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Energies 2012, 5(8), 2745-2758; doi:10.3390/en5082745

Article

Exergy Analysis of Overspray Process in Gas Turbine Systems

Kyoung Hoon Kim ¹ and Kyoungjin Kim ^2,*

¹ Department of Mechanical Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 730-701, Korea ² Department of Mechanical System Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk 730-701, Korea

* Author to whom correspondence should be addressed.

Received: 2 May 2012; in revised form: 11 July 2012 / Accepted: 11 July 2012 / Published: 30 July 2012

(This article belongs to the Special Issue Exergy Analysis of Energy Systems)

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Abstract: Gas turbine power can be augmented by overspray process which consists of inlet fogging and wet compression. In this study exergy analysis of the overspray process in gas turbine system is carried out with a non-equilibrium analytical modeling based on droplet evaporation and the second law of thermodynamics. This work focuses on the effects of system parameters such as pressure ratio, water injection ratio, and initial droplet diameter on exergetical performances including irreversibility and exergy efficiency of the process. The process performances are also estimated under the condition of saturated water injection ratio above which complete evaporation of injected water droplets within a compressor is not possible. The results show that the irreversibility increases but the saturated irreversibility decreases with increasing initial droplet diameter for a specified pressure ratio.

Keywords: water injection; droplet evaporation; overspray; gas turbine; exergy

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