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Heat integration by multiple hot discharges/feeds between plants / B. J. Zhang in Industrial & engineering chemistry research, Vol. 50 N° 18 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10744-10754 Titre : Heat integration by multiple hot discharges/feeds between plants Type de document : texte imprimé Auteurs : B. J. Zhang, Auteur ; X. L. Luo, Auteur ; Q. L. Chen, Auteur Année de publication : 2011 Article en page(s) : pp. 10744-10754 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heat  recovery Résumé : Some independent plants making up a chemical or petrochemical site are linked by process streams. Linking process streams are, in general, cooled in up-plants and reheated in down-plants to satisfy process requirements. These streams, even more, travel from up-plants to storage tanks and, then, to down-plants, which results in low energy-use efficiency. Up-plants with multiple hot discharges and down-plants with multiple hot feeds are proposed in this paper, and a T―Qgraphic method is presented to target the temperature of multiple hot discharges/feeds between plants. The T-Q diagram is composed of a grand composite curve (GCC) and a composite curve that only involves process streams employed for hot discharge/feed. A mixed integer linear programming (MILP) model is formulated to minimize the total hot and cold utilities of up- and down-plants and to solve the temperature of hot discharge/feed and the heat transfer between plants. Some examples are utilized to demonstrate the performance of the presented method for multiple hot discharges/feeds between plants. Results show an obvious decrease in the total hot and cold utilities of up- and down-plants, along with less investment for equipment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523891 [article] Heat integration by multiple hot discharges/feeds between plants [texte imprimé] / B. J. Zhang, Auteur ; X. L. Luo, Auteur ; Q. L. Chen, Auteur . - 2011 . - pp. 10744-10754. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 18 (Septembre 2011) . - pp. 10744-10754 Mots-clés : Heat  recovery Résumé : Some independent plants making up a chemical or petrochemical site are linked by process streams. Linking process streams are, in general, cooled in up-plants and reheated in down-plants to satisfy process requirements. These streams, even more, travel from up-plants to storage tanks and, then, to down-plants, which results in low energy-use efficiency. Up-plants with multiple hot discharges and down-plants with multiple hot feeds are proposed in this paper, and a T―Qgraphic method is presented to target the temperature of multiple hot discharges/feeds between plants. The T-Q diagram is composed of a grand composite curve (GCC) and a composite curve that only involves process streams employed for hot discharge/feed. A mixed integer linear programming (MILP) model is formulated to minimize the total hot and cold utilities of up- and down-plants and to solve the temperature of hot discharge/feed and the heat transfer between plants. Some examples are utilized to demonstrate the performance of the presented method for multiple hot discharges/feeds between plants. Results show an obvious decrease in the total hot and cold utilities of up- and down-plants, along with less investment for equipment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24523891

Hot discharges/feeds between plants to combine utility streams for heat integration / B. J. Zhang in Industrial & engineering chemistry research, Vol. 51 N° 44 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14461–14472 Titre : Hot discharges/feeds between plants to combine utility streams for heat integration Type de document : texte imprimé Auteurs : B. J. Zhang, Auteur ; X. L. Luo, Auteur ; Q. L. Chen, Auteur Année de publication : 2013 Article en page(s) : pp. 14461–14472 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Heat  integration Résumé : A sharp increase in worldwide energy requirements has forced people to exploit novel energy conservation technologies and new alternative energies. Heat integration, as a method of saving energy, is proposed in this paper in the form of integrating multiple hot discharges/feeds between plants and utility streams to reduce utility requirements and increase steam production for the total site. T–Q graphic methods are proposed to coordinate the temperatures of multiple hot discharges/feeds between plants and the steam production. The grand composite curve (GCC), the composite curve of the streams employed for hot discharges/feeds, and the curve of steam generation are combined into the T–Q diagram to obtain an insight into the interrelationship between these streams. A bilevel mixed integer linear programming (MILP) framework is presented to minimize the total hot and cold utilities of the up and down plants and to maximize the steam generation in the total site. The first level of the programming framework is formulated to target the utility requirements, and the second level of the programming framework is formulated to maximize the steam production. Two examples are investigated to demonstrate the performance of the proposed method, and the results show a decrease in the total hot and cold utilities of the up and down plants and also indicate an increase in steam production. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301631c [article] Hot discharges/feeds between plants to combine utility streams for heat integration [texte imprimé] / B. J. Zhang, Auteur ; X. L. Luo, Auteur ; Q. L. Chen, Auteur . - 2013 . - pp. 14461–14472. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 44 (Novembre 2012) . - pp. 14461–14472 Mots-clés : Heat  integration Résumé : A sharp increase in worldwide energy requirements has forced people to exploit novel energy conservation technologies and new alternative energies. Heat integration, as a method of saving energy, is proposed in this paper in the form of integrating multiple hot discharges/feeds between plants and utility streams to reduce utility requirements and increase steam production for the total site. T–Q graphic methods are proposed to coordinate the temperatures of multiple hot discharges/feeds between plants and the steam production. The grand composite curve (GCC), the composite curve of the streams employed for hot discharges/feeds, and the curve of steam generation are combined into the T–Q diagram to obtain an insight into the interrelationship between these streams. A bilevel mixed integer linear programming (MILP) framework is presented to minimize the total hot and cold utilities of the up and down plants and to maximize the steam generation in the total site. The first level of the programming framework is formulated to target the utility requirements, and the second level of the programming framework is formulated to maximize the steam production. Two examples are investigated to demonstrate the performance of the proposed method, and the results show a decrease in the total hot and cold utilities of the up and down plants and also indicate an increase in steam production. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301631c