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The Coupling Effect Research of Ash Deposition and Condensation in Low Temperature Flue Gas

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Listed:
  • Lei Ma
  • Feng-zhong Sun
  • Zhi-min Li
  • Pei Chen
  • Fei Li

Abstract

Ash deposition is a key factor that deteriorates the heat transfer performance and leads to higher energy consumption of low pressure economizer working in low temperature flue gas. In order to study the ash deposition of heat exchange tubes in low temperature flue gas, two experiments are carried out with different types of heat exchange tubes in different flue gas environments. In this paper, Nusselt Number Nu and fouling factor ε are calculated to describe the heat transfer characteristics so as to study the ash deposition condition. The scanning electron microscope (SEM) is used for the analysis of ash samples obtained from the outer wall of heat exchange tubes. The dynamic process of ash deposition is studied under different temperatures of outer wall. The results showed that ash deposition of heat exchanger will achieve a stable state in constant flue gas environment. According to the condition of condensation of acid vapor and water vapor, the process of ash deposition can be distinguished as mere ash deposition, acid‐ash coupling deposition, and acid‐water‐ash coupling deposition.

Suggested Citation

  • Lei Ma & Feng-zhong Sun & Zhi-min Li & Pei Chen & Fei Li, 2016. "The Coupling Effect Research of Ash Deposition and Condensation in Low Temperature Flue Gas," Discrete Dynamics in Nature and Society, John Wiley & Sons, vol. 2016(1).
    • Handle: RePEc:wly:jnddns:v:2016:y:2016:i:1:n:8352317
    DOI: 10.1155/2016/8352317
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    References listed on IDEAS

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    1. Stevanovic, Vladimir D. & Wala, Tadeusz & Muszynski, Slawomir & Milic, Milos & Jovanovic, Milorad, 2014. "Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620 MWe lignite-fired power plant," Energy, Elsevier, vol. 66(C), pages 907-918.
    2. You, C.F. & Xu, X.C., 2010. "Coal combustion and its pollution control in China," Energy, Elsevier, vol. 35(11), pages 4467-4472.
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