Thermodynamic Analysis of a Gas Turbine Power Plant Modelled with an Evaporative Cooler

Year 2014, Volume: 17 Issue: 1, 14 - 20, 01.02.2014

Sunday Oyedepo , Oluwaseun Kilanko

https://doi.org/10.5541/ijot.76988

Cited By: 14

Abstract

Performance of a gas turbine is mainly depends on the inlet air temperature. The power output of a gas turbine depends on the flow of mass through it. Inlet air cooling increases the power output by taking advantage of the gas turbine’s feature of higher mass flow rate when the compressor inlet temperature decreases. This is precisely the reason why on hot days, when air is less dense, power output falls off. A rise of 1°C temperature of inlet air decreases the power output by 1%. In this paper the performance enhancement of gas turbine power plants by cooling the compressor intake air with an evaporative cooler is studied. This study investigated the effect of inlet air cooling system on the performance of an existing gas turbine power plant in Nigeria. The results show that for each 5oC decrease of inlet air temperature, net output power increases around 5-10% and the thermal efficiency increases around 2-5%. It is shown that the amount of this increase is higher when the pressure ratio is high and turbine inlet temperature is low. The results of this study shows that retrofitting of the existing gas turbine plant with inlet air cooling system gives a better system performance and may prove to be an attractive investment opportunity to the Nigeria government and stakeholders of the plant.

Keywords

Gas Turbine (GT), plant performance, relative humidity, dry bulb temperature

References

• F. G. Mahmood, D. D. Mahdi, A New Approach for Enhancing Performance of A Gas Turbine (Case Study: Khangiran Refinery), Appl. Energy, 86, 2750-2759, 200
• Büche, D, Multi-Objective Evolutionary Optimization of Gas Turbine Components, Unpublished (Doctoral Dissertation) Swiss Federal Institute of Technology, Zürich, 2003.
• T. K. Ibrahim, M. M. Rahman, A. N. Abdalla, Study on the effective parameter of gas turbine model with intercooled compression process, Scientific Research and Essays, 5, 3760-3770, 2010.
• Q. M. Jaber, J. O. Jaber, M. A. Khawaldah, Assessment of Power Augmentation from Gas Turbine Power Plants Using Different Inlet Air Cooling Systems, Jordan Journal of Mechanical and Industrial Engineering, 1, 7-15, 2007.
• F. I. Abam, I. U. Ugot and D. I. Igbong, Thermodynamic assessment of grid-based gas turbine power plants in Nigeria, J. Emerg. Trends Eng. Applied Sci., 2, 1026-1033, 2011.
• M. Farzaneh-Gord, M. Deymi-Dashteba, Approach for Enhancing Performance of a Gas Turbine (Case Study: Khangiran Refinery), Applied Energy, 86, 2750-2759, 200
• J. Bird, W. Grabe, Humidity effects on gas turbine performance, ASME Paper No 91-GT-329, 1991.
• A. A. El-Hadik, The impact of atmospheric conditions on gas turbine performance, J Eng Gas Turb Power, 112, 590-596, 1993.
• T. K. Ibrahim, M. M. Rahman, A. N. Abdalla, Improvement of gas turbine performance based on inlet air cooling systems: A technical review, International Journal of Physical Sciences, 6, 620-627, 2011.
• X. Shi, B. Agnew, D. Che, J. Gao, Performance enhancement of conventional combined cycle power plant by inlet air cooling, inter-cooling and LNG cold energy utilization, Applied Thermal Engineering 30, 2003-2010, 2010.
• R. Hosseini, A. Beshkani, M. Soltani, Performance improvement of gas turbines of Fars (Iran) combined cycle power plant by intake air cooling using a media evaporative cooler, Energy Conversion and Management 48, 1055–1064, 2007.
• M. Farzaneh-Gord, M. Deymi-Dashtebayaz, Effect of various inlet air cooling methods on gas turbine performance, Energy, 36, 1196-1205, 2011.
• I. Al-Tobi, Performance Enhancement of Gas Turbines by Inlet Air Cooling, International Conference on Communication, Computer and Power (ICCCP'09) Muscat, February 15-18: 165 – 170, 2009
• F. I. Abam, I. U. Ugot, D. I. Igbong, Performance Analysis and Components Irreversiblities of a (25 MW) Gas Turbine Power Plant Modeled with a Spray Cooler, American J. of Engineering and Applied Sciences 5, 35-41, 2012.
• R. S. Johanson, The Theory and Operation of Evaporative Coolers for Industrial Gas Turbine Installations, Gas Turbine and Aero-engine Congress and Exposition, June 5-9, Amsterdam, The Netherlands, Paper No. 88-GT-41, 1988.
• I. S. Ondryas, D. A. Wilson, M. Kawamoto, G.L. Haub, Options in Gas Turbine Power Augmentation Using Inlet Air Chilling, Engineering for Gas Turbine and Power, Transaction of the ASME, Vol. 113, 203211, 1991.
• T. Johnke, M. Mast, Power boosters—technologies to enhance gas turbine power output on demand, Siemens Power J Online May (2002) www.siemenswestinghouse.com/download/pool/mast_ engl_pdf
• M. Ameri, S. H. Hejazi, The study of capacity enhancement of the Chabahar gas turbine installation using an absorption chiller, Appl. Therm. Eng, 24, 5968, 2004.
• E. Kakaras, S. Doukelis, S. Karellas, Compressor intake-air cooling in gas turbine plants, Energy, 29, 2347-2358, 2004.
• P. Ewa, J. Szymon, M. Andrzej, Impact of inlet air cooling on gas turbine performance, Journal of Power Technologies, 92, 249–257, 2012.
• P. S. Ana Paula, R. A. Claudia, L. S. Edson, Comparison of Different Gas Turbine Inlet Air Cooling Methods, World Academy of Science, Engineering and Technology, 61, 40 -45, 2012.
• H. Kurt, Z. Recebli, E. Gredik, Performance analysis of open cycle gas turbines, International Journal of Energy Research, 33, 285-294, 2009.
• C. Yang, C. Yang, Z and R. Cai, Analytical Method Evaluation of Gas Turbine Inlet Air Cooling in Combined Cycle Power Plant, Applied Energy, 86, 848-856, 2009.
• G. M. Zaki, R. K. Jassim, M. M. Alhazmy, Energy, Exergy and Thermoeconomics Analysis of Water Chiller Cooler for Gas Turbines Intake Air Cooling, Smart Grid and Renewable Energy, 2, 190-205, 2012.
• M. Jonsson, J. Yan, Humidified gas turbines-a review of proposed and implemented cycles, Energy, 30, 10131078, 2005.