Exergetic and economic evaluation of a novel integrated system for cogeneration of power and freshwater using waste heat recovery of natural gas combined cycle
Cong Tian,
Chang Su,
Chao Yang,
Xiwen Wei,
Peng Pang and
Jianguo Xu
Energy, 2023, vol. 264, issue C
Abstract:
This paper proposes cogeneration of power and freshwater using an organic Rankine cycle and freshwater using a multi-stage flash desalination through the waste heat recovery of natural gas combined cycle. Aspen HYSYS and PRSV thermodynamic equations are employed to simulate the integrated structure. Exergy analysis showed that the total efficiency of the proposed scheme is 74%, and the energy efficiency of the power generation cycle, which uses R-141 b as the working fluid, is 12.49%. It is also demonstrated that the exergy efficiency of the power production and desalination units is 86.18% and 55.28%, respectively. The parametric study suggested that sending a larger part of the heat source to the ORC cycle is better. Hence, the total used exergy and, eventually, the total exergy efficiency of the system increase. The proposed scheme's simulation results illustrated that using the flue gas as the feed with a flow rate of 50,000 kg/h with a temperature of 150 °C, 892.4 MWh of electricity, and 6656.8 m3 of freshwater can be produced annually. The economic evaluation showed the total annualized cost of the proposed scheme is 1559491.11 $ with a return on investment of 598833.11 $/year.
Keywords: Flue gas waste heat recovery; Exergy analysis; Economic analysis; Power and freshwater generation; Desalination (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (4)
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:264:y:2023:i:c:s0360544222031139
DOI: 10.1016/j.energy.2022.126227
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