车载高压氢气分级充注系统的设计与模拟

研究单级氢气充注时,氢气充注速率、初始温度和压力对氢气终了温度的影响。通过调用NIST REFPROP 中标准氢状态方程,模拟氢气在充注过程温度、压力、充注率等参数的变化。设计和模拟两级和三级氢气充注系统。结果表明：多级充注时,存在最佳的中间压力,使得充灌终了氢气温度最低,且增加级数可降低终了氢气温度。最后,对多级充注系统的能耗进行分析,结果表明随着级数的增加,系统的总能耗降低。

DESIGN AND SIMULATION OF A VEHICLE-MOUNTED HIGH-PRESSURE HYDROGEN STAGED CHARGING SYSTEM

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.