T型电缆廊道探测报警有效性分析

Effectiveness Analysis of T-type Cable Corridor Detection and Alarm

为分析火灾探测报警系统在地下综合管廊内的有效性,建立T型电缆廊道模型,在廊道内设置不同类型的探测报警系统——空间探测与对象探测,改变火源位置与环境气流速度,研究比较不同工况下火灾温度场与烟气浓度对探测系统报警有效性的影响。结果表明,T型管廊交叉点处温度及烟气浓度为临界值,在交叉点分散后两者产生突变;探测器报警时间最短的临界气流速度约为0.95~1.05 m·s^-1。另外,空间探测是对象探测的一种良好补充,可共同保障电缆廊道安全。

To analyze the effectiveness of fire detection alarm system in the underground pipe gallery,a Ttype cable corridor model was built up with different types of detection alarm systems including space detection and object detection installed in the corridor,in order to find out the influence of different fire source position and different air velocity on the effectiveness of the detection alarm system in different temperature fire field and different smoke concentration.The results show that the temperature and smoke concentration at the intersection of T-type tube corridors reach critical values,because they have abrupt changes after the intersection.The detection alarm is triggered immediately when the air velocity is about 0.95~1.05 m·s^-1,which is critical.In addition,space detection is a good complement to the object detection to ensure the security of cable corridor.