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Effects of gas and particle emissions on wall radiative heat flux in oxy-fuel combustion

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Abstract

Oxy-fuel combustion exhibits combustion and heat transfer characteristics different from air-fuel combustion due to high concentrations of CO2 and H2O. This study evaluated the effect of gas and particle emissions on radiative heat transfer in oxy-fuel combustion of coal. For a hexahedral furnace, prescribed gas compositions based on combustion calculation were used to simplify the combustion reactions. The values of radiative heat fluxes (qrad) were compared for different combustion modes, flue gas recirculation (FGR) methods, particle concentrations, furnace sizes and O2 concentrations in the oxidizer. The radiation was calculated by the discrete ordinate method with gaseous emission predicted by the weighted sum of gray gases models (WSGGMs). The results showed that employing an optimized WSGGM is essential for the accurate prediction of qrad in oxy-fuel combustion for gaseous fuels. The conventional WSGGM showed large errors for larger furnace volumes or under dry FGR conditions. With higher particle concentrations such as in pulverized coal combustion, however, qrad was dominated by emission of particles. The effect of gas emissivity was not critical in the furnace with a mean beam length of 8.3m. Oxy-fuel combustion with wet FGR had higher qrad than dry FGR. The O2 concentration in the oxidizer was a key parameter for oxy-fuel combustion since increasing its value linearly increased qrad.

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, Suwon, 440-746, Korea

    Sanghyun Park, Jungeun A. Kim & Changkook Ryu

  2. Energy System R&D Group, Korea Institute of Industrial Technology, Cheonan, 330-825, Korea

    Won Yang

  3. Green Energy Lab. Korea Electric Power Research Institute, Daejeon, 305-380, Korea

    Young Ju Kim & Sangil Seo

Authors
  1. Sanghyun Park
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  2. Jungeun A. Kim
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  3. Changkook Ryu
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  4. Won Yang
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  5. Young Ju Kim
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  6. Sangil Seo
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Correspondence to Changkook Ryu.

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Recommended by Associate Editor Oh Chae Kwon.

Changkook Ryu is an associate professor in School of Mechanical Engineering at Sungkyunkwan University, Korea. He received his Ph.D degree on Mechanical Engineering at Korea Advanced Institute of Science and Technology (KAIST), in 2001. He was a research associate in Department of Chemical and Process Engineering at University of Sheffield, UK from 2002 to 2007. His research interests include energy conversion of biomass, coal and other fuels by combustion, gasification and pyrolysis.

Sanghyun Park received his B.S degree on Mechanical Engineering at Sungkyunkwan University, Korea. He is currently M.S. candidate in SKKU, Korea. His research interests are oxyfuel combustion for CCS and pulverized coal combustion.

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Park, S., Kim, J.A., Ryu, C. et al. Effects of gas and particle emissions on wall radiative heat flux in oxy-fuel combustion. J Mech Sci Technol 26, 1633–1641 (2012). https://doi.org/10.1007/s12206-012-0324-8

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  • DOI: https://doi.org/10.1007/s12206-012-0324-8

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