# Publication

International Conference
2013.12.04 14:08

# Kyu-Yeul Lee, Ju-Hwan Cha, Joon-Chae Lee, Myung-Il Roh, Ji-Hyun Hwang, "Determination of the Optimal Operating Condition of Dual Mixed Refrigerant Cycle at the Pre-FEED Stage of LNG FPSO Topside Liquefaction Process", Proceedings of ISOPE(International Society of Offshore and Polar Engineers) 2011, Maui, USA, pp. 151-158, 2011.06.19-24

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Abstract The dual mixed refrigerant (DMR) cycle, which pre-cools natural gas with the mixed refrigerants and then liquefies the natural gas with another set of mixed refrigerants, is well known for having the highest efficiency among the liquefaction cycles. Its possible application to LNG FPSO is also extensively investigated. In this study, the optimal operating conditions, such as the equipment's flow rate, pressure, temperature, and refrigerant composition per flow of the DMR cycle, were determined in consideration of power efficiency. To determine the optimal operating conditions, a mathematical model was formulated based on the mathematical model of the single mixed refrigerant (SMR) cycle with additional consideration of tees, phase separators, and common headers. In the mathematical model, the 227 operating conditions were defined as unknowns and 196 equality constraints related to the thermodynamics for the equipment were formulated. Further, the 15 given variables related to the natural gas, compressor efficiency and seawater coolers were used. This mathematical model can be regarded as the optimization problem, in which the number of unknowns is larger than the total number of equality constraints and given variables. To obtain the optimal operating conditions, the minimization of the required power for the compressors at the cycle was defined as an objective function. Moreover, set as design variables were the 16 operating conditions, such as flow rate, pressure, temperature and composition of the main and precooling refrigerant, natural gas temperature after precooling, and flow rate ratio for the tee. In addition, the temperature conditions for the equipment’s operation were used as inequality constraints. The optimal operating conditions were then obtained by using a hybrid optimization method that consists of the genetic algorithm (GA) and sequential quadratic programming (SQP). The calculation results show that the required power at the obtained conditions was decreased by 34.5% compared with that of the relevant patent obtained in 2001, and 1.2% compared with the corresponding value from the past relevant study carried out in 2008. 2011-06-19

Kyu-Yeul Lee, Ju-Hwan Cha, Joon-Chae Lee, Myung-Il Roh, Ji-Hyun Hwang, "Determination of the Optimal Operating Condition of Dual Mixed Refrigerant Cycle at the Pre-FEED Stage of LNG FPSO Topside Liquefaction Process", Proceedings of ISOPE(International Society of Offshore and Polar Engineers) 2011, Maui, USA, pp. 151-158, 2011.06.19-24

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List of Articles
번호 분류 제목 Publication Date
447 Domestic Conference 최종문, 노명일, "유전적 프로그래밍을 이용한 선박의 연료 소모량 추정식 개발", 2011년도 한국CAD/CAM학회 학술발표회, 평창, pp. 887-894, 2011.01.26-28 2011-01-26
446 Domestic Conference 임병석, 서연미, 최종문, 노명일, "시뮬레이션 기법을 활용한 선박 충돌 회피 전략 도출에 관한 연구", 2011년도 한국CAD/CAM학회 학술발표회, 평창, pp. 1117-1126, 2011.01.26-28 2011-01-26
445 Domestic Conference 김주영, 최종문, 서연미, 노명일, "실시간 해상 정보 취득과 연료 소모량 추정을 기반으로 한 선박 경제 운항 경로 결정 방법", 2011년도 한국CAD/CAM학회 학술발표회, 평창, pp. 1140-1146, 2011.01.26-28 2011-01-26
444 Domestic Conference 조두연, 차주환, 노명일, 최형순, 황호진, "3D 선체 모델과 Assembly Tree를 이용한 정반 배치 방법론 연구", 2011년도 대한조선학회 춘계학술발표회, 부산, pp. 524-527, 2011.06.02-03 2011-06-02
443 Domestic Conference 구남국, 이준채, 황지현, 노명일, 이규열, "LNG FPSO 의 Liquefaction Process 을 위한 장비의 최적 다층 배치", 2011년도 대한조선학회 춘계학술발표회, 부산, pp. 562-572, 2011.06.02-03 2011-06-02
442 Domestic Conference 송에스더, 노명일, "인클루시브 디자인 개념을 적용한 크루즈선의 편의 지향 설계", 2011년도 대한조선학회 춘계학술발표회, 부산, pp. 648-655, 2011.06.02-03 2011-06-02
441 Conference Chairman 설계 및 법규 (A3), 2011년도 대한조선학회 춘계학술발표회, 부산, 2011.06.02-03 2011-06-03
» International Conference Kyu-Yeul Lee, Ju-Hwan Cha, Joon-Chae Lee, Myung-Il Roh, Ji-Hyun Hwang, "Determination of the Optimal Operating Condition of Dual Mixed Refrigerant Cycle at the Pre-FEED Stage of LNG FPSO Topside Liquefaction Process", Proceedings of ISOPE(International Society of Offshore and Polar Engineers) 2011, Maui, USA, pp. 151-158, 2011.06.19-24 2011-06-19
439 Domestic Conference 이준채, 구남국, 이규열, 차주환, 노명일, 황지현, "LNG FPSO Topside 액화 공정 Dual Mixed Refrigerant Cycle의 최적 운전 조건 결정", 2011년도 해양플랜트설계연구회 춘계 워크샵, 울산, pp. 1-23, 2011.07.07-08 2011-07-07
438 International Conference Nam-Kug Ku, Ara Jo, Sol Ha, Myung-Il Roh, Kyu-Yeul Lee, "Automatic Generation of Equations of Motion for Multibody System in Discrete Event Simulation Framework", Proceedings of INSODE 2011, Istanbul, Turkey, pp. 55-64, 2011.09.02-04 2011-09-02
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