Improvement of charcoal yield by two-step pyrolysis on eucalyptus wood : A thermogravimetric study

Elyounssi Khalid, Collard François-Xavier, Ngollo Mateke Jean-Aimé, Blin Joël. 2012. Improvement of charcoal yield by two-step pyrolysis on eucalyptus wood : A thermogravimetric study. Fuel, 96 : pp. 161-167.

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Quartile : Q1, Sujet : ENGINEERING, CHEMICAL / Quartile : Q1, Sujet : ENERGY & FUELS

Abstract : In previous work, we showed that two-step biomass pyrolysis, consisting of a first low temperature step (T = 360 _C, so a low actual heating rate) until the mass loss of the solid reached approximately 50%, followed rapidly by a high temperature step (T > 600 _C, so a high actual heating rate) led to optimize charcoal yields with values of up to 40%. In this paper, we describe thermogravimetric analysis studies on eucalyptus wood and its three constituents, i.e. cellulose, xylan and lignin, in order to explain the phenomena behind these results. Two-step pyrolysis experiments were conducted in a TGA oven up to 900 _C with a first slow pyrolysis step at a low heating rate of 2 _Cmin_1, followed by a fast pyrolysis step with a heating rate of 100 _C min_1. Char yields from eucalyptus wood were increased from 18.8%, for the simple 2 _C min_1 pyrolysis, up to 22.8% when the heating rate change was operated at a temperature of 360 _C. Char yield from cellulose was also increased, though only very slightly, when the heating rate was changed in the 330-360 _C temperature range. Conversely, char yield obtained from xylan and lignin in two-step pyrolysis was always lower than that obtained by simple 2 _C min_1 pyrolysis. It appeared from this work that two-step pyrolysis of the eucalyptus sample could not be regarded and described as the result of the sum of the pyrolysis of its constituents. There was a matrix effect with interactions that promoted char formation during two-step pyrolysis. (Résumé d'auteur)

Mots-clés Agrovoc : Bois, Pyrolyse, Température, Charbon de bois, Bioénergie, Eucalyptus

Classification Agris : K50 - Processing of forest products
P06 - Renewable energy resources

Champ stratégique Cirad : Axe 2 (2005-2013) - Biomasse énergie et sociétés du sud

Auteurs et affiliations

  • Elyounssi Khalid, Centre de recherche forestière (MAR)
  • Collard François-Xavier, 2IE (BFA)
  • Ngollo Mateke Jean-Aimé, 2IE (BFA)
  • Blin Joël, CIRAD-PERSYST-UPR Biomasse-énergie (BFA) ORCID: 0000-0001-6715-2453

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