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http://dx.doi.org/10.3744/SNAK.2012.49.1.33

Determination of the Optimal Operating Condition of Dual Mixed Refrigerant Cycle of LNG FPSO Topside Liquefaction Process  

Lee, Joon-Chae (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Cha, Ju-Hwan (Department of Ocean Engineering, Mokpo National University)
Roh, Myung-Il (School of Naval Architecture and Ocean Engineering, University of Ulsan)
Hwang, Ji-Hyun (Department of Naval Architecture and Ocean Engineering, Seoul National University)
Lee, Kyu-Yeul (Department of Naval Architecture and Ocean Engineering, Research Institute of Marine Systems Engineering, Seoul National University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.49, no.1, 2012 , pp. 33-44 More about this Journal
Abstract
In this study, the optimal operating conditions for the dual mixed refrigerant(DMR) cycle were determined by considering the power efficiency. The DMR cycle consists of compressors, heat exchangers, seawater coolers, valves, phase separators, tees, and common headers, and the operating conditions include the equipment's flow rate, pressure, temperature, and refrigerant composition per flow. First, a mathematical model of the DMR cycle was formulated in this study by referring to the results of a past study that formulated a mathematical model of the single mixed refrigerant(SMR) cycle, which consists of compressors, heat exchangers, seawater coolers, and valves, and by considering as well the tees, phase separators, and common headers. Finally, in this study, the optimal operating conditions from the formulated mathematical model was obtained using a hybrid optimization method that consists of the genetic algorithm(GA) and sequential quadratic programming(SQP). Moreover, the required power at the obtained conditions was decreased by 1.4% compared with the corresponding value from the past relevant study of Venkatarathnam.
Keywords
LNG FPSO; Topside liquefaction process; Dual mixed refrigerant cycle; Optimization;
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Times Cited By KSCI : 2  (Citation Analysis)
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