Documents disponibles écrits par cet auteur

Conventional proportional – integral (PI) control of dividing wall distillation columns / Alan Martin Zavala-Guzman in Industrial & engineering chemistry research, Vol. 51 N° 33 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10869–10880 Titre : Conventional proportional – integral (PI) control of dividing wall distillation columns : Systematic tuning Type de document : texte imprimé Auteurs : Alan Martin Zavala-Guzman, Auteur ; Héctor Hernández-Escoto, Auteur ; Salvador Hernandez, Auteur Année de publication : 2012 Article en page(s) : pp. 10869–10880 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Wall  distillation  columns Résumé : This work addresses the systematic tuning of proportional–integral (PI) controllers for dividing wall distillation columns. By following an approach of stable pole assignment to a linear dynamics that approximately describes the control system convergence, a technique results that forces the gains of controllers to be dependent on well-known parameters for each control loop: a static gain and a time constant that characterize the open-loop response of the output with respect to the control input, and a damping factor and a response velocity that outline the path of the closed-loop response. Then, it becomes possible to tune all the controllers in a simultaneous way, substantially reducing trial-and-error activities on tuning the entire control system. Via simulation, the control system performance is illustrated for disturbance rejection and set-point tracking in a representative dividing wall distillation column, showing that this tuning technique is an effective choice. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300237d [article] Conventional proportional – integral (PI) control of dividing wall distillation columns : Systematic tuning [texte imprimé] / Alan Martin Zavala-Guzman, Auteur ; Héctor Hernández-Escoto, Auteur ; Salvador Hernandez, Auteur . - 2012 . - pp. 10869–10880. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 33 (Août 2012) . - pp. 10869–10880 Mots-clés : Wall  distillation  columns Résumé : This work addresses the systematic tuning of proportional–integral (PI) controllers for dividing wall distillation columns. By following an approach of stable pole assignment to a linear dynamics that approximately describes the control system convergence, a technique results that forces the gains of controllers to be dependent on well-known parameters for each control loop: a static gain and a time constant that characterize the open-loop response of the output with respect to the control input, and a damping factor and a response velocity that outline the path of the closed-loop response. Then, it becomes possible to tune all the controllers in a simultaneous way, substantially reducing trial-and-error activities on tuning the entire control system. Via simulation, the control system performance is illustrated for disturbance rejection and set-point tracking in a representative dividing wall distillation column, showing that this tuning technique is an effective choice. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300237d

Optimization and controllability analysis of thermally coupled reactive distillation arrangements with minimum use of reboilers / Maria Vazquez-Ojeda in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5856–5865 Titre : Optimization and controllability analysis of thermally coupled reactive distillation arrangements with minimum use of reboilers Type de document : texte imprimé Auteurs : Maria Vazquez-Ojeda, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Salvador Hernandez, Auteur Année de publication : 2012 Article en page(s) : pp. 5856–5865 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Optimization  Distillation  systems Résumé : The optimal design of reactive complex distillation systems is a highly nonlinear and multivariable problem, and the objective function used as optimization criterion is generally nonconvex with several local optimums and subject to several constraints. The esterification of lauric acid and methanol is explored using thermally coupled distillation sequences with side columns and with a minimum number of reboilers. The product of the esterification can be used as biodiesel. This is a major step forward since thermally coupled reactive distillation sequences with side columns and with a minimum number of reboilers offer significant benefits, such as the following: reductions on both capital investment and operating costs due to the absence of the reboilers and higher conversion and selectivity since products are removed as they are produced as well as no occurrence of thermal degradation of the products due to a lower temperature profile in the column. In this work, we have studied the design of reactive distillation with thermal coupling with a minimum number of reboilers, using differential evolution with restrictions coupled to AspenONE Aspen Plus. Also, we have analyzed the control properties of the reactive distillation schemes studied, and the results indicate that the energy requirements and the total annual cost of the complex distillation sequences with a minimum number of reboilers are reduced significantly in comparison with the conventional reactive distillation process and can be also achieved without significant control problems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200929t [article] Optimization and controllability analysis of thermally coupled reactive distillation arrangements with minimum use of reboilers [texte imprimé] / Maria Vazquez-Ojeda, Auteur ; Juan Gabriel Segovia-Hernandez, Auteur ; Salvador Hernandez, Auteur . - 2012 . - pp. 5856–5865. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 5856–5865 Mots-clés : Optimization  Distillation  systems Résumé : The optimal design of reactive complex distillation systems is a highly nonlinear and multivariable problem, and the objective function used as optimization criterion is generally nonconvex with several local optimums and subject to several constraints. The esterification of lauric acid and methanol is explored using thermally coupled distillation sequences with side columns and with a minimum number of reboilers. The product of the esterification can be used as biodiesel. This is a major step forward since thermally coupled reactive distillation sequences with side columns and with a minimum number of reboilers offer significant benefits, such as the following: reductions on both capital investment and operating costs due to the absence of the reboilers and higher conversion and selectivity since products are removed as they are produced as well as no occurrence of thermal degradation of the products due to a lower temperature profile in the column. In this work, we have studied the design of reactive distillation with thermal coupling with a minimum number of reboilers, using differential evolution with restrictions coupled to AspenONE Aspen Plus. Also, we have analyzed the control properties of the reactive distillation schemes studied, and the results indicate that the energy requirements and the total annual cost of the complex distillation sequences with a minimum number of reboilers are reduced significantly in comparison with the conventional reactive distillation process and can be also achieved without significant control problems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200929t