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建筑物发生火灾时,烟的危害主要是吸入人体后中毒死亡。烟中有多种多样的毒气,其中Co是主要的致死原因,Co浓度达到1000ppm时人移动困难,达到3000ppm时超过30分钟人即会死亡。如1986年4月2日,天津市和平区松江里火灾,其中十三名死亡者中绝大多数也是吸入过量烟气死亡。烟气的另一危害是助长火势蔓延,火灾实践表明,烟的温度可达600—700℃,能引燃临近部位的可燃物。烟气在一定空间内逐步积聚,会使内部温度升至可燃物的着火点而引起新的燃烧,造成火势蔓延扩大。烟还有一
When a fire occurs in a building, the major hazard of the smoke is poisoning and death after being inhaled into the human body. There is a wide range of toxic gases in the smoke, of which Co is the major cause of death. When Co concentration reaches 1000 ppm, the person is hard to move and dies for more than 30 minutes at 3000 ppm. As of April 2, 1986, a fire broke out in Songjiang, Heping District, Tianjin. Most of the 13 deaths were also due to inhalation of excess fumes. Another harm to flue gas is to promote the spread of the fire. The fire practice shows that the temperature of the smoke can reach 600-700 ℃, which can ignite combustibles near the site. The gradual accumulation of flue gas in a certain space will cause the internal temperature to rise to the ignition point of the combustible material and cause new combustion, resulting in the spread of the fire. One more cigarette