摘要
针对电动汽车电池箱的封闭空间火灾,设计无电源感温自启动灭火管系统。采用正庚烷模拟火源,全氟己酮和六氟丙烷作为灭火介质,分析0、0.88和1.81 MPa压力下的灭火过程、管内压力变化、灭火剂使用率和灭火时间。结果表明:全氟己酮和六氟丙烷灭火管系统的灭火过程相似,均可分为预热-管破裂喷射-火焰熄灭后继续喷射3个阶段;六氟丙烷灭火管系统灭火剂的实际使用率为100%,全氟己酮灭火管系统灭火剂的实际使用率在50%~95%之间,压力增加可大幅提高全氟己酮实际使用率;六氟丙烷灭火管系统在20 s内实现灭火,全氟己酮灭火管系统的灭火时间较其更长。
A temperature sensitive self-starting fire extinguishing pipe system with no power supply was designed for closed space fire accident of electric vehicle battery box.The fire source was simulated using n-heptane.The test was carried out in a test chamber using perfluorohexanone and hexafluoropropane as the extinguishing medium.The fire extinguishing process,pressure change in the pipe,use rate of fire extinguishing agent and fire extinguishing time were analyzed under the pressure of 0,0.88 and 1.81 MPa.The results show that the fire extinguishing process of perfluorohexanone and hexafluoropropane fire pipe systems is similar,which can be divided into three stages:preheating-pipe rupture jet-flame extinguishing and continued jetting,that the actual use rate of extinguishing agent for hexafluoropropane fire extinguishing pipe system is 100%,that the actual use rate of perfluorohexanone fire extinguishing pipe system is between 50%and 95%,and the increase of pressure greatly increases the actual use rate of perfluorohexanone,that the hexafluoropropane fire extinguishing pipe system can extinguish the fire within 20 s,and that the fire extinguishing time of the perfluorohexanone fire extinguishing pipe system is longer than that of hexafluoropropane fire extinguishing pipe system.
作者
杨魏恺
丛晓民
赵林双
YANG Weikai;CONG Xiaomin;ZHAO Linshuang(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2019年第11期58-63,共6页
China Safety Science Journal
基金
国家重点研发计划项目(2018YFB0104000)。
关键词
电动汽车火灾
封闭空间
压力变化
灭火剂使用率
感温自启动灭火管系统
灭火时间
electric vehicle fire
closed space
pressure change
extinguishing agent usage rate
temperature-sensing self-starting fire extinguishing pipe system
fire extinguishing time
