Les Inscriptions à la Bibliothèque sont ouvertes en
ligne via le site: https://biblio.enp.edu.dz
Les Réinscriptions se font à :
• La Bibliothèque Annexe pour les étudiants en
2ème Année CPST
• La Bibliothèque Centrale pour les étudiants en Spécialités
A partir de cette page vous pouvez :
Retourner au premier écran avec les recherches... |
Détail de l'auteur
Auteur Anthony G. Dixon
Documents disponibles écrits par cet auteur
Affiner la rechercheCatalyst deactivation in 3D CFD resolved particle simulations of propane dehydrogenation / Mohsen Behnam in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010)
[article]
in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10641-10650
Titre : Catalyst deactivation in 3D CFD resolved particle simulations of propane dehydrogenation Type de document : texte imprimé Auteurs : Mohsen Behnam, Auteur ; Anthony G. Dixon, Auteur ; Michiel Nijemeisland, Auteur Année de publication : 2011 Article en page(s) : pp. 10641-10650 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dehydrogenation Computational fluid dynamics Deactivation Catalyst Résumé : Catalyst deactivation by carbon deposition has been investigated for the dehydrogenation of propane to propene on a Cr2O3/Al2O3 catalyst. Computational fluid dynamics was used to couple the 3D transport and reaction processes occurring inside the cylindrical pellet to the gas flow around the pellet. The pellet scale reaction and carbon laydown are shown to be strongly affected by the bed scale tube wall heat flux supplied for the endothermic reactions, and the species distributions on the pellet surface are also affected by the case of reactant access to the particle. The development of particle internal gradients and carbon accumulation are illustrated for the early stages of deactivation. Carbon deposition is initially strongest in the high temperature regions close to the tube wall. As time progresses, the increased deactivation caused by the carbon acts to reduce all rates of reaction, and propene production and coke formation shift to other regions of the pellet. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447957 [article] Catalyst deactivation in 3D CFD resolved particle simulations of propane dehydrogenation [texte imprimé] / Mohsen Behnam, Auteur ; Anthony G. Dixon, Auteur ; Michiel Nijemeisland, Auteur . - 2011 . - pp. 10641-10650.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10641-10650
Mots-clés : Dehydrogenation Computational fluid dynamics Deactivation Catalyst Résumé : Catalyst deactivation by carbon deposition has been investigated for the dehydrogenation of propane to propene on a Cr2O3/Al2O3 catalyst. Computational fluid dynamics was used to couple the 3D transport and reaction processes occurring inside the cylindrical pellet to the gas flow around the pellet. The pellet scale reaction and carbon laydown are shown to be strongly affected by the bed scale tube wall heat flux supplied for the endothermic reactions, and the species distributions on the pellet surface are also affected by the case of reactant access to the particle. The development of particle internal gradients and carbon accumulation are illustrated for the early stages of deactivation. Carbon deposition is initially strongest in the high temperature regions close to the tube wall. As time progresses, the increased deactivation caused by the carbon acts to reduce all rates of reaction, and propene production and coke formation shift to other regions of the pellet. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447957 CFD method to couple three - dimensional transport and reaction inside catalyst particles to the fixed bed flow field / Anthony G. Dixon in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010)
[article]
in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9012–9025
Titre : CFD method to couple three - dimensional transport and reaction inside catalyst particles to the fixed bed flow field Type de document : texte imprimé Auteurs : Anthony G. Dixon, Auteur ; M. Ertan Taskin, Auteur ; Michiel Nijemeisland, Auteur Année de publication : 2010 Article en page(s) : pp. 9012–9025 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Computational fluid dynamics Catalyst particles Flow field Résumé : A new method is presented to couple the fluid flow in a fixed bed to the transport and reaction inside a catalyst particle, using computational fluid dynamics (CFD). The particle is modeled as solid, allowing no-slip surface flow boundary conditions to be used. Species transport inside the particle is represented by user-defined scalars, and the catalytic reactions are represented by user-defined functions. The new method is validated using standard cases for which exact results are known. Previous work has used a porous representation of the catalyst particle, which results in inaccurate temperature and species profiles due to an artifact of convective flux across the particle−fluid interface. This also gives incorrect values of the particle-to-fluid heat transfer coefficient, compared to standard correlations. Simulation results are presented for methane steam reforming using spherical particles in a wall segment, under tube inlet and midtube conditions, to illustrate the solid particle method. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100298q [article] CFD method to couple three - dimensional transport and reaction inside catalyst particles to the fixed bed flow field [texte imprimé] / Anthony G. Dixon, Auteur ; M. Ertan Taskin, Auteur ; Michiel Nijemeisland, Auteur . - 2010 . - pp. 9012–9025.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9012–9025
Mots-clés : Computational fluid dynamics Catalyst particles Flow field Résumé : A new method is presented to couple the fluid flow in a fixed bed to the transport and reaction inside a catalyst particle, using computational fluid dynamics (CFD). The particle is modeled as solid, allowing no-slip surface flow boundary conditions to be used. Species transport inside the particle is represented by user-defined scalars, and the catalytic reactions are represented by user-defined functions. The new method is validated using standard cases for which exact results are known. Previous work has used a porous representation of the catalyst particle, which results in inaccurate temperature and species profiles due to an artifact of convective flux across the particle−fluid interface. This also gives incorrect values of the particle-to-fluid heat transfer coefficient, compared to standard correlations. Simulation results are presented for methane steam reforming using spherical particles in a wall segment, under tube inlet and midtube conditions, to illustrate the solid particle method. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100298q Flow, transport, and reaction interactions for cylindrical particles with strongly endothermic reactions / M. Ertan Taskin in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010)
[article]
in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9026–9037
Titre : Flow, transport, and reaction interactions for cylindrical particles with strongly endothermic reactions Type de document : texte imprimé Auteurs : M. Ertan Taskin, Auteur ; Alexandre Troupel, Auteur ; Anthony G. Dixon, Auteur Année de publication : 2010 Article en page(s) : pp. 9026–9037 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst particles Methane steam reforming Dehydrogenation Résumé : Interactions between reaction rates, conduction, and diffusion inside catalyst particles can be complex, especially when influenced by nonuniform surface conditions produced by the flow field external to the particle, or by the highly directional temperature field near a heated tube wall. In this work, a three-dimensional, realistic flow field was coupled to species and energy balances in cylindrical catalyst particles using computational fluid dynamics (CFD). Two strongly endothermic reactions were studied: methane steam reforming and propane dehydrogenation. Detailed pellet surface and intraparticle temperature, species, and reaction rate distributions were obtained for a near-wall particle. Nonuniform and nonsymmetric surface and intraparticle variations were observed. These effects are primarily attributed to the steep temperature gradients at the tube wall, as well as depletion of the reactants in regions of low or stagnant flow where particles approach each other closely. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003619 [article] Flow, transport, and reaction interactions for cylindrical particles with strongly endothermic reactions [texte imprimé] / M. Ertan Taskin, Auteur ; Alexandre Troupel, Auteur ; Anthony G. Dixon, Auteur . - 2010 . - pp. 9026–9037.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9026–9037
Mots-clés : Catalyst particles Methane steam reforming Dehydrogenation Résumé : Interactions between reaction rates, conduction, and diffusion inside catalyst particles can be complex, especially when influenced by nonuniform surface conditions produced by the flow field external to the particle, or by the highly directional temperature field near a heated tube wall. In this work, a three-dimensional, realistic flow field was coupled to species and energy balances in cylindrical catalyst particles using computational fluid dynamics (CFD). Two strongly endothermic reactions were studied: methane steam reforming and propane dehydrogenation. Detailed pellet surface and intraparticle temperature, species, and reaction rate distributions were obtained for a near-wall particle. Nonuniform and nonsymmetric surface and intraparticle variations were observed. These effects are primarily attributed to the steep temperature gradients at the tube wall, as well as depletion of the reactants in regions of low or stagnant flow where particles approach each other closely. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003619 Flow, transport, and reaction interactions in shaped cylindrical particles for steam methane reforming / Anthony G. Dixon in Industrial & engineering chemistry research, Vol. 51 N° 49 (Décembre 2012)
[article]
in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 15839-15854
Titre : Flow, transport, and reaction interactions in shaped cylindrical particles for steam methane reforming Type de document : texte imprimé Auteurs : Anthony G. Dixon, Auteur ; Justin Boudreau, Auteur ; Anne Rocheleau, Auteur Année de publication : 2013 Article en page(s) : pp. 15839-15854 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reforming Water vapor Transport process Résumé : Complex interactions between steam methane reforming reaction rates, conduction, and diffusion inside cylindrical catalyst particles with holes, and the external flow and temperature fields near the heated tube wall were shown in detail using computational fluid dynamics and compared to prior work on full cylinders. This work highlights the differences caused by the particle features. Simulations were done under industrial tube inlet conditions at a constant pressure drop for one-, three-, four-, and six-hole cylinders. Heat and mass fluxes were within 10% for all particle surfaces; the holes provided the reactant good access to the particles. The six-hole catalyst particles offered the best temperature distribution and reaction rate. However, the four-hole particles gave a higher mass flow rate and lower tube-wall temperature for a set pressure drop. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732109 [article] Flow, transport, and reaction interactions in shaped cylindrical particles for steam methane reforming [texte imprimé] / Anthony G. Dixon, Auteur ; Justin Boudreau, Auteur ; Anne Rocheleau, Auteur . - 2013 . - pp. 15839-15854.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 49 (Décembre 2012) . - pp. 15839-15854
Mots-clés : Reforming Water vapor Transport process Résumé : Complex interactions between steam methane reforming reaction rates, conduction, and diffusion inside cylindrical catalyst particles with holes, and the external flow and temperature fields near the heated tube wall were shown in detail using computational fluid dynamics and compared to prior work on full cylinders. This work highlights the differences caused by the particle features. Simulations were done under industrial tube inlet conditions at a constant pressure drop for one-, three-, four-, and six-hole cylinders. Heat and mass fluxes were within 10% for all particle surfaces; the holes provided the reactant good access to the particles. The six-hole catalyst particles offered the best temperature distribution and reaction rate. However, the four-hole particles gave a higher mass flow rate and lower tube-wall temperature for a set pressure drop. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732109