| 摘要 |
PROBLEM TO BE SOLVED: To improve controllability of the pressure difference between poles in a fuel circulating fuel cell system. SOLUTION: A fuel gas, hydrogen, is depressurized by a fuel gas pressure control valve 7, a made to flow through a hydrogen supply channel 8 into an anode humidifier 9, humidified therein, and fed to the anode of the fuel cell 1. The hydrogen off-gas discharged from the fuel cell 1 is pressurized by a hydrogen pump 11, and returned to the hydrogen supply channel 8 to be circulated. An oxidizing gas, air, is pressurized by a compressor 2, humidified in a cathode humidifier 4, and fed to the cathode of the fuel cell 1. The air off-gas discharged from the fuel cell 1 is released through a pressure control valve 6 into the air. The air pressurized by the compressor 2 is introduced to the fuel gas pressure control valve 7 as a signal pressure, based on which the valve opening of the fuel gas pressure control valve 7 is adjusted so as to hold the pressure difference between the poles of the fuel cell 1 within a predetermined range. |
