초록 ▼

A gas turbine includes a compressor and a combustor having a first fuel supply system for supplying a first fuel and a second fuel supply system for supplying a second fuel lower in calorific value than the first fuel and burning compressed air and fuel supplied through switching the first fuel syst

A gas turbine includes a compressor and a combustor having a first fuel supply system for supplying a first fuel and a second fuel supply system for supplying a second fuel lower in calorific value than the first fuel and burning compressed air and fuel supplied through switching the first fuel system and the second fuel system. A turbine is driven by combustion gas supplied from the combustor. An extraction system is provided for extracting part of the compressed air supplied from the compressor to the combustor. Control means are provided for controlling, so as to suppress a pressure change of the compressed air supplied to the combustor, by adjusting an opening of the control valve according to a calorific value of the second fuel when fuel supplied to the combustor is switched from the first fuel to the second fuel lower in calorific value than the first fuel.

대표청구항 ▼

[What is claimed is:] [2.]a first fuel feed line supplying a first fuel from a first fuel supply means to said combustor;an extraction system extracting a part of compressed air supplied from said compressor;a control valve provided on said extraction system;an expander communicating with said extra

[What is claimed is:] [2.]a first fuel feed line supplying a first fuel from a first fuel supply means to said combustor;an extraction system extracting a part of compressed air supplied from said compressor;a control valve provided on said extraction system;an expander communicating with said extraction system and driven by the compressed air supplied therefrom;a first fuel compressor connected to said expander through a shaft for pressurizing a second fuel supplied from a second fuel supply means and having a lower calorific value than the first fuel;a second fuel compressor connected to said turbine through a shaft for further pressurizing the second fuel discharged from said first fuel compressor;a second fuel feed line supplying the second fuel pressurized in said second fuel compressor into said combustor; anda control means for controlling so as to suppress a pressure change of compressed air supplied to said combustor by opening said control valve according to a calorific value of the second fuel to increase a quantity of compressed air extracted from said extraction system and supplied to said expander upon switching of fuel to be supplied into said combustor from the first fuel to the second fuel.