1. Pressure recovery during pressure reduction experiment with large-scale liquid hydrogen tank
- Author
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Toshinori Watanabe, Shoji Kamiya, Kazuma Tani, Takehiro Himeno, Yasunori Sakuma, Terukuni Toge, Osamu Muragishi, Hiroaki Kobayashi, Syuntaro Unno, and Katsuhiro Kanbe
- Subjects
Hydrogen ,Renewable Energy, Sustainability and the Environment ,Vapor pressure ,Thermodynamic equilibrium ,Energy Engineering and Power Technology ,chemistry.chemical_element ,02 engineering and technology ,Mechanics ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Flashing ,01 natural sciences ,0104 chemical sciences ,Superheating ,Fuel Technology ,chemistry ,Cabin pressurization ,Volume of fluid method ,Environmental science ,0210 nano-technology ,Liquid hydrogen - Abstract
The world's first Liquefied Hydrogen (LH2) Carrier which will transport LH2 from Australia to Japan has been built. At Japanese port, reducing the tank pressure will be required for the safe tank operation. However, pressure reduction will cause flashing, leading to an excess of the venting capacity or liquid leakage. Hence, the purpose of this research is to clarify the pressure reduction rate and liquid behavior through experimental and numerical approaches respectively. Pressure reduction experiment under high liquid level condition was conducted by using 30 m3 tank filled with saturated LH2. The experiment showed that the pressure recovery occurred at the beginning of depressurization, and then the pressure decreased based on the equilibrium state. From numerical analysis by VOF based in-house CFD code, it was found that the pressure recovery was caused by the boiling delay, and the tank pressure followed the saturation pressure after the liquid fully stirred.
- Published
- 2021