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 ›› 2024, Vol. 43 ›› Issue (9): 1328-1334.

• • 上一篇    

风流增强作用对城市地下物流通道液氮灭火效能提升研究

宁赵玉, 袁狄平, 张国维, 徐墩斌   

  1. （1. 中国矿业大学 安全工程学院，江苏 徐州 221116；2. 中国矿业大学 深圳研究院，广东 深圳 518000；3. 国网江苏省电力有限公司徐州供电分公司，江苏 徐州 221005）
  • 接受日期:2024-09-15 发布日期:2024-09-23
  • 作者简介:宁赵玉（1999— ），女，安徽亳州人，中国矿业大学安全工程学院硕士研究生，主要从事城市地下火灾防护方面的研究，江苏省徐州市铜山区大学路1号，221116，TS22120174P31@cumt.edu.cn。

Research on optimizing liquid nitrogen fire extinguishing efficiency in urban underground logistics systems through enhanced

Ning Zhaoyu ,Yuan Diping, Zhang Guowei, Xu Dunbin   

  1. Fire suppression systems commonly used in narrow and confined spaces have limitations when applied in urban underground logistics systems, making them difficult to implement directly. To investigate the improvement in liquid nitrogen extinguishing efficiency under the influence of enhanced longitudinal ventilation in urban underground logistics systems, this study analyzes the changes in oxygen volume fraction and ceiling temperature under different working conditions by varying wind speed and nitrogen injection position. The results indicate that nitrogen injection can effectively extinguish fires in underground logistics tunnels, and enhanced longitudinal ventilation significantly improves the extinguishing efficiency of liquid nitrogen. When the nitrogen injection distance is 50 m, the extinguishing efficiency under a wind speed condition of 2 m/s is increased by 41.86% compared to a wind speed condition of 0 m/s. Additionally, at a fixed nitrogen injection distance, enhanced longitudinal ventilation significantly advances the time when the temperature and oxygen volume fraction near the fire source begin to decline. Moreover, as the nitrogen injection distance increases, the time for the temperature and oxygen volume fraction near the fire source to decline is delayed; however, enhanced longitudinal ventilation can mitigate the lag in cooling and asphyxiation effects caused by the increased injection distance. These findings provide important theoretical support for fire suppression research in urban underground logistics systems.
  • Accepted:2024-09-15 Published:2024-09-23
  • Contact: 江苏省自然科学基金面上资助项目（BK20221548）；深圳市科创委2022年度基础研究专项面上项目（JCYJ20220530164601004）

摘要： 狭长受限空间中常用的灭火系统在地下物流通道中存在限制，难以直接应用。为了探究风流增强作用对液氮灭火效能的影响，文章通过改变风速和注氮位置，对不同工况下地下物流通道氧气浓度与顶棚温度的变化进行分析。结果表明，注氮能够有效扑灭地下物流通道火灾，风流增强显著提升了液氮的灭火效能，注氮距离为50 m时，风流 2 m/s工况的灭火效率较风流 0 m/s工况提高了41.86%。同时，在固定的注氮距离下，增强风流后火源附近的温度和氧气体积分数下降的时间明显提前。此外，当注氮距离增加时，火源附近温度和氧气体积分数下降时间均推迟，但风流增强能够减少由于注氮距离较远导致的降温和窒息效果的滞后。该研究成果对于城市地下物流系统灭火研究提供了重要的理论依据。

关键词: 地下火灾；地下物流通道；液氮灭火；风流增强

Abstract: underground fire; urban underground logistics systems; liquid nitrogen extinguishing; enhanced longitudinal ventilation