基于综合管廊火灾特性的细水雾灭火系统应用研究

综合管廊电力电缆舱室具有较高的火灾危险性，一旦发生火情，极易酿成重大火灾事故。笔者研建了综合管廊实体火灾试验平台，开展了不同工况条件下的细水雾灭火系统局部应用与全淹没应用灭火试验研究。研究表明，对于综合管廊电力舱，细水雾灭火系统宜采用全淹没灭火方式；若需采用局部应用灭火方式，应对着火分区与相邻分区同时喷射细水雾，并保证一定的灭火区间长度和喷雾强度。灭火过程中，通风排烟系统与门窗洞口严重影响细水雾灭火性能，火灾时应及时联动关闭；全淹没应用时，适当增大系统喷雾强度，是保障细水雾高效能灭火的关键。

Application research of water mist fire extinguishing system based on fire characteristics of utility tunnel

The cabin containing power cable in the utility tunnel has high fire risk. In case of fire, it is very easy to cause a major fire accident. The author has developed and built a solid fire test platform for the utility tunnel, and carried out experimental research on local application and total flooding application of water mist fire extinguishing system under different working conditions. The results showed that: for the electric cabin of the utility tunnel, the water mist fire extinguishing system should adopt total flooding fire extinguishing mode, when it is really necessary to use local application fire extinguishing mode, the fire zone and adjacent zones shall be sprayed with water mist at the same time, and ensure the length of the fire extinguishing section and the intensity of the system spray. During fire extinguishing, ventilation and smoke exhaust system and door and window openings seriously affect the water mist fire extinguishing performance in case of fire, it shall be closed in time. When total flooding is applied, properly increasing the spray intensity of the system is the key to ensure the high fire extinguishing efficiency of water mist.