Performance Evaluation of Gas-Steam Combined Cycle Having Transpiration Cooled Gas Turbine
DOI:
https://doi.org/10.13052/dgaej2156-3306.2823Keywords:
Combined cycle, temperature inlet temperatures, transpira- tion cooling, dual pressure HRSG, performance analysisAbstract
In recent years improved gas turbine performance through
developments in high temperature materials and blade cooling methods
has made a positive impact on the combined cycle performance.
Transpiration cooling technique has emerged as the most promising
technique to improve the gas turbine cycle performance by allowing
higher turbine inlet temperatures. This paper concentrates on improving
the combined cycle performance by allowing higher turbine inlet
temperatures (TIT) using transpiration cooling of gas turbine blades. A
four-stage advanced gas turbine coupled with the dual pressure steam
bottoming cycle is considered for the performance of combined cycle.
Realistic input parameters used in current industrial practice have
been considered for this study. The effects of variation of TIT on the
performances of topping, bottoming and combined cycle are presented
and discussed. For the combined cycle with transpiration cooled gas
turbine an increase in TIT from 1600 K to 1800 K exhibits the combined
cycle efficiency increase by 2.37 percent and the combined specific work
increases by 185.42 kJ/kg. The results indicate that at a TIT of 1800 K the
achievable efficiency of combined cycle with transpiration cooled gas
turbine is 59.97 percent.
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