LIQUID HYDROGEN PRODUCTION DEVICE
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United States of America Patent
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Issued Date -
Mar 12, 2015
app pub date -
Apr 17, 2013
filing date -
May 22, 2012
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Abstract
A device (HS) is provided with a refrigeration cycle unit (R) and a liquid hydrogen generation unit (P) for generating liquid hydrogen by cooling high-pressure raw material hydrogen by means of the refrigeration cycle unit (R) and by adiabatically expanding said raw material hydrogen by means of a Joule-Thomson valve (12). A first and second heat exchanger (E1, E2) are disposed along the refrigeration cycle unit (R) and the liquid hydrogen generation unit (P). The device (HS) is provided with a mechanism for generating liquid hydrogen by re-liquefying the boil-off gas generated in a liquid hydrogen storage tank. The boil-off gas is introduced into a hydrogen circulation path (1) at a section at which circulating hydrogen having an extremely low temperature flows, and the excessive circulating hydrogen generated therefrom is discharged to a raw material hydrogen path (11) from a section at which the circulating hydrogen is at room temperature.
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