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.