| Gas explosion is influenced by various factors. There are little studies about the combustible gas carbon monoxide affecting gas explosion. In view of this, the reaction mechanism of carbon monoxide in gas explosion is numerically simulated in order to enrich the inhibition theory of gas explosion from the aspects of gas explosion dynamics in this paper.The CH4 chain reaction mechanism of GRI-Mech 3.0 ?including 53 species,325 reactions? is used, and the mathematical model is established for the gas explosion in enclosed space by editing the subprogram SENKIN in the chemical kinetics software package CHEMKIN. The process of methane explosion and the changes of CO on pressure and temperature, the changing trend of the mole fractions of reactants, free radical and catastrophic gases after explosion are numerically simulated and put forward the sensitive analysis. The characteristic curve of reaction kinetics, corresponded data and the key reactions are obtained for the gas explosion in enclosed space. The results show that the process of gas explosion is a transient phenomenon with high-temperature and high-pressure; CO as the intermediate product of gas explosion participates in CH4 oxidation chain reaction while CO gas is filled in the mixture gases of CH4 and air. The gas explosion time could be delayed by inhibiting the production of CH2O and CO has a certain inhibition effect on methane explosion. On the other hand, CO is oxidized to CO2 by chain reaction so that the concentration of CO2 is increased and that of CO2 is decreased during the mixture gases after explosion. And the production of parts of catastrophic gases including NO and NOt are inhibited owing to filling CO into the mixture gases. The strength of gas explosion is affected by reactant ?CH4 and O2? volume fraction after filling the CO in the gas mixture. With the increase of CO in gas mixture, the change of temperature and pressure during the gas explosion is firstly increased and than reduced. |
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