Patent ID: 8820085

Claim:
A lean fuel intake gas turbine system, comprising: a compressor configured to compress a mixture produced by mixing fuel with air and having a concentration equal to or lower than a flammable limit so as to produce a compressed gas; a first catalytic combustor configured to burn the compressed gas by a catalytic oxidation; a turbine configured to be driven with a combustion gas supplied from the first catalytic combustor; a recuperator configured to heat the compressed gas with an exhaust gas discharged from the turbine while the compressed gas is introduced from the compressor into the first catalytic combustor; a duct burner provided between the turbine and the recuperator and configured to burn the exhaust gas with a first auxiliary fuel by flame combustion; a gas mixing passage configured to mix the mixture of the fuel and air into an exhaust gas discharged from the recuperator; a catalytic reactor configured to oxidize a fuel component contained in the exhaust gas mixed with the mixture by a catalytic oxidation; and a heat exchanger configured to heat the mixture flowing through the gas mixing passage with an oxidized exhaust gas discharged from the catalytic is reactor.