Methane Explosion Characteristics Based on Different Initial Pressures of Constant Volume Combustion Bombs

CHEN Haochi; XU Jingde; SONG Xiaoting

doi:10.3969/j.issn.1672-7169.2018.02.012

Abstract：There are various storage tanks in the industrial production site, especially in the natural gas cylinder tank area. The natural gas explosion shock waves generate projectile debris and form a domino effect. In this paper, using a constant volume incendiary bomb explosion experimental device, by setting different initial pressures and methane concentration conditions, experimental studies were carried out on the different methane explosion characteristics under different initial pressures. The results show that the initial pressure increases and the maximum explosion of methane-air mixture is achieved. Increased pressure increases explosion risk. The initial pressure has the greatest impact on the maximum pressure of low-concentration methane explosion. The positive feedback effect of the mixed gas between the equivalence ratio concentration and the lower explosion limit on the increase of the initial pressure causes the equivalence ratio concentration and the lower explosion limit. The increase in the maximum explosion pressure of the mixed gas is greater than the increase between the equivalence ratio concentration and the upper explosion limit, that is, the mixture gas between the equivalence ratio concentration and the lower explosion limit is higher than the initial pressure between the equivalence ratio concentration and the upper explosion limit. Analyzing the influence of initial pressure on the propagation of methane explosions has guiding significance for reducing the severity of methane explosion accidents in tank farms.