| 摘要 |
PROBLEM TO BE SOLVED: To reduce a discharge amount of boil-off gas of liquid hydrogen discharged from a liquid hydrogen storage tank. SOLUTION: This liquid hydrogen storage device 3 comprises a liquid hydrogen storage tank 5 placed in a vacuum tank 12, a releasing valve 6 and a safety valve 7. When a pressure in the liquid hydrogen storage tank 5 reaches a working pressure P1, the releasing valve 6 opens to release gaseous hydrogen 9 in the liquid hydrogen storage tank 5 to the exterior. The working pressure P1 of the releasing valve 6 is set to a pressure (for example, 3 MPa) higher than the critical pressure (about 1.3 MPa) where the boiling point of the liquid hydrogen 8 reaches critical point.
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