不同磁性金属丝对氢气爆炸的影响机理研究

Influence Mechanism of Different Magnetic Wires on Hydrogen Explosion

为探索氢气爆炸防治新技术,开发新型阻隔防爆材料,开展了抗磁性铝丝和铁磁性镍丝对预混氢气-空气爆炸压力影响实验,利用CHEMKIN-PRO软件对氢气爆炸过程中的反应路径和温度敏感性变化进行模拟。实验结果表明,两种金属丝对氢气-空气混合气体爆炸具有双重作用:当混合气体中氢气的体积分数低于20%时,金属丝材料抑制氢气爆炸,且材料填充量越大,抑制作用越强;当混合气体中氢气的体积分数高于25%时,两种金属丝促进氢气爆炸,且填充量越大,促进作用越强。在促进爆炸阶段,镍丝的促进效果弱于铝丝;在抑制爆炸阶段,镍丝的抑爆效果优于铝丝。模拟结果表明,R2对氢气的生成速率影响最大,R1对氢气及爆炸过程中的温度影响最大,影响温度敏感性变化的主要基元反应对爆炸均具有促进作用。通过实验和数值模拟综合分析,揭示了不同磁性金属丝对氢气爆炸的影响机理,可为氢气爆炸防治和开发新型阻隔防爆材料提供理论指导。

For exploring the new technologies of hydrogen explosion prevention and the development of new barrier and explosion-proof materials,the effects of anti-magnetic aluminum wire and ferromagnetic nickel wire on premixed hydrogen-air explosion pressure were carried out.The CHEMKIN-PRO software was used to simulate the reaction path and temperature sensitivity changes during hydrogen explosion.The experimental results show that the two metal wires have a dual effect on the explosion of hydrogen-air mixture.When the volume fraction of hydrogen in the mixture is less than 20%,the metal wire material inhibits hydrogen explosion,and the larger the filling amount of the material,the stronger the inhibition.When the volume fraction of hydrogen in the mixed gas is higher than 25%,the two metal wires promote hydrogen explosion,and the larger the filling amount,the stronger the promotion.In the stage of promoting explosion,the effect of nickel wire is weaker than that of aluminum wire,in the explosion suppression stage,the explosion suppression effect of nickel wire is better than that of aluminum wire.The inhibition or promotion effect of metal materials on gas explosion is determined by the concentration and properties of gas and the filling amount of materials.Changing the filling amount of materials will lead to changes in the performance of inhibiting/promoting hydrogen explosion.The simulation results show that•H,•O,and•OH are the key free radicals in the process of hydrogen explosion,and the change of reaction rate and sensitivity directly determine the explosion intensity.Among the main elementary reactions that affect hydrogen explosion,R2 has the greatest impact on the formation rate of hydrogen,and R1 has the greatest impact on hydrogen and temperature during explosion.The main elementary reactions that affect the change of temperature sensitivity have a promoting effect on explosion.The influence mechanism of different magnetic wires on hydrogen explosion was revealed by experiment and numerical simulation.