Title: Exergy analysis of a gas-turbine cycle with fogging inlet cooling

Authors: Hassan Athari; Saeed Soltani; Seyed Mohammad Seyed Mahmoudi; Marc A. Rosen; Tatiana Morosuk

Addresses: Department of Mechanical Engineering, University of Ataturk, Erzurum 25240, Turkey ' Faculty of Mechanical Engineering, University of Tabriz, Iran ' Faculty of Mechanical Engineering, University of Tabriz, Iran ' Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada ' Institute for Energy Engineering, Technische Universität Berlin, Marchstr 18, 10587 Berlin, Germany

Abstract: The objective of this paper is to assist efforts to improve the power plant performance by utilising fogging for inlet cooling of gas turbine cycles and steam injection method through what is known as the FSTIG (gas-turbine cycle with steam injection and simultaneous fog cooling) cycle. The results show that a gas-turbine cycle with steam injection and simultaneous cooling is more advantageous than the other cycles considered in term of power output. Also, the steam injection cycle without fogging cooling (STIG) has better performance than others in term of exergy efficiency at maximum outlet power condition. Furthermore, the exergy destructions of all components in the FSTIG cycle are analysed and the largest irreversibility rate in the cycle is observed for the combustion chamber. The energy and exergy efficiencies of the gas-turbine system with fog cooling and steam injection is maximised at particular values of compressor pressure ratio.

Keywords: gas turbine cycles; fogging inlet cooling; steam injection; exergy analysis; fog cooling; exergy efficiency; exergy destruction; irreversibility rate; compressor pressure ratio.

DOI: 10.1504/IJEX.2015.072062

International Journal of Exergy, 2015 Vol.18 No.1, pp.104 - 127

Available online: 29 Sep 2015 *

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