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Heat Recovery Steam Generator (HRSG)

 
 

The exhaust gases from the gas turbine have a temperature of 600°C and still contain a large amount of energy. That energy is used in the HRSG for steam production at different pressure levels.

The steam is then sent to the steam turbine for additional electricity production.

 
 

Gas Turbine

 
 

The gas turbine of the CCGT is fuelled by natural gas (or by syngas in case the CCGT is integrated with a Gasification Plant to operate as an IGCC).

The gas turbine drives a generator producing electricity for the high voltage transmission grid. The exhaust gases from the gas turbine are sent to the heat recovery steam generator, which recovers the heat present in the exhaust gas for steam production.

 
 

Steam Turbine

 
 

The steam from the HRSG is expanded in a steam turbine which drives the same generator as the gas turbine: gas turbine, steam turbine and generator share the same shaft.

The expanded steam from the steam turbine is condensed in a condenser which is in turn cooled by cooling water. The condensate is used again and sent back to the HRSG.

 
   
  Air emissions
       
  N2   70%vol
  H20   16%vol
  O2   12%vol
  CO2    1%vol
  NOx   < 50 mg/Nm³
  SOx   < 1 mg/Nm³
       
  (%vol = percent by volume)
       
   
  Composition Air
   
  O2 21%vol
  N2 78%vol
  Ar, CO2 etc  1%vol
   
  (%vol = percent by volume)
 
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