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Prediction of oxy-coal combustion through an optimized weighted sum of gray gases model

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  • Kangwanpongpan, Tanin
  • Corrêa da Silva, Rodrigo
  • Krautz, Hans Joachim

Abstract

Oxy-fuel combustion is considered as one of promising options for carbon dioxide capture in future coal power plants. Currently models available in CFD codes fail to predict accurately the radiative heat transfer in oxy-fuel cases due to higher pressure of carbon dioxide and water vapor. This paper concerns numerical investigation applying three band formulations aiming an accurate prediction of radiative properties. The radiative heat transfer is calculated by discrete ordinate method coupled with a weighted sum of gray gases model. The first case relates to the domain-based approach using air-fired parameters. In the last two cases, the optimized parameters of 3 and 4 gray gases fitted to oxy-fired conditions are implemented through a non-gray gases approach. Results applying these set of parameters are evaluated through a comparison with experimental data. Discrepancies between the predicted and measured velocity and O2 concentration are found mainly close to the burner due to shortcomings of the turbulence model and inaccurate thermochemical closure. The gas flame temperatures are better predicted by the optimized parameters for oxy-fuel conditions, which are considerably lower than the values calculated by the air-fired parameters. Similar trends are observed when the radiative heat fluxes at the lateral wall are compared.

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  • Kangwanpongpan, Tanin & Corrêa da Silva, Rodrigo & Krautz, Hans Joachim, 2012. "Prediction of oxy-coal combustion through an optimized weighted sum of gray gases model," Energy, Elsevier, vol. 41(1), pages 244-251.
    • Handle: RePEc:eee:energy:v:41:y:2012:i:1:p:244-251
    DOI: 10.1016/j.energy.2011.06.010
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    References listed on IDEAS

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    1. Olajire, Abass A., 2010. "CO2 capture and separation technologies for end-of-pipe applications – A review," Energy, Elsevier, vol. 35(6), pages 2610-2628.
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    3. Pak, Pyong Sik & Lee, Young Duk & Ahn, Kook Young, 2010. "Characteristics and economic evaluation of a power plant applying oxy-fuel combustion to increase power output and decrease CO2 emission," Energy, Elsevier, vol. 35(8), pages 3230-3238.
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    Cited by:

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    2. Álvarez, L. & Yin, C. & Riaza, J. & Pevida, C. & Pis, J.J. & Rubiera, F., 2013. "Oxy-coal combustion in an entrained flow reactor: Application of specific char and volatile combustion and radiation models for oxy-firing conditions," Energy, Elsevier, vol. 62(C), pages 255-268.
    3. Warzecha, Piotr & Boguslawski, Andrzej, 2014. "LES and RANS modeling of pulverized coal combustion in swirl burner for air and oxy-combustion technologies," Energy, Elsevier, vol. 66(C), pages 732-743.
    4. Yin, Chungen & Yan, Jinyue, 2016. "Oxy-fuel combustion of pulverized fuels: Combustion fundamentals and modeling," Applied Energy, Elsevier, vol. 162(C), pages 742-762.
    5. Lawal, Mohammed S. & Fairweather, Michael & Gogolek, Peter & Ingham, Derek B. & Ma, Lin & Pourkashanian, Mohamed & Williams, Alan, 2013. "CFD predictions of wake-stabilised jet flames in a cross-flow," Energy, Elsevier, vol. 53(C), pages 259-269.

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