Gas turbine unit and its cooling method

Abstract

It is the object of the present invention to feed cooling air suitable for cooling the high-temperature part of the gas turbine. The present invention comprises a compressor, a combustor, and a turbine. Further, a turbine-cooling system to feed the gas from the compressor to the turbine is provided, and the turbine-cooling system comprises a heat exchanger to cool the gas compressed by the compressor, and a means for separating liquid from the gas cooled by the heat exchanger. Thus, according to the present invention, it becomes possible to feed cooling air suitable for cooling the high-temperature part of the gas turbine and to achieve higher reliability of the gas turbine unit.

1 - 4 . (canceled)  
   
   
       5 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; 
 wherein said gas turbine unit has a turbine-cooling system to feed gas from said first compressor to the turbine, said turbine-cooling system comprising: a heat exchanger to cool the gas compressed by said first compressor, a liquid-separating means for separating liquid from the gas cooled by said heat exchanger, and a second compressor to raise the pressure of the gas having passed through said liquid-separating means to a desired level.    
   
   
       6 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; 
 wherein said gas turbine unit has a turbine-cooling system to feed gas from said first compressor to the turbine, said turbine-cooling system comprising: a heat exchanger to cool the gas compressed by said first compressor, a dust collecting means for separating dust from the gas cooled by said heat exchanger, and a second compressor to raise the pressure of the gas having passed through said dust-collecting means to a desired level.    
   
   
       7 - 28 . (canceled)  
   
   
       29 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; wherein: 
 said gas turbine unit has a turbine-cooling system to feed the gas from said first compressor to the turbine,    said turbine-cooling system comprises: a heat exchanger to cool gas compressed by said first compressor, a liquid-separating means for separating liquid from the gas cooled by said heat exchanger, and a second compressor to raise the pressure of the gas having passed through said liquid-separating means to a desired level, and    said liquid-separator means is disposed below said heat exchanger and above said second compressor in said turbine-cooling system.    
   
   
       30 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which the gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; wherein: 
 said gas turbine unit has a turbine-cooling system to feed the gas from said first compressor to the turbine,    said turbine-cooling system comprises: a heat exchanger to cool gas compressed by said first compressor, a liquid-separating means for separating liquid from the gas cooled by said heat exchanger, and a second compressor to raise the pressure of the gas having passed through said liquid-separating means to a desired level, and    said heat exchanger, said liquid-separating means and said second compressor are arranged from upstream to downstream in said turbine-cooling system.    
   
   
       31 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which the gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; wherein: 
 said gas turbine unit has a turbine-cooling system to feed gas from said first compressor to the turbine,    said turbine-cooling system comprises: a heat exchanger to cool gas compressed by said first compressor, a dust-collecting means for separating dust from the gas cooled by said heat exchanger, and a second compressor to raise the pressure of the gas having passed through said dust-collecting means to a desired level, and    said dust-collecting means is disposed below said heat exchanger and above said second compressor in said turbine-cooling system.    
   
   
       32 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which the gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; wherein: 
 said gas turbine unit has a turbine-cooling system to feed gas from said first compressor to the turbine,    said turbine-cooling system comprises: a heat exchanger to cool gas compressed by said first compressor, a dust-collecting means for separating dust from the gas cooled by said heat exchanger, and a second compressor to raise the pressure of the gas having passed through said dust-collecting means to a desired level, and    said heat exchanger, said dust-collecting means and said second compressor are arranged from upstream to downstream in said turbine-cooling system.    
   
   
       33 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; 
 wherein said gas turbine unit has a turbine-cooling system to feed gas from said first compressor to the turbine, said turbine-cooling system comprising: a heat exchanger to cool the gas compressed by said first compressor, a liquid-separating means for separating liquid from the gas cooled by said heat exchanger, a second compressor to raise the pressure of the gas having passed through said liquid-separating means to a desired level, and a line to control said gas flow.    
   
   
       34 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor to which gas compressed by the first compressor is fed, and a turbine to be driven by combustion gas from the combustor; 
 wherein said gas turbine unit has a turbine-cooling system to feed gas from said first compressor, a dust-collecting means for separating dust from the gas cooled by said heat exchanger, a second compressor to raise the pressure of the gas having passed through said dust-collecting means to a desired level, and a line to control said gas flow.