Modeling and dynamic performance research on proton exchange membrane fuel cell system with hydrogen cycle and dead-ended anode

Abstract

In order to improve the response speed and output power of the system to ensure the safe and stable operation of the proton exchange membrane fuel cell system, it is necessary to control the gas supply system reasonably and effectively. In the present study, a system simulation model considering nitrogen crossover and water migration is established, which is in good agreement with the experimental results. By using this model, the pressure difference between the two sides of the membrane during purging was simulated, showing that the pressure difference was all less than 20 kPa. Increasing the pump speed is advantageous because hydrogen recovery increases the relative humidity of the anode inlet and avoids membrane drying of the anode inlet due to the lack of an external humidifier. When the anode recovery rate is at most 90%, the corresponding maximum relative humidity at the anode inlet is 0.45. When the humidity is constantly with the operating temperature at 60, 70 and 80°, the higher the operating temperature, the lower the output voltage. These results reveal that the hydrogen recirculation fuel cell system with dead-ended anode has good performance and the control strategy is effective.