Integration design of heat exchanger networks into membrane distillation systems to save energy / Yanyue Lu in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6798-6810 Titre : Integration design of heat exchanger networks into membrane distillation systems to save energy Type de document : texte imprimé Auteurs : Yanyue Lu, Auteur ; Junghui Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 6798-6810 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Membrane separation distillation Heat exchanger Meshed network Design Résumé : Membrane distillation requires a lower operation temperature than other separation processes. It is also able to use low-grade thermal energy. In this study, an integrated design method that utilizes a membrane distillation (MD) system to produce pure water is presented. This method is the integration of the heat exchanger network (HEN) into the MD system, and it uses the waste heat from HEN as the energy source of the MD process so as to greatly reduce the water cost. In this proposed method, a multistage MD system is designed to generate the optimal system structure and operating conditions. Then the output and input MD streams are merged into the existing HEN so that the energy cost of pure water can be determined by redesigning the HEN with the trans-shipment models. The efficiency of the proposed method is demonstrated through an industrial case. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900234 [article] Integration design of heat exchanger networks into membrane distillation systems to save energy [texte imprimé] / Yanyue Lu, Auteur ; Junghui Chen, Auteur . - 2012 . - pp. 6798-6810. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6798-6810 Mots-clés : Membrane separation distillation Heat exchanger Meshed network Design Résumé : Membrane distillation requires a lower operation temperature than other separation processes. It is also able to use low-grade thermal energy. In this study, an integrated design method that utilizes a membrane distillation (MD) system to produce pure water is presented. This method is the integration of the heat exchanger network (HEN) into the MD system, and it uses the waste heat from HEN as the energy source of the MD process so as to greatly reduce the water cost. In this proposed method, a multistage MD system is designed to generate the optimal system structure and operating conditions. Then the output and input MD streams are merged into the existing HEN so that the energy cost of pure water can be determined by redesigning the HEN with the trans-shipment models. The efficiency of the proposed method is demonstrated through an industrial case. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900234

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Optimal design of multistage membrane distillation systems for water purification / Yanyue Lu in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7345-7354 Titre : Optimal design of multistage membrane distillation systems for water purification Type de document : texte imprimé Auteurs : Yanyue Lu, Auteur ; Junghui Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 7345-7354 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Membrane separation Purification distillation Optimal design Résumé : In this paper, a novel optimal design strategy is proposed to produce pure water in a multistage membrane distillation (MD) system. It is a systematic approach to modeling and analyzing multistage MD processes. The proposed method can generate the optimal system structure and operation conditions and avoid poor integration and suboptimal configuration of multistage MD systems. In this approach, an innovative module model is first established, and then the cost function relating the capital and the operation cost to the design variables and the structural variables of the designed system is introduced in the objective function. A superstructure flow sheet is presented to describe all the possible flow routes for the cold stream. Then optimal design problem can be formulated as a mixed-integer nonlinear programming (MINLP) problem to minimize the total annualized cost. Based on our simulation studies, the mode of the commonly used countercurrent operation is the optimal flow route for the MD system. The design results would also determine the configuration of the optimal separation stage, the optimal operating mode, and the corresponding operating conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239050 [article] Optimal design of multistage membrane distillation systems for water purification [texte imprimé] / Yanyue Lu, Auteur ; Junghui Chen, Auteur . - 2011 . - pp. 7345-7354. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7345-7354 Mots-clés : Membrane separation Purification distillation Optimal design Résumé : In this paper, a novel optimal design strategy is proposed to produce pure water in a multistage membrane distillation (MD) system. It is a systematic approach to modeling and analyzing multistage MD processes. The proposed method can generate the optimal system structure and operation conditions and avoid poor integration and suboptimal configuration of multistage MD systems. In this approach, an innovative module model is first established, and then the cost function relating the capital and the operation cost to the design variables and the structural variables of the designed system is introduced in the objective function. A superstructure flow sheet is presented to describe all the possible flow routes for the cold stream. Then optimal design problem can be formulated as a mixed-integer nonlinear programming (MINLP) problem to minimize the total annualized cost. Based on our simulation studies, the mode of the commonly used countercurrent operation is the optimal flow route for the MD system. The design results would also determine the configuration of the optimal separation stage, the optimal operating mode, and the corresponding operating conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239050

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