Numerical and experimental studies of the pyrolysis of lignocellulosic compounds

Biomass development appears as an attractive alternative fossil fuels for both energy and fuel production. The study of the pyrolysis of lignocellulosic compounds is important for better understanding of thermochemical biomass conversion processes. These experimental results are extended to materials natural, including lignin and hemicellulose. Experiments have been made to know the nature of the propagation of the reaction of pyrolysis in wood (beech, oak). The second part of this study presents the modeling of pyrolysis process and the temperature profile as well as the pyrolysis reaction of a cylindrical wood. The novelty of this study aims to predict the temperature profile of a wood sample during the pyrolysis process. This state of affairs lies in the difficulty in assessing the proportion of each constituent, but also in the difficulty of obtaining kinetic data relating to the reactions occurring in the pyrolysis process. The thermal balances and the kinetics of reaction of each constituent of the wood have been written and solved by a home-made code, COMMENT code, which allows the representation of the temperature profile within the sample as a function of time. The comparison of the results of this modeling with the experimental temperature profiles shows good agreement. The conversion of reaction was also modeled by the model and compared with that obtained experimentally thanks to the analysis of volatile organic compounds formed during the pyrolysis. Finally, an example of recovery of the pyrolyzed material, namely the production of coals assets, is presented.