膨润土粉体对管网甲烷爆炸的抑制特性及抑爆机理
Study on the suppression characteristics and explosion suppression mechanism of bentonite powder on methane explosion in pipe network
贾进章 1肖聆伊 1王枫潇1
作者信息
- 1. 辽宁工程技术大学安全科学与工程学院,辽宁阜新 123000;辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛 125100
- 折叠
摘要
为了探寻高效的抑爆剂,有效降低甲烷爆炸事故发生率,最大限度地降低事故损失,利用自主搭建的爆炸管网测试系统进行了膨润土粉体抑爆试验.将爆炸超压峰值、爆炸威力指数和爆炸火焰首次到达管网两出口的时刻作为表征抑制剂抑爆性能的参数,探究了不同粒径膨润土粉体对管网甲烷爆炸的抑制性能,利用热解特性分析和分子动力学仿真探究了膨润土粉体的物理和化学抑爆机理.结果表明,粒径为＞27～33 μm的膨润土粉体对于管网甲烷爆炸的抑制性能最佳.膨润土粉体的物理抑爆机理为通过热解吸收反应热来实现抑爆目的;其化学抑爆机理为膨润土分子能够有效消耗反应体系中的自由电子和活性自由基,减缓甲烷链式反应速率.研究结论可为提高甲烷运输的安全性、有效降低灾害风险提供理论参考.
Abstract
Methane explosion accidents are a major threat to modem industrial production safety,exploring efficient and environmentally friendly methane explosion inhibitors is of great significance to modern production safety.To explore efficient explosion suppression agents,effectively reduce the incidence of methane explosion accidents,and minimize accident losses,bentonite powder explosion suppression experiments were conducted using a self-built explosion pipe network testing system in this study.Three factors including the peak overpressure of an explosion,the index of the explosion power,and the time length when the first wave of flames reaches the pipe network's outlet,were measured to evaluate the performance.The method of combining experimental research and theoretical analysis was used to explore the explosion suppression performance of bentonite powder with particle sizes of 10-15 µm,＞15-21μm,＞21-27 μm,＞27-33 μm,and＞33-39 µm on pipeline network methane explosions.Moreover,an analysis of the physical and chemical explosion suppression mechanisms of bentonite powders with different particle sizes was also conducted through the research methods of pyrolysis characteristic analysis and molecular dynamics simulation.According to the results,the bentonite powder with a particle size of＞27-33 μm has the best performance in inhibiting methane explosions in pipe networks.The physical explosion suppression mechanism of bentonite powder can be briefly described as that bentonite powder mainly achieves physical explosion suppression through thermal decomposition and absorption of reaction heat.Its chemical explosion suppression mechanism is that bentonite molecules can effectively consume the number of free electrons and active radicals in the reaction system,fully participate in the methane explosion chain reaction,through a series of chemical reactions,and significantly mitigate the rate of some key methane explosion chain reactions.The conclusions obtained from this study can provide a theoretical reference for improving the safety of methane transportation and effectively reducing disaster risks.
关键词
安全工程/甲烷抑爆/爆炸管网/膨润土粉体/抑爆性能/抑爆机理Key words
safety engineering/methane explosion suppression/explosion pipeline network/bentonite powder/explosion suppression performance/explosion suppression mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据