| 摘要 |
PROBLEM TO BE SOLVED: To enable to operate in good condition the phosphoric acid fuel cell in low temperature without using additional equipment. SOLUTION: In operating the phosphoric acid fuel cell 10 under the condition in which the reaction formed water exists in liquid state, the operating condition is established so that the phosphoric acid concentration, in which the quantity of the reaction formed water lowering the phosphoric acid concentration and the quantity of the water vaporizing from the phosphoric acid are equalized, becomes same or higher than the standard phosphoric acid concentration in which it can maintain the desired performance. Specifically, a gas flow control system 84, 84a, a gas temperature control system 86, 86a and a pressure control system 90, 90a are controlled as required by the equalizing phosphoric acid concentration setting system 92, and the performance deterioration and generation performance degradation of the phosphoric acid fuel cell are effectively avoided. |
