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《Journal of Southeast University(Natural Science Edition)》 2008-06
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Study on radiation heat transfer in boiler furnaces by taking radiant intensity attenuation in cross section into consideration

Zhou Qiangtai Zhao Lingling(School of Energy and Environment,Southeast University,Nanjing 210096,China)  
Using the radiation heat transfer formula between two infinite parallel plates as the basic method to calculate the radiation heat transfer from the furnace flame to the surrounded furnace water wall of steam boilers is analyzed in this paper.Since the basic condition assumes the flame temperature to be uniform elsewhere in the cross section of the furnace and without any attenuation of radiation intensity from the furnace central line to the surrounded water wall,the deviation of the calculation results is unavoidable. The calculation formula of furnace radiation heat transfer in the 1973-normative method of pre-Russia has the same necessary condition as that of two infinite parallel plate formula.Assuming that the boiler furnace is cylindrical with the identity of the cross sectional area and the height,based on the radiant energy transfer equation mentioned by Robert Siegel,and taking account of the medium Absorption,emission and scattering along the path of the radiation ray,the one dimensional equation of the radiation intensity attenuation from the furnace centre to the surrounded water wall has been derived in this paper,and furthermore, the radiation heat transfer calculation formula for the furnace flame of pulverized-coal steam boilers has been obtained.The characteristics of the obtained formula and its suitability for the radiation heat transfer calculation of steam boilers furnaces are analyzed.The obtained formula has been used to calculate the furnace exit flue gas temperature for the modern power plant boilers burned with different ash contents of three typical bituminous coals and the results are compared with those of some other calculation methods and the comment on the relevant calculation methods is made.
【CateGory Index】: TK221
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