Rust prevention method for gas turbine and gas turbine equipment capable of executing same

Gas turbine equipment comprising:

• a gas turbine;
• and
• a dry air system capable of supplying dry air into the gas turbine,
• wherein the gas turbine includes a compressor capable of compressing air to generate compressed air, a combustor capable of combusting fuel in the compressed air to generate a combustion gas, a turbine capable of being driven by the combustion gas, an intake casing, and an intermediate casing,
• the compressor includes a compressor rotor rotatable around an axis, and a compressor casing that covers the compressor rotor,
• the turbine is disposed on an axial downstream side out of an axial upstream side and the axial downstream side in an axial direction in which the axis extends with respect to the compressor,
• the turbine includes a turbine rotor connected to the compressor rotor and rotatable around the axis, and a turbine casing that covers the turbine rotor,
• the intake casing is connected to an end of the compressor casing on the axial upstream side such that air is guided into the compressor casing,
• the intermediate casing is disposed between the compressor casing and the turbine casing in the axial direction, is connected to an end of the compressor casing on the axial downstream side such that the compressed air from the compressor is capable of flowing in, and is connected to an end of the turbine casing on the axial upstream side,
• the combustor is attached to the intermediate casing such that the compressed air in the intermediate casing is capable of flowing into the combustor and the combustion gas is capable of being sent into the turbine casing,
• the combustor includes a burner capable of injecting fuel together with the compressed air, and a transition piece in which the fuel injected from the burner is capable of being combusted in the compressed air, and
• the dry air system includes an air line through which air from an air supply source is capable of flowing, and is configured to supply the air flowing through the air line into the intake casing as the dry air.