ABSTRACT

Deposited coal dust, when involved in a methane explosion, aggravates the severity of a mine explosion accident. Mastering the explosion flame duration and flame signal intensity, thereby allowing reasonable determination of the amount of inhibitor to inject and duration, is key to inhibiting propagation of the explosion. To investigate the flame features and propagation of a coal dust explosion induced by a methane explosion, tests were performed in a purpose-built horizontal pipeline system. High-speed recordings of flame, flame signal intensity, and flame duration of the methane explosion and the deposited coal dust involved in that methane explosion were compared and analyzed. The coal dust involved in a methane explosion is characterized by much longer flame duration and a brighter flame, compared with a methane explosion. Under the condition that no new fuel becomes involved in the explosion, the time lag of the flame wave behind the pressure wave rapidly increases with the increase of the length-diameter ratio. The results are of significance for the flame propagation mechanism of deposition dust explosion reaction induced by gas explosion and for the prevention of gas-dust explosion accidents.

摘要

当涉及甲烷爆炸时，沉积的煤尘会加剧矿井爆炸事故的严重性。掌握爆炸火焰持续时间和火焰信号强度，从而合理确定抑制剂的注入量和持续时间，是抑制爆炸蔓延的关键。为了研究由甲烷爆炸引起的煤尘爆炸的火焰特征和传播，在一个专门建造的水平管道系统中进行了测试。对甲烷爆炸的火焰、火焰信号强度和火焰持续时间的高速记录以及甲烷爆炸所涉及的沉积煤尘进行了比较和分析。与甲烷爆炸相比，甲烷爆炸所涉及的煤尘具有更长的火焰持续时间和更亮的火焰。在没有新燃料参与爆炸的情况下，火焰波滞后于压力波的时间滞后随着长径比的增加而迅速增加。研究结果对瓦斯爆炸引起的沉积粉尘爆炸反应的火焰传播机理和预防瓦斯-粉尘爆炸事故具有重要意义。