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Active constraint regions for optimal operation of chemical processes / Magnus G. Jacobsen in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11226–11236 Titre : Active constraint regions for optimal operation of chemical processes Type de document : texte imprimé Auteurs : Magnus G. Jacobsen, Auteur ; Sigurd Skogestad, Auteur Année de publication : 2011 Article en page(s) : pp. 11226–11236 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimal  operation  Chemical  processes Résumé : When designing the control structure of a chemical plant, with optimal operation and control in mind, it is important to know how the active set of constraints changes with disturbances.The generation of optimal active constraints regions using optimization generally is very time-consuming, and this paper discusses how to use process knowledge to minimize the need for numerical calculations—that is, minimize the number of optimization problems that must be solved. We consider the case of two disturbances, as this can be nicely represented graphically. In this paper, we study economically optimal operation of a reactor–separator–recycle process and show how the set of active constraints changes with feed flow rate and energy cost as disturbances. We also identify the economical and physical bottleneck of the process. For this case study process, we find five distinct regions with different active sets. This illustrates that, even for simple cases, the map of active constraint regions can be quite complex. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2012196?mi=uytze9&af=R&pageSize=20&searchT [...] [article] Active constraint regions for optimal operation of chemical processes [texte imprimé] / Magnus G. Jacobsen, Auteur ; Sigurd Skogestad, Auteur . - 2011 . - pp. 11226–11236. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11226–11236 Mots-clés : Optimal  operation  Chemical  processes Résumé : When designing the control structure of a chemical plant, with optimal operation and control in mind, it is important to know how the active set of constraints changes with disturbances.The generation of optimal active constraints regions using optimization generally is very time-consuming, and this paper discusses how to use process knowledge to minimize the need for numerical calculations—that is, minimize the number of optimization problems that must be solved. We consider the case of two disturbances, as this can be nicely represented graphically. In this paper, we study economically optimal operation of a reactor–separator–recycle process and show how the set of active constraints changes with feed flow rate and energy cost as disturbances. We also identify the economical and physical bottleneck of the process. For this case study process, we find five distinct regions with different active sets. This illustrates that, even for simple cases, the map of active constraint regions can be quite complex. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2012196?mi=uytze9&af=R&pageSize=20&searchT [...]