Advanced Exergoenvironmental Assessment of a Natural Gas-Fired Electricity Generating Facility

Abstract

This paper presents conventional and advanced exergoenvironmental analyses of an electricity genera-tion facility located in the Eskisehir Industry Estate Zone, Turkey. This facility consists of gas turbineand steam cycles, which generate electrical power of approximately 37 MW and 18 MW, respectively.Exergy efficiency of the system is 0.402 and exergy destruction rate of the system is 78.242 MW. Unitexergy cost of electrical power generated by the system is 25.66 $/GJ and total exergoeconomic factorof the system is 0.279. Conventional exergy analysis method was applied to the system first. Next, exergyenvironmental impacts of exergy destruction rate within the facility’s components were divided into fourparts generally, as endogenous, exogenous, avoidable and unavoidable environmental impact of exergydestruction rate. Through this analysis, improvement potential of the environmental impacts of the com-ponents and the overall system and the environmental relations between the components were thendetermined. Finally, exergoenvironmental factor was determined as 0.277 and environmental impactof the electricity was 8.472 (Pts/h). The system has 33% development potential for environmental impactswhile its components have weak relations because of big endogenous parts of environmental impacts(80%). It may be concluded that advanced exergoenvironmental analysis indicated that priority shouldbe given to the GT and CC, while defining the improvement strategies.