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Analysis of oxy-fuel combustion as an alternative to combustion with air in metal reheating furnaces

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  • Oliveira, Flávio A.D.
  • Carvalho, João A.
  • Sobrinho, Pedro M.
  • de Castro, André

Abstract

Using oxygen instead of air in a burning process is at present being widely discussed as an option to reduce CO2 emissions. One of the possibilities is to maintain the combustion reaction at the same energy release level as burning with air, which reduces fuel consumption and the emission rates of CO2. A thermal simulation was made for metal reheating furnaces, which operate at a temperature in the range of 1150–1250 °C, using natural gas with a 5% excess of oxygen, maintaining fixed values for pressure and combustion temperature. The theoretical results show that it is possible to reduce the consumption of fuel, and this reduction depends on the amount of heat that can be recovered during the air pre-heating process. The analysis was further conducted by considering the 2012 costs of natural gas and oxygen in Brazil. The use of oxygen showed to be economically viable for large furnaces that operate with conventional heat recovering systems (those that provide pre-heated air at temperatures near 400 °C).

Suggested Citation

  • Oliveira, Flávio A.D. & Carvalho, João A. & Sobrinho, Pedro M. & de Castro, André, 2014. "Analysis of oxy-fuel combustion as an alternative to combustion with air in metal reheating furnaces," Energy, Elsevier, vol. 78(C), pages 290-297.
    • Handle: RePEc:eee:energy:v:78:y:2014:i:c:p:290-297
    DOI: 10.1016/j.energy.2014.10.010
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    1. Prieler, Rene & Mayr, Bernhard & Demuth, Martin & Spoljaric, Davor & Hochenauer, Christoph, 2015. "Application of the steady flamelet model on a lab-scale and an industrial furnace for different oxygen concentrations," Energy, Elsevier, vol. 91(C), pages 451-464.
    2. Mayr, Bernhard & Prieler, Rene & Demuth, Martin & Hochenauer, Christoph, 2015. "The usability and limits of the steady flamelet approach in oxy-fuel combustions," Energy, Elsevier, vol. 90(P2), pages 1478-1489.
    3. Schmitz, N. & Sankowski, L. & Kaiser, F. & Schwotzer, C. & Echterhof, T. & Pfeifer, H., 2021. "Towards CO2-neutral process heat generation for continuous reheating furnaces in steel hot rolling mills – A case study," Energy, Elsevier, vol. 224(C).
    4. Hu, Yukun & Tan, CK & Niska, John & Chowdhury, Jahedul Islam & Balta-Ozkan, Nazmiye & Varga, Liz & Roach, Paul Alun & Wang, Chunsheng, 2019. "Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives," Energy, Elsevier, vol. 185(C), pages 730-743.
    5. Ehsaniderakhshan, Faeze & Mazaheri, Kiumars & Mahmoudi, Yasser, 2020. "Large eddy simulation on combustion noise in a non-premixed turbulent free flame: Effect of oxygen enhancement," Energy, Elsevier, vol. 210(C).
    6. Hnydiuk-Stefan, Anna & Składzień, Jan, 2017. "Analysis of supercritical coal fired oxy combustion power plant with cryogenic oxygen unit and turbo-compressor," Energy, Elsevier, vol. 128(C), pages 271-283.
    7. Gaber, Christian & Schluckner, Christoph & Wachter, Philipp & Demuth, Martin & Hochenauer, Christoph, 2021. "Experimental study on the influence of the nitrogen concentration in the oxidizer on NOx and CO emissions during the oxy-fuel combustion of natural gas," Energy, Elsevier, vol. 214(C).

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