抄録
In the case of a fuel cell system using pure hydrogen as fuel, high hydrogen utilization operation is required because the exhausted hydrogen from fuel cell is not required as a heat source for a reformer. While the hydrogen utilization operation is very high, a minor imbalance of the distributed flow causes a shortage of hydrogen gas. In order to achieve the high hydrogen utilization operation, a cell humidified at the cathode side and two block divided stack which the hydrogen gas would be fed to the first block with its exhaust hydrogen being fed to the second block were developed. 5kW class(100 cells) short stack developed with a cell humidified at the cathode and two block divided stack showed the stable operation at high hydrogen utilization operation up to 98%.
