(0088) STAGE PERFORMANCE AND OPTIMAL COMPRESSION RATIO OF A SIMPLE-CYCLE GAS TURBINE
Abstract
In the present paper, the performance of a simple-cycle gas turbine was analysed. The first part of the paper focuses on the performance of a gas turbine stage. Assuming the working medium to be an ideal gas, a relation between the current and maximum enthalpy and entropy changes was obtained. Based on this relation, three other relations were obtained: between stage internal efficiency, current and maximum enthalpy and entropy changes, and stage inlet temperature. A relation for stage outlet temperature under changed conditions, taking into account reference conditions, was also proposed. The proposed relations are true when the difference between the inlet and outlet pressures is small, as is the case with the gas turbine stage. In the second part of the paper, determining optimal compression ratio for the whole simple-cycle gas turbine system is described. Most commonly, the optimal compression ratio is assumed for maximum power or thermal efficiency of the whole system. The optimal compression ratio for maximum power is determined analytically, while the one for maximum efficiency iteratively. In the paper, an analytical relation for the optimal compression for maximum thermal efficiency was presented. In order to determine the optimal compression ratio for a simple-cycle gas turbine, the applicability of another function was examined; besides the enthalpy changes for the turbine and compressor, the other function also directly takes into account entropy changes in the turbine and compressor. In the discussion, identical properties of air and flue gas were assumed, pressure losses in the system were neglected, and the air and flue gas mass flow rates were assumed to be equal.References
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[2] Miller A., Lewandowski J., Gas- steam systems on solid fuel (in Polish). WNT Warszawa, 1993.
[3] Badyda K., Miller A., Energy gas turbines and systems with their application (in Polish). Kaprint, 2011.
[4] Chmielniak T., Thermal turbines - theoretical basis (in Polish). WPÅ, 1998.
[5] Staniszewski B., Thermodynamics (in Polish). PWN Warszawa, 1978.
[6] Chmielniak T., Energy technologies (in Polish). WNT Warszawa, 2008.
[7] Perycz S., Steam and gas turbines (in Polish). WPG, 1988.
[8] Staniszewski B., Heat transfer (in Polish). PWN Warszawa, 1979.
[9] Badyda K., Characteristcs of advanced gas turbine cycles (in Polish), Energy Market nr 6/2010.
[10] Haseli Y., Performance of irreversible heat engines at minimum entropy generation, Applied Mathematical Modelling 37 (2013) 9810â9817.
[11] Vitaly A. Prisyazhniuk, The turbine plant efficiency: Maximum efficiency attained and the share of individual stages, Applied Thermal Engineering 28 (2008) 1318â1323.
[12] Ashley De Sa, Sarim Al Zubaidy, Gas turbine performance at varying ambient temperature, Applied Thermal Engineering 31 (2011) 2735-2739.
[13] H.H. Erden, S.H. Sevelgen, Case study: effect of ambient temperature on the electricity production and fuel consumption of a simple cycle gas turbine in Turkey, Applied Thermal Engineering 26 (2-3) (2006) 320-326.
[14] H. Carniere, A. Willocx, E. Dick, M De. Paepe, Raising cycle efficiency by inter cooling in air cooled gas turbine, Applied Thermal Engineering 26 (16) (2006) 1780-1787.
[15] M. Kowalski, K. Badyda, Performance analysis of a gas turbine air heat recovery unit using GateCycle software, Journal of Power Technologies 92 (1) (2012) 48â54.
[16] Kotowicz J., Gas and steam power plants (in Polish), Kaprint, 2008.
[17] Kotowicz J., Thermodynamic and Economic Analysis of the combined cycle gas turbine integrated with coal gasification and carbon dioxide separation membrane (in Polish), Silesian University of Technology 2012.
[18] Laskowski R., Smyk A., Lewandowski J., An attempt to determine the compressor and turbine efficiency based on measurement data (in Polish), Rynek Energii 3/2014, 63-68.
[19] Laskowski R., Smyk A., Lewandowski J., A simplified approach to determining thermodynamic parameters and performance of a single-shaft gas turbine engine in offdesign conditions, Rynek Energii 3(118)/2015, 115-125.
Published
2015-09-20
How to Cite
LASKOWSKI, Rafal Marcin; LEWANDOWSKI, Janusz.
(0088) STAGE PERFORMANCE AND OPTIMAL COMPRESSION RATIO OF A SIMPLE-CYCLE GAS TURBINE.
Journal of Power Technologies, [S.l.], sep. 2015.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/537>. Date accessed: 21 nov. 2024.
Issue
Section
Power Plant
Keywords
efficiency, gas turbine, optimal compression ratio
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