Starting from the first steam injection cycles (GE-STIG; Cheng), the technique of increasing gas turbine performances by injecting water/steam somewhere before the combustion chamber, shows very interesting results for power and efficiency increase and for NOx emissions. Very interesting performances are achieved by the evaporative cycles, like the HAT (Humid Air Turbine), capable of overcome 50% of conversion efficiency with lower investment costs compared to Combined Cycles. Other advantages of steam injected cycle include the power modulation that is possible realise by varying the steam injected flow rate, keeping the maximum temperature quite constant, and in particular for the HAT cycle it is possible to choose different temperature, pressure and compositions for the blade cooling fluid, depending on the bleed point. In the following, a second low analysis of the HAT cycle and its components, has been done. In particular, the exergetic analysis of blade cooling has been carefully analysed.
Humid air turbine blade cooling exergetic analysis
DI MARIA, Francesco;
1999
Abstract
Starting from the first steam injection cycles (GE-STIG; Cheng), the technique of increasing gas turbine performances by injecting water/steam somewhere before the combustion chamber, shows very interesting results for power and efficiency increase and for NOx emissions. Very interesting performances are achieved by the evaporative cycles, like the HAT (Humid Air Turbine), capable of overcome 50% of conversion efficiency with lower investment costs compared to Combined Cycles. Other advantages of steam injected cycle include the power modulation that is possible realise by varying the steam injected flow rate, keeping the maximum temperature quite constant, and in particular for the HAT cycle it is possible to choose different temperature, pressure and compositions for the blade cooling fluid, depending on the bleed point. In the following, a second low analysis of the HAT cycle and its components, has been done. In particular, the exergetic analysis of blade cooling has been carefully analysed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
