To properly suppress loss of heat energy from a combustor, to promote self-sustainability of heat, and to reduce size and cost.
Both ends of a plurality of oxidant gas pipe conduits 78 are communicated with an oxidant gas supply chamber 76a and an oxidant gas discharge chamber 76b constituting a heat exchanger 50. A combustion chamber 84 defined by a space receiving the plurality of oxidant gas pipe conduits 78 is formed inside of the heat exchanger 50. One end of the oxidant exhaust gas supply pipe 86 and one end of a fuel exhaust gas supply pipe 88 from a side of the oxidant gas discharge chamber 76b are disposed on the combustion chamber 84. A length of the pipe conduit projecting into the combustion chamber 84 at the fuel exhaust gas supply pipe 88a side of the fuel exhaust gas supply pipe 88, is shorter than a length of the pipe conduit projecting into the combustion chamber 84 at the oxidant exhaust gas outlet 86a side of the oxidant exhaust gas supply pipe 86.
Toshiyuki Miyadera
Shuji Ouchi