Coke Combustion Kinetics of Hot Carrier in Fluid Thermal Conversion of Oil Sand

The coke combustion of hot carrier in fluid thermal conversion of oil sand was studied in a fixed bed microreactor,and the apparent kinetic equation and process conditions for coke combustion were obtained.The results showed that the coke combustion rate was in second order with respect to carbon mass fraction and in first order with respect to oxygen partial pressure,and the relation of reaction rate constant and temperature was consistent with Arrhenius equation.The reaction order of carbon in coke combustion of hot carrier was different from that of cracking catalyst regeneration and other processes,and the apparent activation energy E_a in coke combustion of hot carrier was much less than that of catalyst regeneration in FCC process.In coke combustion of hot carrier,the existence of alkali metal in mineral increased the reaction rate of coke combustion,changed the reaction order of carbon in coke combustion,and decreased the combustion apparent activation energy E_a.The molar ratio of CO_2 and CO in products of coke combustion was considered as a function of combustion temperature,which decreased with the increase of combustion temperature from 600℃to 720℃,and increased greatly with the temperature when the combustion temperature exceeded 720℃.