Documents disponibles écrits par cet auteur

Hybrid modeling of methane reformers. 1. a metamodel for the effectiveness factor of a catalyst pellet with complex geometry / André Luis Alberton in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9369–9375 Titre : Hybrid modeling of methane reformers. 1. a metamodel for the effectiveness factor of a catalyst pellet with complex geometry Type de document : texte imprimé Auteurs : André Luis Alberton, Auteur ; Marcio Schwaab, Auteur ; Carlos Eduardo Fontes, Auteur Année de publication : 2010 Article en page(s) : pp. 9369–9375 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Methane  steam  reforming  Effectiveness  factors  Computational  fluid  dynamic Résumé : In this work, effectiveness factors for methane steam reforming reactions were obtained by solving mass and heat balance equations inside catalytic pellets for different reaction conditions and catalytic pellet geometries with the help of CFD (computational fluid dynamic) techniques. CFD computations were performed for real particle geometries and real kinetic rate expressions as described in the technical literature. A linear correlation was found between the effectiveness factor and the area/volume ratio, which characterizes the methane steam reforming as a diffusion-controlled process. The slopes of the straight lines depend of the external reaction conditions, thermal conductivity, and effective diffusivity. On the basis of the CFD results, empirical metamodels were built to represent effectiveness factors for methane steam reforming reactions at different reaction conditions. The metamodels can be easily inserted into a reactor model for simulation of the full industrial process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801830q [article] Hybrid modeling of methane reformers. 1. a metamodel for the effectiveness factor of a catalyst pellet with complex geometry [texte imprimé] / André Luis Alberton, Auteur ; Marcio Schwaab, Auteur ; Carlos Eduardo Fontes, Auteur . - 2010 . - pp. 9369–9375. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9369–9375 Mots-clés : Methane  steam  reforming  Effectiveness  factors  Computational  fluid  dynamic Résumé : In this work, effectiveness factors for methane steam reforming reactions were obtained by solving mass and heat balance equations inside catalytic pellets for different reaction conditions and catalytic pellet geometries with the help of CFD (computational fluid dynamic) techniques. CFD computations were performed for real particle geometries and real kinetic rate expressions as described in the technical literature. A linear correlation was found between the effectiveness factor and the area/volume ratio, which characterizes the methane steam reforming as a diffusion-controlled process. The slopes of the straight lines depend of the external reaction conditions, thermal conductivity, and effective diffusivity. On the basis of the CFD results, empirical metamodels were built to represent effectiveness factors for methane steam reforming reactions at different reaction conditions. The metamodels can be easily inserted into a reactor model for simulation of the full industrial process. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801830q

Hybrid modeling of methane reformers. 2. modeling of the industrial reactors / Marcio Schwaab in Industrial & engineering chemistry research, Vol. 48 N° 21 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9376–9382 Titre : Hybrid modeling of methane reformers. 2. modeling of the industrial reactors Type de document : texte imprimé Auteurs : Marcio Schwaab, Auteur ; André Luis Alberton, Auteur ; Carlos Eduardo Fontes, Auteur Année de publication : 2010 Article en page(s) : pp. 9376–9382 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Methane  reformers  Industrial  reactors Résumé : The steam reforming of methane is the main route for industrial production of hydrogen, used afterward for energy generation and production of chemicals. However, modeling of industrial methane reformers is not an easy task, due to the complex geometries of the employed catalyst pellets. The complex geometries are required to improve the contact between the gas phase and the solid catalyst. In this work a one-dimensional pseudohomogeneous model with axial mass and heat dispersion is used to model the tubular industrial reactors. The effect of the complex catalyst geometry of the pellets is considered with the help of empirical metamodels developed a priori for the effectiveness factors, based on CFD modeling of heat and mass balances inside pellets with different shapes and subject to distinct reactions conditions. It is shown that the proposed model can be successfully applied for simulation and design of industrial reformers, allowing for analysis of the effects introduced by distinct catalyst geometries on the performances of industrial operations. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801831m [article] Hybrid modeling of methane reformers. 2. modeling of the industrial reactors [texte imprimé] / Marcio Schwaab, Auteur ; André Luis Alberton, Auteur ; Carlos Eduardo Fontes, Auteur . - 2010 . - pp. 9376–9382. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 21 (Novembre 2009) . - pp. 9376–9382 Mots-clés : Methane  reformers  Industrial  reactors Résumé : The steam reforming of methane is the main route for industrial production of hydrogen, used afterward for energy generation and production of chemicals. However, modeling of industrial methane reformers is not an easy task, due to the complex geometries of the employed catalyst pellets. The complex geometries are required to improve the contact between the gas phase and the solid catalyst. In this work a one-dimensional pseudohomogeneous model with axial mass and heat dispersion is used to model the tubular industrial reactors. The effect of the complex catalyst geometry of the pellets is considered with the help of empirical metamodels developed a priori for the effectiveness factors, based on CFD modeling of heat and mass balances inside pellets with different shapes and subject to distinct reactions conditions. It is shown that the proposed model can be successfully applied for simulation and design of industrial reformers, allowing for analysis of the effects introduced by distinct catalyst geometries on the performances of industrial operations. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801831m