A Thermal Analysis and Optimization of a Combined Cycle by Several Technologies

KILANI Nihed^1, , KHIR Tahar¹ and BEN BRAHIM Ammar¹

¹National School of Engineers of Gabes, University of Gabes Omar Ibn El Khattab St, 6029 Gabes, Tunisia,

Cite this paper:
KILANI Nihed, KHIR Tahar and BEN BRAHIM Ammar. A Thermal Analysis and Optimization of a Combined Cycle by Several Technologies. American Journal of Energy Research. 2014; 2(2):35-41. doi: 10.12691/ajer-2-2-3

Abstract

Thermodynamic optimization of four power plant installations with different technology is presented and discussed in this paper. Numerical optimization of the different cycles is performed in aim to obtain higher efficiency. Thermal analysis performance for the fourth cycles is performed for a define range of operating parameters using a calculation code established according to EES software. The first studied cycle is a simple combined cycle containing gas turbine cycle with a steam injection system, one pressure heat recovery steam generator HRSG and a steam turbine cycle. The overall efficiency of this cycle in inlet ambient conditions is about 46%. The second cycle is a combined one with steam injection system for which the steam injected is generated outside the HRSG using heat recovery system at the air compressor outlet. The performance of this cycle in the same initial conditions is higher of about 1%. The third plant is a combined cycle with steam injection and two steam extractions from steam turbine and two open feedwater heaters. The performance of this cycle is higher of about 1% compared to the first one. The last considered power plant technology is a combined cycle with heat recovery at air compressor outlet and steam extraction. Obtained results show that the optimum operating parameters leading to the best performances are not the same for different cycles.

Keywords:
combined cycle steam extraction heat recovery optimization thermal efficiency

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References:

[1]	F. Basrawi, T. Yamada, K. Nakanishi, F. Naing, Effect of ambient temperature on the performance of micro gas turbine with cogeneration system in cold region, Applied Thermal Engineering 31, (2011), 1058-1067.
[2]	J.L. Silveira, J.A. Carvalho, I.A. Villela, Combined cycle versus on thousand diesel power plants: pollutant emission, ecological efficiency and economic analysis, Renewable and Sustainable Energy Reviews 11, (2007), 524-535.
[3]	Y.S.H. Najjar, Efficien use of energy by utilizing gas turbine combined systems, Applied Thermal Engineering 21, (2001), 407-438.
[4]	R. Felipe, P. Arrieta, E. Electo, S. Lora, Influence of ambient emperature on combined-cycle power-plant performance, Applied Energy 80, (2005), 261-272.
[5]	L.O. Nord, O. Bolland, design and off-design simulation of combined cycles for offshore oil and gas installation, Applied Thermal Engineering 54, (2013), 85-91.
[6]	H. Sayyaadi, R. Mehrabipour, Efficiency enhancement of a gas turbine cycle using an optimized tubular recupertive heat exchanger, Energy 38, (2012), 362-375.
[7]	T.K. Ibrahim, M.M. Rahman, A.N. Abdalla, Optimum gas turbine configuration for improving the performance of combined cycle power plant, Procedia Engineering 15, (2011), 4216-4223.
[8]	C. Carcasci, B. Facchini, Comparison between two gas turbine solutions to increase combined power plant efficiency, Energy Conversion & Management 41, (2000) 757-773.
[9]	Y.S.H. Najjar, A.S. Alghamdi, M.H. Al-Beirutty, Comparative performance of combined gas turbine systems under three different blade cooling schemes, Applied Thermal Engineering 24, (2004), 1919-1934.
[10]	A. Bouam, S. Aissani, R. Kadi, Améliorationdes performancesdes turbines à gaz par injection de la vapeur d’eau en amontde la chambre de combustion, Revuedes Energies Renouvelables 11(2), (2008), 291-306.
[11]	W.B. Glover, Selecting evaporator for process application, CEPmagazine, (2004), 26-33.
[12]	M.P. Boyce, Gas turbine engineering handbook, Gulf Professional Publishing, (2002).
[13]	J.H. Horlok, Advanced gas turbine cycles, Elsevier science, (2003).
[14]	R. Kehlhofer, Combined cycle gas and steam turbine power plants, PennWell Company, (1997).
[15]	V. Ganapathy, Heat Recovery Steam Generator: Understand the basics, Chemical Engineering (1996), 32-45.
[16]	T.K. Ibrahim, M.M. Rahman, Effect of compression ratio on performance of combined cycle gas turbine 2(1), (2012), 9-14.