Preparation Of Porous Polypropylene Material And The Study Of Its Effect On Methane Explosion Propagation Characteristics

Combustible gas has great safety hazards during transportation and use.Fire and explosion accidents occur from time to time.Therefore,the research on the protection of combustible gas explosion is extremely important.This article uses this as a starting point to carry out research on the effects of porous polymer materials on the explosion propagation characteristics of methane-air premixed gases,and provides a reference for the application of porous non-metallic materials in the field of barrier explosionproof technology.In this study,a porous polypropylene material with high-efficiency barrier explosion-proof performance is prepared,and its thermal stability,fire resistance and flame retardancy are tested.The influence of the inner diameter,filling position and filling length of porous polypropylene barrier explosion-proof materials on the explosion propagation characteristics of methane-air premixed gas is investigated through a gas explosion test platform.Parameters such as flame propagation image,flame propagation speed,explosion pressure,and explosion rise rate are analyzed,revealing that porous polypropylene barrier explosion-proof materials prevent methane-air.Suppression mechanism of mixed gas explosion.The main research contents are as follows:(1)After adding an appropriate proportion of flame retardant to polypropylene material,carbon residue rate after the pyrolysis reaction of the material is increased,and it is converted from flammable to flame retardant.The flame retardant level has reached V-0 level.The material’s heat release rate,total heat release rate and the release amount of harmful gases significantly reduce.These effectively improve the thermal stability,fire resistance and flame retardancy of polypropylene materials.Porous polypropylene barrier explosion-proof materials with different specifications are prepared by using the flame retardant formula in this proportion.(2)The explosion propagation characteristics of the methane-air premixed gas are investigated.The flame front propagated towards the upper wall surface of the pipeline.The front velocity shows acceleration,fluctuation,acceleration and deceleration.The peak pressure of explosion pressure and explosion pressure monitored at the end of the pipeline are the largest.After filling the porous polypropylene barrier explosion-proof material,as the inner diameter of the material is decreased,the explosion pressure and the rate of increase of the explosion pressure in the pipeline are significantly reduced.When the inner diameter is the smallest,the maximum explosion pressure and the maximum explosion pressure increase rate at the end of the pipeline are reduced by 57.48% and 75.71%;The closer the filling position of the material is to the initiation device,the lower the explosion pressure of the pipeline.When filling the front of the pipe,the maximum explosion pressure and the maximum explosion pressure increase rate at the end of the pipeline are reduced by66.11% and 82.45%;When filling 6m of porous polypropylene to block the explosionproof material,the maximum explosion pressure and the maximum explosion pressure rise rate of the pipeline were reduced by 73.42% and 86.75%;It has obvious suppression effect on flame and explosion shock wave of methane-air premixed gas.The explosion proof of porous polypropylene materials is due to its unique skeleton structure and huge specific surface area,which can consume a lot of free radicals in the chain reaction,accelerate the transfer of heat to the outside,and play the role of shock absorption and shock absorption.Therefore,it can suppress the propagation of flame and explosion shock waves.