WOOD THERMODEGRADATION: EXPERIMENTAL ANALYSIS AND MODELING OF MASS LOSS KINETICS

A. Pétrissans, R. Younsi, M. Chaouch, P. Gérardin, M. Pétrissans

Abstract


In this study, heat treatment was carried out in a relatively low temperature (230˚C). Mass losskinetics was studied using equipment, specially conceived to measure sample’s mass during the thermaltreatment. Laboratory experiments were performed for heating rates of 1˚C min-1. Mathematical modelfor kinetics of pyrolysis process was used and validated. During the pyrolysis of dry wood samples underinert atmosphere, measurements of temperature distribution and dynamic weight loss were performed.Five different wood species Fagus sylvatica (Beech), Populus nigra (Poplar), Fraxinus excelsior(Ash), Pinus sylvestris (Pine) and Abies pectinata (Silver Fir) were investigated. The unsteady-statemathematical model equations were solved numerically using the commercial package Femlab 2.0.A detailed discussion of the computational model and the solution algorithm is given. The validity ofdifferent model assumptions was analyzed. Experimental results were compared with those calculatedby the model. Acceptable agreement was achieved.

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