| 摘要 |
PURPOSE: To high-efficiently and economically manufacture liquid hydrogen by a method wherein hydrogen gas is introduced to an expansion turbine arranged at a cooling liquefying system for hydrogen and expanded to a pressure higher than a critical pressure for output. CONSTITUTION: Hydrogen gas in a supercritical pressure state outputted from a third heat-exchanger 33 is introduced in an expansion turbine 51, wherein the hydrogen gas undergoes adiabatic expansion to a critical pressure to generate cold. The hydrogen gas in a supercritical state after expansion is adiabatically processed by an ortho-to-para converter 44, and continuously cooled and processed in the passage of an ortho-to-para converter 45 of a heat- exchanger 34. Joule-Thomson expansion is effected by a JT valve 61 to generate hydrogen in a gas-liquid phase. The liquid hydrogen in a gas-liquid phase is further cooled in a liquid hydrogen reservoir 81 and after the liquid hydrogen is further converted by an ortho-to-para converter 46 located in the liquid hydrogen reservoir 81, the liquid hydrogen is taken out as product liquid hydrogen from a liquid hydrogen sampling route 12. |
