Numerical Analysis and Experimental Verification Based on Design Parameter Variation of Vacuum-Insulated Pipe for Cryogenics

Abstract

Abstract. Since natural gas is mainly transported or supplied in a liquefied state under high pressure, BOG (boil off gas) is frequently generated due to the adiabatic relation outside the pipe. To reduce BOG, various studies are being conducted. Recently, vacuum-insulated pipes are mainly used. Thus, in this study, temperature distribution in a vacuum-insulated pipe was observed through thermal analysis with the pipe type and diameter as design parameters. Additionally, thermal analysis was verified through an experiment under the same condition. BOG was calculated based on numerical analysis verification results and the heat transfer performance was confirmed. In addition, the generated thermal stress and thermal deformation changes were observed by implementing the temperature distribution obtained through the thermal analysis in thermalstructure coupling analysis. Accordingly, the structural safety of a vacuum-insulated pipe was evaluated.

Boil-Off Gas Generation in Vacuum-Jacketed Valve Used in Liquid Hydrogen Storage Tank

“…They found that a lower filling rate resulted in a higher proportion of vaporized liquid hydrogen and identified an interaction between the filling rate and the direction of gravity. Lee et al [7] conducted a thermal analysis and experiments on vacuum-insulated bellows and joint-type pipes to compare and verify the generation of BOG. The results from the analysis and experiments were in agreement within 5%.…”