Étude expérimentale et modélisation de la cinétique de combustion du coke

Abstract

Experimental study and modelling of coke combustion kinetics. The study of the coke combustion kinetics has been achieved by using isothermal thermogravimetry analysis in the 550–1100 °C temperature range. It has been shown that for the temperature varying from 550 to 750 °C the rate of reaction was controlled by chemical step, and in the temperature range from 800 to 1000 °C, it is influenced by the transfer phenomena. In the temperature range from 550–750 °C, the experimental data have been described satisfactorily by two models: the shrinking-core model and an empirical model. The empirical model has also allowed accurate fitting of experimental results, corresponding to the 800–1100 °C temperature range. The values of activation energy and oxygen reaction order parameters obtained for the two models were not significantly different: 113.53 kJ mol –1 and 0.8, respectively, for the first model and 113.94 kJ mol –1 and 0.62 for the second one. To cite this article: S. Slaoui, T. Bounahmidi, C. R. Chimie 7 (2004).