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Kinetic study of biomass char combustion in a low temperature fluidized bed reactor

Morin, Mathieu and Pécate, Sébastien and Hemati, Mehrdji Kinetic study of biomass char combustion in a low temperature fluidized bed reactor. (2018) Chemical Engineering Journal, 331. 265-277. ISSN 1385-8947

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Official URL: https://doi.org/10.1016/j.cej.2017.08.063

Abstract

The purpose of this work is the kinetic study of biomass char combustion in a low temperature fluidized bed reactor. This char was obtained from fast pyrolysis of beech stick in an annex batch fluidized bed reactor at 923 K and atmospheric pressure. Operating conditions of the combustion were thoroughly characterized so that the reaction takes place in isothermal conditions and a constant oxygen partial pressure. The kinetic study was performed for temperatures up to 643 K, oxygen partial pressures ranging from 5065 to 21273 Pa and cylindrical char particles (D = 4 mm and L = 9 mm). The Volumetric Model was found to be in very good agreement with experimental data. Values of activation energy and reaction order with respect to oxygen are respectively equal to 144 kJ/mol and 0.59. The reaction scheme during char combustion showed that char first reacts with oxygen to form CO which is further oxidized either at the particle surface or in the gas phase to produce CO2. Besides, it was found that the char reactivity in combustion is higher in a fluidized bed reactor compared to TGA. This was explained by diffusional effects of oxygen and CO oxidation within the crucible in the TGA.

Item Type:Article
HAL Id:hal-02134905
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Loetitia MOYA
Deposited On:21 Nov 2018 15:42

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