| 摘要 |
PURPOSE:To enable a safe stand-by state to be maintained by providing an oxidizer supply line which supplies oxidizer at the tie of a stand-by state and an oxidizer supply valve which opens and closes the oxidizer supply line. CONSTITUTION:In a stand-by state, an anode gas supply valve 20 is closed, and a cathode air supply valve 21 is closed after supplying inert gas to a cathode electrode 3. An air supply valve 24 and a hydrogen supply valve 26 are open. With this arrangement, hydrogen rich gas is supplied to an anode electrode 2 from a hydrogen supply line 25 through the hydrogen supply valve 26. On the other hand, air is supplied to the cathode electrode 3 from an air supply line 23 through the air supply valve 24. Therefore, the hydrogen rich gas supplied to the anode electrode 2 and the air supplied to the cathode electrode 3 react to each other so as to get a little electric power. Accordingly, the excessive rise of the fuel concentration in the cathode electrode can be prevented so that a safe stand-by state can be maintained. |
