Study On The Numerical Simulation Of N₂、CO₂&H₂O Inhibiting Gas Explosion In Enclosed Space

Gas Explosion is complicated and destructive extremely, and it is the major problems ofcoal mine in production safety to be solved imperatively.In view of this, the paper dedicated tothe reaction mechanisms are mainly studied on N₂, H₂O and CO₂participating in the process ofgas explosion in this paper. It can provide the theoretical support for the gas explosionprevention and suppression from the point of gas explosion reaction kinetics mechanism.The CH4combustion reaction mechanism of GRI-Mech3.0（including53species,325reactions） is used in this paper, and the mathematical model is established for methane explosionin enclosed space by editing the subprogram SENKIN in the chemical kinetics software package.CHEMKIN. The process of methane explosion and the changes of inert gas （N₂,CO₂,H₂O） onpressure and temperature, the variational currents of the mole fractions of reactants, theconcentration change of the free radical in the gas explosion process, and the mole fractions ofcatastrophic gases after explosion are numerically simulated and put forward the sensitiveanalysis. The characteristic curve of reaction kinetics, corresponded data and the key reactionsare obtained for the gas explosion in enclosed space. The results show that the process of gasexplosion is a transient phenomenon with high-temperature and high-pressure; the gas explosiontime can be delay effectively and the concentration of chemical reaction center and catastrophicgases after explosion are reduced owing to filling the inert gases （N₂,CO₂,H₂O） in the gasmixture. Therefore, the strength and the danger of gas explosion are effectively reduced. It canbe seen that the inert gases have a certain inhibition effect on the methane explosion. As for asreducing the strength of gas explosion is concerned, the inhibition effect of CO₂is more apparentcompared with H₂O and N₂.As for as reducing the concentration of catastrophic gases after gasexplosion is concerned. the inhibition effect of H₂O is more apparent compared with CO₂andN₂.