ENERGO-ECONOMICS PAYBACK INVESTMENT CALCULATION MODELLING OF GAS-STEAM COMBINED CYCLE POWER PLANT
Abstract
The paper deals with energo-economic payback calculation modelling of the combined gassteam cycle operation, demonstrating the basic characteristic properties of cycle behaviour in different operating regimes and calculating the payback period of the investment. The calculation of the payback period of the investment is based on the calculation of the net present value and with actual obtaining data sets from a recently built gas-steam combined cycle power plant. The results of the calculation modelling show that the gas-steam combined cycle power plant can achieve a useful efficiency of up to 88% in the back-pressure operation of the steam turbine. The useful efficiency of the gas turbine is up to 40%. The payback period of the investment depends on the investment costs, the quantity and market price of the consumed fuel, the quantity and market price of the generated electricity and thermal energy. The results show that with a price ratio fuel/electricity of 0.36, the payback period of the investment is 4 years, with a price ratio fuel/electricity of 0.54, the payback period of the investment is as much as 17 years.
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References
D. Strušnik, J. Avsec. Exergoeconomic machine-learning method of integrating a thermochemical Cu–Cl cycle in a multigeneration combined cycle gas turbine for hydrogen production. International Journal of Hydrogen Energy 2022; 47: 17121-17149. https://doi.org/10.1016/j.ijhydene.2022.03.230.
B. Li, Y. Deng, Z. Li, J. Xu, H. Wang. Thermal-economy optimization for single/dual/triple-pressure HRSG of gas-steam combined cycle by multi-objective genetic algorithm. Energy Conversion and Management 2022; 258: 115471. https://doi.org/10.1016/j.enconman.2022.115471.
M. L. N. M. Carneiro, M. S. P. Gomes. Energy-ecologic efficiency of waste-to-energy plants. Energy Conversion and Management. 2019; 195: 1359-1370. https://doi.org/10.1016/j.enconman.2019.05.098.
A. Skorek-Osikowska, Ł. Bartela, J. Kotowicz. Thermodynamic and ecological assessment of selected coal-fired power plants integrated with carbon dioxide capture. Applied Energy 2017; 200: 73-88. https://doi.org/10.1016/j.apenergy.2017.05.055.
J. Luz. Silveira, W. Q. Lamas, C. E. Tuna, I. A. C. Villela, L. S. Miro. Ecological efficiency and thermoeconomic analysis of a cogeneration system at a hospital. Renewable and Sustainable Energy Reviews 2012; 16: 2894-2906. https://doi.org/10.1016/j. rser.2012.02.007.
H. Aygun, H. Caliskan. Evaluating and modelling of thermodynamic and environmental parameters of a gas turbine engine and its components. Journal of Cleaner Production 2022; 365: 132762. https://doi.org/10.1016/j.jclepro.2022.132762.
T. Lia, J. Liu, J. Wang, N. Meng, J. Zhu. Combination of two-stage series evaporation with non-isothermal phase change of organic Rankine cycle to enhance flue gas heat recovery from gas turbine. Energy Conversion and Management 2019; 185: 330-338. https://doi.org/10.1016/j.enconman.2019.02.006.
