组合型多孔材料对容器管道系统内甲烷/空气的抑爆效果

Explosion suppression effect of CH_4/air by combined porous materials in a container piping system

为研究多孔材料对可燃气体的抑爆效果,选取了3类6种多孔材料分别组合后进行实验研究。以甲烷/空气预混气体作为研究对象,利用自制薄型铁环将多孔材料固定在密闭容器管道系统内,对比分析了薄型铁环、单层型多孔材料、双层组合型多孔材料和三层组合型多孔材料的抑爆效果。结果表明:薄型铁环增强了气体爆炸强度,铁环后爆炸压力最大;多孔材料抑爆效果明显,双层组合型多孔材料抑爆效果相比单层型多孔材料和三层组合型多孔材料稳定;抑爆效果最佳的组合型多孔材料为Al_2O_3 10mm/30PPI+SiC 20mm/20PPI,爆炸压力抑制效果最佳的组合型多孔材料为Al_2O_3 10mm/30PPI+Fe-Ni 10mm/90PPI+SiC 20mm/10PPI。

The combinations which were structured from three categories of porous materials including six sub-categories,were tested for studying the suppression effects of the porous materials on the explosion of the combustible gas.The combustible gas was the methane-air mixture.The porous materials were fixed in a closed container piping system by using a self-made thin iron hoop,then the explosion suppression effects of a thin iron hoop,single-layer porous materials,double-layer combination porous materials and three-layer combination porous materials were compared.The results show that the thin iron hoop could enhance the gas explosive intensity and the maximum explosion pressure was achieved behind the iron hoop.The explosion suppression effects of the porous materials were obvious,and the explosion suppression effects of the double-layer combination porous materials were more stable compared to those of the single-type porous materials and the three-layer combination porous materials.The optimized combination of the porous materials for explosion suppression turned out to be Al_2O_3 10 mm/30 PPI＋SiC 20 mm/20 PPI,and the optimized combination of the porous materials for explosion pressure suppression turned out to be Al_2O_3 10 mm/30 PPI＋Fe-Ni 10 mm/90 PPI＋SiC 20 mm/10 PPI.