| 摘要 |
The operating condition is set so that a phosphoric acid concentration, at which an amount of reaction product water to lower a concentration of phosphoric acid and an amount of water evaporated from phosphoric acid are equilibrated, can be not less than a reference phosphoric acid concentration to maintain desired performance, when a phosphoric acid fuel cell 10 is operated under a condition where the reaction product water exists as liquid water. Specifically, an equilibrium phosphoric acid concentration-setting system 92 is used to control, if necessary, gas flow rate control systems 84, 84a, gas temperature control systems 86, 86a, and pressure control systems 90, 90a so as to effectively prevent the performance of the phosphoric acid fuel cell 10 and its power generation from being worsened. Accordingly, it is possible to suitably operate the phosphoric acid fuel cell 10 at a low temperature without additional equipments. <IMAGE> |
