| 摘要 |
PURPOSE:To change an electrode surface for cell reaction in connection with load current to keep current density constant by arranging a control means by which the amount of reaction gas supplied to a gas passage is variably controlled. CONSTITUTION:Doors 4 are installed in the opening of gas passages on each side of a stack 1. When only three of doors 4 on fuel side and oxidizing agent side are opened and other doors are closed, both of fuel gas and oxidizing agent gas are supplied to the slash mark portions in the figure, which are 1/4 of the total electrode area. By opening or closing doors 4 on fuel gas side and oxidizing agent gas side, the amount of reaction gas supplied to each gas passages, that is, effective reaction area in the total electrode area is variably controlled. By opening or closing doors in connection with variation of load current, current density in the electrode is kept almost constant. |
