MEASUREMENT OF ETHANE/ETHYLENE IGNITION DELAY TIME AND KINETIC MODELING UNDER HIGH PRESSURE AND HIGH TEMPERATURE

Abstract

Abstract: In order to study the ignition characteristics of ethane/ethylene at high pressure and temperature, the variation of ignition delay time of ethane/ethylene-oxygen mixture under different operating conditions was investigated by experimental method and kinetic modeling tools. The experimental data showed that there was no self-ignite of ethylene/ethane at the pressure of 1.0 MPa and the temperature of 680-800 K, but the self-ignition of ethane/ ethylene occurred at the pressure of 2.0 MPa. The initial ignition temperature of ethylene was lower than that of ethane, and the higher the temperature was, the shorter the ignition delay time was. In addition, the analysis of sensitivity and reaction pathway of ethane and ethylene self-ignition process showed that the reactions that promoted the self-ignition of ethane was dehydrogenation and formation of .C₂H₅ and .OH radical, and the primary reactions that promoted the self-ignition of ethylene was oxidation or dehydrogenation to form active free radicals .HCO,.O,.OH,.C₂H₃. The inhibition of self-ignition of ethane and ethylene was the reaction of consuming .OH and .HO₂ to form stable compounds, and oxidative dehydrogenation was the initial step of ethylene and ethane chain, the reaction rate had a great influence on the ignition delay time.

Key words: ethane, ethylene, ignition delay, chemical kinetics

References

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