Exergy analysis provides useful information for the system optimization. An exergy analysis identifies the sources of thermodynamic inefficiencies by evaluating the exergy destruction within each system component. The present work is an attempt to compare the effect of variations of species concentrations of the combustion process in a simple gas turbine system. Therefore, using a Complete combustion model and an Equilibrium combustion program model, the exergetic evaluation is carried out for a simple gas turbine system with a rated output power of 30 MW. The Complete combustion involves O2, N2, CO2, H2O and Equilibrium combustion model involves N2, O2, CO2, H2O, CO, H2, H, O, OH, N, NO as the species of combustion products. In this work, Equilibrium combustion products were calculated using Olikara and Borman method. Also, a principle of division of chemical availability (exergy) into oxidation availability, reduction availability and diffusion availability has been investigated in these models. Expression involving the variables for exergetic efficiency, exergy destruction, and chemical availability in the components of the gas turbine cycle are derived. The exergy losses and efficiencies of components based on both Complete combustion and Equilibrium combustion models are evaluated. The exergetic efficiencies of the plant based on Complete combustion and Equilibrium combustion are determined to be 28.11% and 28.16%, respectively. It is found that, variation of species has negligible effect on the system main parameters. It is also concluded that chemical exergy in Equilibrium combustion is a little more than that of Complete combustion. Because of additional species involved in Equilibrium combustion, reduction availability and oxidation availability are defined in this modeling beside diffusion availability and it increases chemical exergy of equilibrium combustion modeling. The results obtained here show that in the analysis of the power plant cycles, a simple combustion model (i.e. Complete combustion model) is in good agreement with a complex combustion model considering various species (i.e. Equilibrium combustion model). As a result, there is negligible difference between results of the mentioned combustion models and the simple Complete combustion model facilitates the analysis of such processes.
Skip Nav Destination
ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis
July 12–14, 2010
Istanbul, Turkey
Conference Sponsors:
- International
ISBN:
978-0-7918-4915-6
PROCEEDINGS PAPER
Exergy Analysis of a Simple Gas Turbine System Considering Combustion Process as Complete Combustion and Equilibrium Combustion Available to Purchase
Nayyer Razmara,
Nayyer Razmara
Sahand University of Technology, Tabriz, Iran
Search for other works by this author on:
Rahim Khoshbakhti Saray
Rahim Khoshbakhti Saray
Sahand University of Technology, Tabriz, Iran
Search for other works by this author on:
Nayyer Razmara
Sahand University of Technology, Tabriz, Iran
Rahim Khoshbakhti Saray
Sahand University of Technology, Tabriz, Iran
Paper No:
ESDA2010-24997, pp. 283-288; 6 pages
Published Online:
December 28, 2010
Citation
Razmara, N, & Khoshbakhti Saray, R. "Exergy Analysis of a Simple Gas Turbine System Considering Combustion Process as Complete Combustion and Equilibrium Combustion." Proceedings of the ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 1. Istanbul, Turkey. July 12–14, 2010. pp. 283-288. ASME. https://doi.org/10.1115/ESDA2010-24997
Download citation file:
9
Views
Related Proceedings Papers
Related Articles
Exergy Analysis of Modern Fossil-Fuel Power Plants
J. Eng. Gas Turbines Power (January,2000)
Gas Turbine Cycles With Solid Oxide Fuel Cells—Part I: Improved Gas Turbine Power Plant Efficiency by Use of Recycled Exhaust Gases and Fuel Cell Technology
J. Energy Resour. Technol (December,1994)
Chemical-Looping Combustion for Combined Cycles With CO 2 Capture
J. Eng. Gas Turbines Power (July,2006)
Related Chapters
Introduction
Consensus on Operating Practices for Control of Water and Steam Chemistry in Combined Cycle and Cogeneration
Studies Performed
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies