Oxidative pyrolysis of wood chips and of wood pellets in a downdraft continuous fixed bed reactor

Daouk Elias, Van de Steene Laurent, Paviet Frédéric, Martin Eric, Valette Jérémy, Salvador Sylvain. 2017. Oxidative pyrolysis of wood chips and of wood pellets in a downdraft continuous fixed bed reactor. Fuel, 196 : 408-418.

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

Résumé : In air staged gasification and advanced carbonization processes, oxidative pyrolysis occurs in downdraft continuous fixed bed reactors. An oxidation zone separates the virgin fuel from the resulting char and propagates upward. Here, the oxidation zone was stabilized at a fixed elevation in a 20 cm I.D. fixed bed reactor using wood chips or wood pellets. In controlled continuous operating mode, we investigated the impact of air flux and bed bulk density on the behavior of the oxidation zone in terms of wood consumption, and yields of char, gas and tars. An air:wood mass ratio of 0.7 was measured and in our operating conditions, and was not sensitive to air mass flux and bed density. With oxidative pyrolysis, yields of organic condensates were lower than with allothermal pyrolysis, whereas the production of pyrolysis water and permanent gases increased. Finally, the oxidation zone was shown to be flat and horizontal in a wood pellet bed but inclined in a wood chip bed.

Mots-clés Agrovoc : bois, particule de bois, déchet de bois, granule, pyrolyse, gazéification, Réacteur à lit fluidisé, carbonisation du bois, oxydation, combustion, rendement, charbon de bois, bioénergie

Classification Agris : P06 - Sources d'énergie renouvelable
K50 - Technologie des produits forestiers

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

Auteurs et affiliations

• Daouk Elias, GEPEA (FRA)
• Van de Steene Laurent, CIRAD-PERSYST-UPR BioWooEB (VNM) ORCID: 0000-0003-4737-3667
• Paviet Frédéric, GEPEA (FRA)
• Martin Eric, CIRAD-PERSYST-UPR BioWooEB (REU)
• Valette Jérémy, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0009-0000-3371-6417
• Salvador Sylvain, Ecole des mines d'Albi (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/583835/)

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