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室内织物因其容易点燃、燃烧速度快、蔓延迅速等燃烧特性,对室内火灾的发生、发展蔓延及火灾危害都有重要影响。在低强度热源加热条件下,研究了几种常见室内织物如牛仔裤、化纤运动裤、棉布床单、混合织物等温度变化、火灾烟气危害性及喷水对热解烟气的影响。结果表明,棉类织物在低强度火源引燃后烟气毒害成分主要为CO、NOx、SO2,3种毒性气体在7~10 min超过人体允许极限值,喷水降低了烟气毒性成分的生成速度与生成量,如牛仔裤热解烟气中CO、SO2的超标时间分别增加了约4 min、7 min,NOx则未超标;化纤类织物热解气体超标主要毒性成分为CO、SO2,喷水有利于化纤等聚合物熔融物的流动,在一定程度上反而加快了热量传递,热分解速度加快,有毒有害气体的生成量和产生速度增加。如加水后化纤运动裤热解烟气中,CO超标时间提前了10 min,SO2、NOx烟气也在20 min左右出现了超标情况。
Indoor fabric because of its easy to ignite, burning fast, rapid spread and other combustion characteristics of indoor fire occurrence, development and spread and fire hazards have a significant impact. In the condition of low-intensity heat source heating, several common indoor fabrics such as jeans, chemical sports pants, cotton sheets, mixed fabrics and other temperature changes, the fire hazard of smoke and water jet pyrolyzed flue gas. The results showed that the toxic components of cotton fabric were mainly CO, NOx and SO2 after ignition with low intensity ignition source. The three kinds of toxic gases exceeded the allowable limits of human body at 7 ~ 10 min and the water spray reduced the toxic components For example, the excessive time of CO and SO2 in the pyrolyzed flue gas of jeans increased by about 4 min and 7 min, while the NOx did not exceed the standard. The main toxic components of pyrolytic gas exceeded the standard for chemical fiber fabrics were CO, SO2, Water is conducive to chemical fiber and other polymer melt flow, to some extent, but to speed up the heat transfer, thermal decomposition speed, poisonous and harmful gas generation and increase the speed. Such as add chemical fiber sweat pants pyrolysis fume, CO exceeded the standard time 10 min earlier, SO2, NOx flue gas also appeared in 20 minutes or so exceeded the situation.