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Numerical investigation of heat transfer characteristics in utility boilers of oxy-coal combustion

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  • Hu, Yukun
  • Li, Hailong
  • Yan, Jinyue

Abstract

Oxy-coal combustion has different flue gas composition from the conventional air-coal combustion. The different composition further results in different properties, such as the absorption coefficient, emissivity, and density, which can directly affect the heat transfer in both radiation and convection zones of utility boilers. This paper numerically studied a utility boiler of oxy-coal combustion and compares with air-coal combustion in terms of flame profile and heat transferred through boiler side walls in order to understand the effects of different operating conditions on oxy-coal boiler retrofitting and design. Based on the results, it was found that around 33vol% of effective O2 concentration ([O2]effective) the highest flame temperature and total heat transferred through boiler side walls in the oxy-coal combustion case match to those in the air-coal combustion case most; therefore, the 33vol% of [O2]effective could result in the minimal change for the oxy-coal combustion retrofitting of the existing boiler. In addition, the increase of the moisture content in the flue gas has little impact on the flame temperature, but results in a higher surface incident radiation on boiler side walls. The area of heat exchangers in the boiler was also investigated regarding retrofitting. If boiler operates under a higher [O2]effective, to rebalance the load of each heat exchanger in the boiler, the feed water temperature after economizer can be reduced or part of superheating surfaces can be moved into the radiation zone to replace part of the evaporators.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:130:y:2014:i:c:p:543-551
    DOI: 10.1016/j.apenergy.2014.03.038
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    References listed on IDEAS

    as
    1. 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.
    2. Hu, Yukun & Yan, Jinyue & Li, Hailong, 2012. "Effects of flue gas recycle on oxy-coal power generation systems," Applied Energy, Elsevier, vol. 97(C), pages 255-263.
    3. Álvarez, L. & Gharebaghi, M. & Jones, J.M. & Pourkashanian, M. & Williams, A. & Riaza, J. & Pevida, C. & Pis, J.J. & Rubiera, F., 2013. "CFD modeling of oxy-coal combustion: Prediction of burnout, volatile and NO precursors release," Applied Energy, Elsevier, vol. 104(C), pages 653-665.
    4. Hu, Yukun & Yan, Jinyue, 2012. "Characterization of flue gas in oxy-coal combustion processes for CO2 capture," Applied Energy, Elsevier, vol. 90(1), pages 113-121.
    5. Li, H. & Yan, J. & Yan, J. & Anheden, M., 2009. "Impurity impacts on the purification process in oxy-fuel combustion based CO2 capture and storage system," Applied Energy, Elsevier, vol. 86(2), pages 202-213, February.
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