New generation hydrogen liquefaction technology by transonic two-phase expander

Aihong Zou, Yupei Zeng and Ercang Luo

Energy, 2023, vol. 272, issue C

Abstract: Hydrogen liquefaction is the key solution of large-scale utilization of hydrogen energy. Compared with traditional hydrogen liquefaction technology regarding turbo-expander expansion which is suffering high-speed rotation with bearing sealing problems, the transonic two-phase expander is innovatively employed to complete expansion refrigeration and condensation phase change in a compact space. Its significance is to realize isentropic expansion and direct liquefaction without moving parts. In the hydrogen transonic two-phase expander, transonic nozzle is the key component. The flow liquefaction characteristics of hydrogen transonic nozzles under different working conditions are investigated. The main findings include: (1) when the inlet temperature reduces by the same percentage, the liquid mass fraction is 1.7 times as much as when the inlet pressure increases by the same percentage. (2) when the inlet temperature decreases from 60 K to 52.5 K, the liquid mass fraction increases from 0.095 to 0.161, an increase of 69.5%. (3) When the inlet pressure increases from 8000 kPa to 9000 kPa, the liquid mass fraction increases from 0.095 to 0.133, the liquid mass fraction increases by 40.0%. This research supports the development of new generation hydrogen liquefaction technology, which has important strategic value for promoting the development of clean energy industry.

Keywords: Hydrogen liquefaction; Hydrogen transonic two-phase expander; Hydrogen transonic nozzle (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:272:y:2023:i:c:s0360544223005443

DOI: 10.1016/j.energy.2023.127150

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