| 摘要 |
PURPOSE: To keep concentration of hydrogen gas on a fuel pole within a fixed range, while the cell is in no operation, by controlling a flow rate of supplying the fuel gas to the fuel pole on the base of the concentration of hydrogen gas, which is at the outlet side of the fuel pole in the fuel cell, and the cell voltage. CONSTITUTION:A gas-concentration detector 7 is installed into an exhaustion line 8 from a fuel pole 2 in a fuel cell 1, so that output is sent out on the concentration of hydrogen gas below its regulated value and being stopped above the value. On the other hand, a voltage detector 9 is installed across the output of the cell 1, so that the output is sent out at the voltage below its regulated value and being stopped above the value. AND of both outputs is made in an AND circuit 10, to control a fuel gas supplying regulation valve 5 installed on a supply line 6. Hence, concentration of the hydrogen gas on the fuel pole 2, while the cell 1 is in no operation, can be exactly kept within a fixed range, and suppression of a rise in cell voltage enables the fuel pole 2 to be protected and reliability to be improved. |
