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Exergy analysis on the irreversibility of rotary air preheater in thermal power plant

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  • Wang, Hong Yue
  • Zhao, Ling Ling
  • Zhou, Qiang Tai
  • Xu, Zhi Gao
  • Kim, Hyung Taek

Abstract

Energy recovery devices can have a substantial impact on process efficiency and their relevance to the problem of conservation of energy resources is generally recognized to be beyond dispute. One type of such a device, which is commonly used in thermal power plants and air conditioning systems, is the rotary air preheater. A major disadvantage of the rotary air preheater is that there is an unavoidable leakage due to carry over and pressure difference. There are gas streams involved in the heat transfer and mixing processes. There are also irreversibilities, or exergy destruction, due to mixing, pressure losses and temperature gradients. Therefore, the purpose of this research paper is based from the second law of thermodynamics, which is to build up the relationship between the efficiency of the thermal power plant and the total process of irreversibility in the rotary air preheater using exergy analysis. For this, the effects of the variation of the principal design parameters on the rotary air preheater efficiency, the exergy efficiency, and the efficiency of the thermal power plant are examined by changing a number of parameters of rotary air preheater. Furthermore, some conclusions are reached and recommendations are made so as to give insight on designing some optimal parameters.

Suggested Citation

  • Wang, Hong Yue & Zhao, Ling Ling & Zhou, Qiang Tai & Xu, Zhi Gao & Kim, Hyung Taek, 2008. "Exergy analysis on the irreversibility of rotary air preheater in thermal power plant," Energy, Elsevier, vol. 33(4), pages 647-656.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:4:p:647-656
    DOI: 10.1016/j.energy.2007.11.011
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    References listed on IDEAS

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    1. Koroneos, Christopher & Spachos, Thomas & Moussiopoulos, Nikolaos, 2003. "Exergy analysis of renewable energy sources," Renewable Energy, Elsevier, vol. 28(2), pages 295-310.
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    3. Kanoglu, Mehmet & Dincer, Ibrahim & Rosen, Marc A., 2007. "Understanding energy and exergy efficiencies for improved energy management in power plants," Energy Policy, Elsevier, vol. 35(7), pages 3967-3978, July.
    4. Khalid Ahmed, C.S & Gandhidasan, P & Zubair, S.M & Al-Farayedhi, A.A, 1998. "Exergy analysis of a liquid-desiccant-based, hybrid air-conditioning system," Energy, Elsevier, vol. 23(1), pages 51-59.
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    Cited by:

    1. Zeng, M. & Du, L.X. & Liao, D. & Chu, W.X. & Wang, Q.W. & Luo, Y. & Sun, Y., 2012. "Investigation on pressure drop and heat transfer performances of plate-fin iron air preheater unit with experimental and Genetic Algorithm methods," Applied Energy, Elsevier, vol. 92(C), pages 725-732.
    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. San, J.-Y., 2010. "Second-law performance of heat exchangers for waste heat recovery," Energy, Elsevier, vol. 35(5), pages 1936-1945.

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