窄通道过载线缆火灾早期燃烧特征及防治措施研究

Study on early combustion characteristics and prevention measures of overloaded cable fire in narrow channel

针对电缆沟、电缆夹层等窄通道内电缆火灾安全问题,本文开展过载线缆燃烧试验,定量表征了环境温升、典型气体质量浓度、火蔓延速率及熄火距离等特征参数。结果表明:燃烧初期CO_(2)的生成量要远远大于CO生成量,并且在一定范围的电流强度内,线缆火蔓延速率、熄火距离均与电流强度近似成线性正相关。在此基础上,从电气线路监控、早期火灾探测方法、防火阻隔等方面提出线缆火灾的防治措施,为窄通道内的电缆消防安全提供指导。

Aiming at cable fire safety in narrow channels,such as cable trench and cable interlayer,combustion experiments of overloaded cables were carried out in this work.The characteristic parameters such as ambient temperature rise,typical gas mass concentration,fire spreading rate and flameout distance were quantitatively characterized.The results showed that the amount of generated CO_(2) at the initial burning stage is much greater than the amount of generated CO.In a certain range of current intensity,the cable fire spread rate and flameout distance are approximately linearly positive correlated with the current intensity.Moreover,propose prevention and control measures for cable fire were put forward from the aspects such as electrical circuit monitoring and early fire detection methods and fire barriers,which can provide guidance for cable fire safety in narrow channels.