STUDIES ON TOTAL AND RADIATIVE HEAT TRANSFER IN CIRCULATING FLUIDIZED BEDS
Present paper deals with the prediction and contribution of radiation to total heat transfer in a circulating fluidized bed.The radiative transfer equation is solved by using discrete transfer method to account for the radiative heat transfer.Independent scattering theory is employed to calculate the scattering and absorption coefficient in the emulsion layer.Non-uniform emulsion layer model is used for predicting the conductive and convective component of heat transfer.The lateral temperature distribution, spatial variation of solid volume fraction and thickness of gas in the emulsion layer is estimated using empirical correlations.The results are predicted for a CFB riser with 14.2 m height and 0.2 m×0.2 m cross-sectional area with particles of mean diameter in the range of 100-600 μm.Results were obtained for bed temperature of 600-850 ℃ and wall temperature 400 ℃.A comparison with experimental data is obtained and found satisfactory in the temperature range.The influence of bed temperature, suspension density, and particle size on radiation heat transfer coefficient along the height of the riser is found to be significant.
Subhransu Sekhar Mallick Pinakeswar Mahanta Abinash Mahapatro
Department of Mechanical Engineering,Indian Institute of Technology Guwahati-781039,India Centers for Energy,Indian Institute of Technology Guwahati-781039,India
国际会议
The 11th International Conference on Fluidized Bed Technology(CFB-11)(第十一届流化床技术国际会议)
北京
英文
447-453
2014-05-14（万方平台首次上网日期，不代表论文的发表时间）