Thermodynamics and thermo-economic analysis of simple combined cycle with inlet fogging

Abstract

The present study deals with thermodynamic and thermo-economic analysis of simple combined cycle power plant (CCPP), incorporated with gas turbine (GT) blade cooling by means of bleeding of compressed air, and compressor inlet air cooling by means of fogging. This study has been carried out for five configurations, namely, simple gas turbine combined cycle using single pressure heat recovery steam generator (HRSG), that is, (SGTCC1P), simple gas turbine combined cycle using double pressure HRSG (SGTCC2P), simple gas turbine combined cycle using double pressure HRSG with reheat (SGTCC2PR), simple gas turbine combined cycle using triple pressure HRSG (SGTCC3P) and simple gas turbine combined cycle using triple pressure HRSG with reheat (SGTCC3PR), considering the hot day condition(HDC) at ambient temperature of 40°C and relative humidity of 50%. The thermodynamic analysis has shown that SGTCC3P configuration of simple CCPP incur lowest operating cost per kWh power generation as determined in Fig. 19. This is obvious as evident in the Figs. 5, 6 and 9 of the thermodynamic analysis which show that for a given operating range of GTIT and Cpr, SGTCC3P configuration provides highest specific work and efficiency among all configurations.