Gasification of continuous wood char bed: Modelling and experimental approach

Teixeira Gabriel, Van De Steene Laurent, Salvador Sylvain, Gelix Franck, Dirion Jean-Louis, Paviet Frédéric. 2014. Gasification of continuous wood char bed: Modelling and experimental approach. In : iconBM 2014. Ranzi Eliseo (ed.), Kohse-Höinghaus Katharina (ed.). Milan : AIDIC, 247-252. (Chemical Engineering Transactions, 37, 37) ISBN 978-88-95608-28-0 International Conference on BioMass, Florence, Italie, 5 Mai 2014/7 Mai 2014.

Résumé : The current paper presents a study combining experimentation and modelling of char gasification in a continuous fixed bed reactor. The char bed gasification was experimentally characterized using the Continuous Fixed Bed reactor (CFiB) at CIRAD (Montpellier, France). This reactor replicates the gasification zone taking place in the co-current, multi-stage gasification technology. It is instrumented to specifically allow the measurement of thermal and chemical profiles: measurements of temperature, pressure, and gas composition are performed every 10 cm along the bed. We also investigate the char bed compaction during gasification. For this purpose, a char bed sampling was carried out to measure char bed density and particle velocities along the char bed. A model of wood char gasification in a continuous fixed bed reactor was thus developed using COMSOL software. It couples heat and mass transfer phenomena with heterogeneous and homogenous chemical reactions taking place inside the bed. In particular, this model considers char bed compaction to predict evolution of char bed density and velocity. As an innovative approach, three simple functions to calculate char particle conversion rate of the heterogeneous reactions were proposed.

Mots-clés Agrovoc : gazéification, carbonisation du bois, technologie du bois, charbon de bois, Réacteur à lit fluidisé, réaction biochimique

Mots-clés libres : Gasification, Wood, Fixed bed

Classification Agris : K50 - Technologie des produits forestiers

Auteurs et affiliations

• Teixeira Gabriel, VERI-VEOLIA (FRA) - auteur correspondant
• Van De Steene Laurent, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0003-4737-3667
• Salvador Sylvain, Ecole des mines d'Albi (FRA)
• Gelix Franck, VERI-VEOLIA (FRA)
• Dirion Jean-Louis, Ecole des mines d'Albi (FRA)
• Paviet Frédéric, GEPEA (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/594235/)

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