Gas turbine apparatus

A gas turbine apparatus comprising:

• an air compressor for compressing air;
• a combustor capable of combusting the air compressed by said air compressor, said combustor including a fuel manifold;
• a turbine rotatable by a gas discharged from said combustor;
• a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine;
• a first fuel supply device operable to supply a fuel having a large heating value to said combustor;
• a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor;
• and
• a fuel controller operable to adjust amounts of the fuel and the gas to be supplied,
• wherein said fuel controller is configured to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value when it is determined that said recuperator is heated to a predetermined temperature based on the temperature of the air compressed by said air compressor or the exhaust gas discharged from the turbine, and
• wherein said first fuel supply device and said second fuel supply device are coupled separately to said fuel manifold of said combustor.

A gas turbine power generating system comprising:

• a gas turbine apparatus including:
• an air compressor for compressing air,
• a combustor capable of combusting the air compressed by said air compressor,
• a turbine rotatable by a gas discharged from said combustor,
• a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine,
• a first fuel supply device operable to supply a fuel having a large heating value to said combustor,
• a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor, and
• a switching device operable to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value by switching said first fuel supply device and said second fuel supply device, wherein a switching operation of said switching device is performed when it is determined that said recuperator is heated to a predetermined temperature based on a temperature of the air compressed by said air compressor or the exhaust gas discharged from said turbine;
• and
• a power generating apparatus for generating electric power with use of high-speed rotation of said turbine in said gas turbine apparatus.

A gas turbine power generating system comprising:

• a gas turbine apparatus including:
• an air compressor for compressing air,
• a combustor capable of combusting the air compressed by said air compressor, said combustor including a fuel manifold,
• a turbine rotatable by a gas discharged from said combustor,
• a recuperator for exchanging heat between the air supplied from said air compressor to said combustor and an exhaust gas discharged from said turbine,
• a first fuel supply device operable to supply a fuel having a large heating value to said combustor,
• a second fuel supply device operable to supply a gas having a lower heating value smaller than the fuel to said combustor, and
• a fuel controller operable to adjust amounts of the fuel and the gas to be supplied,
• wherein said fuel controller is configured to switch a fuel to be supplied to said combustor from the fuel having a large heating value to the gas having a lower heating value when it is determined that said recuperator is heated to a predetermined temperature based on the temperature of the air compressed by said air compressor or the exhaust gas discharged from the turbine, and wherein said first fuel supply device and said second fuel supply device are coupled separately to said fuel manifold of said combustor;
• and
• a power generating apparatus for generating electric power with use of high-speed rotation of said turbine in said gas turbine apparatus.