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

Design and economic analysis of the process for biodiesel fuel production from transesterificated rapeseed oil using supercritical methanol / Youngsub Lim in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5370–5378 Titre : Design and economic analysis of the process for biodiesel fuel production from transesterificated rapeseed oil using supercritical methanol Type de document : texte imprimé Auteurs : Youngsub Lim, Auteur ; Hong-shik Lee, Auteur ; Youn Woo Lee, Auteur Année de publication : 2009 Article en page(s) : pp. 5370–5378 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Biodiesel  fuel  production  Alkali-catalyzed  process  Supercritical  biodiesel  process Résumé : A supercritical process for biodiesel fuel production is generally known to be less profitable than the alkali-catalyzed process due to high temperature and pressure requirements for the supercritical reaction. Only a few approaches have been proposed using experimental results to design a supercritical biodiesel process and to assess its profitability compared to the alkali-catalyzed process. In this study, a design for a supercritical biodiesel process was suggested and its economic performance with three different reaction conditions was simulated in the comparison with the conventional alkali-catalyzed process. It was found that the total capital cost was higher in all three cases of the supercritical process than in the alkali-catalyzed process due to the high cost of pumps, heaters, and heat exchangers. However, the total manufacturing cost of the supercritical process was lower than that of the alkali-catalyzed process due to the higher glycerol credit and the lack of a requirement for catalyst or solvent. The supercritical process can produce high-purity glycerol more easily that does not contain any water, which is unavoidable in the washing step of the alkali-catalyzed process. The higher steam cost in the supercritical process was compensated for by catalyst and solvent costs in the alkali-catalyzed process. Overall, one of the supercritical processes resulted in shorter payout time than the alkali-catalyzed process even when virgin oil was used as one of the raw materials, because the lower total manufacturing cost made up for the increased total capital cost. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005287 [article] Design and economic analysis of the process for biodiesel fuel production from transesterificated rapeseed oil using supercritical methanol [texte imprimé] / Youngsub Lim, Auteur ; Hong-shik Lee, Auteur ; Youn Woo Lee, Auteur . - 2009 . - pp. 5370–5378. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5370–5378 Mots-clés : Biodiesel  fuel  production  Alkali-catalyzed  process  Supercritical  biodiesel  process Résumé : A supercritical process for biodiesel fuel production is generally known to be less profitable than the alkali-catalyzed process due to high temperature and pressure requirements for the supercritical reaction. Only a few approaches have been proposed using experimental results to design a supercritical biodiesel process and to assess its profitability compared to the alkali-catalyzed process. In this study, a design for a supercritical biodiesel process was suggested and its economic performance with three different reaction conditions was simulated in the comparison with the conventional alkali-catalyzed process. It was found that the total capital cost was higher in all three cases of the supercritical process than in the alkali-catalyzed process due to the high cost of pumps, heaters, and heat exchangers. However, the total manufacturing cost of the supercritical process was lower than that of the alkali-catalyzed process due to the higher glycerol credit and the lack of a requirement for catalyst or solvent. The supercritical process can produce high-purity glycerol more easily that does not contain any water, which is unavoidable in the washing step of the alkali-catalyzed process. The higher steam cost in the supercritical process was compensated for by catalyst and solvent costs in the alkali-catalyzed process. Overall, one of the supercritical processes resulted in shorter payout time than the alkali-catalyzed process even when virgin oil was used as one of the raw materials, because the lower total manufacturing cost made up for the increased total capital cost. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005287

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

Optimal design and decision for combined steam reforming process with dry methane reforming to reuse CO2 as a raw material / Youngsub Lim in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4982-4989 Titre : Optimal design and decision for combined steam reforming process with dry methane reforming to reuse CO2 as a raw material Type de document : texte imprimé Auteurs : Youngsub Lim, Auteur ; Chul-Jin Lee, Auteur ; Yeong Su Jeong, Auteur Année de publication : 2012 Article en page(s) : pp. 4982-4989 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Raw  materials  Carbon  dioxide  Reuse  Steam  reforming  Optimal  design Résumé : Carbon dioxide (CO2) conversion technology has been estimated as a potentially practical solution for global warming problems although it still has some weaknesses such as cost and energy consumption. In this study, a combined steam reforming process with dry methane reforming process for the CO2 treatment was investigated. Because the dry methane reforming process could generate synthesis gas from carbon dioxide, it could decrease the CO2 emissions from the existing steam reforming process. Models for the steam reforming process and the combined process were developed and extended mitigation cost was suggested to evaluate CO2 reduction of the overall process. The combined process could reduce net CO2 emission by 67% compared with the reference steam reforming process, and the extended mitigation cost of the combined process ranged from 21 to 26.5 (US$/CO2 ton) according to the change of the cost for CO2 transportation. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25777937 [article] Optimal design and decision for combined steam reforming process with dry methane reforming to reuse CO2 as a raw material [texte imprimé] / Youngsub Lim, Auteur ; Chul-Jin Lee, Auteur ; Yeong Su Jeong, Auteur . - 2012 . - pp. 4982-4989. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 4982-4989 Mots-clés : Raw  materials  Carbon  dioxide  Reuse  Steam  reforming  Optimal  design Résumé : Carbon dioxide (CO2) conversion technology has been estimated as a potentially practical solution for global warming problems although it still has some weaknesses such as cost and energy consumption. In this study, a combined steam reforming process with dry methane reforming process for the CO2 treatment was investigated. Because the dry methane reforming process could generate synthesis gas from carbon dioxide, it could decrease the CO2 emissions from the existing steam reforming process. Models for the steam reforming process and the combined process were developed and extended mitigation cost was suggested to evaluate CO2 reduction of the overall process. The combined process could reduce net CO2 emission by 67% compared with the reference steam reforming process, and the extended mitigation cost of the combined process ranged from 21 to 26.5 (US$/CO2 ton) according to the change of the cost for CO2 transportation. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25777937

Optimal gas-to-liquid product selection from natural gas under uncertain price scenarios / Chul-Jin Lee in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 794–800 Titre : Optimal gas-to-liquid product selection from natural gas under uncertain price scenarios Type de document : texte imprimé Auteurs : Chul-Jin Lee, Auteur ; Youngsub Lim, Auteur ; Ho Soo Kim, Auteur ; Chonghun Han, Auteur Année de publication : 2009 Article en page(s) : p. 794–800 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Optimal  Gas Résumé : Gas-to-liquid (GTL) products have come into the spotlight for alternative energy carriers as an environmentally benign and highly profitable alternative to petroleum resources. There have been various studies conducted to explore the economic and environmental benefits of individual GTL products, but few researchers have performed a comparative economic assessment, determining which product would make the greatest profit among various GTL products. Furthermore, considering the inherent characteristics of process industries, profits from one product are deeply dependent on the price of its raw material. Thus, it is important to choose an optimal GTL product covering those price variations. In this study, we performed economic analyses for three GTL products used for transportation fuel through process modeling and investigated the profitability according to variations in feedstock cost and product price. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800879y [article] Optimal gas-to-liquid product selection from natural gas under uncertain price scenarios [texte imprimé] / Chul-Jin Lee, Auteur ; Youngsub Lim, Auteur ; Ho Soo Kim, Auteur ; Chonghun Han, Auteur . - 2009 . - p. 794–800. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 794–800 Mots-clés : Optimal  Gas Résumé : Gas-to-liquid (GTL) products have come into the spotlight for alternative energy carriers as an environmentally benign and highly profitable alternative to petroleum resources. There have been various studies conducted to explore the economic and environmental benefits of individual GTL products, but few researchers have performed a comparative economic assessment, determining which product would make the greatest profit among various GTL products. Furthermore, considering the inherent characteristics of process industries, profits from one product are deeply dependent on the price of its raw material. Thus, it is important to choose an optimal GTL product covering those price variations. In this study, we performed economic analyses for three GTL products used for transportation fuel through process modeling and investigated the profitability according to variations in feedstock cost and product price. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800879y

Synthesis of unloading operation procedure for a mixed operation of above-ground and in-ground liquefied natural gas storage tanks using dynamic simulation / Chul-Jin Lee in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

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