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 - 12 . (canceled) 
   
   
       13 . A gas turbine unit comprising a compressor to compress and discharge gas, a combustor which the gas compressed by the compressor is fed to, and a turbine to be driven by the combustion gas of the combustor;
 wherein said gas turbine unit has a turbine-cooling system to feed the gas from said compressor to the turbine, said turbine-cooling system comprising a heat exchanger to cool the gas compressed by said compressor and a means to measure the temperature of the gas cooled by the heat exchanger.   
   
   
       14 . A gas turbine unit comprising a compressor to compress and discharge gas, a combustor which the gas compressed by the compressor is fed to, and a turbine to be driven by the combustion gas of the combustor;
 wherein said gas turbine unit has a turbine-cooling system to feed the gas from said compressor to the turbine, said turbine-cooling system comprising a heat exchanger to cool the gas compressed by said compressor, a means to measure the temperature of the gas cooled by the heat exchanger, and a means for controlling the supply of refrigerant to said heat exchanger in accordance with the temperature measured.   
   
   
       15 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor which the gas compressed by the first compressor is fed to, and a turbine to be driven by the combustion gas of 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 comprising a heat exchanger to cool the gas compressed by said first compressor, a means to measure the temperature of the gas cooled by the heat exchanger, a means for controlling the supply of refrigerant to said heat exchanger in accordance with the temperature measured, a liquid-separating means for separating liquid from the gas cooled by the heat exchanger, a first dust-collecting means for separating dust, etc. from the gas having passed through the liquid-separating means, a second compressor to raise the pressure of the gas having passed through the dust-collecting means to a desired level, and a second dust-collecting means for separating dust, etc. from the gas whose pressure has been raised by the second compressor, said second dust-collecting means being at least two filters disposed in parallel in the cooling system of the turbine.   
   
   
       16 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor which the gas compressed by the first compressor is fed to, and a turbine to be driven by the combustion gas of 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 comprising a heat exchanger to cool the gas compressed by said first compressor, a dust-collecting means for separating dust, etc. from the gas cooled by the heat exchanger, and a second compressor to raise the pressure of the gas having passed through the dust-collecting means to a desired level, said dust-collecting means being at least two filters disposed in parallel in the cooling system of the turbine.   
   
   
       17 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor which the gas compressed by the first compressor is fed to, and a turbine to be driven by the combustion gas of 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 comprising a heat exchanger to cool the gas compressed by said first compressor, a dust-collecting means for separating dust, etc. from the gas cooled by the heat exchanger, and a second compressor to raise the pressure of the gas having passed through the dust-collecting means to a desired level, said dust-collecting means being at least two filters disposed in parallel in the cooling system of the turbine, a pressure detector being provided to detect the difference between the pressures before and after the filter, and passage opening-and-closing means being disposed above and below the cooling system of the filter to each control the flow of the air into the filter.   
   
   
       18 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor which the gas compressed by the first compressor is fed to, and a turbine to be driven by the combustion gas of 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 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 the heat exchanger, a first dust-collecting means for separating dust, etc. form the gas having passed through the liquid-separating means, a second compressor to raise the pressure of the gas having passed through the first dust-collecting means to desired level, and a second dust-collecting means for separating dust, etc. from the gas whose pressure has been raised by the second compressor, said first dust-collecting means being at least two filters disposed in parallel in the cooling system of the turbine.   
   
   
       19 - 20 . (canceled) 
   
   
       21 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor which the gas compressed by the first compressor is fed to, and a turbine to be driven by the combustion gas of 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 comprising a heat exchanger to cool the gas compressed by said first compressor, a dust-collecting means for separating dust, etc. from the gas cooled by the 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 separating means for separating liquid and dust, etc. from the gas whose pressure has been raised by the second compressor.   
   
   
       22 . A gas turbine unit comprising a first compressor to compress and discharge gas, a combustor which the gas compressed by the first compressor is fed to, and a turbine to be driven by the combustion gas of 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 comprising a heat exchanger to cool the gas compressed by said first compressor, a dust-collecting means for separating dust, etc. from the gas cooled by the heat exchanger, a separating means for separating liquid and dust, etc. from the gas having passed through said dust-collecting means, and a second compressor to raise the pressure of the gas having passed through the separating means to a desired level.   
   
   
       23 - 27 . (canceled) 
   
   
       28 . A gas-turbine cooling method for a gas turbine unit comprising a compressor to compress and discharge gas, a combustor which the gas compressed by the compressor is fed to, and a turbine to be driven by the combustion gas of the combustor;
 said cooling method includes a first step to cool the gas compressed by said compressor, a second step to separate dust, etc. form the gas cooled, a third step to raise the pressure of the separated gas to a desired level, a fourth step to cool the turbine by feeding the gas whose pressure has been raised to the turbine, and a step, either between said second and third steps or between third and fourth steps, to separate liquid and dust, etc. from the gas.