Cascade JT systems with single-component refrigerants for hydrogen liquefaction
- Authors
- Chang, Ho-Myung; Park, Min Gyun
- Issue Date
- 1-Jan-2022
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Hydrogen liquefaction; JT cycle; Cascade system; Single-component refrigerant
- Citation
- CRYOGENICS, v.121
- Journal Title
- CRYOGENICS
- Volume
- 121
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/24333
- DOI
- 10.1016/j.cryogenics.2021.103410
- ISSN
- 0011-2275
- Abstract
- A thermodynamic study is carried out for hydrogen liquefaction with cascade Joule-Thomson (JT) systems, which do not require any expansion machines. Since there is no moving part at cryogenic temperatures, the cascade JT systems have a potential advantage of high reliability and easy scale-up of liquefaction capacity, as demonstrated in the full-scale LNG plants under operation. A variety of combinations for pre-cooling JT cycles with single-component refrigerants (including neon, nitrogen, argon, oxygen, hydrocarbons, and ammonia) are investigated to estimate the figure of merit (FOM) as a performance index of liquefaction. In every JT cycle, the pressure levels are optimized to maximize the FOM with a process simulator (Aspen HYSYS) and real properties of working fluids (NIST REFPROP). It is rigorously shown that the cascade JT systems can achieve a reasonably high FOM, if the irreversibility below 77 K is effectively reduced. A few suitable cascade systems for large capacity hydrogen liquefaction are identified, and the details of optimized cycles are presented.
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Collections - College of Engineering > Department of Mechanical and System Design Engineering > 1. Journal Articles
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