| 摘要 |
PROBLEM TO BE SOLVED: To successfully operate a fuel cell without humidifying the gas at anode and cathode sides. SOLUTION: Calculations are made for the quantity of water Qw, to be generated in a fuel cell 30 based on the output current I of the fuel cell 30 (S102) and for the quantities of saturated water vapor Qwa and Qwc, in the exhaust gas based on the flow rates Qa, Qc, pressures Pa and Pc and temperatures Ta and Tc (S106) of the exhaust, at anode and cathode sides. The water quantity control ratio, t, is defined as t=Qw/(Qwa+Qwc) (S108) and the operation of the fuel cell is controlled by adjusting the flow rates, Qa and Qc, pressures Pa and Pc temperatures Ta and Tc and current I of the exhaust gas at the anode and cathode sides to the direction negating the deviation Δt of the water quantity control ratio t and value 1 (S112). Owing to the above control, the fuel cell can be operated successfully without humidifying the gas at the anode and cathode sides. |
