Journal ArticleDOI
Exergy analysis of a 420 MW combined cycle power plant
TLDR
In this article, the authors evaluate irreversibility of each part of Neka CCPP using the exergy analysis and show that the combustion chamber, gas turbine, duct burner and heat recovery steam generator (HRSG) are the main sources of irreversability representing more than 83% of the overall exergy losses.Abstract:
Combined cycle power plants (CCPPs) have an important role in power generation. The objective of this paper is to evaluate irreversibility of each part of Neka CCPP using the exergy analysis. The results show that the combustion chamber, gas turbine, duct burner and heat recovery steam generator (HRSG) are the main sources of irreversibility representing more than 83% of the overall exergy losses. The results show that the greatest exergy loss in the gas turbine occurs in the combustion chamber due to its high irreversibility. As the second major exergy loss is in HRSG, the optimization of HRSG has an important role in reducing the exergy loss of total combined cycle. In this case, LP-SH has the worst heat transfer process.
The first law efficiency and the exergy efficiency of CCPP are calculated. Thermal and exergy efficiencies of Neka CCPP are 47 and 45.5% without duct burner, respectively. The results show that if the duct burner is added to HRSG, these efficiencies are reduced to 46 and 44%. Nevertheless, the results show that the CCPP output power increases by 7.38% when the duct burner is used. Copyright © 2007 John Wiley & Sons, Ltd.read more
Citations
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Journal ArticleDOI
Exergy, exergoeconomic and environmental analyses and evolutionary algorithm based multi-objective optimization of combined cycle power plants
TL;DR: In this article, a comprehensive exergy, exergoeconomic and environmental impact analysis and optimization is reported of several combined cycle power plants (CCPPs), and a multi-objective optimization is performed to determine the best design parameters, accounting for exergetic, economic and environmental factors.
Journal ArticleDOI
Energy, exergy and exergoeconomic analysis of a steam power plant: A case study
TL;DR: In this article, an energy, exergy and exergoeconomic analysis for the Hamedan steam power plant is performed. But the results show that the most significant sources of exergy destruction in the boiler system are due to the combustion reaction and its high temperature.
Journal ArticleDOI
Exergo-environmental analysis of an integrated organic Rankine cycle for trigeneration
TL;DR: In this paper, a trigeneration system consisting of a gas turbine cycle, an organic Rankine cycle (ORC), a single-effect absorption chiller and a domestic water heater is reported.
Journal ArticleDOI
Thermodynamic analysis and thermoeconomic optimization of a dual pressure combined cycle power plant with a supplementary firing unit
Pouria Ahmadi,Ibrahim Dincer +1 more
TL;DR: In this article, a combined cycle power plant (CCPP) with a supplementary firing system is first thermodynamically analyzed through energy and exergy, and the optimal design of operating parameters of the plant is then performed by defining an objective function and applying a generic algorithm (GA) type optimization method.
Journal ArticleDOI
Exergoenvironmental analysis and optimization of a cogeneration plant system using Multimodal Genetic Algorithm (MGA)
Pouria Ahmadi,Ibrahim Dincer +1 more
TL;DR: In this paper, a combined heat and power plant for cogeneration purposes that produces 50MW of electricity and 33.3 kg/s of saturated steam at 13 bar is optimized using genetic algorithm.
References
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Book
Fundamentals of Engineering Thermodynamics
TL;DR: In this article, the authors present an overview of the second law of thermodynamics and its application in the context of a gas turbine power plant and evaluate the entropy of the system.
Book
The Exergy Method of Thermal Plant Analysis
TL;DR: The Exergy Method as mentioned in this paper is a method of thermodynamic analysis in which the basis of evaluation of the thermodynamic losses follows from the Second Law rather than the First Law of Thermodynamics and has gained in the last few years many new followers, both among practising engineers and academics.
Journal ArticleDOI
The role of exergy in energy policy making
TL;DR: In this paper, the utilization of exergy as an efficient tool for energy policy making applications is discussed, since exergy is a measure of quantity and quality of the energy sources unlike energy which is only about the quantity.
Journal ArticleDOI
Energy-exergy analysis and modernization suggestions for a combined-cycle power plant
TL;DR: In this article, energy and exergy analysis were carried out for a combined-cycle power plant by using the data taken from its units in operation to analyse a complex energy system more thoroughly and to identify the potential for improving efficiency of the system.