Study On The Effect Of Metallic Separate And Explosion-proof Material Magnetic On Explosion Of Premixed Combustable Gases

China’s petroleum and chemical industries play an important role in the development of the national economy and are pillar industries in China.However,the frequent explosions and combustion accidents in petrochemical enterprises in recent years have aroused strong concern of the whole society.Filling oil and gas storage tanks with separate and explosion-proof materials is one of the most widely used intrinsic safety measures for oil and gas storage tanks.Studies have shown that the magnetic field can directly affect the explosive elementary reaction,which affects the severity of the explosive reaction.Therefore,it is meaningful to carry out systematic research on the influence and the reaction mechanism of the magnetic of metallic separate and explosion-proof materials on the explosive characteristics of combustible gases.It has important theoretical and practical guiding significance for the theoretical research of gas explosion hazard prevention and control and the development of new separate and explosion-proof materials.The experiments on the evaluation of the explosion suppression performance of metallic aluminum,copper,nickel,and iron separate and explosion-proof materials and the effect of external magnetic fields on the explosive reaction characteristics of combustible gases with H₂/Air、CH₄/Air、C₃H₈/Air、C₄H₁₀/Air premixed gas explosion which were most likely to cause explosion accidents in chemical companies were carried out in an independently designed experimental platform.The gas chromatography analysis and detection technology and CHEMKIN-PRO numerical simulation software were used to conduct research on the mechanism of the impact of metallic separate and explosion-proof materials on the explosive reaction of combustible gases.The results showed that there was no significant difference in the explosion suppression performance of the four metallic separate and explosion-proof materials in the explosion experiment of H₂/Air premixed gas;the ferromagnetic metallic iron and nickel separate and explosion-proof materials were superior to the nonmagnetic metallic aluminum and copper separate and explosion-proof materials in the CH₄/Air and C₃H₈/Air premixed gas explosion experiments,and the phenomenon was more obvious with the increase of the volume fraction and molecular weight of combustible gas.The external magnetic field could promote the explosion of the premixed gas in the case of an empty pipeline;the external magnetic field could obviously inhibit the explosion reaction of the premixed gas after filling the pipeline with metallic iron separate and explosion-proof material.The mechanism research based on qualitative and quantitative analysis of explosive products by gas chromatography and CHEMKIN-PRO numerical simulation analysis found that:the separate and explosion-proof material strengthens the branch chain reaction of hydrocarbons generated in the explosion reaction of C₃H₈/Air premixed gas,promotes the generation of C₂H₄,C₂H₆.At the same time,the reaction of C₃H₈ with oxygen is weakened,mainly by trapping and destroying HCO?,weakeningHCO?+O₂→HO₂?+CO.While reducing the generation of CO and CO₂,it significantly reduces the release of explosive energy,thus suppressing the explosive reaction of C₃H₈/Air premixed gas.Research also shows that the ferromagnetic metallic materials enhance the capture and destruction of free radicals;In the empty pipeline,the DC electromagnetic field stimulates the explosion reaction of premixed combustible gas;After being filled with metallic iron separate and explosion-proof material t,the DC electromagnetic field suppresses the explosive reaction of combustible gas.