Design of the compressor-assisted LNG fuel gas supply systems = 압축기를 활용한 LNG 연료공급 시스템의 설계

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dc.contributor.advisorChang, Dae Jun-
dc.contributor.authorPark, Hyunjun-
dc.description학위논문(석사) - 한국과학기술원 : 기계공학과, 2018.2,[vi, 33 p. :]-
dc.description.abstractThis study proposes an LNG fuel gas supply system, it is called the Compressor-Assisted Fuel Gas Supply System (CA-FGSS) which utilizes compressors for multi-purpose. In the CA-FGSS, the compressors are used not only to manage boil-off gas (BOG) in the LNG fuel tank but also to provide a pressure differential for drawing LNG from the tank. The operation sequence of the CA-FGSS is defined and the feasibility of the sequence is verified by dynamic process simulations. The CA-FGSS is applied to 2-stroke dual-fuel engines which require medium or high fuel gas injection pressure (16 or 300 bar). Availability analysis shows that the CA-FGSS had 99% system availability with the lesser number of redundant equipment than conventional pump-based FGSS (PB-FGSS) because CA-FGSS is free of components with high failure frequency and long maintenance time such as in-tank pumps installed in the LNG fuel tank. This result affects economic feasibility of the CA-FGSS, so the capital expenditure (CAPEX) of the CA-FGSS is 10% lower than that of the PB-FGSS. A sensitivity analysis for the entire propulsion system shows that the propulsion systems which adopt the CA-FGSS are more economical than the pump-based propulsion systems at the same pressure. On the other hand, high-pressure propulsion systems are more economical than the medium-pressure systems when the LNG fuel price is high.-
dc.subjectLNG▼aLNG fueled ship▼aFuel gas supply system (FGSS)▼aBoil-off gas (BOG)▼aBOG compressors▼aSystem availability▼aLife cycle cost (LCC)-
dc.subject액화천연가스▼aLNG 추친선박▼aLNG 연료공급 시스템▼aBOG 압축기▼a시스템 가용도-
dc.titleDesign of the compressor-assisted LNG fuel gas supply systems = 압축기를 활용한 LNG 연료공급 시스템의 설계-
dc.description.department한국과학기술원 :기계공학과,-
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