Exergy Analysis of Combined Cycle Power Plant (GARRI”2” 180 MW)

Abstract

In recent years the entire world is a warring about energy resources limitation, specifically Sudan country confronts critical crises in fossil fuel resources and yet more of electricity energy producing from fired thermal power plants. One from these plants Garri”2” combined cycle producing about 180MW. Exergy analysis in the light second law of thermodynamics is powerful tools to investigate from optimization of engineering devices. Exergy analysis has been carried out analytically for Garri”2” to evaluate exergetic efficiency and exergy destruction of each part; exergy balance and entropy generation calculated to achieve it .The results showed that combustion chambers are the main sources of exergy destruction due to high irreversibilities representing 63% from total exergy destruction, followed by gas turbines 13.6%, steam turbines 6.4%, heat recovery steam generators(HRSGs) 6.3%, stacks (exhaust gases) 4.7%, compressors 3.8% and cooling systems 2.3%. The results also showed that thermal and exergetic efficiencies for entire plant are (38%, 49%) respectively.