| 摘要 |
PURPOSE: To adequately hold the state of an electrolyte film to stabilize operation by controlling the flow of a heating medium to a solid polymer fuel cell to control cell surface inside temperature distribution so that reaction gas outlet side temperature is always higher than others. CONSTITUTION: An electrolyte layer made of a solid polymer film is interposed between a fuel electrode and an oxidizing agent electrode to constitute a cell. A plurality of cells are stacked through a separator, and a heating medium flow path is arranged to form a stack 11. A fuel gas and an oxidizing gas are supplied to the cell to generate d.c. power. In the solid polymer fuel cell, valves 3 to 6 are installed in heating medium flow paths 13 to 17 for circulating a heating medium to the stack 11. In the start of operation of the cell or during low load operation, the heating medium is passed from the lower part of the cell surface to the upper part. During normal operation, a cooling medium is passed from the upper part to the lower part. Cell surface inside temperature is adequately controlled to prevent drying and produced water condensation on the surface of a solid electrolyte film. |
