| 摘要 |
PROBLEM TO BE SOLVED: To dispense with installation of a gas processor so as to reduce the cost and size by supplying oxygen-containing gas to an oxygen electrode and hydrogen-containing gas to a fuel electrode for generating power and allowing existence of hydrogen in the oxygen electrode for restoring from deterioration. SOLUTION: In operation of a deterioration restoring process, an oxygen- containing gas switch valve Va2 is closed so as to shut off supply of oxygen- containing gas to respective cells C. Then, a hydrogen-containing gas switch valve Va1 is opened while a hydrogen-containing gas supply amount is regulated by means of a proportional valve Vp1 so that a hydrogen using rate becomes about 70%, and a switch 14 is closed for regulating an external power source 15 so that the value and the direction of current flowing through in each cell C are equalized to those of the normal operation time. Therefore, hydrogen- containing gas is fed to a fuel electrode in each cell C, supply of oxygen- containing gas to an oxygen electrode in each cell is stopped, and current in the same direction as that in a power generation state flows in each cell C, so that hydrogen is generated in the oxygen electrode in each cell and a deterioration restoring process is carried out. |
