Modelling non-isothermal kinetics of biomass prepyrolysis at low pressure

The object of this work was the investigation of the kinetics of wood sawdust prepyrolysis. The thermochemical decomposition of the sawdust took place between 250 and 450°C in a laboratory reactor of which the basic thermal characteristics were also studied. The experimental results were processed b...

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Bibliographic Details
Published in:Bioresource technology 1998-03, Vol.63 (3), p.261-266
Main Authors: Koullas, D.P., Nikolaou, N., Koukios, E.G.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Applied sciences
biofuels
Biological and medical sciences
Biomass
charification
devolatilisation
Energy
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
kinetics
lignocellulosics
Natural energy
prepyrolysis
thermochemical degradation
Use of agricultural and forest wastes. Biomass use, bioconversion
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Summary:The object of this work was the investigation of the kinetics of wood sawdust prepyrolysis. The thermochemical decomposition of the sawdust took place between 250 and 450°C in a laboratory reactor of which the basic thermal characteristics were also studied. The experimental results were processed by non-linear regression. Both degradation and charification were found to follow first order reactions. The activation energies of the degradation and charification reactions were estimated at 111 and 68·7 kJ/mole, respectively. Furthermore, proximate analysis of the partially charified solid product has shown that the volatile matter content of the solid biofuel produced was reduced by 35% after the process, whereas its gross calorific value was increased by 17%.
ISSN:0960-8524
1873-2976
DOI:10.1016/S0960-8524(97)00128-4