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Analysis of a repowering proposal to the power generation system of a steel mill plant through the exergetic cost method

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  • Modesto, M.
  • Nebra, S.A.

Abstract

The rational use of energy became a priority for all industries in Brazil after the energetic rationing in 2001. The aim of this work is to assess a proposal of a power generation system for Companhia Siderúrgica Tubarão, a steel mill plant. The current system is based on a regenerative Rankine cycle using two gases from steel production—blast furnace gas (BFG) and coke oven gas (COG)—to generate electric power and occasionally steam for the process. The proposed system is a combined cycle comprising two gas turbines, two heat recovery steam generators (HRSGs), and a steam turbine. The fuel for the gas turbines is BFG, and the supplementary firing of HRSG uses COG. The proposed HRSGs work at three pressure levels. The system was assessed by means of two thermoeconomic methodologies, Theory of Exergetic Cost and Thermoeconomic Functional Analysis; exergetic and monetary costs of power production were calculated and compared to the respective values of the current system.

Suggested Citation

  • Modesto, M. & Nebra, S.A., 2006. "Analysis of a repowering proposal to the power generation system of a steel mill plant through the exergetic cost method," Energy, Elsevier, vol. 31(15), pages 3261-3277.
    • Handle: RePEc:eee:energy:v:31:y:2006:i:15:p:3261-3277
    DOI: 10.1016/j.energy.2006.03.032
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    1. Lozano, M.A. & Valero, A., 1993. "Theory of the exergetic cost," Energy, Elsevier, vol. 18(9), pages 939-960.
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    2. Yılmaz, Kadir & Kayfeci, Muhammet & Keçebaş, Ali, 2019. "Thermodynamic evaluation of a waste gas-fired steam power plant in an iron and steel facility using enhanced exergy analysis," Energy, Elsevier, vol. 169(C), pages 684-695.
    3. Variny, Miroslav & Mierka, Otto, 2009. "Improvement of part load efficiency of a combined cycle power plant provisioning ancillary services," Applied Energy, Elsevier, vol. 86(6), pages 888-894, June.
    4. dos Santos, Rodrigo G. & de Faria, Pedro R. & Santos, José J.C.S. & da Silva, Julio A.M. & Flórez-Orrego, Daniel, 2016. "Thermoeconomic modeling for CO2 allocation in steam and gas turbine cogeneration systems," Energy, Elsevier, vol. 117(P2), pages 590-603.
    5. Hong, Sanghyun & Bradshaw, Corey J.A. & Brook, Barry W., 2013. "Evaluating options for sustainable energy mixes in South Korea using scenario analysis," Energy, Elsevier, vol. 52(C), pages 237-244.
    6. Gürtürk, Mert & Oztop, Hakan F. & Hepbasli, Arif, 2015. "Comparison of exergoeconomic analysis of two different perlite expansion furnaces," Energy, Elsevier, vol. 80(C), pages 589-598.

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