含NaCl超细水雾对不同阻塞率管道内爆炸的抑制

针对长距离输气管道频发的爆炸问题，在自行搭建的水平透明管道平台中开展了含NaCl超细水雾对不同阻塞率管道爆炸特性的影响研究。通过对瓦斯爆炸压力、火焰传播速度等特征参数进行分析，探究含NaCl超细水雾与不同阻塞率泄压口对爆炸特性的影响规律。结果表明：仅在不同阻塞率（0、0.2、0.4和0.6）的泄压口作用下的管道瓦斯爆炸，爆炸超压随着管道阻塞率的增大而增强，阻塞率与火焰锋面传播至管道末端时间呈非线性关系，在阻塞率为0.2时火焰平均速度最快；两者共同作用下，雾通量为8.4 mL、质量分数为8%的NaCl超细水雾阻火抑爆效果最佳，最大爆炸压力下降幅度可达59.2%；含NaCl超细水雾直接作用于爆炸火焰从而抑制爆炸传播。

Suppression of explosion in pipelines with different blocking ratios by ultrafine water mist containing sodium chloride

This work aims at the explosion problem in long-distance gas pipelines. An experimental study on the influence of ultrafine water mist with NaCl on the gas explosion characteristics of pipes with different blocking ratios was carried out in a self-built horizontally transparent duct. Such effects are quantified via the analysis of pressure and flame speed. The results show that the explosion overpressure increases with the increase of the pipeline blocking ratio in such gas explosion of the pipeline that is only under the pressure relief ports with different blocking ratios (0, 0.2, 0.4 and 0.6). Under the action of ultrafine water mist, the blocking ratio varies nonlinear with the time of flame front movement propagation to the end of the pipe. When the blocking rate is 0.2, the average flame velocity is the highest. When the fog flux is 8.4 mL and mass fraction of NaCl in it is 8%, the ultrafine water mist containing NaCl has the best fire and explosion suppression effect as the maximum explosion pressure drops by 59.2%. The ultra-fine mist containing NaCl acts directly on the explosion flame to suppress the explosion.