Analysis of Kinetic Characteristics of Merey Crude oil Pyrolysis by Isoconversion Method

Abstract

As an important chemical reaction during in-situ combustion, pyrolysis reaction is related to the whole combustion process. To understand the kinetic characteristics of the pyrolysis reaction more clearly, three models, FWO, Friedman and KAS, were used to fit and calculate the thermogravimetric data of Merey crude oil by three linear heating rates under air atmosphere and analyze the kinetic parameters of crude oil at different conversions. The results show that KAS model provides the fitting result similar to the FWO model, but Friedman model provides smaller result, and the FWO model provides the highest linear correlation and the most accurate calculation results among the three models; the gasification stage has the lowest activation energy, followed by low temperature oxidation stage, the pyrolysis stage has the highest activation energy and the highest energy consumption and is the core reaction in the whole process, and the high temperature oxidation stage has a bit lower activation energy than the pyrolysis stage among the four stages of thermal reaction of Merey crude oil.