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Detailed design of multiproduct batch plants considering production scheduling / Yanina Fumero in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6146-6160 Titre : Detailed design of multiproduct batch plants considering production scheduling Type de document : texte imprimé Auteurs : Yanina Fumero, Auteur ; Gabriela Corsano, Auteur ; Jorge M. Montagna, Auteur Année de publication : 2011 Article en page(s) : pp. 6146-6160 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Scheduling  Production  Batchwise  Design Résumé : Most previous approaches for the design of multiproduct batch plants have assumed the simplest scheduling policy. In order to simplify the formulation and take into account that many times demands are uncertain, they have used single product campaigns to determine the plant configuration and select the unit sizes. From the commercial point of view, this production mode is not realistic: for example, huge inventories should be kept to support this approach. However, when a stable context can be assured, the simultaneous resolution of design and a more detailed scheduling allows assessing different trade-offs. This article presents a new mixed integer linear programming (MILP) formulation assuming mixed product campaigns. Now, the composition and the sequence of the batches in the campaign must be determined as well as the assignment of batches to units when parallel units are used. Taking into account that the plant configuration is simultaneously obtained, the scheduling problem must be solved without knowing the number of available units and their sizes. Several examples are presented in order to show the performance of the proposed approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158914 [article] Detailed design of multiproduct batch plants considering production scheduling [texte imprimé] / Yanina Fumero, Auteur ; Gabriela Corsano, Auteur ; Jorge M. Montagna, Auteur . - 2011 . - pp. 6146-6160. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6146-6160 Mots-clés : Scheduling  Production  Batchwise  Design Résumé : Most previous approaches for the design of multiproduct batch plants have assumed the simplest scheduling policy. In order to simplify the formulation and take into account that many times demands are uncertain, they have used single product campaigns to determine the plant configuration and select the unit sizes. From the commercial point of view, this production mode is not realistic: for example, huge inventories should be kept to support this approach. However, when a stable context can be assured, the simultaneous resolution of design and a more detailed scheduling allows assessing different trade-offs. This article presents a new mixed integer linear programming (MILP) formulation assuming mixed product campaigns. Now, the composition and the sequence of the batches in the campaign must be determined as well as the assignment of batches to units when parallel units are used. Taking into account that the plant configuration is simultaneously obtained, the scheduling problem must be solved without knowing the number of available units and their sizes. Several examples are presented in order to show the performance of the proposed approach. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158914

Scheduling of multistage multiproduct batch plants operating in a campaign - mode / Yanina Fumero in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3988–4000 Titre : Scheduling of multistage multiproduct batch plants operating in a campaign - mode Type de document : texte imprimé Auteurs : Yanina Fumero, Auteur ; Gabriela Corsano, Auteur ; Jorge M. Montagna, Auteur Année de publication : 2012 Article en page(s) : pp. 3988–4000 Note générale : Chimie industrielle Langues : Anglais (eng) Résumé : In this work, mixed integer linear programming models for scheduling multistage multiproduct batch plants operating under campaign mode are proposed. It is assumed that each plant stage includes identical parallel units operating out of phase. Given the plant topology and the number of batches of each product to be processed in the campaign, the objective is assigning batches to units in each stage in order to minimize the cycle time of the campaign. An asynchronous slot-based continuous-time representation for modeling the assignment of batches to units is used. These formulations require postulating a priori a suitable number of production slots for each unit that integrates the plant, which severely affects the model computational performance. Then, to reduce the computational effort, a solution strategy is proposed where a simplified model, which includes preordering constraints, is first solved. Finally, a detailed scheduling model is posed where the optimal cycle time of simplified model is used as bound for the cycle time and a novel expression for the number of proposed slots for each unit is considered. The strategy is highlighted through examples that show how the computational burden is reduced. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201757t [article] Scheduling of multistage multiproduct batch plants operating in a campaign - mode [texte imprimé] / Yanina Fumero, Auteur ; Gabriela Corsano, Auteur ; Jorge M. Montagna, Auteur . - 2012 . - pp. 3988–4000. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3988–4000 Résumé : In this work, mixed integer linear programming models for scheduling multistage multiproduct batch plants operating under campaign mode are proposed. It is assumed that each plant stage includes identical parallel units operating out of phase. Given the plant topology and the number of batches of each product to be processed in the campaign, the objective is assigning batches to units in each stage in order to minimize the cycle time of the campaign. An asynchronous slot-based continuous-time representation for modeling the assignment of batches to units is used. These formulations require postulating a priori a suitable number of production slots for each unit that integrates the plant, which severely affects the model computational performance. Then, to reduce the computational effort, a solution strategy is proposed where a simplified model, which includes preordering constraints, is first solved. Finally, a detailed scheduling model is posed where the optimal cycle time of simplified model is used as bound for the cycle time and a novel expression for the number of proposed slots for each unit is considered. The strategy is highlighted through examples that show how the computational burden is reduced. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201757t