Abstract:

In order to further improve the suppression efficiency of water mist on methane explosion, a small-scale experiment platform was set up to inhibit methane explosion using water mist. The NaCl additive was introduced to the ordinary water mist, and then charge the water mist containing NaCl additive to carry out experimental study on suppressing flame propagation of methane explosion using charged water mist containing NaCl additive. The experimental results show that the inhibition effect of charged water mist containing NaCl additive on methane explosion flame propagation is better than that the sum of inhibition effect when NaCl additive and charging effects act individually in nomal water mist. With the increase of NaCl concentration and charge voltage, the flame propagation velocity of methane explosion is obviously reduced. The secondary peak of the flame propagation velocity of methane explosion is decreased by 10.747 m·s^-1 compared with that of ordinary water mist,and the drop radio up to 60.26% when the charge is 8 kV and the concentration of NaCl is 12.5%; The secondary peaks of the load of 8 kV and NaCl concentration of 12.5% decrease by 5.177 and 5.247 m·s^-1 respectively, and the sum of the two decreases is 10.424 m·s^-1. The analysis considered that there exists a coupling effect between the NaCl additive and the charging effect in the process of suppressing the flame propagation of the methane explosion by the water mist.

Key words: inductive charge, sodium chloride additive, water mist, methane, flame velocity, coupling effect

摘要：

为进一步提高细水雾抑制甲烷爆炸的效率，搭建了小尺寸细水雾抑制甲烷爆炸实验平台，在普通细水雾中添加NaCl添加剂，并对其荷电，进行含NaCl添加剂荷电细水雾抑制甲烷爆炸火焰传播特性的实验研究。结果表明，含NaCl添加剂荷电细水雾对甲烷爆炸火焰传播的抑制效果，优于普通细水雾单独添加NaCl添加剂和荷电作用的抑制效果之和。随着NaCl浓度和荷电电压的增大，甲烷爆炸火焰传播速度明显减小；其中荷电8 kV、NaCl浓度12.5%的工况抑制效果最佳，甲烷爆炸火焰传播速度二次峰值较普通细水雾作用时下降了10.747 m·s^-1，下降比例高达60.26%；分析认为，在细水雾抑制甲烷爆炸火焰传播的过程中，NaCl添加剂和荷电作用之间存在相互促进抑制效果的耦合作用。

关键词: 感应荷电, NaCl添加剂, 细水雾, 甲烷, 火焰速度, 耦合作用