| 摘要 |
PURPOSE: To establish a high power generating performance stably for a long period of time by accomplishing an operating method for fuel cell which generates such an under-the-cell-surface temp. distribution that the oxidator gas water vapor pressure distribution in an oxidizer gas supply path is in equilibrium with the saturated vapor pressure distribution on a catalyst layer reaction part. CONSTITUTION: A fuel cell of solid high polymer type requires preventing drying and product water condensation in electrochemical reactions on the surface of an electrolyte film, and therefore, humidity management is conducted by generating an apropriate temp. distribution on the cell surface. The under-the- cell-surface optimum temp. distribution to give max. output voltage under the operating conditions including the current density, reaction gas total pressure, inlet air dew point, rate of air utilization, the rate of exhaustion of product water, etc., is established by controlling the under-the-cell-surface upper part temp. and under-the-cell-surface temp. difference between above and below to their optimum values or the neighborhoods. The under-the-cell-surface temp. distribution is controlled by adjusting the temp. of the cooling medium and the rate of flow. |
