| 摘要 |
PURPOSE:To completely burn the off-gas from a fuel cell with the exhaust gas by providing a heating device heating the exhaust air with a thermal medium at the initial stage of operation when the off-gas and the exhaust air are fed to a burner from the fuel cell. CONSTITUTION:An auxiliary air preheater 26 storing a heat transfer pipe 25 is provided on an exhaust air feed system 17 downstream an air preheater 3. The exhaust air discharged from a fuel cell 5 and containing moisture is heated by an air preheater 3, however an apparatus and pipes are kept at a low temperature at the initial stage of operation of a fuel cell power generating system, and drain is generated. The exhaust air containing this drain is heated in an auxiliary air preheater 26 by a thermal medium flowing through a thermal medium feed system 27 from a starting circulation system 22 heated by a starting heater 6 to evaporate and remove the drain in the exhaust air. A combustion catalyst is heated to the dew point or above of the off-gas by the high-temperature exhaust air containing no drain, thus the off-gas is completely burned, and no unburnt gas is generated. |
