LNG 화물창 방열재 균열에 따른 액화천연가스의 확산 및 온도 예측을 위한 수치 모델 (Numerical Model of Heat Diffusion and Evaporation by LNG Leakage at Membrane Insulation)

서지정보

· 발행기관 : 한국해양공학회
· 수록지 정보 : 한국해양공학회지 / 28권 / 6호 / 517 ~ 526페이지
· 저자명 : 이장현, 김윤조, 황세윤

초록

The leakage of cryogenic LNG through cracks in the insulation membrane of an LNG carrier causes the hull structure to experiencea cold spot as a result of the heat transfer from the LNG. The hull structure will become brittle at this cold spot and the evaporated natural gasmay potentially lead to a hazard because of its flammability. This paper presents a computational model for the LNG flow and heat diffusion in anLNG insulation panel subject to leakage. The temperature distribution in the insulation panel and the speed of gas diffusion through it aresimulated to assess the safety level of an LNG carrier subject that experiences a leak. The behavior of the leaked LNG is modeled using amultiphase flow that considers the mixture of liquid and gas. The simulation model considers the phase change of the LNG, gas-liquid multiphaseinteractions in the porous media, and accompanying rates of heat transfer. It is assumed that the NO96-GW membrane storage is composed of glasswool and plywood for the numerical simulation. In the numerical simulation, the seepage, heat diffusion, and evaporation of the LNG areinvestigated. It is found that the diffusion speed of the leakage is very high to accelerate the evaporation of the LNG.

영어초록

The leakage of cryogenic LNG through cracks in the insulation membrane of an LNG carrier causes the hull structure to experiencea cold spot as a result of the heat transfer from the LNG. The hull structure will become brittle at this cold spot and the evaporated natural gasmay potentially lead to a hazard because of its flammability. This paper presents a computational model for the LNG flow and heat diffusion in anLNG insulation panel subject to leakage. The temperature distribution in the insulation panel and the speed of gas diffusion through it aresimulated to assess the safety level of an LNG carrier subject that experiences a leak. The behavior of the leaked LNG is modeled using amultiphase flow that considers the mixture of liquid and gas. The simulation model considers the phase change of the LNG, gas-liquid multiphaseinteractions in the porous media, and accompanying rates of heat transfer. It is assumed that the NO96-GW membrane storage is composed of glasswool and plywood for the numerical simulation. In the numerical simulation, the seepage, heat diffusion, and evaporation of the LNG areinvestigated. It is found that the diffusion speed of the leakage is very high to accelerate the evaporation of the LNG.

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