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Entropy 2017, 19(12), 643; https://doi.org/10.3390/e19120643

Diagnosis of Combined Cycle Power Plant Based on Thermoeconomic Analysis: A Computer Simulation Study

1
Department of Automobiles, Chosun College of Science and Technology, Gwangju 61453, Korea
2
School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Korea
3
Blue Economy Strategy Institute Co. Ltd., Seoul 06721, Korea
*
Author to whom correspondence should be addressed.
Received: 12 September 2017 / Revised: 16 November 2017 / Accepted: 25 November 2017 / Published: 28 November 2017
(This article belongs to the Section Thermodynamics)
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Abstract

In this study, diagnosis of a 300-MW combined cycle power plant under faulty conditions was performed using a thermoeconomic method called modified productive structure analysis. The malfunction and dysfunction, unit cost of irreversibility and lost cost flow rate for each component were calculated for the cases of pre-fixed malfunction and the reference conditions. A commercial simulating software, GateCycleTM (version 6.1.2), was used to estimate the thermodynamic properties under faulty conditions. The relative malfunction (RMF) and the relative difference in the lost cost flow rate between real operation and reference conditions (RDLC) were found to be effective indicators for the identification of faulty components. Simulation results revealed that 0.5% degradation in the isentropic efficiency of air compressor, 2% in gas turbine, 2% in steam turbine and 2% degradation in energy loss in heat exchangers can be identified. Multi-fault scenarios that can be detected by the indicators were also considered. Additional lost exergy due to these types of faulty components, that can be detected by RMF or RDLC, is less than 5% of the exergy lost in the components in the normal condition. View Full-Text
Keywords: thermoeconomic diagnosis; malfunction; power plant; lost cost flow; fault indicator thermoeconomic diagnosis; malfunction; power plant; lost cost flow; fault indicator
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Oh, H.-S.; Lee, Y.; Kwak, H.-Y. Diagnosis of Combined Cycle Power Plant Based on Thermoeconomic Analysis: A Computer Simulation Study. Entropy 2017, 19, 643.

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