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Energies 2017, 10(7), 864; https://doi.org/10.3390/en10070864

Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl2O4) for Chemical-Looping Combustion

1
LGRE, Laboratoire Gestion des Risques, Environnement 3 bis, rue Alfred Werner, 68093 Mulhouse, France
2
IS2M, Institut de Sciences des Matériaux de Mulhouse, UMR 7361 CNRS, Université de Strasbourg, Université de Haute Alsace, 3 bis, rue Alfred Werner, 68098 Mulhouse CEDEX, France
3
IFP Energies Nouvelles, Rond-Point de l’échangeur de Solaize, BP 3, 69360 Solaize, France
*
Author to whom correspondence should be addressed.
Academic Editor: Vasily Novozhilov
Received: 3 May 2017 / Revised: 13 June 2017 / Accepted: 20 June 2017 / Published: 28 June 2017
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Abstract

This work was devoted to study experimentally and numerically the oxygen carrier (NiO/NiAl2O4) performances for Chemical-Looping Combustion applications. Various kinetic models including Shrinking Core, Nucleation Growth and Modified Volumetric models were investigated in a one-dimensional approach to simulate the reactive mass transfer in a fixed bed reactor. The preliminary numerical results indicated that these models are unable to fit well the fuel breakthrough curves. Therefore, the oxygen carrier was characterized after several operations using Scanning Electronic Microscopy (SEM) coupled with equipped with an energy dispersive X-ray spectrometer (EDX). These analyses showed a layer rich in nickel on particle surface. Below this layer, to a depth of about 10 µm, the material was low in nickel, being the consequence of nickel migration. From these observations, two reactive sites were proposed relative to the layer rich in nickel (particle surface) and the bulk material, respectively. Then, a numerical model, taking into account of both reactive sites, was able to fit well fuel breakthrough curves for all the studied operating conditions. The extracted kinetic parameters showed that the fuel oxidation was fully controlled by the reaction and the effect of temperature was not significant in the tested operating conditions range. View Full-Text
Keywords: NiO reactivity; nickel migration; chemical looping combustion; fixed bed reactor; modelling NiO reactivity; nickel migration; chemical looping combustion; fixed bed reactor; modelling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Blas, L.; Dutournié, P.; Jeguirim, M.; Josien, L.; Chiche, D.; Bertholin, S.; Lambert, A. Numerical Modeling of Oxygen Carrier Performances (NiO/NiAl2O4) for Chemical-Looping Combustion. Energies 2017, 10, 864.

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