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A numerical study of air preheater leakage

Author

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  • Maharaj, Avinash
  • Schmitz, Walter
  • Naidoo, Reshendren

Abstract

The purpose of the research is to quantify direct leakage for a Ljungström air preheater. The leak flow path was assumed to be similar to flow through an orifice and a theoretical approach was used to calculate leakage. A 2D CFD model with a geometry similar to the one considered in the theoretical approach was also developed to calculate leakage. It was noted that for the different leak gaps investigated, the theoretical calculated leakage was always lower than the CFD calculated leakage. This can be attributed to the fact that the leak gap geometry and actual orifice flow geometry are not identical. Using the 2D CFD model, the leak flow was quantified for various seal settings across the operating air temperature range.

Suggested Citation

  • Maharaj, Avinash & Schmitz, Walter & Naidoo, Reshendren, 2015. "A numerical study of air preheater leakage," Energy, Elsevier, vol. 92(P1), pages 87-99.
    • Handle: RePEc:eee:energy:v:92:y:2015:i:p1:p:87-99
    DOI: 10.1016/j.energy.2015.06.069
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    Citations

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    Cited by:

    1. Young Mun Lee & Heeyoon Chung & Seon Ho Kim & Hyeng Sub Bae & Hyung Hee Cho, 2017. "Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model," Energies, MDPI, vol. 10(12), pages 1-19, November.
    2. Chen, Heng & Qi, Zhen & Dai, Lihao & Li, Bin & Xu, Gang & Yang, Yongping, 2020. "Performance evaluation of a new conceptual combustion air preheating system in a 1000 MW coal-fueled power plant," Energy, Elsevier, vol. 193(C).
    3. Chen, Heng & Wu, Yunyun & Qi, Zhen & Chen, Qiao & Xu, Gang & Yang, Yongping & Liu, Wenyi, 2019. "Improved combustion air preheating design using multiple heat sources incorporating bypass flue in large-scale coal-fired power unit," Energy, Elsevier, vol. 169(C), pages 527-541.
    4. Qi, Yingxia & Meng, Xiangqi & Mu, Defu & Sun, Yangliu & Zhang, Hua, 2016. "Study on mechanism and factors affecting the gas leakage through clearance seal at nano-level by molecular dynamics method," Energy, Elsevier, vol. 102(C), pages 252-259.

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