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Performance evaluation of combined cycle based on reheat gas turbine


Autore: R. Rakhsha, K. Sarabchi

Collana: BT - 34 - Mag 06 - Energy: production, distribution and conservation

The fact that combined gas-steam power plant produce a great number of our electricity calls for increasingly detailed analysis of solutions that enhance plant performance and/or specific power levels. The role of gas turbine in combined cycles has been considerably increased in the last two or three decades. As part of this effort, we have used first law analysis. The one-pressure steam cycle was used in this research. Various methods have been proposed to improve the performance of gas turbine. In this research, a reheat cycle (RC) were investigated and compared with a simple cycle (SC).
Today, to achieve a higher efficiency and capacity in gas turbines, higher turbine inlet temperatures (1300°C and more) are used. Basically, application of such temperatures without turbine blade cooling is impossible. Therefore, of gas turbine without considering the blade cooling in modeling will certainly not lead analysis to valid and correct result.
The main objective of this paper is to study the performance of reheat cycle (RC) under actual conditions and its effect on the efficiency in single pressure combined cycle. The result obtained on the basic of model developed for this research, show that reheating in gas turbine in combined cycle, in the context of realistic study, may lead to satisfactory results in efficiency.

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