细水雾抑制空运锂电池火灾机理及自动控制研究

发布时间：2018-06-10 04:44

  本文选题：锂电池 + 火灾　； 参考：《中国民航大学》2017年硕士论文

【摘要】：近年来锂离子电池的应用越来越广泛。然而锂离子电池热失控引发的各类事故频发,安全问题凸显。航空运输中的锂电池如果发生热失控后果将不堪设想。因此,空运锂电池安全问题亟待解决。本文开展不同电量、不同数量、不同排列方式的锂电池燃烧实验与细水雾灭火实验,深化对锂电池火灾的认识,掌握诱发锂电池热失控的原因、分析细水雾抑制空运锂电池火灾机理。采用Fluent软件与PyroSim-FDS软件相结合的模拟方法,得出联动探测报警温度预设值取值和细水雾抑制实验规模的空运锂电池火灾推荐用水量,并基于温度实时探测编写了自动控制程序,构成一套抑制空运锂电池火灾的自动控制系统。研究结果表明,细水雾能够有效抑制锂电池火灾;联动探测报警温度预设值取值区间为46.3℃~73.2℃;在流量4L/min、喷射速度30m/s、喷雾锥角60°的条件下细水雾抑制实验规模的空运锂电池火灾推荐用水量区间为243mL~591mL;运用MAX6675模块采集以K型热电偶为火灾探测器的信号的方法能够实时探测火灾中的锂电池温度,整套探测报警联动喷雾的自动控制系统成功抑制了空运锂电池火灾。设计的基于温度实时探测的联动报警喷雾自动控制系统有着汽化率高、用水量少和报警准确等优势,同时实现了抑制空运锂电池火灾的目的。整套系统可为解决空运锂电池安全性问题提供方案参考。
[Abstract]:In recent years, lithium ion batteries are more and more widely used. However, various accidents caused by thermal runaway of lithium ion batteries occur frequently, and safety problems are highlighted. Lithium batteries in the air transport if the heat out of control consequences will be unthinkable. Therefore, the safety problem of air lithium battery needs to be solved urgently. In this paper, the combustion experiment of lithium battery and the fire extinguishing experiment of fine water mist with different electric quantity, different quantity and different arrangement are carried out to deepen the understanding of lithium battery fire, and to grasp the cause of the heat runaway of lithium battery. The mechanism of water mist suppressing the fire of air lithium-ion battery is analyzed. The simulation method of combining fluent software with PyroSim-FDS software is used to get the preset value of alarm temperature for linkage detection and the recommended quantity of water mist suppression experiment scale for air lithium-ion battery fire, and an automatic control program based on real-time temperature detection is written. An automatic control system is constructed to suppress the fire of air lithium battery. The results show that the fine water mist can effectively suppress the fire of lithium battery, and the range of preset temperature for linkage detection and alarm is 46.3 鈩，

本文编号：2002014