船用电缆火灾燃烧性能研究

Study on Combustion Performance of Marine Cable Fire

选取5种常用的船用电缆,采用锥形量热仪分析辐射强度、电缆尺寸、电缆结构对电缆燃烧热释放速率的影响,并通过电缆引燃时间和热释放速率峰值计算火灾逃逸指数以表征火灾危害性大小。研究结果表明:高辐射强度会降低引燃时间,提高热释放速率峰值,但是不改变电缆燃烧过程;大尺寸电缆引燃时间长,热释放速率高,火灾危害性大。护套材料对火灾蔓延有较大影响,在保证电缆电性能、机械性能的前提下,薄护套可以降低火灾蔓延速率;电缆中金属丝编织的应用可以显著降低电缆火灾危害性。

Five kinds of commonly used marine cables are selected,and the influence of radiation intensity,cable size and structure on the heat release rate of cable are analyzed by cone calorimeter.The fire escape index is calculat ed by the peak time of cable ignition and the peak of heat release rate to characterize the fire hazard.The results show that the high radiation intensity will reduce the ignition time and improve the peak heat release rate,but does not change the cable burning process.Cable with large size has a long ignition time,high heat release rate and high fire hazard.The sheath material has a great impact on the fire spread.Under the premise of ensuring the electrical and mechanical properties of the cable,the thin sheath can reduce the fire spread rate.The application of the wire braid in the cable can significantly reduce the cable fire hazard.