Documents disponibles écrits par cet auteur

Design of nonlinear sensor networks for process plants / DuyQuang Nguyen in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5529-5542 Titre : Design of nonlinear sensor networks for process plants Type de document : texte imprimé Auteurs : DuyQuang Nguyen, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2008 Article en page(s) : p. 5529-5542 Note générale : Bibliogr. p.5541-5542 Langues : Anglais (eng) Mots-clés : Nonlinear  sensor  networks;  Nonlinear  problem Résumé : In this article we extend and generalize the ideas of two previous articles devoted to linear sensor networks to nonlinear systems. In those previous articles the use of cutsets and a decomposition procedure were proposed and proved efficient to solve large scale linear problems. In this article we show that a similar procedure, now based on a variable elimination scheme, can be also used efficiently for medium size nonlinear problems, but its computational efficiency for realistic large scale problems is not satisfactory. We also propose an alternative technique for the case of tree enumeration using instruments instead of equations that is very efficient for heavily instrumented flowsheets. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0708778 [article] Design of nonlinear sensor networks for process plants [texte imprimé] / DuyQuang Nguyen, Auteur ; Miguel J. Bagajewicz, Auteur . - 2008 . - p. 5529-5542. Bibliogr. p.5541-5542 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5529-5542 Mots-clés : Nonlinear  sensor  networks;  Nonlinear  problem Résumé : In this article we extend and generalize the ideas of two previous articles devoted to linear sensor networks to nonlinear systems. In those previous articles the use of cutsets and a decomposition procedure were proposed and proved efficient to solve large scale linear problems. In this article we show that a similar procedure, now based on a variable elimination scheme, can be also used efficiently for medium size nonlinear problems, but its computational efficiency for realistic large scale problems is not satisfactory. We also propose an alternative technique for the case of tree enumeration using instruments instead of equations that is very efficient for heavily instrumented flowsheets. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0708778

Financial risk management with product pricing in the planning of refinery operations / Hansa Lakkhanawat in Industrial & engineering chemistry research, Vol. 47 N°17 (Septembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6622–6639 Titre : Financial risk management with product pricing in the planning of refinery operations Type de document : texte imprimé Auteurs : Hansa Lakkhanawat, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2008 Article en page(s) : p. 6622–6639 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Refinery  operations  Financial  risk Résumé : In this paper, the issue of uncertainty and financial risk in refinery operations planning is addressed. The problem is determining how much of each available crude one must purchase and decide on the anticipated production level of different products, given the forecasts of overall demands. We also include, as decision variables, the price of the products. The profit is maximized by taking into account revenues, crude oil costs, inventory costs, and the cost of unsatisfied demand. Data from the refinery that is owned by Bangchak Petroleum Public Company Limited, in Bangkok, Thailand, was used for the example. The results indicate the superiority of the stochastic model, as well as the incorporation of pricing in the decision making over the use of deterministic models. Moreover, we show that, without using pricing, which introduces a price-demand relationship―a feature that normally is not present in existing models―the results that one obtains are overly optimistic, proving that pricing is an essential ingredient of planning. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710770 [article] Financial risk management with product pricing in the planning of refinery operations [texte imprimé] / Hansa Lakkhanawat, Auteur ; Miguel J. Bagajewicz, Auteur . - 2008 . - p. 6622–6639. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°17 (Septembre 2008) . - p. 6622–6639 Mots-clés : Refinery  operations  Financial  risk Résumé : In this paper, the issue of uncertainty and financial risk in refinery operations planning is addressed. The problem is determining how much of each available crude one must purchase and decide on the anticipated production level of different products, given the forecasts of overall demands. We also include, as decision variables, the price of the products. The profit is maximized by taking into account revenues, crude oil costs, inventory costs, and the cost of unsatisfied demand. Data from the refinery that is owned by Bangchak Petroleum Public Company Limited, in Bangkok, Thailand, was used for the example. The results indicate the superiority of the stochastic model, as well as the incorporation of pricing in the decision making over the use of deterministic models. Moreover, we show that, without using pricing, which introduces a price-demand relationship―a feature that normally is not present in existing models―the results that one obtains are overly optimistic, proving that pricing is an essential ingredient of planning. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710770

Global optimization of water management problems using linear relaxation and bound contraction methods / Debora C. Faria in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3738–3753 Titre : Global optimization of water management problems using linear relaxation and bound contraction methods Type de document : texte imprimé Auteurs : Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2011 Article en page(s) : pp. 3738–3753 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optimization  Water  management Résumé : In this paper, we present results of a recently developed global optimization method(1) as applied to water management problems. Our method deals effectively with MINLP problems with bilinear and univariate concave terms. Bilinear terms show up in these problems as products of flow rates and concentrations in component balances. In turn, concave terms are typically associated with equipment costs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101206c [article] Global optimization of water management problems using linear relaxation and bound contraction methods [texte imprimé] / Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur . - 2011 . - pp. 3738–3753. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3738–3753 Mots-clés : Optimization  Water  management Résumé : In this paper, we present results of a recently developed global optimization method(1) as applied to water management problems. Our method deals effectively with MINLP problems with bilinear and univariate concave terms. Bilinear terms show up in these problems as products of flow rates and concentrations in component balances. In turn, concave terms are typically associated with equipment costs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101206c

Integrated model for refinery planning, oil procuring, and product distribution / Pierre Guyonnet in Industrial & engineering chemistry research, Vol. 48 N°1 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 463-482 Titre : Integrated model for refinery planning, oil procuring, and product distribution Type de document : texte imprimé Auteurs : Pierre Guyonnet, Editeur scientifique ; F. Hank Grant, Editeur scientifique ; Miguel J. Bagajewicz, Editeur scientifique Année de publication : 2009 Article en page(s) : P. 463-482 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Refinery  production  planning  Oil  Procuring  Product  Distribution Résumé : Refinery production planning is usually performed using the refinery battery limit constraints. Two associated problems are the oil uploading and product distribution problems. These problems have traditionally been solved separately, and they have constraints that could render the solution of the planning problem infeasible or less profitable. The goal of this paper is to explore the benefits of the integration of production planning with these two models. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701712z [article] Integrated model for refinery planning, oil procuring, and product distribution [texte imprimé] / Pierre Guyonnet, Editeur scientifique ; F. Hank Grant, Editeur scientifique ; Miguel J. Bagajewicz, Editeur scientifique . - 2009 . - P. 463-482. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°1 (Janvier 2009) . - P. 463-482 Mots-clés : Refinery  production  planning  Oil  Procuring  Product  Distribution Résumé : Refinery production planning is usually performed using the refinery battery limit constraints. Two associated problems are the oil uploading and product distribution problems. These problems have traditionally been solved separately, and they have constraints that could render the solution of the planning problem infeasible or less profitable. The goal of this paper is to explore the benefits of the integration of production planning with these two models. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie701712z

On the degeneracy of the water/wastewater allocation problem in process plants / Debora C. Faria in Industrial & engineering chemistry research, Vol. 49 N° 9 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4340–4351 Titre : On the degeneracy of the water/wastewater allocation problem in process plants Type de document : texte imprimé Auteurs : Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur Année de publication : 2010 Article en page(s) : pp. 4340–4351 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Wastewater  Process  Plants Résumé : Several methodologies to design water systems in process plants are based on minimizing freshwater consumption. The objective is the appropriate one when water is scarce and costs are not a big issue. It has also been used as a substitute for cost in the belief that water and final treatment costs overwhelm other fixed capital and operating costs of regeneration processes. Among graphical and algorithmic methods, the popular “Pinch Technology”-based procedure has early proponents and contemporary advocates who consider and defend it as a good method to provide “insights” into the right answer. In this paper, we show that the minimum freshwater problem has sometimes a large number of alternative degenerate solutions, something that graphical and algorithmic procedures like the aforementioned pinch technology can hardly identify systematically. The fact that the degenerate solutions are many makes it worse. We provide a mathematical programming method to identify these solutions and to point out those that make more economical sense. We also provide means to identify suboptimal solutions that are very close to the optimum one. We illustrate these degeneracies in several cases of single and multiple contaminants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901574g [article] On the degeneracy of the water/wastewater allocation problem in process plants [texte imprimé] / Debora C. Faria, Auteur ; Miguel J. Bagajewicz, Auteur . - 2010 . - pp. 4340–4351. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 9 (Mai 2010) . - pp. 4340–4351 Mots-clés : Wastewater  Process  Plants Résumé : Several methodologies to design water systems in process plants are based on minimizing freshwater consumption. The objective is the appropriate one when water is scarce and costs are not a big issue. It has also been used as a substitute for cost in the belief that water and final treatment costs overwhelm other fixed capital and operating costs of regeneration processes. Among graphical and algorithmic methods, the popular “Pinch Technology”-based procedure has early proponents and contemporary advocates who consider and defend it as a good method to provide “insights” into the right answer. In this paper, we show that the minimum freshwater problem has sometimes a large number of alternative degenerate solutions, something that graphical and algorithmic procedures like the aforementioned pinch technology can hardly identify systematically. The fact that the degenerate solutions are many makes it worse. We provide a mathematical programming method to identify these solutions and to point out those that make more economical sense. We also provide means to identify suboptimal solutions that are very close to the optimum one. We illustrate these degeneracies in several cases of single and multiple contaminants. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901574g

Planning model for the design and/or retrofit of industrial water systems / Debora C. Faria in Industrial & engineering chemistry research, Vol. 50 N° 7 (Avril 2011) 

Permalink

Software accuracy-based sensor network design and upgrade in process plants / DuyQuang Nguyen in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Permalink