| 摘要 |
PURPOSE: To reduce the methanol concentration in fuel gas, and obtain stable output by detecting the methanol concentration in the gas, and setting an operation temperature of a reformer at a prescribed temperature on the temperature side higher than a prescribed temperature when the methanol concentration is not less than an allowable concentration value of a fuel cell. CONSTITUTION: A steady operation condition of a fuel cell system 1 is continued when the methanol concentration C1 is smaller than a prescribed value CS1 being the allowable concentration of methanol of fuel gas. On the other hand, when the concentration C1 is not less than the prescribed value CS1, an operation temperature of a reforming part 16a is raised to a prescribed temperature TK2 on the temperature side higher than a prescribed temperature TK1 in a steady operation condition. When the methanol concentration C1 in the fuel gas is not less than the allowable concentration CS1 of a fiel cell stack 10, an operation temperature of the reforming part 16a is raised, and since decomposing reaction of methanol in the reforming part 16a is promoted, the methanol concentration in the fuel gas can be reduced. Therefore, reduction in output caused when the concentration C1 becomes high can be prevented. |
