| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel cell system that good fuel circulation is ensured in an overall operation range from a light load to a heavy load in a fuel cell so constructed that an offgas containing an excessive fuel from a fuel electrode is circulated on a fuel supply side to efficiently use a fuel, and maintenance is easy. SOLUTION: For the fuel cell system equipped with a circulation passage 8, through which a gas discharged from a fuel electrode of a fuel cell is returned to a fuel supply passage, and an ejector 10 that the gas from the circulation passage is introduced into the fuel supply passage 4, a bypass passage 11 for bypassing the ejector to supply a fuel gas to the fuel electrode and a bypass valve 12 for opening and closing the bypass passage are provided to control the divergence of the bypass valve according to an operating state of the fuel cell. |
