Kinetic study of forest fuels by TGA: Model free kinetic approach for the prediction of phenomena

Valérie Leroy (1, 2) , Dominique Cancellieri (2) , Eric Leoni (2) , Jean Louis Rossi (2)

1 ICARE - Institut de Combustion, Aérothermique, Réactivité et Environnement
2 SPE - Sciences pour l'environnement

The kinetics of thermal decomposition of a forest fuel was studied by thermogravimetry. Experiments were monitored under air and non-isothermal conditions from 400 to 900 K. We used a classical modelfree method, the Kissinger-Akahira-Sunose (KAS) method to calculate the activation energy vs. the conversion degree of the reaction on the whole temperature domain. Analyses were performed at 10, 20 and 30 K/min. As expected, the complex structure of lignocellulosic fuels involved several steps with different energies in the degradation processes. The algorithm developed here, allows the calculation and the simulation of the solid temperature at different conversion degree for various heating rates. The good correlation between experiments and simulations validated the proposed algorithm. Then, kinetics parameters were used to perform simulations up to heating rates outside the functioning range of the thermal analyser.

Mots clés: Model-free kinetic; Thermal degradation; Oxidation; Forest fuels

Domaines: Sciences de l'environnement; Ingénierie de l'environnement

Valérie Leroy, Dominique Cancellieri, Eric Leoni, Jean Louis Rossi. Kinetic study of forest fuels by TGA: Model free kinetic approach for the prediction of phenomena. Thermochimica Acta, 2010, 497, pp.1-6. ⟨10.1016/j.tca.2009.08.001⟩. ⟨hal-00547599⟩