LNG C-type Tank 내부 천연가스의 안전 배출조건에 대한 가이드 라인 제시를 위한 수치해석적 연구 A Numerical Study on Suggesting Guidelines for Safe Venting Conditions of Natural Gas in LNG C-type Tank
pp.617-624
LNG propulsion ships are actively being built as an eco-friendly fuel for ships, and ships with C-type LNG tanks are being widely built. In order to analyze the risk of LNG venting from operating ships and test-run ships, the flow characteristics according to operating conditions were reviewed using ANSYS FLUENT, a computational fluid dynamics (CFD) software. As a result of the study, it was confirmed that the distribution area exceeding the lower explosion limit of natural gas and the area where the natural gas temperature rose to 17 ° C had similarities. In addition, it was confirmed that the change in the horizontal direction was greater than the change in the vertical direction when the natural gas distribution range was changed. Since the valve opening has a greater effect than the tank pressure, if natural gas must be vented to the atmosphere inevitably, the risk can be reduced by operating the valve opening at 50% or less.