To enhance power generation efficiency by realizing multistage of fuel cells.
This compound power plant comprises: an FC generation part 30 having the fuel cells; a GT generation part 40 having a gas turbine 42; a GT exhaust heat recovery part 50 for generating steam; and a steam turbine driven by the steam to perform power generation. In the compound power plant, the fuel cells 31 to 36 are serially arranged in six stages, and between the respective stages, reaction gas heat exchanger 71 to 75 are arranged. Fuel gases F31 to F25 heated by the reaction gas heat exchangers 71 to 75 are supplied to the fuel cells 31 to 35 of the first to fifth stages, and fuel gas passage exhaust gases G11F to G15F discharged from a fuel gas passage of the fuel cells 31 to 35 in an upstream side and air passage exhaust gases G11A to G15A discharged from an air passage of the fuel cells 31 to 35 in the upstream side are respectively cooled by the reaction gas heat exchangers 71 to 75, to supply them to a fuel gas passage and an air passage of the fuel cells 32 to 36 at a downstream side. Combustion of unconverted fuel gas inside a FC exhaust gas G3 exhausted from the fuel cell 36 at sixth stage is performed by a combustor 41.
NOUCHI NOBORU
TSUJI TADASHI
MIYAMOTO HITOSHI
WATABE MASAYA
UECHI HIDEYUKI
