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 ›› 2024, Vol. 43 ›› Issue (8): 1059-1065.

• • 上一篇    下一篇

密闭管道内非连续分布甲烷/空气爆炸特性

郑凯, 周朋   

  1. (常州大学 安全科学与工程学院,江苏 常州 213164)
  • 收稿日期:2024-03-20 修回日期:2024-05-11 出版日期:2024-08-19 发布日期:2024-08-15
  • 作者简介:郑 凯(1989- ),男,河南信阳人,常州大学安全科学与工程学院副研究员,博士,主要从事消防、防火防爆方面的研究,江苏省常州市武进区科教城滆湖中路21号,213164,zk@cczu.edu.cn。
  • 基金资助:
    基金项目:国家自然科学基金(51804054)

Explosion characteristics of discontinuous distribution methane/air in closed pipe

Zheng Kai, Zhou Peng   

  1. (College of Safety Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China)
  • Received:2024-03-20 Revised:2024-05-11 Online:2024-08-19 Published:2024-08-15

摘要: 在长度900 mm、截面为100 mm×100 mm的矩形密闭管道内开展预混气体非连续分布对甲烷/空气爆炸影响的试验研究。通过分段通入甲烷体积分数为9.5%的预混气体,形成甲烷/空气-空气和甲烷/空气-空气-甲烷/空气两种非连续分布模式。研究发现,随着空气区域缩短,火焰传播距离、火焰尖端速度和爆炸超压均增大。特别是在甲烷/空气-空气-甲烷/空气分布中,当中间空气区域小于500 mm时,火焰会穿越并引发二次爆炸,且其超压随空气区域减小而增加。研究结果可为天然气爆炸事故防控提供理论支持。

关键词: 非连续分布, 甲烷/空气, 火焰行为, 火焰尖端速度, 爆炸超压

Abstract: In this paper, the effect of discontinuous distribution of premixed gas on methane/air explosion was studied experimentally in a rectangular closed pipe with a length of 900 mm and a section of 100 mm×100 mm. Segmentally introduce methane/air with a volume fraction of 9.5% into the pipe to form two types of discontinuous distribution premixed gases: methane/air-air and methane/air-air-methane/air. The results show that the flame propagation distance, flame tip speed and explosion overpressure increase with the shortening of the air area. Especially in the form of methane/air-air-methane/air distribution, when the intermediate air area is less than 500 mm, the flame will pass through and cause a secondary explosion, and its overpressure will increase with the decrease of the air area. The research results can provide theoretical support for the prevention and control of natural gas explosion accidents.

Key words: discontinuous distribution, methane/air, flame behavior, flame tip speed, explosive overpressure