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Economic plantwide control of a C4 isomerization process / Rahul Jagtap in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11731–11743 Titre : Economic plantwide control of a C4 isomerization process Type de document : texte imprimé Auteurs : Rahul Jagtap, Auteur ; Nitin Kaistha, Auteur Année de publication : 2012 Article en page(s) : pp. 11731–11743 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Isomerization  process Résumé : Plantwide control system design for economically optimal operation over a large throughput range of a C4 isomerization process is considered. The steady-state process degrees of freedom (dofs; eight in total) are optimized for a given throughput (mode I) and maximum throughput (mode II). At maximum throughput, all of the steady-state dofs are exhausted in driving as many constraints (inequality/equality) active. For this process, it is possible to synthesize a simple decentralized plantwide control system (CS1) for tight control of all of the active constraints at maximum throughput with negligible back-off due to transients with satisfactory inventory regulation and process stabilization. A unique feature of CS1 is the location of the throughput manipulator (TPM) inside the plant (in contrast to that at the process feed) and its relocation due to input saturation in a split range arrangement. A comparison with the conventional structure (CS2) with TPM at the process feed and conventional overrides for handling constraints demonstrates the economic and dynamic superiority of CS1. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3001293 [article] Economic plantwide control of a C4 isomerization process [texte imprimé] / Rahul Jagtap, Auteur ; Nitin Kaistha, Auteur . - 2012 . - pp. 11731–11743. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11731–11743 Mots-clés : Isomerization  process Résumé : Plantwide control system design for economically optimal operation over a large throughput range of a C4 isomerization process is considered. The steady-state process degrees of freedom (dofs; eight in total) are optimized for a given throughput (mode I) and maximum throughput (mode II). At maximum throughput, all of the steady-state dofs are exhausted in driving as many constraints (inequality/equality) active. For this process, it is possible to synthesize a simple decentralized plantwide control system (CS1) for tight control of all of the active constraints at maximum throughput with negligible back-off due to transients with satisfactory inventory regulation and process stabilization. A unique feature of CS1 is the location of the throughput manipulator (TPM) inside the plant (in contrast to that at the process feed) and its relocation due to input saturation in a split range arrangement. A comparison with the conventional structure (CS2) with TPM at the process feed and conventional overrides for handling constraints demonstrates the economic and dynamic superiority of CS1. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3001293

Plantwide control for economic optimum operation of a recycle process with side reaction / Rahul Jagtap in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8571-8584 Titre : Plantwide control for economic optimum operation of a recycle process with side reaction Type de document : texte imprimé Auteurs : Rahul Jagtap, Auteur ; Nitin Kaistha, Auteur Année de publication : 2011 Article en page(s) : pp. 8571-8584 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Process  control Résumé : Plantwide control system design for the economically optimum operation of a recycle process with side reaction, consisting of a continuous stirred tank reactor (CSTR) followed by two distillation columns, is studied. The steady-state operating profit is maximized over a large throughput range for an existing design. As the throughput is increased, constraints progressively become active until maximum throughput is reached where all the steady-state degrees of freedom are exhausted. A strategy of moving the throughput manipulator to the next constraint to become active as the throughput is increased is used to improve the control of the active constraint. This minimizes the variability and hence the back-off in the active constraint variables for economically optimal operation. The plantwide control system (CS1) so obtained is quantitatively compared with three other more conventional control systems (CS2–CS4) in terms of the required back-off to avoid hard constraint violation for disturbances. Results show that the most economical operation is achieved using CS1 and the traditional practice of fixing throughput at the feed (CS4) gives the highest (up to 7%) economic loss. A simple switching scheme to transition from low to maximum throughput is also demonstrated. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346898 [article] Plantwide control for economic optimum operation of a recycle process with side reaction [texte imprimé] / Rahul Jagtap, Auteur ; Nitin Kaistha, Auteur . - 2011 . - pp. 8571-8584. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8571-8584 Mots-clés : Process  control Résumé : Plantwide control system design for the economically optimum operation of a recycle process with side reaction, consisting of a continuous stirred tank reactor (CSTR) followed by two distillation columns, is studied. The steady-state operating profit is maximized over a large throughput range for an existing design. As the throughput is increased, constraints progressively become active until maximum throughput is reached where all the steady-state degrees of freedom are exhausted. A strategy of moving the throughput manipulator to the next constraint to become active as the throughput is increased is used to improve the control of the active constraint. This minimizes the variability and hence the back-off in the active constraint variables for economically optimal operation. The plantwide control system (CS1) so obtained is quantitatively compared with three other more conventional control systems (CS2–CS4) in terms of the required back-off to avoid hard constraint violation for disturbances. Results show that the most economical operation is achieved using CS1 and the traditional practice of fixing throughput at the feed (CS4) gives the highest (up to 7%) economic loss. A simple switching scheme to transition from low to maximum throughput is also demonstrated. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346898