The efficient and safe storage of hydrogen is one of the key problems to be solved in hydrogen utilization. During the hydrogen filling process, the temperature increases due to the adiabatic compression, which may lead to safety issues when it exceeds the limit temperature （85 ℃） of carbon fiber materials inside of the hydrogen storage tanks. Therefore, the influences of hydrogen charging rate, initial temperature and pressure on the final temperature of hydrogen were studied. By calling the standard hydrogen state equation in the NIST REFPROP, the changes of hydrogen parameters such as temperature, pressure and rate of hydrogen charging during the filling process are simulated. Two-stage and three-stage hydrogen filling systems are designed and simulated. The results show that there is an optimal intermediate pressure, which makes the temperature of hydrogen at the end of filling lowest, and the temperature at the end of filling can be reduced by increasing the number of stages. Finally, this work analyzes the energy consumption of the multistage charging system, and the results show that the total energy consumption of the system decreases with the increase of the number of stages.
Key words
hydrogen /
hydrogen storage /
hydrogen energy /
pressure /
energy consumption /
grading filling system
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