Assessment of a Real Combined Cycle Power Plant with Supplementary Firing Based on Advanced Exergy/Exergoeconomic Methods

This research performs the advanced exergy and exergoeconomic analyses of a combined cycle power plant (CCPP) located in Zavareh, Iran. The objective of this research is to evaluate the irreversibilities, their related cost rates of each part of the CCPP that can be avoided and the inefficiencies of each part that caused by other components. The advanced exergy and exergoeconomic analyses indicate that the most of the exergy destructions and their related cost rates within the combustion chambers and heat recovery steam generaters (HRSGs) are related to their performance. So, the focus should be on improving the performance of these components themselves, rather than the effects of the remaining components. Results indicate that system’s improvement potential of the overall system and its related cost rate are 14% and 15%, respectively. Also, the improvement potential for the investment flow rate of the system is weak because 75% of them are unavoidable.