Documents disponibles écrits par cet auteur

Optimizing the initial conditions to improve the dynamic flexibility of batch processes / Hua Zhou in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6321–6326 Titre : Optimizing the initial conditions to improve the dynamic flexibility of batch processes Type de document : texte imprimé Auteurs : Hua Zhou, Auteur ; Xiuxi Li, Auteur ; Yu Qian, Auteur Année de publication : 2009 Article en page(s) : pp. 6321–6326 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Initial  operation  conditions  Batch  processes  Dynamic  flexibility  analysis Résumé : It is shown in this paper that by changing the initial operation condition of batch processes, the dynamic performance of the system can be varied largely. The initial operation conditions are often ignored in design of batch processes for flexibility against disturbances or parameter variations. When the initial conditions are not rigid, as in the case of a batch reactor where the initial reaction temperature is quite arbitrary, optimization can also be applied to determine the “best” initial condition to be used. Problems for dynamic flexibility analysis, including initial conditions and process operation, can be formulated as dynamic optimization problems. If the initial conditions are considered, the conditions can be transferred into control variables in the first step of optimization. The solution of the dynamic optimization is based on the Runge-Kutta integration algorithm and decomposition search algorithm. This method, as illustrated and tested with two highly nonlinear chemical engineering problems, enables the optimal solution to be determined. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006424 [article] Optimizing the initial conditions to improve the dynamic flexibility of batch processes [texte imprimé] / Hua Zhou, Auteur ; Xiuxi Li, Auteur ; Yu Qian, Auteur . - 2009 . - pp. 6321–6326. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6321–6326 Mots-clés : Initial  operation  conditions  Batch  processes  Dynamic  flexibility  analysis Résumé : It is shown in this paper that by changing the initial operation condition of batch processes, the dynamic performance of the system can be varied largely. The initial operation conditions are often ignored in design of batch processes for flexibility against disturbances or parameter variations. When the initial conditions are not rigid, as in the case of a batch reactor where the initial reaction temperature is quite arbitrary, optimization can also be applied to determine the “best” initial condition to be used. Problems for dynamic flexibility analysis, including initial conditions and process operation, can be formulated as dynamic optimization problems. If the initial conditions are considered, the conditions can be transferred into control variables in the first step of optimization. The solution of the dynamic optimization is based on the Runge-Kutta integration algorithm and decomposition search algorithm. This method, as illustrated and tested with two highly nonlinear chemical engineering problems, enables the optimal solution to be determined. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8006424

Process configurations and simulations for a novel single-column cryogenic air separation process / Hua Zhou in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15431-15439 Titre : Process configurations and simulations for a novel single-column cryogenic air separation process Type de document : texte imprimé Auteurs : Hua Zhou, Auteur ; Yunan Cai, Auteur ; Yao Xiao, Auteur Année de publication : 2013 Article en page(s) : pp. 15431-15439 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Separation  process  Cryogenics Résumé : In this article, a novel single-column atmospheric cryogenic air separation process is proposed to reduce energy consumption through the implementation of thermal pump technique. Different from the conventional double-column cryogenic process, the new single-column distillation includes a nitrogen compressor acting as a thermal pump, which makes use of the latent thermal energy of the streams in the distillation column. To verify the validity of the proposed separation process, four typical configurations of the single-column processes are constructed and simulated on the ASPEN PLUS platform with the operation conditions: air flow rate at 50000 N m3, inlet temperature of the distillation column at 87 K, and various nitrogen compression temperatures. The conventional double-column cryogenic air separation process is also simulated as the base to compare the energy consumptions between the conventional and the novel processes. On the basis of such a comparison, the novel single-column cryogenic air separation process can save energy up to 23% and produce the products' purity in industrial standard. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679663 [article] Process configurations and simulations for a novel single-column cryogenic air separation process [texte imprimé] / Hua Zhou, Auteur ; Yunan Cai, Auteur ; Yao Xiao, Auteur . - 2013 . - pp. 15431-15439. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15431-15439 Mots-clés : Separation  process  Cryogenics Résumé : In this article, a novel single-column atmospheric cryogenic air separation process is proposed to reduce energy consumption through the implementation of thermal pump technique. Different from the conventional double-column cryogenic process, the new single-column distillation includes a nitrogen compressor acting as a thermal pump, which makes use of the latent thermal energy of the streams in the distillation column. To verify the validity of the proposed separation process, four typical configurations of the single-column processes are constructed and simulated on the ASPEN PLUS platform with the operation conditions: air flow rate at 50000 N m3, inlet temperature of the distillation column at 87 K, and various nitrogen compression temperatures. The conventional double-column cryogenic air separation process is also simulated as the base to compare the energy consumptions between the conventional and the novel processes. On the basis of such a comparison, the novel single-column cryogenic air separation process can save energy up to 23% and produce the products' purity in industrial standard. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679663