Study Of The Explosion Limits Of C₃/H₂/O₂ Mixture

This thesis studies by experimental and simulation the issue of combustible gas explosion limits involved in the propane dehydrogenation process. The results show that, for hydrocarbon gases such as methane, ethane, ethylene, propane, propylene, etc., the second inflection point on the adiabatic combustion pressure rise curve, which corresponds to the maximum equilibrium hydrogen concentration and indicates the shifting from combustion reaction to other reactions such as methanation reaction, cracking reaction etc, This can be used to determine the upper explosion limit. The thermal conductivity of the gas mixture can be used to adjust the calculated explosion limit. However, this method is not valid for mixture of two combustible gases that are very different in combustion kinetics. According to the equilibrium composition propane dehydrogenation, we simulate the adiabatic combustion pressure rise at different industrial reaction temperature under different oxygen concentration. The results show that as long as the oxygen concentration is less than 40%, the theoretical pressure will be lower 3.2 atm. This provides the basis for the design of oxygen mixers. In the propane dehydrogenation reaction system, due to the introduction of oxygen for hydrogen combustion does not exceed the stochiometric amount for complete hydrogen combustion, the mixture will not fall within the explosion envelope.