Documents disponibles écrits par cet auteur

Evaluation of design performance of the semi-closed oxy-fuel combustion combined cycle / H. J. Yang in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 134 N° 11 (Novembre 2012) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 134 N° 11 (Novembre 2012) . - 10 p. Titre : Evaluation of design performance of the semi-closed oxy-fuel combustion combined cycle Type de document : texte imprimé Auteurs : H. J. Yang, Auteur ; D. W. Kang, Auteur ; J. H. Ahn, Auteur Année de publication : 2012 Article en page(s) : 10 p. Note générale : gas turbines Langues : Anglais (eng) Mots-clés : natural  gas;  semi-closed  oxy-fuel  combustion  combined  cycle  (SCOC-CC) Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This study aims to present various design aspects and realizable performance of the natural gas fired semi-closed oxy-fuel combustion combined cycle (SCOC-CC). The design parameters of the cycle are set up on the basis of the component technologies of today's state-of-the-art gas turbines with a turbine inlet temperature between 1400 °C and 1600 °C. The most important part of the cycle analysis is the turbine cooling, which considerably affects the cycle performance. A thermodynamic cooling model is introduced in order to predict the reasonable amount of turbine coolant needed to maintain the turbine blade temperature of the SCOC-CC at the levels of those of conventional gas turbines. The optimal pressure ratio ranges of the SCOC-CC for two different turbine inlet temperature levels are researched. The performance penalty due to the CO2 capture is examined. The influences of the purity of the oxygen provided by the air separation unit on the cycle performance are also investigated. A comparison with the conventional combined cycle, adopting a postcombustion CO2 capture, is carried out, taking into account the relationship between the performance and the CO2 capture rate. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000134000011 [...] [article] Evaluation of design performance of the semi-closed oxy-fuel combustion combined cycle [texte imprimé] / H. J. Yang, Auteur ; D. W. Kang, Auteur ; J. H. Ahn, Auteur . - 2012 . - 10 p. gas turbines Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 134 N° 11 (Novembre 2012) . - 10 p. Mots-clés : natural  gas;  semi-closed  oxy-fuel  combustion  combined  cycle  (SCOC-CC) Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This study aims to present various design aspects and realizable performance of the natural gas fired semi-closed oxy-fuel combustion combined cycle (SCOC-CC). The design parameters of the cycle are set up on the basis of the component technologies of today's state-of-the-art gas turbines with a turbine inlet temperature between 1400 °C and 1600 °C. The most important part of the cycle analysis is the turbine cooling, which considerably affects the cycle performance. A thermodynamic cooling model is introduced in order to predict the reasonable amount of turbine coolant needed to maintain the turbine blade temperature of the SCOC-CC at the levels of those of conventional gas turbines. The optimal pressure ratio ranges of the SCOC-CC for two different turbine inlet temperature levels are researched. The performance penalty due to the CO2 capture is examined. The influences of the purity of the oxygen provided by the air separation unit on the cycle performance are also investigated. A comparison with the conventional combined cycle, adopting a postcombustion CO2 capture, is carried out, taking into account the relationship between the performance and the CO2 capture rate. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000134000011 [...]

Novel polycarboxylated starch-Bbased sorbents for Cu2+ ions / Kalpana Chauhan in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2548–2556 Titre : Novel polycarboxylated starch-Bbased sorbents for Cu2+ ions Type de document : texte imprimé Auteurs : Kalpana Chauhan, Auteur ; Ghanshyam S. Chauhan, Auteur ; J. H. Ahn, Auteur Année de publication : 2010 Article en page(s) : pp. 2548–2556 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Sorbents  Polycarboxylated  Starch  Cu2+  Ions Résumé : In this article we report use of novel starch-based functional hydrogels as Cu2+ ions sorbents. Starch was functionalized by acid hydrolysis and/or oxidized by nitrogen oxides to generate carboxylic groups at C-6. Sorption of Cu2+ ions was studied as a function of hydrogel structure and environmental factors. Hydrogels exhibit structure−property relationship in the sorption of Cu2+ ions. The hydrogel that exhibited the maximum ion uptake was used to investigate the effect of contact time, temperature, pH, and Cu2+ ions concentration on the sorption capacity. The maximum sorption capacity of 128.26 mg g−1 was obtained in 2 h at 40 °C, 7.0 pH, and 50 ppm of Cu2+ ions. Sorption data show good match both with Langmuir and Freundlich isotherms and obey pseudo-second-order kinetics. Cu2+ ions bind to sorbents by chelation. Evidence of Cu2+ uptake on hydrogels was obtained from FTIR spectrum of the ions-loaded hydrogel. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009952 [article] Novel polycarboxylated starch-Bbased sorbents for Cu2+ ions [texte imprimé] / Kalpana Chauhan, Auteur ; Ghanshyam S. Chauhan, Auteur ; J. H. Ahn, Auteur . - 2010 . - pp. 2548–2556. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2548–2556 Mots-clés : Sorbents  Polycarboxylated  Starch  Cu2+  Ions Résumé : In this article we report use of novel starch-based functional hydrogels as Cu2+ ions sorbents. Starch was functionalized by acid hydrolysis and/or oxidized by nitrogen oxides to generate carboxylic groups at C-6. Sorption of Cu2+ ions was studied as a function of hydrogel structure and environmental factors. Hydrogels exhibit structure−property relationship in the sorption of Cu2+ ions. The hydrogel that exhibited the maximum ion uptake was used to investigate the effect of contact time, temperature, pH, and Cu2+ ions concentration on the sorption capacity. The maximum sorption capacity of 128.26 mg g−1 was obtained in 2 h at 40 °C, 7.0 pH, and 50 ppm of Cu2+ ions. Sorption data show good match both with Langmuir and Freundlich isotherms and obey pseudo-second-order kinetics. Cu2+ ions bind to sorbents by chelation. Evidence of Cu2+ uptake on hydrogels was obtained from FTIR spectrum of the ions-loaded hydrogel. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9009952