Case study on operating characteristics of gas fueled ship under the conditions of load variation
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The use of gas as fuel, particularly liquefied natural gas (LNG), has increased in recent years owing to its lower sulfur and particulate emissions compared to fuel oil or marine diesel oil. LNG is a low temperature, volatile fuel with very low flash point. The major challenges of using LNG are related to fuel bunkering, storing, and handling during ship operation. The main components of an LNG fuel system are the bunkering equipment, fuel tanks, vaporizers/heaters, pressure build-up units (PBUs), and gas controlling units. Low-pressure dual-fuel (DF) engines are predominant in small LNG-powered vessels and have been operating in many small- and medium-sized ferries or LNG-fueled generators.(Tamura, K., 2010; Esoy, V., 2011[1][2]) Small ships sailing at coast or offshore rarely have continuous operation at constant engine load in contrast to large ships sailing in the ocean. This is because ship operators need to change the engine load frequently due to various obstacles and narrow channels. Therefore, controlling the overall system performance of a gas supply system during transient operations and decision of bunkering time under a very poor infrastructure condition is crucial. In this study, we analyzed the fuel consumption, the system stability, and the dynamic characteristics in supplying fuel gas for operating conditions with frequent engine load changes using a commercial analysis program. For the model ship, we selected the ‘Econuri’, Asia’s first LNG-powered vessel, which is now in operation at Incheon Port of South Korea.
Abstract
The use of gas as fuel, particularly liquefied natural gas (LNG), has increased in recent years owing to its lower sulfur and particulate emissions compared to fuel oil or marine diesel oil. LNG is a low temperature, volatile fuel with very low flash point. The major challenges of using LNG are related to fuel bunkering, storing, and handling during ship operation. The main components of an LNG fuel system are the bunkering equipment, fuel tanks, vaporizers/heaters, pressure build-up units (PBUs), and gas controlling units. Low-pressure dual-fuel (DF) engines are predominant in small LNG-powered vessels and have been operating in many small- and medium-sized ferries or LNG-fueled generators.(Tamura, K., 2010; Esoy, V., 2011[1][2]) Small ships sailing at coast or offshore rarely have continuous operation at constant engine load in contrast to large ships sailing in the ocean. This is because ship operators need to change the engine load frequently due to various obstacles and narrow channels. Therefore, controlling the overall system performance of a gas supply system during transient operations and decision of bunkering time under a very poor infrastructure condition is crucial. In this study, we analyzed the fuel consumption, the system stability, and the dynamic characteristics in supplying fuel gas for operating conditions with frequent engine load changes using a commercial analysis program. For the model ship, we selected the ‘Econuri’, Asia’s first LNG-powered vessel, which is now in operation at Incheon Port of South Korea.
참고문헌 (16)
- K. Tumura, "Development of Efficient, Environmentally Friendly and Flexible Shipboard Regasification Vessel", Mitsubishi Heavy Industries Technical review, 47(3), pp.13~18 (2010)
- LNG-fuelled engines and Fuel systems for medium-speed engines in maritime application, "V. Esoy", Society of Automotive Engineers of Japan(SAE), ~, pp.SAE Technical Paper 2011-01-1998 (2011)
- M. Econnomides, "Compressed natural gas (CNG): An alternative to liquified natural gas (LNG)", Journal SPE Production and Operations, 21(2), pp.318~324 (2006)
- E. Gohary, "The future of natural gas as a fuel in marine gas turbine for LNG carriers", Proceedings of the Institution of Mechanical engineers, Part M: Journal of Engineering for the Maritime Environment, 226(4), pp.371~377 (2012)
- IMO, "International Code of Safety for Ships Using Gases or other Low-flashpoint Fuels (IGF Code)", ~ (2015)
- 김기평, "CFD Approach on Gas Explosion for SIL in Gas Fuelled Ship", 한국마린엔지니어링학회지, 39(2), pp.195~200 (2015), 한국마린엔지니어링학회[DOI]
- M. Oka, "Development of LNG facility for marine applications: MHI-GEMS", Mitsubishi Heavy Industries Technical review, 50(2), pp.5~11 (2013)
- 조현준, "천연가스 액화공정의 최적설계", Korean Chemical Engineering Research(HWAHAK KONGHAK), 51(1), pp.25~34 (2013), 한국화학공학회[DOI]
- D. C. Rennels, "Pipe Flow: A Practical and Comprehensive Guide" (2012), John Wiley & Sons
- N. Kim, "Design Optimization of a Low Pressure LNG Fuel Supply System", 석사, pp.2015
- "Aspen HYSYS"[URL]
- 이윤호, "Gas Fuelled Ship용 재기화 시스템의 Eglycol Water 혼합비율에 따른 시스템 특성분석", 한국마린엔지니어링학회지, 38(7), pp.799~805 (2014), 한국마린엔지니어링학회[DOI]
- M. C. Ekwonu, "Modelling and simulation of gas engines using aspen HYSYS", Journal of Engineering Science and Technology Review, 6(3), pp.1~4 (2013)
- Z. Yuan, "Performance improvement of a boil-off gas re-condensation process with pre-cooling at LNG terminals", International Journal of Thermodynamics (IJoT), 18(2), pp.74~80 (2015)
- ABS Rule, "Propulsion and Auxiliary Systems for Gas Fueled Ships", American Bureau of Shipping, ~ (2015)