The Study On The Influence Of Vacuum LNG Fuel Tank Piping On Heat Leakage

With environment problem going increasingly seriously, people now have increasingly urgent demand for clean energy. Natural gas is a kind of low pollution combustible gas, and it is colorless, tasteless. Its main composition is methane. Compared to coal and petroleum, natural gas can effectively reduce the emissions of carbon dioxide and nitrogen, and produce no sulfide. Due to its low pollution and favorable economic performance, natural gas has been taking more and more important position in the energy consumption.LNG’s boiling point is about-163℃, after the liquefaction of natural gas, LNG needs to be stored in special hypothermal storage tank. The storage tank style is divided into fixed and mobile to meet different needs, fixed storage tank is mainly used for LNG receiving station, and mobile storage tank is mainly used to transport and consume LNG. Independent type C tank is the one of the most commonly used forms of Marine transportation because of its good capacity utilization and process complexity.Both domestic and overseas scholars have much research on the heat leakage of hypothermal tank but little on pipes’ effect. It is not an accurate method to predict boil-off-rate while ignoring the pipes ’effect. Considering this situation, this paper proposed a thought to use ANSYS to analysis the effect of pipes. To draw a suitable conclusion, this paper respectively analysis diameter, thickness and length. It can be seen that the heat leakage goes up with the increase of diameter and thickness, while the effect of length has a minimum value. At the meantime, different heat conduction of the insulating layer has also been studied, and it is conclude that the bigger of heat conduction, the smaller of the pipe’s effect on heat leakage.