Abstract
A novel hydrogen liquefaction process based on precooled mixed refrigerant is proposed in this paper. The specific energy and the exergy loss are also analyzed. The feed gas with a temperature of 302K and a pressure of 2.012MPa is first precooled to 81K with mixed refrigerant. Three refrigerant cycles with hydrogen expanders and one with throttling valves are adopted to cool the gaseous hydrogen to 21K. The proportion of para-hydrogen of the product is 99%. The specific energy consumption of the process is 9.28 kW·h/kgLH2 and the exergy efficiency is 24.3%. Furthermore, the exergy analysis indicates that the exergy loss caused by heat exchangers, compressors and expanders weights the most.
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