초록 ▼

To improve the thermal efficiency when an exhaust heat recovery type combined cycle plant having a gas turbine and a steam turbine in combination is operated at a partial load, the gas turbine exhaust is recirculated and returned to the compressor, and the combustion temperature is prevented from be

To improve the thermal efficiency when an exhaust heat recovery type combined cycle plant having a gas turbine and a steam turbine in combination is operated at a partial load, the gas turbine exhaust is recirculated and returned to the compressor, and the combustion temperature is prevented from being lowered at the partial load. Preferably, the temperature is maintained constant. In this way, the thermal efficiency during operation at partial load can be improved.

대표청구항 ▼

[What is claimed is:] [1.]means for deriving an initial exhaust gas recirculation rate signal from a received load demand signal;means for comparing the load demand signal with a load signal to generate a fuel amount target signal;means for comparing the fuel amount target signal with a fuel flow ra

[What is claimed is:] [1.]means for deriving an initial exhaust gas recirculation rate signal from a received load demand signal;means for comparing the load demand signal with a load signal to generate a fuel amount target signal;means for comparing the fuel amount target signal with a fuel flow rate signal and correcting in dependence on a determined combustion temperature determined on the basis of a temperature of the gas turbine exhaust gas and an outlet pressure of the compressor to determine the fuel amount to be charged into the combustor; andmeans for correcting the initial exhaust gas recirculation rate signal in dependence on the determined combustion temperature to derive a recirculation rate control signal.