| To effectively reduce the risk of explosion in the use and storage of combustible gas,the effects of diamagnetic aluminum alloys,aluminum wires,copper wires,ferromagnetic iron wires and nickel wires on the explosion characteristics of methane,ethane and propane were carried out with or without magnetic field.The influence of magnetic field,different magnetic metal materials and different magnetic metal materials on the explosion of alkane gas under magnetic field was obtained.The gas explosion products were collected by Summa canister,the components and contents of the explosion products were detected and analyzed.The influence of magnetic field,different magnetic metal materials and different metal materials on the components of alkane gas explosion products under magnetic field was obtained.The CHEMKIN-PRO software was used to simulate the chain reaction process of methane,ethane and propane explosion,and the temperature sensitivity,formation rate change rule,key free radicals and elementary reactions during the explosion of methane,ethane and propane were obtained.Taking propane as the research object,the influence mechanism of different magnetic metal materials on the explosion characteristics of alkanes under the action of magnetic field was deduced by combining the simulated propane explosion reaction path with the detection and analysis results of propane explosion product components.The experimental results show that the maximum explosion pressure of methane,ethane and propane decreases obviously after applying magnetic field and filling different metal materials.The inhibitory effect of ferromagnetic metal materials on the explosion of three gases is significantly stronger than that of diamagnetic metal materials.Under the action of magnetic field,the inhibitory effect of ferromagnetic metal materials on the explosion of methane,ethane and propane is further enhanced,and the inhibitory effect of diamagnetic materials on the explosion of three gases does not change.The magnetic field enhances the explosion suppression performance of ferromagnetic metal materials for alkane gas explosion,but does not change the explosion suppression performance of diamagnetic metal materials for alkane gas explosion.The numerical simulation results show that·HCO→CO,CO→CO2,·HCO→CO2are three branched chain reactions that have a great influence on the production of CO and CO2,which are the main final products of alkane gas explosion.·HCO,·CH3,·H,·O,and·OH have significant effects on the temperature sensitivity,formation rate and product production during the explosion of alkane gas,which are the key free radicals in the process of alkane gas explosion.The faster the rate of chain reaction of·HCO,·CH3,·H,·O,and·OH,the faster the consumption rate of alkane gas and the greater the explosion intensity.The mechanism analysis results show that the magnetic field mainly changes the migration trajectory of key free radicals in the process of alkane gas explosion such as·H,·O,·OH,·CH3,and·HCO by applying the magnetic field force,so that stratification occurs between different free radicals,thereby reducing the chain reaction rate and reducing the gas explosion intensity.The metal material mainly plays a barrier,endothermic and wall effect,reducing the number of key free radicals such as·H,·O,·OH,·CH3,·HCO and the degree of gas expansion in the explosion reaction system,thereby reducing the collision probability between free radicals,slowing down the chain reaction rate of multiple free radicals,and reducing the gas explosion intensity.In addition,the magnetic properties of ferromagnetic metal materials are enhanced after being magnetized by the magnetic field,attracting more free radicals to collide with the surface of metal materials,further accelerating the destruction of free radicals,resulting in the magnetic field will enhance the explosion suppression performance of ferromagnetic metal materials for alkane gas explosion. |
PDF Full Text Request