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Exergy analysis of a gas-turbine combined-cycle power plant with precombustion CO2 capture

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  • Ertesvåg, Ivar S.
  • Kvamsdal, Hanne M.
  • Bolland, Olav

Abstract

A concept for natural-gas (NG) fired power plants with CO2 capture was investigated using exergy analysis. NG was reformed in an auto-thermal reformer (ATR), and the CO2 was separated before the hydrogen-rich fuel was used in a conventional combined-cycle (CC) process. The main purpose of the study was to investigate the integration of the reforming process and the combined cycle. A corresponding conventional CC power plant with no CO2 capture was simulated for comparison. A base case with CO2 capture was specified with turbine-inlet temperature (TIT) of 1250 °C and an air-compressor outlet pressure of 15.6 bar. In this case, the net electric-power production was 48.9% of the lower heating value (LHV) of the NG or 46.9% of its chemical exergy. The captured and compressed CO2 (200 bar) represented 3.1% of the NG chemical exergy, while the NG, due to its pressure (50 bar), had a physical exergy equal to 1.0% of its chemical exergy. The effects of the changed NG composition and environmental temperature were investigated. Higher pressure in the gas turbine and reformer increased the combustion in the ATR and reduced the overall efficiency. Supplementary firing (SF) was investigated as an alternative means of heating the ATR. This also reduced the efficiency. Heating the feeds of the ATR with its product stream was shown to reduce the irreversibility and improve the efficiency of the plant. Both this, and the effect of increased TIT to 1450 °C were investigated. Combining both measures, the net electric-power production was increased to 53.3% of the NG LHV or 51.1% of the NG chemical exergy. On the other hand, both increased TIT and the ATR product-feed heat exchange reduced the conversion of hydrocarbons to CO2.

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  • Ertesvåg, Ivar S. & Kvamsdal, Hanne M. & Bolland, Olav, 2005. "Exergy analysis of a gas-turbine combined-cycle power plant with precombustion CO2 capture," Energy, Elsevier, vol. 30(1), pages 5-39.
    • Handle: RePEc:eee:energy:v:30:y:2005:i:1:p:5-39
    DOI: 10.1016/j.energy.2004.05.029
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    1. Shareq Mohd Nazir & Olav Bolland & Shahriar Amini, 2018. "Analysis of Combined Cycle Power Plants with Chemical Looping Reforming of Natural Gas and Pre-Combustion CO 2 Capture," Energies, MDPI, vol. 11(1), pages 1-13, January.
    2. Kvamsdal, Hanne M. & Jordal, Kristin & Bolland, Olav, 2007. "A quantitative comparison of gas turbine cycles with CO2 capture," Energy, Elsevier, vol. 32(1), pages 10-24.
    3. Coskun, C. & Oktay, Z. & Ilten, N., 2009. "A new approach for simplifying the calculation of flue gas specific heat and specific exergy value depending on fuel composition," Energy, Elsevier, vol. 34(11), pages 1898-1902.
    4. Lee, Young Duk & Ahn, Kook Young & Morosuk, Tatiana & Tsatsaronis, George, 2018. "Exergetic and exergoeconomic evaluation of an SOFC-Engine hybrid power generation system," Energy, Elsevier, vol. 145(C), pages 810-822.
    5. Marcello De Falco & Gianluca Natrella & Mauro Capocelli & Paulina Popielak & Marcelina Sołtysik & Dariusz Wawrzyńczak & Izabela Majchrzak-Kucęba, 2022. "Exergetic Analysis of DME Synthesis from CO 2 and Renewable Hydrogen," Energies, MDPI, vol. 15(10), pages 1-20, May.
    6. Paweł Ziółkowski & Stanisław Głuch & Piotr Józef Ziółkowski & Janusz Badur, 2022. "Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture," Energies, MDPI, vol. 15(7), pages 1-39, April.
    7. Li, Yuanyuan & Zhang, Na & Cai, Ruixian, 2013. "Low CO2-emissions hybrid solar combined-cycle power system with methane membrane reforming," Energy, Elsevier, vol. 58(C), pages 36-44.
    8. Zanchini, Enzo & Terlizzese, Tiziano, 2009. "Molar exergy and flow exergy of pure chemical fuels," Energy, Elsevier, vol. 34(9), pages 1246-1259.
    9. Xu, Zhen & Lu, Yuan & Wang, Bo & Zhao, Lifeng & Xiao, Yunhan, 2021. "Experimental study on the off-design performances of a micro humid air turbine cycle: Thermodynamics, emissions and heat exchange," Energy, Elsevier, vol. 219(C).
    10. Fu, Chao & Gundersen, Truls, 2012. "Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes," Energy, Elsevier, vol. 44(1), pages 60-68.
    11. Kaushik, S.C. & Reddy, V. Siva & Tyagi, S.K., 2011. "Energy and exergy analyses of thermal power plants: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(4), pages 1857-1872, May.
    12. Ertesvåg, Ivar S. & Madejski, Paweł & Ziółkowski, Paweł & Mikielewicz, Dariusz, 2023. "Exergy analysis of a negative CO2 emission gas power plant based on water oxy-combustion of syngas from sewage sludge gasification and CCS," Energy, Elsevier, vol. 278(C).
    13. Ligang Wang & Zhiping Yang & Shivom Sharma & Alberto Mian & Tzu-En Lin & George Tsatsaronis & François Maréchal & Yongping Yang, 2018. "A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants," Energies, MDPI, vol. 12(1), pages 1-53, December.
    14. Ziółkowski, Paweł & Stasiak, Kamil & Amiri, Milad & Mikielewicz, Dariusz, 2023. "Negative carbon dioxide gas power plant integrated with gasification of sewage sludge," Energy, Elsevier, vol. 262(PB).
    15. Manassaldi, Juan I. & Mussati, Sergio F. & Scenna, Nicolás J., 2011. "Optimal synthesis and design of Heat Recovery Steam Generation (HRSG) via mathematical programming," Energy, Elsevier, vol. 36(1), pages 475-485.
    16. Li, Sheng & Gao, Lin & Zhang, Xiaosong & Lin, Hu & Jin, Hongguang, 2012. "Evaluation of cost reduction potential for a coal based polygeneration system with CO2 capture," Energy, Elsevier, vol. 45(1), pages 101-106.
    17. Maruyama, Shigenao & Deguchi, Koji & Chisaki, Masazumi & Okajima, Junnosuke & Komiya, Atsuki & Shirakashi, Ryo, 2012. "Proposal for a low CO2 emission power generation system utilizing oceanic methane hydrate," Energy, Elsevier, vol. 47(1), pages 340-347.
    18. Franzoni, A. & Magistri, L. & Traverso, A. & Massardo, A.F., 2008. "Thermoeconomic analysis of pressurized hybrid SOFC systems with CO2 separation," Energy, Elsevier, vol. 33(2), pages 311-320.
    19. Liao, Chunhui & Ertesvåg, Ivar S. & Zhao, Jianing, 2013. "Energetic and exergetic efficiencies of coal-fired CHP (combined heat and power) plants used in district heating systems of China," Energy, Elsevier, vol. 57(C), pages 671-681.

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