Abstract:

A series of experiments were conducted to study double-suppression effect of multi-layer wire-mesh structure on methane-air mixture explosion in a spherical vessel connected with pipelines. Explosion double-suppression effect was analyzed for explosion suppression structures with different layers and meshes. The most reasonable multi-layer wire-mesh structure was obtained. The combination of different layer number and mesh number had different explosion suppression effect on the linked vessels. Compared with single-suppression effect, the double-suppression effect was much better. Based on 5-layer 60-mesh, which had little single-suppression effect, the double-suppression effect was more effective while the 5-layer 40-mesh was adopted as double-suppression structure. 1-layer 60-mesh or 3-layer 60-mesh had little suppression effect, but 5-layer was different. When the layer of wire-mesh was more than five, the effect was significant, and the more the number of layers was, the better the explosion suppression effect was. Thus, in actual explosion protection design, the best explosion suppression structure should be decided by taking into account of the comprehensive effect of the times of suppression and layer number and mesh number of wire-mesh structure.

Key words: explosions, linked vessels, single-suppression, double-suppression, wire-mesh, explosion suppression, methane, mixtures

摘要：

实际生产中大多数储罐、反应器的进料口和卸料口都是与管道相连而形成连通结构,为考查丝网结构对连通容器内气体爆炸的二次抑制作用,以甲烷-空气混合物为研究对象,利用球形容器与管道构成的连通容器进行了抑爆实验,对比分析了单次抑爆与二次抑爆效果,并分析了不同目数和层数的丝网结构对连通容器的二次抑爆效果的影响。结果表明:丝网结构二次抑爆效果优于单次抑爆。当单次抑爆失效时加入40目5层丝网结构进行二次抑爆效果最好;加入60目1层、3层丝网结构无抑爆效果,加入5层、7层、9层丝网结构抑爆效果明显,而且抑爆作用随丝网层数增加而增强。因此,在工程设计中应根据实际情况综合考虑,选用合适的抑爆次数及抑爆结构。

关键词: 爆炸, 连通容器, 单次抑爆, 二次抑爆, 丝网结构, 抑爆影响, 甲烷, 混合物