Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Experimental and Numerical Study of Berthing and Unberthing of LNG-Bunkering Vessels

실험 및 수치해석을 통한 LNG 벙커링 선박들의 이접안 안정성 평가 연구

  • Jung, Sung-Jun (Korea Research Institute of Ships and Ocean Engineering) ;
  • Oh, Seung-Hoon (Korea Research Institute of Ships and Ocean Engineering) ;
  • Jung, Dong-Woo (Korea Research Institute of Ships and Ocean Engineering) ;
  • Kim, Yun-Ho (Korea Research Institute of Ships and Ocean Engineering) ;
  • Jung, Dong-Ho (Korea Research Institute of Ships and Ocean Engineering)
  • Received : 2020.08.10
  • Accepted : 2020.10.12
  • Published : 2020.12.31
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Abstract

The IMO has adopted emission standards through Annex VI of the International Convention for the Prevention of Pollution from Ships (MARPOL) that strictly prohibit the use of bunker C oil for vessels. In this study, we have adopted the turret-moored Floating LNG-Bunkering Terminal (FLBT) which is designed to receive the LNG from LNGCs and transfer it to LNG-bunkering shuttles in side-by-side moored condition. Numerical analyses were carried out using the high-order boundary-element method for four vessels at various relative distances. Mean wave drift forces were compared in an operational sea state. A model test was performed in the ocean engineering basin at the Korea Research Institute of Ships & Ocean Engineering (KRISO) to verify the safety of the berthing/unberthing operation. In the model test, a jig was designed to simulate tug boats pushing or pulling the bunkering vessels, so that the friction force of the g operation was not affected. Safety depended on the environmental direction, with more stable operation possible if the heading-control function of FLBT is applied to avoid beam-sea conditions.

세계적인 환경오염 규제 및 IMO(국제해사기구)의 선박 연료 황 함유량 제한으로 LNG를 선박의 연료로 사용하는 연구 및 사업이 활발히 진행되고 있다. 본 연구에서는 기존 연구를 통해 개발된 부유식 LNG 벙커링 터미널(FLBT, Floating LNG bunkering terminal)을 대상으로, STS LNG 벙커링 작업을 위해 이접안 하는 과정을 벙커링 셔틀선의 환경하중을 모형시험과 수치해석으로 평가하였다. 고차경계요소법을 이용한 수치해석으로 가까운 위치에서 상호작용 하는 4척 선박들의 파랑표류력 변화를 검토하였다. 다양한 이접안 거리에 따라 파랑표류력이 크게 변함을 확인 했다. 모형시험은 선박해양플랜트연구소의 해양공학수조에서 이루어졌다. 모형시험에서는 예인선을 모사하여 대상선박을 밀고 당길 수 있는 치구를 고안하였으며 접안시 마찰력 등의 영향 없이 선박을 밀 수 있도록 하였다. 모형시험 결과 LNG벙커링 선박은 대부분의 1년 환경조건에서 안전한 이접안이 가능하였다. 파랑 방향에 따라 안정성의 차이가 존재함으로, FLBT의 Heading conrol 기능을 적용하여 횡파를 피한다면 더욱 안정적인 운용이 가능할 것이다.

Keywords

Acknowledgement

본 연구는 해양수산부의 LNG벙커링 핵심기술개발 및 체계구축사업 'LNG 벙커링 운영체계 및 위험도 평가기반 운영기술개발'에 의해 수행되었습니다.(PMS4310)

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