A Generalized Model for Description of Biomass Decomposition and its Application

Kinetic model for prediction of conversion rate is crucial for research and development of biomass pyrolysis. However, the previous kinetic models are always over-reliance to the thermogravimetric data, the obtained kinetic parameters can not be generally used. This paper presents a generalized kinetic model for all the commonly used reaction mechanisms of solid fuels decomposition, which breaks the limitation of the reliance on the specific experimental data. The new model is independent of activation energy, pre-exponential factor or heating rate, it reveals the pyrolysis process in a statistical way. The expression of the generalized model for first-order reaction mechanism is consistent with the standardized general extreme value distribution. Based on the generalized model, a new equation with only one kinetic parameter as inputs for prediction the conversion rate of biomass pyrolysis have been proposed. The prediction results of the conversion rate show more precise than those from the typical Arrhenius model. Furthermore, the reaction order mechanisms and the contracting geometry mechanisms are proven suitable for Artemisia stem pyrolysis.