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Journal of Thermal Science

, Volume 21, Issue 4, pp 368–376 | Cite as

The heat transfer coefficients of the heating surface of 300 MWe CFB boiler

  • Haibo Wu
  • Man Zhang
  • Qinggang Lu
  • Yunkai Sun
Article

Abstract

A study of the heat transfer about the heating surface of three commercial 300 MWe CFB boilers was conducted in this work. The heat transfer coefficients of the platen heating surface, the external heat exchanger (EHE) and cyclone separator were calculated according to the relative operation data at different boiler loads. Moreover, the heat transfer coefficient of the waterwall was calculated by heat balance of the hot circuit of the CFB boiler. With the boiler capacity increasing, the heat transfer coefficients of these heating surface increases, and the heat transfer coefficient of the water wall is higher than that of the platen heating surface. The heat transfer coefficient of the EHE is the highest in high boiler load, the heat transfer coefficient of the cyclone separator is the lowest. Because the fired coal is different from the design coal in No.1 boiler, the ash content of the fired coal is much lower than that of the design coal. The heat transfer coefficients which calculated with the operation data are lower than the previous design value and that is the reason why the bed temperature is rather high during the boiler operation in No.1 boiler.

Keywords

CFB boiler heating surface heat transfer coefficient calculation 

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Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Haibo Wu
    • 1
    • 2
  • Man Zhang
    • 1
  • Qinggang Lu
    • 1
  • Yunkai Sun
    • 1
  1. 1.Institute of Engineering ThermophysicsChinese Academy of SciencesBeijingChina
  2. 2.Graduate University of Chinese Academy of SciencesBeijingChina

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