| 摘要 |
PURPOSE:To prevent the crossover, of a fuel cell by detecting the carbon dioxide concentration in a discharge flow passage and controlling the interelectrode differential pressure according to the detected value. CONSTITUTION:In the ordinary operating conditions, chemical reaction takes place on the boundary face between an electrolytic solution matrix 1 and an oxidizing agent electrode 2a and on the boundary face between said electrolytic solution matrix 1 and a fuel electrode 2b, therefore carbon dioxide can not be discharged from a fuel flow passage 4b into the oxidizing agent-exhaust passage 10 through the electrolytic solution matrix 1. However, when the interelectrode differential pressure increases and the crossover takes place, the carbon in the oxidizing agent electrode 2a or in the fuel electrode 2b burns, carbon dioxide is resultantly generated and discharged into the oxidizing agent flow passage 4a or the fuel flow passage 4b. Then a carbon dioxide concentration meter 18 detects the carbon dioxide amount in this flow passage and operates so as to amend the set value of the differential pressure in the differential pressure control device 14 through a transducer 14. In this way, when the differential pressure between the fuel gas in the fuel flow passage and inert gas 8 in a container 5 is changed, the interelectrode differential pressure between the oxidizing agent electrode 2a and the fuel electrode 2b is changed according to the above differential pressure. |
