CO2-双流体细水雾抑制管道甲烷爆炸实验

摘要

搭建了尺寸为120 mm×120 mm×840 mm 透明有机玻璃瓦斯爆炸管道实验平台，采用双流体喷嘴将二氧化碳和细水雾送入实验系统，从火焰速度、瓦斯爆炸超压两个方面探讨双流体细水雾的抑爆有效性。实验结果表明CO2双流体细水雾抑制瓦斯爆炸效果显著。随着喷雾时间的延长，火焰传播速度呈缓慢增加趋势，火焰传播速度峰值大幅降低；爆炸超压曲线呈先增大后缓慢减小的趋势，超压峰值大幅降低；当 CO2压力增至0.4 MPa 喷雾时间大于3 s 时，经多次点火无法引爆，说明 CO2-双流体细水雾抑制甲烷爆炸时具有协同效应，有利于提高细水雾的抑爆效率。%The experimental study on the synergistic suppression effect of carbon dioxide and ultrafine water mist on stoichiometric premixed methane/air mixture in a vented duct was carried out in this paper. The ultrafine water mist was generated from a twin fluid nozzle. The results indicated that CO2 and water mist had a synergistic suppression effect on methane/air explosion and the efficiency of explosion suppression was significantly improved. With the increase of mist spraying time, the peak flame propagation speed and peak overpressure decreased obviously. When the pressure of CO2 increased to 0.4 MPa and mist spraying time was more than 3 s, the methane/air mixture cannot be detonated after several times of ignition. It was beneficial to improve the explosion suppression efficiency of water mist.