Study on the suppression characteristics and explosion suppression mechanism of bentonite powder on methane explosion in pipe network
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.
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