Pressure recovery during pressure reduction experiment with large-scale liquid hydrogen tank
Pressure recovery during pressure reduction experiment with large-scale liquid hydrogen tank
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DOI：
10.1016/j.ijhydene.2020.12.184
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发表时间：
2021-02
影响因子：
7.2
通讯作者：
Kazuma Tani;T. Himeno;Yasunori Sakuma;Toshinori Watanabe;Hiroaki Kobayashi;Terukuni Toge;Syuntaro Unno;S. Kamiya;O. Muragishi;Katsuhiro Kanbe
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文献类型：
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作者：
Kazuma Tani;T. Himeno;Yasunori Sakuma;Toshinori Watanabe;Hiroaki Kobayashi;Terukuni Toge;Syuntaro Unno;S. Kamiya;O. Muragishi;Katsuhiro Kanbe
世界上第一艘液化氢（LH2）运输船已经建成，将把LH2从澳大利亚运输到日本。在日本港口，为了保证油罐的安全运行，需要降低油罐压力。但是，压力降低会引起闪蒸，导致排气能力过剩或液体泄漏。因此，本研究的目的是通过实验和数值方法分别阐明压降速率和液体行为。采用饱和LH2填充30 m3的储罐，进行高液位条件下的减压实验。实验表明，压力在减压开始时恢复，然后在平衡状态的基础上下降。通过基于VOF的内部CFD代码进行数值分析，发现压力恢复是由沸腾延迟引起的，并且在液体充分搅拌后，罐内压力跟随饱和压力。
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 m3tank 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.