含NaCl超细水雾抑制甲烷爆炸实验研究

为研究含NaCl添加剂超细水雾对甲烷爆炸的影响，在自制的半封闭透明管道内，进行含NaCl添加剂超细水雾抑制甲烷爆炸试验，通过检测和分析在不同NaCl浓度情况下超细水雾的粒径和甲烷爆炸的平均火焰传播速度、爆炸超压以及平均升压速率，探究NaCl浓度对超细水雾粒径及其对抑制甲烷爆炸有效性的影响。研究结果表明:NaCl浓度对超细水雾粒径影响较小；对于体积分数为9.5%的甲烷，相比于纯甲烷爆炸，其平均火焰传播速率、最大爆炸超压以及平均升压速率分别下降了53.7%，63.4%和60.7%，相比于超细纯水雾，其平均火焰传播速率、最大爆炸超压以及平均升压速率分别下降了38.6%，58%，56%；在通雾量相同的条件下，浓度为2.5%NaCl超细水雾对体积分数为9.5%的甲烷爆炸抑制性能最佳；含NaCl添加剂超细水雾的物理化学共同作用可以有效抑爆甲烷。

Experimental study on methane explosion suppression by ultrafine water mist containing NaCl additive

In order to investigate the influence of ultrafine water mist containing NaCl additive on methane explosion, a methane explosion suppression experiment with ultra fine water mist containing NaCl additive is carried out in a self made semi closed transparent chamber to detect and analyze the particle size of ultrafine water mist and average flame propagation velocity, explosion overpressure, average pressure rise rate of methane explosion under different concentration of NaCl additive, explore the influence of NaCl additive concentration on ultrafine water mist particle size and its effectiveness in suppressing methane explosion. The results show that the NaCl additive concentration has little effect on the particle size of ultrafine water mist. For methane with a volume fraction of 9.5%, 2.5% NaCl additive concentration shows the most significant explosion suppression performance under the same spraying time. Compared with the no spraying condition, the average flame propagation velocity, maximum explosion overpressure and the average pressure rise rate decreased by 53.7%, 63.4%, and 60.7%, respectively; compared with pure water ultrafine water mist suppressing the explosion, those parameters decreased by 38.6%, 58%, and 56%, respectively; the combination of physical and chemical properties of ultra fine water mist containing NaCl additive can effectively suppress methane.