| 摘要 |
PURPOSE:To eliminate causes for deteriorating cell characteristics by heating a fuel cell when an operation is stopped in the fuel cell which pinches a matrix holding the electrolyte such as phosphoric acid with a fuel electrode and oxidizer electrode. CONSTITUTION:In a fuel gas system, a fuel feed valve 17 is closed to cut off the fuel gas feed, the N2 gas is fed to a gas partition chamber 15 and pipeline system through an N2 gas feed valve 23, and the fuel gas barges in, then the N2 gas is filled under pressure. In an oxidizer gas system, an oxidizer feed valve 20 and oxidizer discharge valve 22 are closed to cut off the feed of the oxidizer gas and an intake of the outer air, a heater 25 is heated, and the oxidizer gas system, particularly a gas partition chamber 16 is heated by means of a circulating valve 13 and circulating fan 24. The heating temperature is kept at a level not lower than the crystal deposition temperature of phosphoric acid being held in a matrix 12. Thereby, the deposition of the electrolyte and cracks or interlayer flaking of a matrix membrane can be prevented from occurring. |
