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Study of Designing and Operating Parameters of Rotary Air Preheaters

Ahmadi Partovi, Ebrahim | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43019 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saidi, Mohammad Hassan; Kazemzadeh, Siamak
  7. Abstract:
  8. In order to promote the efficiency of fossil fuel power stations, rotary air preheaters are used to warm the air entering the boiler. So, knowing the essential parameters of such exchangers and their effect on the efficiency is the primary objective and choosing the appropriate parameters and the dimensions reducing the liquid pressure, weight of exchangers and subsequently the maintenance expenses would be the secondary objective.
    In this research we tried to know the principles of regenerative convertors introducing the tentative air preheaters and their functional characteristics .We also assessed the factors in designing the ideal tentative air preheaters including the type of material, the arrangement of matrixes, leakage and its modeling and element baskets corrosion in order to enhance the efficiency of fossil fuel exchangers. Finally we focused on a practical and functional prototype of such heat exchangers in Montazer Ghaem power station to define an engineer protocol to solve the problems of such products and increase the efficiency.
    APH Calculator software was exploited to calculate the parameters discussed, to compare the circumstances and to design them ideally. Regarding the fact that there is no possibility to redesign and replace a new exchanger because of different reasons, we tried to suggest practical solutions to promote the function of such exchangers.
    The researches illustrated that the main factor accountable for reducing the efficiency of tentative air preheaters are the enormous leakage, corrosion and inter digitations of element baskets. The current exchanger in Montazer Ghaem have an ideal yield equal to 92% while the actual efficiency is 55.9%. The ideal leakage of such exchangers is 10.3% of the air entrance mass flow while it reaches to 39.2% actually. So some strategies like installation and supporting the axial seal, changing the type and arrangement of the element baskets, warming the entering air to exchanger, using additives and etc are recommended
  9. Keywords:
  10. Waterproofing ; Corrosion ; Matrices ; Leakage ; Horizontal Air Preheater

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