Documents disponibles écrits par cet auteur

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) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8219–8226 Titre : Synthesis of unloading operation procedure for a mixed operation of above-ground and in-ground liquefied natural gas storage tanks using dynamic simulation Type de document : texte imprimé Auteurs : Chul-Jin Lee, Auteur ; Youngsub Lim, Auteur ; Chansaem Park, Auteur Année de publication : 2010 Article en page(s) : pp 8219–8226 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Liquefied  natural  gas  Dynamic  simulation. Résumé : Because of increased liquefied natural gas (LNG) demand, operation of LNG receiving terminals having both above-ground and in-ground LNG storage tanks will soon be required. In such cases, there exists a pressure head difference between the two types of tanks. As such, during the depressurization step of LNG unloading, vapor can be generated at the top of the unloading pipeline of the above-ground tank due to pressure head. Vapor produced in a branch pipeline of the above-ground tank can thereby cause congestion during depressurization, resulting in a pressure difference across the unloading valve. This can, in turn, cause excessive boil off gas inflow into the storage tank. In this paper, we suggest a reliable unloading operation procedure for a mixed operation of above-ground and in-ground storage tanks using dynamic simulation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902075k [article] Synthesis of unloading operation procedure for a mixed operation of above-ground and in-ground liquefied natural gas storage tanks using dynamic simulation [texte imprimé] / Chul-Jin Lee, Auteur ; Youngsub Lim, Auteur ; Chansaem Park, Auteur . - 2010 . - pp 8219–8226. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8219–8226 Mots-clés : Liquefied  natural  gas  Dynamic  simulation. Résumé : Because of increased liquefied natural gas (LNG) demand, operation of LNG receiving terminals having both above-ground and in-ground LNG storage tanks will soon be required. In such cases, there exists a pressure head difference between the two types of tanks. As such, during the depressurization step of LNG unloading, vapor can be generated at the top of the unloading pipeline of the above-ground tank due to pressure head. Vapor produced in a branch pipeline of the above-ground tank can thereby cause congestion during depressurization, resulting in a pressure difference across the unloading valve. This can, in turn, cause excessive boil off gas inflow into the storage tank. In this paper, we suggest a reliable unloading operation procedure for a mixed operation of above-ground and in-ground storage tanks using dynamic simulation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902075k