发电厂电缆夹层早期火灾演化特征及探测技术研究  

Study on early fire evolution characteristics and detection technology of cable interlayer in power plant

作　　者：朱辉 朱垚垚 卢臻 Zhu Hui;Zhu Yaoyao;Lu Zhen(Sichuan Fire Science and Technology Research Institute of MEM,Sichuan Chengdu 610036,China;Department of Civil Engineering,Sichuan University,Sichuan Chengdu 610065,China;Chengdu Fire and Rescue Division,Sichuan Chengdu 610096,China)

机构地区：[1]应急管理部四川消防研究所,四川成都610036 [2]四川大学土木工程系,四川成都610065 [3]成都市消防救援支队,四川成都610096

出　　处：《消防科学与技术》2022年第10期1362-1366,共5页Fire Science and Technology

基　　金：应急管理部消防救援局科技计划项目(2021XFCX26);国家重点研发计划项目(2021YFC3002000)。

摘　　要：通过全尺寸电缆夹层试验平台,开展了电缆夹层早期(阴燃及初期)火灾探测试验,研究了温度场和CO气体蔓延特性,通过试验及模拟研究相结合的方法,对比分析了不同响应阈值的点型感烟、点型感温、吸气式感烟、缆式线型感温探测器的有效性。研究结果表明:阴燃及初期火灾温度场衰减均呈现指数函数关系;到火源的距离不同,阴燃火灾CO气体传播平均速度基本相同,而初期火灾CO气体传播平均速度随到火源的距离增加而降低;缆式线型探测器报警时间比吸气式探测器提前69%,比点型感烟探测器提前82%;各探测器初期火灾响应时间比阴燃火灾平均提前56%;阴燃火灾条件下点型感温探测器出现漏报现象;高阈值火灾探测器与低阈值探测器相比,响应时间延迟10%~20%。The early(smoldering and initial) fire detection experiments of cable interlayer are carried out through the fullscale cable interlayer experimental platform. The temperature field and CO gas propagation characteristics are studied. Based on the combination of experimental research and numerical simulation, the effectiveness of point-type temperature detector,point-type smoke detector, cable-type temperature detector, and suction-type smoke detector with different response time thresholds is analyzed. The results show that: The temperature field attenuation of smoldering and initial fire presents an exponential function. The average velocity of CO gas propagation in smoldering fire is basically the same when the distance from the fire source increases, but decreases with the increase of the distance from the fire source in the initial fire. The alarm time of cabletype temperature detector is 69% earlier than that of suctiontype smoke detector, and 82% earlier than that of point-type smoke detector. Compared with smoldering fire, the initial fire response time of each detector is 56% earlier on average. Under the condition of smoldering fire, the point-type temperature detector fails to report. The response time of fire detector with high alarm threshold is 10% ~ 20% later than that of low threshold detector.

关 键 词：发电厂 电缆夹层 早期火灾 温度场 CO体积分数 火灾探测 响应时间阈值 

分 类 号：TM621[电气工程—电力系统及自动化] TU990.3[建筑科学—市政工程]