The explosion is one of the most serious safety incidents occurring in the application of the gas methane in industrial process. The new developments in attenuating the destruction and environmental hazard of this explosion are conducted using the combined inert gas and ABC dry powder. The explosive characteristic parameters including flame configuration, velocity of flame propagation, explosion pressure, and pressure rising rate are quantified and revealed. The difference of explosion mitigation effect of ordinary and ultra‐fine ABC dry powders are examined based upon the specific surface area and the settling velocity. As the concentration of ordinary or ultra‐fine ABC dry powder increases, the explosion pressure initially increases and decreases afterwards, indicating that there is an optimal mass concentration of explosion mitigation for both powders. The effect of ignition delay time on the explosion mitigation of ultra‐fine ABC dry powder is characterized on the basis of the turbulent lever and the dry powder particle settling state. Moreover, the mechanisms of explosion mitigation with CO2 and the ultra‐fine ABC dry powder are fully revealed both on the physical and chemical properties. The present research provides basic data and theoretical guidance for prevention and controlling of gas explosion accidents.

中文翻译：

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密闭室中惰性气体和ABC干粉联合应用的甲烷-空气混合物的防爆

爆炸是瓦斯甲烷在工业过程中应用过程中发生的最严重的安全事故之一。使用惰性气体和 ABC 干粉的组合，在减轻这种爆炸的破坏和环境危害方面取得了新的进展。对包括火焰形态、火焰传播速度、爆炸压力和升压速率在内的爆炸特征参数进行量化和揭示。根据比表面积和沉降速度，考察了普通和超细ABC干粉的防爆效果差异。随着普通或超细ABC干粉浓度的增加，爆炸压力先升高后降低，表明两种粉末都有最佳的爆炸缓解质量浓度。基于湍流杠杆和干粉颗粒沉降状态表征了点火延迟时间对超细ABC干粉爆炸缓释的影响。此外，CO2 和超细 ABC 干粉的减爆机制在物理和化学性质上都得到了充分揭示。本研究为瓦斯爆炸事故的防治提供了基础数据和理论指导。CO2 和超细 ABC 干粉的减爆机理在物理和化学性质上都得到了充分揭示。本研究为瓦斯爆炸事故的防治提供了基础数据和理论指导。CO2 和超细 ABC 干粉的减爆机理在物理和化学性质上都得到了充分揭示。本研究为瓦斯爆炸事故的防治提供了基础数据和理论指导。