Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Multi-floor Layout for the Liquefaction Process Systems of LNG FPSO Using the Optimization Technique

최적화 기법을 이용한 LNG FPSO 액화 공정 장비의 다층 배치

  • Ku, Nam-Kug (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Lee, Joon-Chae (Department of Naval Architecture and Ocean Engineering, Seoul 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)
  • 구남국 (서울대학교 조선해양공학과 대학원) ;
  • 이준채 (서울대학교 조선해양공학과 대학원) ;
  • 노명일 (울산대학교 조선해양공학부) ;
  • 황지현 (서울대학교 조선해양공학과 대학원) ;
  • 이규열 (서울대학교 조선해양공학과 및 해양시스템공학연구소)
  • Received : 2011.11.01
  • Accepted : 2011.12.30
  • Published : 2012.02.20
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Abstract

A layout of an LNG FPSO should be elaborately determined as compared with that of an onshore plant because many topside process systems are installed on the limited area; the deck of the LNG FPSO. Especially, the layout should be made as multi-deck, not single-deck and have a minimum area. In this study, a multi-floor layout for the liquefaction process, the dual mixed refrigerant(DMR) cycle, of LNG FPSO was determined by using the optimization technique. For this, an optimization problem for the multi-floor layout was mathematically formulated. The problem consists of 589 design variables representing the positions of topside process systems, 125 equality constraints and 2,315 inequality constraints representing limitations on the layout of them, and an objective function representing the total layout cost. To solve the problem, a hybrid optimization method that consists of the genetic algorithm(GA) and sequential quadratic programming(SQP) was used in this study. As a result, we can obtain a multi-floor layout for the liquefaction process of the LNG FPSO which satisfies all constraints related to limitations on the layout.

Keywords

References

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