Gas turbine facility

A gas turbine facility, comprising:

• a combustor combusting fuel and oxidant;
• a fuel nozzle attached to the combustor;
• a turbine rotated by a combustion gas exhausted from the combustor;
• a heat exchanger cooling the combustion gas exhausted from the turbine;
• a first combustion gas supply pipe guiding a part of the combustion gas cooled in the heat exchanger to an oxidant supply pipe supplying the oxidant;
• a mixed gas supply pipe passing a mixed gas composed of the oxidant and the combustion gas guided by the first combustion gas supply pipe through the heat exchanger to heat the mixed gas, and guiding the heated mixed gas to the fuel nozzle;
• a second combustion gas supply pipe passing another part of the combustion gas cooled in the heat exchanger through the heat exchanger to heat the another part of the combustion gas, and guiding the heated another part of the combustion gas to the combustor;
• a third combustion gas supply pipe passing still another part of the combustion gas cooled in the heat exchanger through the heat exchanger to heat the still another part of the combustion gas, and guiding the heated still another part of the combustion gas to the fuel nozzle;
• and
• an exhaust pipe exhausting a remaining part of the combustion gas cooled in the heat exchanger to an outside,
• wherein the fuel nozzle includes
• a center flow path jetting the fuel into the combustor;
• a first periphery flow path formed on an outer periphery of the center flow path and jetting the combustion gas guided by the third combustion gas supply pipe into the combustor;
• and
• a second periphery flow path formed on an outer periphery of the first periphery flow path and jetting the mixed gas into the combustor, and
• wherein the oxidant included in the jetted mixed gas and the jetted fuel react in a reaction zone, and the reaction zone is formed in a downstream axial direction of an edge of the first periphery flow path in the combustor.