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 ›› 2021, Vol. 40 ›› Issue (6): 884-887.

• • 上一篇    下一篇

细水雾对置障管内预混气体抑爆机理研究

李卓然，夏远辰，张彬，于佳航，王博乔，陈力，林叶锦   

  1. 大连海事大学轮机工程学院，辽宁大连116026
  • 出版日期:2021-06-15 发布日期:2021-06-15
  • 通讯作者: 张彬（1982-），男，天津人，大连海事大学轮机工程学院副教授。
  • 作者简介:李卓然（1994-），男，辽宁大连人，大连海事大学轮机工程学院硕士研究生，主要从事船舶危险品储运的安全与保障等工作，辽宁省大连市凌水路一号大连海事大学轮机综合实验室，116026。
  • 基金资助:
    辽宁省自然科学基金项目（2020JH/10300107）；国家自然科学基金项目（51306026）；中央高校基本科研业务费专项资金项目（3132019038,3132019339）

Study on the suppression mechanism of water mist on the deflagration of premixed methane gas in a barrier tube

LI Zhuo-ran, XIA Yuan-chen, ZHANG Bin, YU Jia-hang, WANG Bo-qiao, CHEN Li, LIN Ye-jin   

  1. Marine Engineering College, Dalian Maritime University, Liaoning Dalian 116026, China
  • Online:2021-06-15 Published:2021-06-15

摘要： 为揭示细水雾对爆燃的抑制作用以及细水雾的释放位置对甲烷预混气体爆燃过程的影响，设计了4 种细水雾释放位置和3 种粒径（8、45、80 μm）的细水雾共13 种工况的实验。结果显示：8、45 和80 μm 细水雾在位置2 释放时管内压力分别降低36.59%、65.85%和31.7%。在位置3 释放时管内压力分别降低34.15%、56%和39.02%。8 μm 水雾对爆燃过程具有明显的抑制作用，且对火焰的结构和火焰面的影响较小；45 μm 水雾和80 μm 水雾对火焰结构和火焰面产生明显影响，火焰面出现褶皱，并呈现发散状向前扩展，随着水雾粒径的增大这种效果更加明显。细水雾对火焰主要有稀释预混气体、降低局部可燃气体浓度和气化吸热作用。在距点火点最近障碍物上方和两个障碍物之间释放水雾时对管内爆燃抑制效果最显著。

关键词: 细水雾, 半开敞置障管道, 预混甲烷, 爆燃, 抑制机理

Abstract: In order to reveal the suppression effect of water mist on deflagration and the influence of the release position of water mist on the deflagration process of methane premixed gas, four types of water mist release positions and three particle sizes (8, 45, 80 μm) were designed. Results showed that，when the 8, 45，80 μm water mist was released at position 2, the pressure in the tube decreased by 36.59%, 65.85% and 31.7%, respectively. When position 3 is released, the pressure in the tube decreases by 34.15%, 56%, and 39.02%, respectively. 8 μm water mist has a significant inhibitory effect on the deflagration process, and has little effect on the flame structure and flame surface; 45 μm and 80 μm water mist have a significant impact on the flame structure and flame surface, and the flame surface appears wrinkled and divergently expands forward, and this effect becomes more obvious as the particle size of the water mist increases. The water mist mainly dilutes the premixed gas, reduces the local combustible gas concentration and vaporizes and absorbs heat on the flame. When the water mist is released above the obstacle closest to the ignition point and between two obstacles, the effect of suppressing deflagration in the tube is the most significant.

Key words: water mist, semi- open barrier pipeline, premixed methane gas, deflagration, suppression mechanism