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

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This 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.
Advisors
Chang, Dae Junresearcher장대준researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2018.2,[vi, 33 p. :]

Keywords

LNG▼aLNG fueled ship▼aFuel gas supply system (FGSS)▼aBoil-off gas (BOG)▼aBOG compressors▼aSystem availability▼aLife cycle cost (LCC); 액화천연가스▼aLNG 추친선박▼aLNG 연료공급 시스템▼aBOG 압축기▼a시스템 가용도

URI
http://hdl.handle.net/10203/265934
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=733729&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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