A Study on Heat Transfer Model in Sparse Zone of Oxy-Fuel Fired CFB

A model has been developed to calculate the coefficient heat transfer in sparse zone of oxy-fuel fired circulating fluidized bed boiler (CFBB). The model shows that the convective heat transfer coefficient is enhanced with increase in CO 2 density, bed temperature, and decrease in particle diameter;...

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Bibliographic Details
Main Authors: Chunbo Wang, Weijun Hou, Wei Zhang, Guang Lu, Zhihong Huo, Jiao Zhang
Format: Conference Proceeding
Language:English
Subjects:
Boilers
Combustion
Flue gases
Fluidization
Heat engines
Heat transfer
Power engineering
Temperature
Testing
Water heating
Online Access:Request full text
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Summary:A model has been developed to calculate the coefficient heat transfer in sparse zone of oxy-fuel fired circulating fluidized bed boiler (CFBB). The model shows that the convective heat transfer coefficient is enhanced with increase in CO 2 density, bed temperature, and decrease in particle diameter; and, the radiative heat transfer coefficient is enhanced with increase in bed temperature and CO 2 density. It was be found that temperature has important influence on both radiative and convective heat transfer. The CO 2 density is very important in enhancing the radiative heat transfer. For example, the total heat transfer could be 264.0 w/(m 2 ·k) when the CO 2 density is 80% when flue gas at 1273 K.
DOI:10.1109/ICEET.2009.130