首页|Cascade JT systems with single-component refrigerants for hydrogen liquefaction
Cascade JT systems with single-component refrigerants for hydrogen liquefaction
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NSTL
Elsevier
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。
NSTL
Elsevier
