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Graphical analysis of process changes for water minimization / Xiao Feng in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7145–7151 Titre : Graphical analysis of process changes for water minimization Type de document : texte imprimé Auteurs : Xiao Feng, Auteur ; Yang Liu, Auteur ; Long Huang, Auteur Année de publication : 2009 Article en page(s) : pp. 7145–7151 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Water-using  process  Freshwater  consumption  Wastewater  generation  Inlet/outlet  concentrations Résumé : The effective changes in a water-using process can reduce freshwater consumption and wastewater generation. The main effects of process changes include the increment of limiting inlet/outlet concentrations of water-using processes and the reduction of the contaminant load of those processes. Because the water pinch of a water system is the bottleneck to limit the freshwater consumption, in this paper a water pinch diagram is used to explore the impact of process changes on the pinch point. Process changes which can move the pinch point upward and/or leftward can reduce freshwater consumption in the system. To further save freshwater in a water system, a process change which can increase limiting concentrations should be executed to an across-pinch process, and a process change which can reduce contaminant load should be executed below the pinch. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900094m [article] Graphical analysis of process changes for water minimization [texte imprimé] / Xiao Feng, Auteur ; Yang Liu, Auteur ; Long Huang, Auteur . - 2009 . - pp. 7145–7151. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7145–7151 Mots-clés : Water-using  process  Freshwater  consumption  Wastewater  generation  Inlet/outlet  concentrations Résumé : The effective changes in a water-using process can reduce freshwater consumption and wastewater generation. The main effects of process changes include the increment of limiting inlet/outlet concentrations of water-using processes and the reduction of the contaminant load of those processes. Because the water pinch of a water system is the bottleneck to limit the freshwater consumption, in this paper a water pinch diagram is used to explore the impact of process changes on the pinch point. Process changes which can move the pinch point upward and/or leftward can reduce freshwater consumption in the system. To further save freshwater in a water system, a process change which can increase limiting concentrations should be executed to an across-pinch process, and a process change which can reduce contaminant load should be executed below the pinch. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900094m

Targeting for conventional and property-based water network with multiple resources / Chun Deng 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. 3722–3737 Titre : Targeting for conventional and property-based water network with multiple resources Type de document : texte imprimé Auteurs : Chun Deng, Auteur ; Xiao Feng, Auteur Année de publication : 2011 Article en page(s) : pp. 3722–3737 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Water  network Résumé : Water scarcity and stringent emission legislation have been motivating process industries to emphasize water conservation. Pinch analysis has been accepted as one of the powerful approaches to locate targets of wastewater minimization. In this paper, the improve problem table (IPT) is presented to target conventional and property-based water networks with multiple resources on the basis of the composite table algorithm (CTA) (Agrawal, V.; Shenoy, U. V. Unified conceptual approach to targeting and design of water and hydrogen networks. AIChE J.2006, 52, 1071−1082). The corresponding limiting composite curve and water supply line are plotted to facilitate the analyzing and understanding of basic physical insights. The minimum operating cost subject to availability of the water resources is also addressed. In addition, two strategies are proposed to handle flow rate constraints for certain resources, and the corresponding wastewater stream identification techniques are introduced successively. To illustrate the applicability of IPT, two conventional so-called concentration-based water networks with different scenarios, i.e., direct reuse/recycle and regeneration reuse/recycle, are synthesized. Moreover, the targets for a property-based water network with a pretreatment system are determined via the proposed IPT. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012008 [article] Targeting for conventional and property-based water network with multiple resources [texte imprimé] / Chun Deng, Auteur ; Xiao Feng, Auteur . - 2011 . - pp. 3722–3737. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3722–3737 Mots-clés : Water  network Résumé : Water scarcity and stringent emission legislation have been motivating process industries to emphasize water conservation. Pinch analysis has been accepted as one of the powerful approaches to locate targets of wastewater minimization. In this paper, the improve problem table (IPT) is presented to target conventional and property-based water networks with multiple resources on the basis of the composite table algorithm (CTA) (Agrawal, V.; Shenoy, U. V. Unified conceptual approach to targeting and design of water and hydrogen networks. AIChE J.2006, 52, 1071−1082). The corresponding limiting composite curve and water supply line are plotted to facilitate the analyzing and understanding of basic physical insights. The minimum operating cost subject to availability of the water resources is also addressed. In addition, two strategies are proposed to handle flow rate constraints for certain resources, and the corresponding wastewater stream identification techniques are introduced successively. To illustrate the applicability of IPT, two conventional so-called concentration-based water networks with different scenarios, i.e., direct reuse/recycle and regeneration reuse/recycle, are synthesized. Moreover, the targets for a property-based water network with a pretreatment system are determined via the proposed IPT. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1012008

Water allocation network design concerning process disturbance / Xiao Feng 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. 3675–3685 Titre : Water allocation network design concerning process disturbance Type de document : texte imprimé Auteurs : Xiao Feng, Auteur ; Renjie Shen, Auteur ; Xuesong Zheng, Auteur Année de publication : 2011 Article en page(s) : pp. 3675–3685 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Water  allocation  network Résumé : Water system integration can effectively reduce freshwater consumption and minimize wastewater discharge of a water-using system, but integration makes the resultant water network structurally more integrated among process units. Therefore, to design a flexible water allocation network that is easy to control becomes highly desirable. In this Article, a methodology is presented for water allocation network design with process disturbance taken into account. For a new design, the synthesized network structure can guarantee that the water system consumes minimum freshwater under both normal and disturbance conditions and with minimum number of control streams under disturbance. At the same time, the information needed to adjust flow rate under disturbance will be obtained. For an existing water system, an adjustment scheme under disturbance with minimum freshwater consumption for the existing structure will be obtained. The water network designed by the new methodology has the feature of minimum freshwater consumption and high flexibility under disturbance. Some case studies are used to demonstrate the method. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100847s [article] Water allocation network design concerning process disturbance [texte imprimé] / Xiao Feng, Auteur ; Renjie Shen, Auteur ; Xuesong Zheng, Auteur . - 2011 . - pp. 3675–3685. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 7 (Avril 2011) . - pp. 3675–3685 Mots-clés : Water  allocation  network Résumé : Water system integration can effectively reduce freshwater consumption and minimize wastewater discharge of a water-using system, but integration makes the resultant water network structurally more integrated among process units. Therefore, to design a flexible water allocation network that is easy to control becomes highly desirable. In this Article, a methodology is presented for water allocation network design with process disturbance taken into account. For a new design, the synthesized network structure can guarantee that the water system consumes minimum freshwater under both normal and disturbance conditions and with minimum number of control streams under disturbance. At the same time, the information needed to adjust flow rate under disturbance will be obtained. For an existing water system, an adjustment scheme under disturbance with minimum freshwater consumption for the existing structure will be obtained. The water network designed by the new methodology has the feature of minimum freshwater consumption and high flexibility under disturbance. Some case studies are used to demonstrate the method. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100847s