High temperature oxidation is the main reaction type and energy source of the combustion front during in-situ combustion development of heavy oils. High temperature oxidation of heavy oils was studied by thermogravimetry, and influences of sample preparation methods (pure oils or oils mixed with SiO2) and kinetic parameter determination methods (Coats-Redfern integration, ABSW differentiation and FWO iso-conversion) on measured results of kinetic parameters were evaluated. The results showed that the combustion of pure oil samples is uneven, while for oils mixed with SiO2, pore spaces among SiO2 particles can provide O2 with diffusion channels, resulting in an even reaction in combustion. Therefore, the kinetic analysis experiment is effective due to the even combustion of samples. When kinetic parameters for high temperature oxidation of heavy oils are derived from thermogravimetric curves, there exist certain errors in kinetic parameters fitted by a single scanning-rate method (Coats-Redfern integration and ABSW differentiation). Whereas FWO iso-conversional method can avoid errors derived from simplified hypothetic mechanism functions, thus the method, capable of being applied to intrinsic kinetics researches of oil-coke combustion, can provide accurate kinetic parameters for the in-situ combustion development of heavy, ultra-heavy and extra-heavy oils.
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2013, Vol. 34 
