ScholarWorks@중앙대학교

초록

This study presents a dynamic simulation of a hydrogen liquefaction process using a helium Brayton cycle under partial load conditions. Hydrogen feed flow was reduced to 90%, 80%, and 70% of the design value and temperature, pressure, and energy consumption across heat exchangers and rotating equipment were evaluated. Results showed that insufficient reduction in helium flow caused subcooling, lowering the liquid hydrogen temperature from 20.5K to 19.5K. Furthermore, due to the lower efficiency of the expander compared to the compressor, the decrease in recoverable energy exceeded the reduction in compression work, resulting in a 44.1% increased specific energy consumption. These findings emphasize the need for precise control of helium flow and operating conditions during partial load operation. Additionally, improving the performance of rotating equipment such as compressors and expanders is essential for enhancing the energy efficiency of hydrogen liquefaction systems.

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