭式的空间、生产设备装置及容器内的火灾。火场上运用窒息法扑救火灾时,可采用石棉被、湿麻袋、湿棉被、沙土、泡沫等不燃或难燃材料覆盖燃烧或封闭孔洞;用水蒸气、惰性气体(如二氧化碳、氮气等)充入燃烧区域;利用建筑物上原有的门以及生产储运设备上的部件来封闭燃烧区,阻止空气进入。
3.隔离灭火法
可燃物是燃烧条件中最重要的条件之一,如果把可燃物与引火源或空气隔离开来,那么燃烧反应就会自动中止。如用喷洒灭火剂的方法,把可燃物同空气和热隔离开来、用泡沫灭火剂灭火产生的泡沫覆盖于燃烧液体或固体的表面,把可燃物与火焰和空气隔开等,都属于隔离灭火法。
采取隔离灭火的具体措施很多。例如,将火源附近的易燃易爆物质转移到安全地点;关闭设备或管道上的阀门,阻止可燃气体、液体流入燃烧区;拆除与火源相毗连的易燃建筑结构,形成阻止火势蔓延的空间地带等。
4.抑制灭火法
将化学灭火剂喷入燃烧区参与燃烧反应,使游离基(燃烧链)的链式反应中止,从而使燃烧反应停止或不能持续下去。采用这种方法可使用的灭火剂有干粉和卤代烷灭火剂。灭火时,将足够数量的灭火剂准确地喷射到燃烧区内,使灭火剂阻断燃烧反应,同时还应采取冷却降温措施,以防复燃。
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