摘要
在低压低氧舱中对小纸箱进行点火燃烧实验,探讨不同压力环境、不同通风条件对固体火灾燃烧热释放速率、火焰高度、火焰温度等燃烧性能的影响。燃烧工况的压力为90、75、64kPa,通风条件为不打孔、单面打孔和双面打孔。分析实验过程中热电偶的最高温度、最高温度对应的热电偶的位置以及压力变化曲线。结果表明:通风条件对固体可燃物在同一压力下的燃烧抑制作用显著。通风条件良好时,在75kPa的环境压力下,固体可燃物的燃烧可进入充分燃烧阶段。相同压力环境下,通风条件的改善缩短了固体可燃物燃烧发展阶段的时间,提高了固体可燃物燃烧的火焰温度。在相同通风条件下,环境压力降低,固体可燃物最大燃烧速率降低,固体可燃物上方相同位置的火焰温度下降,最大燃烧速率、火焰温度与环境压力成正比;压力近似时,火源温度的高低与固体可燃物热解的速度成正比,火源温度最低的固体可燃物燃烧质量变化曲线最为平缓。
The common cartons of equivalent fire load were a the combustion of solid fuel can evolve into full combustion stage at the ambient pressure of 75 kPa under good ventilation condition; the improvement of ventilation condition shortens the time of the combustion and development stage for .solid fuels and improves the flame temperature of the solid fuel combustion under the same pressure environment; with the ambient pres- sure going down, the maximum combustion rate of solid com- bustibles is declining, the flame temperature in the same posi- tion over the solid combustibles is decreasing, the maximum combustion rate and the flame temperature are in direct propor- tion to the ambient pressure under the same ventilation condi- tion; when the pressures are approximate, the temperature of the ignition source is in direct proportion to the pyrolysis speed of the solid combustibles and the mass-change curve of the solid combustibles with the lowest temperature of ignition source is the gentlest.
出处
《消防科学与技术》
CAS
北大核心
2016年第6期759-762,共4页
Fire Science and Technology
关键词
低压环境
纸箱火
热释放速率
抑燃
燃烧特性
通风条件
最高温度
low-pressure environment
carton fire
heat releaserate
fire suppression
combustion characteristics
ventilation condition
highest temperature
