城市地下综合管廊电缆火灾低压细水雾灭火效能研究
Research on the fire extinguishing efficiency of low-pressure water mist in urban underground utility tunnel cable fires
李彬 1宁赵玉 1张志伟 2贾伯岩3
作者信息
- 1. 中国矿业大学 安全工程学院,江苏 徐州 221116;中国矿业大学深圳研究院,广东 深圳 518000
- 2. 中国矿业大学深圳研究院,广东 深圳 518000
- 3. 国网河北省电力公司电力科学研究院,河北 石家庄 050011
- 折叠
摘要
为了研究城市地下综合管廊电缆火灾低压细水雾灭火的有效性、明确影响低压细水雾灭火效能的关键因素,搭建了缩尺寸综合管廊低压细水雾灭火试验平台并开展了灭火试验.试验结果表明,低压细水雾能够快速有效地扑灭综合管廊电缆火灾,灭火时间最快为 7 s,在启动灭火系统后 50 s即可将管廊内部最高温度从650℃降至40℃.压力与喷头流量系数的改变对低压细水雾灭火效能影响较大,灭火时间分别最多缩短75.0%和 66.7%,平均降温速率最高为 8.2℃/s和 7.43℃/s;喷头间距的改变对灭火效能影响相对较小,灭火时间最多缩短47.3%,平均降温速率最高为6.1℃/s.
Abstract
In order to study the effectiveness of low-pressure wa-ter mist fire extinguishing in urban underground integrated pipe corridor cable fire and to identify the key factors influencing its ef-ficiency,a scaled-down test platform for low-pressure water mist fire extinguishing in utility tunnels was constructed,and a serial of fire extinguishing tests were conducted.The test results demon-strate that low-pressure water mist can rapidly and effectively ex-tinguish cable fires in utility tunnels,with the quickest fire extin-guishing time of 7 s.Within 50 s of activating the system,the in-ternal temperature of the tunnel can be reduced from 650℃to 40℃.The changes in pressure and nozzle flow coefficient have a significant impact on the fire extinguishing efficiency of low-pressure fine water mist.The fire extinguishing time is shortened by up to 75% and 66.7% respectively,and the average cooling rate is highest at 8.2℃/s and 7.43℃/s;The change in nozzle spacing has a relatively small impact on fire extinguishing effi-ciency,with a maximum reduction of 47.3% in fire extinguishing time and an average cooling rate of 6.1℃/s.
关键词
低压细水雾/综合管廊/电缆火灾/灭火效能Key words
low-pressure water mist/utility tunnel/cable fire/fire extinguishing efficiency引用本文复制引用
基金项目
深圳市科创委基础研究专项面上项目(2022)(JCYJ20220530164601004)
国家电网河北省电力公司科技项目(kj2022-061)
出版年
2024
NETL
NSTL
万方数据