主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2021, Vol. 40 ›› Issue (1): 68-75.

• • 上一篇    下一篇

110 kV高压电缆着火过程数值模拟研究

钟委1，马文辉1，孙超鹏1，高子鹤2，赵军1   

  1. 1. 郑州大学力学与安全工程学院，河南郑州450001；2. 郑州大学土木工程学院，河南郑州450001
  • 出版日期:2021-01-15 发布日期:2021-01-15
  • 通讯作者: 高子鹤（1990-），男，河南周口人，郑州大学土木工程学院在读博士，主要从事地下空间火灾防治理论及技术研究，河南省郑州市高新区科学大道100 号，450001。
  • 作者简介:钟委（1978-），男，重庆江津人，郑州大学力学与安全工程学院副教授，博士，主要从事地下建筑火灾防治及化工安全技术研究，河南省郑州市高新区科学大道100 号，450001。
  • 基金资助:
    河南省省科技攻关重点项目资助（182102310007）；国家留学基金委资助（201807045042）；国家自然科学基金-青年科学基金项目资助（51706219）

Numerical simulation on ignition process of 110 kV high-voltage cable

ZHONG Wei1, MA Wen-hui1, SUN Cao-peng1, GAO Zi-he2, ZHAO Jun1   

  1. 1. School of Mechanics and Safety Engineering, Zhengzhou University, Henan Zhengzhou 450001, China; 2. School of Civil Engineering, Zhengzhou University, Henan Zhengzhou 450001, China
  • Online:2021-01-15 Published:2021-01-15

摘要：

为了研究综合管廊局部空间内电缆接头内热源作用下的着火过程，通过运用数值模拟软件FDS 三维传热和热解模型对110 kV 高压电缆接头着火过程建模分析。研究了内外热源对电缆着火过程的不同影响，分析了不同运行状态下的温度分布情况，对比了不同缆芯材料的热传导作用对电缆着火过程的影响。结果表明，正常运行和短时过载状态下，电缆的火灾危险性很小，但长期过载和接头故障则会大大提高电缆的火灾危险性；不同于外部火焰由外向内对电缆的直接点燃，内热源作用下电缆的引燃需要较长时间的升温过程和热传导过程；相同条件下，铝芯电缆在着火时间，HRR 峰值及火灾发展速度方面都大于铜芯电缆；缆芯材料较强的热传导性能可以显著降低电缆内部热量聚集的速度，降低火灾发生的几率；提出了适用于内热源条件下的电缆燃烧驱动形式，即随着时间的推进，电缆燃烧过程从最初的内热源驱动阶段逐渐过渡到内热源与火焰共同驱动的阶段。

关键词: 电缆火灾, 着火过程, 数值模拟, 驱动形式

Abstract: In order to study the ignition process of the urban underground pipe gallery cable under the internal heat source, the ignition process of the 110 kV high voltage cable was analyzed by using the 3D heat transfer and pyrolysis model of FDS. The cable ignition process under different heat source types was studied, and the temperature distribution under different working conditions was analyzed. The influence of heat conduction by different cable core materials on cable ignition process was analyzed. The results showed that the cable has little fire risk under normal operation and short- term overload, but long- term overload and joint failure will greatly increase the fire risk of the cable. Different from the direct ignition process of external flame, the ignition of cable by internal heat source requires a considerable period of time for heat conduction and pyrolysis. Under the same conditions, the HRR peak and the flame spread velocity of aluminum core cables is greater than that of copper core cables.The good thermal conductivity of the cable core material can significantly increase the cable ignition time and reduce the risk of fire. A cable combustion driving mode suitable for internal heat sources is proposed.As time progresses, the cable combustion process transitions gradually from the initial internal heat source driving phase to the internal heat source and flame driving phase.

Key words: cable fire, ignition process, numerical simulation, drive mode