EXERGETIC ANALYSIS OF A WET AIR TURBINE
Alvimar Pereira Pinto1; Felipe Raul Ponce Arrieta1; Mário Antonio Gonçalves Ferreira1; Renato Abreu da Rocha1
1 Pontifical Catholic University of Minas Gerais
doi:10.20906/CPS/COB-2015-0640
Resumo
The exergetic analysis of a wet air turbine aims to calculate the unit exergetic cost of the produced power in design and off-design operating conditions. The thermal schematic of the cycle was simulated in the Gate Cycle software. The design operating condition was defined at ISO reference conditions. The turbine inlet temperature and compressor pressure ratio were studied to find the maximum performance at practical values. From the Gate Cycle mass, energy and entropy balances results the specific and total exergy were calculated. The Fuel-Product definition was applied to compute the irreversibility, the unit exergetic consumption and the exergetic efficiency of the cycle. The productive structure of the thermal cycle was defined to calculate the unit exergetic cost of the produced power. The off-design Gate Cycle model and parametric studies were preformed to study the performance due to ambient conditions variation. The maximum performance in a practical value of turbine inlet temperature was at 1473,15 K and a pressure ratio of 10, for a net power around 25 MW. In this conditions the thermal and exergetic efficiency were 51,78% and 50,51% respectively. In off-design ambient conditions parametric studies shown that the wet air turbine has relatively low influence on performance.
Palavras-chave: Wet air turbine; Gas turbine; Exergy analysis; Thermal schematic simulation