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Oxy-coal combustion in an entrained flow reactor: Application of specific char and volatile combustion and radiation models for oxy-firing conditions

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  • Álvarez, L.
  • Yin, C.
  • Riaza, J.
  • Pevida, C.
  • Pis, J.J.
  • Rubiera, F.

Abstract

The deployment of oxy-fuel combustion in utility boilers is one of the major options for CO2 capture. However, combustion under oxy-firing conditions differs from conventional air-firing combustion, e.g., in the aspect of radiative heat transfer, coal conversion and pollutants formation. In this work, a numerical study on pulverised coal combustion was conducted to verify the applicability and accuracy of several sub-models refined for oxy-fuel conditions, e.g., gaseous radiative property model, gas-phase combustion mechanism and heterogeneous char reaction model. The sub-models were implemented in CFD (Computational Fluid Dynamics) simulations of combustion of three coals under air-firing and various oxy-firing (21–35% vol O2 in O2/CO2 mixture) conditions in an EFR (entrained flow reactor). The predicted coal burnouts and gaseous emissions were compared against experimental results. A good agreement between the simulations and experiments was achieved, indicating a good applicability and reliability of the refined sub-models and suitability of use of the experimentally derived kinetic data in coal devolatilisation and char oxidation sub-models. The sub-models and the practices implemented in this work can be used in large-scale oxy-fuel combustion processes for reliable design and optimization.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:62:y:2013:i:c:p:255-268
    DOI: 10.1016/j.energy.2013.08.063
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    References listed on IDEAS

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    1. 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.
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    4. Hashimoto, Nozomu & Shirai, Hiromi, 2014. "Numerical simulation of sub-bituminous coal and bituminous coal mixed combustion employing tabulated-devolatilization-process model," Energy, Elsevier, vol. 71(C), pages 399-413.
    5. Świątkowski, Bartosz & Marek, Ewa, 2015. "Optimisation of pulverized coal combustion in O2/CO2/H2O modified atmosphere – Experimental and numerical study," Energy, Elsevier, vol. 92(P1), pages 47-53.
    6. Yang, Xin & Clements, Alastair & Szuhánszki, János & Huang, Xiaohong & Farias Moguel, Oscar & Li, Jia & Gibbins, Jon & Liu, Zhaohui & Zheng, Chuguang & Ingham, Derek & Ma, Lin & Nimmo, Bill & Pourkash, 2018. "Prediction of the radiative heat transfer in small and large scale oxy-coal furnaces," Applied Energy, Elsevier, vol. 211(C), pages 523-537.
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    9. Hu, Yukun & Li, Hailong & Yan, Jinyue, 2014. "Numerical investigation of heat transfer characteristics in utility boilers of oxy-coal combustion," Applied Energy, Elsevier, vol. 130(C), pages 543-551.

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