선박용 액화천연가스 기화기의 열전달 특성의 수치해석
Numerical analysis of LNG vaporizer heat transfer characteristic in LNG fuel ship
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초록
본 논문은 액화 천연 가스(LNG)를 주 연료로 사용하는 선박용의 LNG기화기의 특성을 조사하기위하여 기화기 내부에서의 열전달 특성을 연구하였다. LNG를 기화하기 위한 가열열원으로서는주 엔진에서 발생하는 워터 쟈켓의 가온수를 직접 이용하지 않고 열교환기를 통하여 간접 가열된글리콜 워터(Glycol Water)를 사용하는 시스템을 채택하였다. LNG의 기화 과정은 상변화를 동반하기 때문에 이를 검증하기 위하여 액화질소(LN2)의 기화과정을 통하여 신뢰성을 확보하였고, LNG 기화기 내부의 최적 열적특성을 도출하기 위하여 LNG의 유입량과 가열열원인 글리콜 워터 유량변화에 대한 LNG 기화특성을 연구하였다. 해석 결과 LNG 질량유량이 0.111 kg/s과 가열원수인 부동액 질량유량이 1.805 kg/s일 경우 가스 출구 온도는 약 6 ℃로서 LNG 선박의 최적 운전 조건임을알 수 있었다.
Abstract
The heat transfer characteristics of LNG(Liquefied Natural Gas) vaporizer on the ship was performed by numerical simulation to get the optimum NG(Natural Gas) generating condition. The glycol-water was used for heating in LNG vaporizer, and the cooling water of main engine was used as heating souse for glycol-water. This cooling water temperature increases again after recirculating from the main engine, and then it can be used to heat the glycol-water. The numerical analysis results has good agreement with the experimental results by liquid nitrogen for validation. So CFD technique was used to simulate the heat transfer characteristics of LNG vaporizer on the ship. The numerical results show that the operation condition of LNG vaporizer shows NG temperature of 6℃ in the outlet of LNG vaporizer, and the mass flow rates of LNG and glycol-water were showed 0.111 kg/s and 1.805 kg/s,respectively.
참고문헌 (9)
- J. H. Song, "Heat transfer characteristic of a supercritical fluid flow in a vertical pipe", The Journal of Supercritical Fluids, 44(2), pp.164~171 (2008)
- Y. H. Lee, "Experimental Study of Shell and Tube Heat Exchanger Performance with Baffle Spacing", The Korean Society of Mechanical Engineers Conference Books, 25(12), pp.1748~1755 (2001)
- V. A. Bogachev, "Measurement of heat transfer to supercritical helium in vertical tubes under forced and mixed convection conditions", Cryogenics, 25, pp.198~201 (1985)
- Pie-Xue Jiang, "Experimental investigation of local heat transfer of carbon dioxide at supercritical pressures in a vertical tube and multi port mini chanel under cooling conditions", International Refrigeration and Air Conditioning Conference, pp.892~ (2008), Purdue University
- P. Zhang, "Flow and heat transfer characteristic of supercritical nitrogen in a vertical mini-tube", International Journal of Thermal Science, pp.1~9 (2010)
- S. He, "A computational of convection heat transfer to CO2 at supercritical pressures in a vertical mini tube", International Journal of Thermal Science, 44, pp.521~530 (2005)
- J. D. Jackson, "Influence of buoyancy on heat transfer to fluids flowing in vertical tubes under turbulent conditions, In Turbulence Forced Convection in Chanel and Bundles, vol. 2", pp.613~640 (1979), Hemisphere Publishing Corporation
- H. Tatsumoto, "Forced convection heat transfer of subcooled liquid nitrogen in a vertical tube", Journal of Physics: Conference Series (2010)
- R. H. Perry, "Chemical Engineers Handbook (7th Eds.)" (1997), McGraw-Hill