In-line detonation flame arresters are important safety apparatus to prevent group tank fires caused by the spreading of fire through vapor connection lines. In this study, a DN50 experimental apparatus aimed at the detonation flame penetration characteristics and failure mechanisms in a flame arrester was set up, and a series of experiments were carried out with 6.6% C2H4 and air mixture. Pressure, and velocity of flame penetrating through flame arrester housing and filters were analyzed. Experimental results showed that the attenuation of pressure and velocity was proportional to the thickness of the filters. Two failure modes of the fire-extinguishing process in the flame arrester were captured directly with a high-speed camera. In Mode I, the detonation flame could go straight through the flame arrester filters when the filters were too thin. In Mode II, when the filters were not sufficiently thick, the remained shock wave pressure of detonation flame was still several times of the initial pressure and could rise sharply at the downstream contraction section, resulting in that the flammable gas at the downstream transition section could be compressed and reignited even the flame had been extinguished by filters. These conclusions are helpful to reveal the nature of failure modes of fire-extinguishing process and design flame arresters with high fire-resisting performance by structure improved.

在线爆炸式阻火器是重要的安全装置，可防止因蒸气通过蒸气连接管路蔓延而引起的组罐式起火。在这项研究中，建立了一个针对DN50爆炸装置的爆轰火焰穿透特性和破坏机理的DN50实验装置，并用6.6％的C2H4和空气混合物进行了一系列实验。分析了通过阻火器外壳和过滤器的火焰的压力和速度。实验结果表明，压力和速度的衰减与过滤器的厚度成正比。用高速摄像机直接捕获了灭火器中灭火过程的两种故障模式。在模式I中，当过滤器太薄时，爆炸火焰可能会直接穿过阻火器过滤器。在模式II中，当过滤器不够厚时，爆炸火焰的残留冲击波压力仍是初始压力的几倍，并且在下游收缩段可能急剧上升，导致下游过渡段的可燃气体可能被压缩并重新点燃，甚至火焰被过滤器熄灭。这些结论有助于揭示灭火过程失效模式的性质，并通过改进结构设计出具有较高耐火性能的阻火器。结果，即使过滤器将火焰熄灭，下游过渡段的可燃气体也可以被压缩并重新点燃。这些结论有助于揭示灭火过程失效模式的性质，并通过改进结构设计出具有较高耐火性能的阻火器。结果，即使过滤器将火焰熄灭，下游过渡段的可燃气体也可以被压缩并重新点燃。这些结论有助于揭示灭火过程失效模式的性质，并通过改进结构设计出具有较高耐火性能的阻火器。