Exergy analysis of gas turbine with air bottoming cycle

• Published in: Energy (Oxford) Vol. 72; pp. 599 - 607
• Main Authors: Ghazikhani, M., Khazaee, I., Abdekhodaie, E.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.08.2014; Elsevier
• Subjects: Air bottoming cycle; Applied sciences; Computer simulation; Destruction; Energy; Energy. Thermal use of fuels; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Exergy; Exhaust; Fuels; Gas turbine; Gas turbines; Mathematical models; Pressure ratio; Specific fuel consumption; Specific work; Specific work; Gas turbine; Exergy; Specific fuel consumption; Air bottoming cycle; Energy analysis; Exergy analysis
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2014.05.085

In this paper, the exergy analysis of a conventional gas turbine and a gas turbine with air bottoming cycle (ABC) is presented in order to study the important parameters involved in improving the performance characteristics of the ABC based on the Second Law of thermodynamics. In this study, work output, specific fuel consumption (SFC) and the exergy destruction of the components are investigated using a computer model. The variations of the ABC cycle exergy parameters are comprehensively discussed and compared with those of the simple gas turbine. The results indicate that the amount of the exhaust exergy recovery in different operating conditions varies between 8.6 and 14.1% of the fuel exergy, while the exergy destruction due to the extra components in the ABC makes up only 4.7–7.4% of the fuel exergy. This is the reason why the SFC of the ABC is averagely 13.3% less and the specific work 15.4% more than those of the simple gas turbine. The results also reveal that in the ABC cycle, at a small value of pressure ratio, a higher specific work with lower SFC can be achieved in comparison with those of the simple gas turbine. •Exhaust exergy recovery in ABC gas turbine varies with 8.6–14.1% of the fuel exergy.•Irreversibility of the extra devices in ABC makes up 4.7–7.4% of the fuel exergy.•SFC in ABC is poor due to exergy recovery more than extra devices irreversibility.•At the same TIT and Rc, specific work in the ABC is more than simple gas turbine.•The recuperator has the largest contribution in the irreversibility of the ABC.