Documents disponibles écrits par cet auteur

CO2 storage terminal for ship transportation / Ung Lee in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 389–397 Titre : CO2 storage terminal for ship transportation Type de document : texte imprimé Auteurs : Ung Lee, Auteur ; Youngsub Lim, Auteur ; Sangho Lee, Auteur Année de publication : 2012 Article en page(s) : pp. 389–397 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : CO2  liquefaction  process Résumé : In this article, an intermediate CO2 storage system for long-distance ship transportation was modeled. The storage terminal links the continuous CO2 liquefaction process to discrete marine ship transportation and performs as a buffer between them. It is composed of four distinct processes: a CO2 input process, a storage tank and loading process, a recirculation process, and a BOG (boiled-off gas) reliquefaction process. The entire system should be operated as a liquid phase. Consequently, operation conditions, tank capacity, insulation specification, and streamflow rates play a major role in operating the storage terminal securely. The goal of this study is to design a base case of the storage terminal and propose its appropriate operation condition which makes the terminal operate with minimum operation energy. Results of the base case simulations are compared with improperly insulated systems on the pipeline and tanks that generate more BOG than the base case. The total operation energies of the base case and case studies are presented, and it turns out that approximately three times the operation energy is required if the system is not properly designed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200762f [article] CO2 storage terminal for ship transportation [texte imprimé] / Ung Lee, Auteur ; Youngsub Lim, Auteur ; Sangho Lee, Auteur . - 2012 . - pp. 389–397. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 389–397 Mots-clés : CO2  liquefaction  process Résumé : In this article, an intermediate CO2 storage system for long-distance ship transportation was modeled. The storage terminal links the continuous CO2 liquefaction process to discrete marine ship transportation and performs as a buffer between them. It is composed of four distinct processes: a CO2 input process, a storage tank and loading process, a recirculation process, and a BOG (boiled-off gas) reliquefaction process. The entire system should be operated as a liquid phase. Consequently, operation conditions, tank capacity, insulation specification, and streamflow rates play a major role in operating the storage terminal securely. The goal of this study is to design a base case of the storage terminal and propose its appropriate operation condition which makes the terminal operate with minimum operation energy. Results of the base case simulations are compared with improperly insulated systems on the pipeline and tanks that generate more BOG than the base case. The total operation energies of the base case and case studies are presented, and it turns out that approximately three times the operation energy is required if the system is not properly designed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200762f

Methodology for stable dynamic simulation of a LNG pipe under two-phase-flow generation / Youngsub Lim in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8587–8592 Titre : Methodology for stable dynamic simulation of a LNG pipe under two-phase-flow generation Type de document : texte imprimé Auteurs : Youngsub Lim, Auteur ; Chul-Jin Lee, Auteur ; Sangho Lee, Auteur Année de publication : 2010 Article en page(s) : pp. 8587–8592 Note générale : Industrial chemistry Mots-clés : Dynamic  simulation Résumé : The results of dynamic simulations can become unstable because of a steep change in the calculated variables. In particular, when liquefied natural gas (LNG) begins to vaporize and a two-phase flow is generated, the simulation results can become violently oscillatory because of the significant volume difference between natural gas in the vapor phase and LNG in the liquid phase. To ensure more stable simulation results, we developed a methodology for replacing a unit module selectively. When LNG started to vaporize, the unit module at the point where the two-phase flow was first generated was replaced by a more stable unit module. This methodology was evaluated through a case study of a LNG pipeline model and led to more stable simulation results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902076t [article] Methodology for stable dynamic simulation of a LNG pipe under two-phase-flow generation [texte imprimé] / Youngsub Lim, Auteur ; Chul-Jin Lee, Auteur ; Sangho Lee, Auteur . - 2010 . - pp. 8587–8592. Industrial chemistry in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8587–8592 Mots-clés : Dynamic  simulation Résumé : The results of dynamic simulations can become unstable because of a steep change in the calculated variables. In particular, when liquefied natural gas (LNG) begins to vaporize and a two-phase flow is generated, the simulation results can become violently oscillatory because of the significant volume difference between natural gas in the vapor phase and LNG in the liquid phase. To ensure more stable simulation results, we developed a methodology for replacing a unit module selectively. When LNG started to vaporize, the unit module at the point where the two-phase flow was first generated was replaced by a more stable unit module. This methodology was evaluated through a case study of a LNG pipeline model and led to more stable simulation results. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902076t