The performance of gas-steam combined cycle power plants with multiple expansion reheating gas turbine, are studied considering the influence of the cooling air necessary to the most thermically stressed topper devices. The influence of various maximum quantities of the cooling air have been examined and it has been observed that, in all case, a small range of intermediate pressures exists making combined plant maximum efficiency. Beside it followed that, even considering the most severe conditions for the cooling air, efficiencies are greater (two or three points about) than those of combined plants with Brayton cycle gas turbine. The values of the power ratio between the gas turbine and the steam section are low so that relatively high power combined plants can be realized.
The Cooling Air Influence on the Performance of the Gas-Steam Combined Cycle Power Plants with Multiple Expansion Reheating Gas Turbine / Cantore, Giuseppe; R., Bettocchi; G., Negri di Montenegro; G., Vincenzi. - STAMPA. - 4:(1989), pp. 289-298. (Intervento presentato al convegno ASME Cogen-Turbo tenutosi a Nizza, Francia nel Agosto 1989).
The Cooling Air Influence on the Performance of the Gas-Steam Combined Cycle Power Plants with Multiple Expansion Reheating Gas Turbine
CANTORE, Giuseppe;
1989
Abstract
The performance of gas-steam combined cycle power plants with multiple expansion reheating gas turbine, are studied considering the influence of the cooling air necessary to the most thermically stressed topper devices. The influence of various maximum quantities of the cooling air have been examined and it has been observed that, in all case, a small range of intermediate pressures exists making combined plant maximum efficiency. Beside it followed that, even considering the most severe conditions for the cooling air, efficiencies are greater (two or three points about) than those of combined plants with Brayton cycle gas turbine. The values of the power ratio between the gas turbine and the steam section are low so that relatively high power combined plants can be realized.
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