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Détail de l'auteur
Auteur Vasile Lavric
Documents disponibles écrits par cet auteur
Affiner la rechercheDynamic water network topology optimization of batch processes / Elena-Lacramioara Dogaru in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011)
[article]
in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3636–3652
Titre : Dynamic water network topology optimization of batch processes Type de document : texte imprimé Auteurs : Elena-Lacramioara Dogaru, Auteur ; Vasile Lavric, Auteur Année de publication : 2011 Article en page(s) : pp. 3636–3652 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dynamic Optimization Résumé : A water network (WN) for a batch process could be seen as a dynamic structure which changes its topology at fixed time intervals delimited by events. During each time interval, the WN could be abstracted into an oriented graph, using a secondary ranking criterion, apart from schedule. The optimization strategy implies ordering the batch units twofold: by time, according to the predefined task schedule of each water-using unit (WU), and by maximum allowable outlet concentration of contaminants, the latter being consistent with the principle of driving force equipartition across the process. This paper focuses upon two aspects: (a) the optimization of the WN topology particular to each period, in close correlation to the storage tank behavior and (b) the dynamics of this optimized topology, as the batch process runs sequentially toward its completion. The objective is to minimize the fresh water consumption by raising the internal wastewater reuse between water-using units or from the storage tank (ST). The aforementioned optimization of the mathematical model, consisting of a system of differential algebraic equations with restrictions, is carried out using genetic algorithms, which generate the internal flows appropriate for each time window structure. A synthetic network of six WUs, three contaminants, one fresh water source, and one ST is presented and optimized under various scenarios, and the obtained results are analyzed and discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100284t [article] Dynamic water network topology optimization of batch processes [texte imprimé] / Elena-Lacramioara Dogaru, Auteur ; Vasile Lavric, Auteur . - 2011 . - pp. 3636–3652.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3636–3652
Mots-clés : Dynamic Optimization Résumé : A water network (WN) for a batch process could be seen as a dynamic structure which changes its topology at fixed time intervals delimited by events. During each time interval, the WN could be abstracted into an oriented graph, using a secondary ranking criterion, apart from schedule. The optimization strategy implies ordering the batch units twofold: by time, according to the predefined task schedule of each water-using unit (WU), and by maximum allowable outlet concentration of contaminants, the latter being consistent with the principle of driving force equipartition across the process. This paper focuses upon two aspects: (a) the optimization of the WN topology particular to each period, in close correlation to the storage tank behavior and (b) the dynamics of this optimized topology, as the batch process runs sequentially toward its completion. The objective is to minimize the fresh water consumption by raising the internal wastewater reuse between water-using units or from the storage tank (ST). The aforementioned optimization of the mathematical model, consisting of a system of differential algebraic equations with restrictions, is carried out using genetic algorithms, which generate the internal flows appropriate for each time window structure. A synthetic network of six WUs, three contaminants, one fresh water source, and one ST is presented and optimized under various scenarios, and the obtained results are analyzed and discussed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100284t Optimization of total networks of water-using and treatment units by genetic algorithms / Raluca Tudor in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010)
[article]
in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3715–3731
Titre : Optimization of total networks of water-using and treatment units by genetic algorithms Type de document : texte imprimé Auteurs : Raluca Tudor, Auteur ; Vasile Lavric, Auteur Année de publication : 2010 Article en page(s) : pp. 3715–3731 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Networks Water Treatment Genetic Algorithms Résumé : The optimization of an integrated network of water-using (WU) and treatment (TU) units is addressed in this paper, by targeting for maximum treated water reuse as a considerably better alternative to fresh water consumption. An optimal integrated water network (WN) is an oriented graph, starting with inlet contaminant free WUs and then the other WUs ranked by a certain criteria. The outlet wastewater streams are either split to be reused by the next WUs in sequence or sent to treatment. The mathematical model of the integrated WN is based upon total and contaminant species mass balances for each and every WU/TU which is restricted with respect to the inlet and outlet contaminant concentrations. The performance of the approach is tested on a synthetic example. Several scenarios were used, the results being analyzed in connection with the reduction of fresh water consumption and the increase of internal and treated water reuse. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901687z [article] Optimization of total networks of water-using and treatment units by genetic algorithms [texte imprimé] / Raluca Tudor, Auteur ; Vasile Lavric, Auteur . - 2010 . - pp. 3715–3731.
Industrial Chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3715–3731
Mots-clés : Networks Water Treatment Genetic Algorithms Résumé : The optimization of an integrated network of water-using (WU) and treatment (TU) units is addressed in this paper, by targeting for maximum treated water reuse as a considerably better alternative to fresh water consumption. An optimal integrated water network (WN) is an oriented graph, starting with inlet contaminant free WUs and then the other WUs ranked by a certain criteria. The outlet wastewater streams are either split to be reused by the next WUs in sequence or sent to treatment. The mathematical model of the integrated WN is based upon total and contaminant species mass balances for each and every WU/TU which is restricted with respect to the inlet and outlet contaminant concentrations. The performance of the approach is tested on a synthetic example. Several scenarios were used, the results being analyzed in connection with the reduction of fresh water consumption and the increase of internal and treated water reuse. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901687z Pareto Approach in Designing Optimal Semicontinuous Water Networks / Elena-Lacramioara Dogaru in Industrial & engineering chemistry research, Vol. 51 N° 17 (Mai 2012)
[article]
in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 6116–6136
Titre : Pareto Approach in Designing Optimal Semicontinuous Water Networks Type de document : texte imprimé Auteurs : Elena-Lacramioara Dogaru, Auteur ; Vasile Lavric, Auteur Année de publication : 2012 Article en page(s) : pp. 6116–6136 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Pareto optimization Semicontinuous water networks Résumé : Pareto optimization approach was used in searching for the particular successions of topologies and operating conditions for a semicontinuous water network (batch with respect to the raw materials) that minimize both the freshwater consumption and the investment and operating costs. The semicontinuous wastewater network (SWN) formed of N water-using units (WUs), each handling at most K contaminants, and one storage tank (ST) is optimized on time intervals by increasing the wastewater reuse opportunities. A single freshwater source is available and later a regeneration unit (RU) is added to the network as a fine-tuning tool in the Pareto optimization, and further its influence is discussed. The WUs are ordered simultaneously by schedule and by maximum allowable outlet concentrations of contaminants. Thus, the rules concerning the internal reuse between the overlapping WUs correspond to an oriented graph: no recycle is allowed against the ordered sequence. The differential-algebraic equations model consisting in a set of differential equations for the ST and a nonlinear system mass balance equations with restrictions for the overlapping WUs is optimized using the Matlab built in functions for both the genetic algorithms (GA) and the RK-type integrator. The topology of the SWN changes for each time interval, its optimal structure depending upon the minimum freshwater consumption and the costs. A complex synthetic case study was subjected to optimization, and several scenarios are analyzed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024728 [article] Pareto Approach in Designing Optimal Semicontinuous Water Networks [texte imprimé] / Elena-Lacramioara Dogaru, Auteur ; Vasile Lavric, Auteur . - 2012 . - pp. 6116–6136.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 17 (Mai 2012) . - pp. 6116–6136
Mots-clés : Pareto optimization Semicontinuous water networks Résumé : Pareto optimization approach was used in searching for the particular successions of topologies and operating conditions for a semicontinuous water network (batch with respect to the raw materials) that minimize both the freshwater consumption and the investment and operating costs. The semicontinuous wastewater network (SWN) formed of N water-using units (WUs), each handling at most K contaminants, and one storage tank (ST) is optimized on time intervals by increasing the wastewater reuse opportunities. A single freshwater source is available and later a regeneration unit (RU) is added to the network as a fine-tuning tool in the Pareto optimization, and further its influence is discussed. The WUs are ordered simultaneously by schedule and by maximum allowable outlet concentrations of contaminants. Thus, the rules concerning the internal reuse between the overlapping WUs correspond to an oriented graph: no recycle is allowed against the ordered sequence. The differential-algebraic equations model consisting in a set of differential equations for the ST and a nonlinear system mass balance equations with restrictions for the overlapping WUs is optimized using the Matlab built in functions for both the genetic algorithms (GA) and the RK-type integrator. The topology of the SWN changes for each time interval, its optimal structure depending upon the minimum freshwater consumption and the costs. A complex synthetic case study was subjected to optimization, and several scenarios are analyzed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2024728