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http://dx.doi.org/10.3744/SNAK.2010.47.5.733

Determination of the Optimal Operating Condition of the Hamworthy Mark I Cycle for LNG-FPSO  

Cha, Ju-Hwan (Engineering Research Center, Seoul National University)
Lee, Joon-Chae (Department of the Naval Architecture & Ocean Engineering, Seoul National University)
Roh, Myung-Il (School of Naval Architecture and Ocean Engineering, University of Ulsan)
Lee, Kyu-Yeul (Department of the Naval Architecture & Ocean Engineering, Seoul National University and Research Institute of Marine Systems Engineering, Seoul National University)
Publication Information
Journal of the Society of Naval Architects of Korea / v.47, no.5, 2010 , pp. 733-742 More about this Journal
Abstract
In this study, optimization was performed to improve the conventional liquefaction process of offshore plants, such as a LNG-FPSO(Liquefied Natural Gas-Floating, Production, Storage, and Offloading unit) by maximizing the energy efficiency of the process. The major equipments of the liquefaction process are compressors, expanders, and heat exchangers. These are connected by stream which has some thermodynamic properties, such as the temperature, pressure, enthalpy or specific volume, and entropy. For this, a process design problem for the liquefaction process of offshore plants was mathematically formulated as an optimization problem. The minimization of the total energy requirement of the liquefaction process was used as an objective function. Governing equations and other equations derived from thermodynamic laws acted as constraints. To solve this problem, the sequential quadratic programming(SQP) method was used. To evaluate the proposed method in this study, it was applied to the natural gas liquefaction process of the LNG-FPSO. The result showed that the proposed method could present the improved liquefaction process minimizing the total energy requirement as compared to conventional process.
Keywords
Offshore plant; Optimization; Liquefaction process; Brayton cycle; Natural gas;
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