JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2016, Vol. 46 ›› Issue (5): 126-130.doi: 10.6040/j.issn.1672-3961.0.2016.036

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Coupling calculation between thermal model and air leakage model of quad-sectional rotary air preheater

CHU Da, SHI Yuetao*, WANG Xiaojuan   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2016-01-20 Online:2016-10-20 Published:2016-01-20

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Abstract: In order to analyze the heat transfer performance and low-temperature corrosion resistance property of quad-sectional rotary air preheater, the thermal and air-leakage calculation model were built and a concept named low-temperature area rate was proposed. With the air leakage ignored, thermal model was solved by numerical finite difference method based on control equations of rotary air preheater and temperature distribution was acquired. The energy and mass equations of air leakage were solved according to the results of thermal calculation and air leakage rate was obtained. Then iterative calculation of these two models was carried out in accordance with inlet and outlet parameters. The results showed that the difference between the calculated value and the designed value was less than 5%. Air leakage of quad-sectional air preheater was much less than that of tri-sectional one with the same heat transfer area. The temperature distributions of fluids in different channels were continuous and consistent with matrix. The low-temperature area rate was reduced with the decline of inlet gas flow along the direction of rotary, which helped to avoid low-temperature corrosion.

Key words: air leakage model, low-temperature area rate, thermal model, low-temperature corrosion, quad-sectional rotary air preheater

CLC Number: 

  • TK172
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