Exergy Analysis of Combined Cycle Power Plant: NTPC Dadri, India

Exergy analysis of the combined Brayton/Rankine power cycle of NTPC (National Thermal Power Corporation) Dadri India is presented. Theoretical exergy analysis is carried out for different components of Dadri combined cycle power plant which consists of a gas turbine unit, heat recovery steam generator without extra fuel consumption, and steam turbine unit. The results pinpoint that more exergy losses occurred in the gas turbine combustion chamber reaching 35% of the total exergy losses, while the exergy losses in other plant components are between 7% and 21% of the total exergy losses at 1400 degrees C turbine inlet temperature and pressure ratio 10. This paper also considered the effect of the pressure ratio, turbine inlet temperature, pressure drop in combustion chamber, and heat recovery steam generator on the exergy losses in the plant. There are clear effects in the exergy losses when changing pressure ratio and turbine inlet temperature.