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Session 2548

THEORETICAL CONSIDERATION OF COMPLEX HEAT TRANSFER IN THE FREEBOARD REGION ABOVE THE FLUIDIZED BED

Vladimir Sheyman, Mulchand S Rathod Division of Engineering Technology Wayne State University, Detroit, Michigan

V. A. Borodulya, Y. S. Teplitsky, A. F. Hassoun Heat and Mass Transfer Institute Belorussion Academy of Sciences, Minsk, Belarus

SUMMARY equations which modulate the main processes of heat transfer in the freeboard region combustion This paper discusses the scope and chamber within fluidized bed are also derived. studies based on a complex heat transfer process Results of this analytical work will be used to in a fluidized bed. The heat transfer process design the experimental setup for research. occurring in the freeboard region above the bed exert a great influence on the thermal region in NOMENCLATURE the whole apparatus containing a fluidized bed. This region occupies up to 90% of the working C Specific heat, J/kg C volume of the configuration. For this reason, the information of regularity of the heat transfer d Diameter of particles, m in the freeboard region above the bed with the heat transfer surface becomes very important in g Gravitational acceleration, m/s2 very large size equipment. It should be noted that the regularities of the heat transfer in this h Heat transfer coefficient, W/m2 -C region are much more complicated than those in the fluidized bed itself. h4 Asymptotic value of h, W/m2 C

This circumstance apparently is due to k Thermal conductivity of fluid, W/m-C the fact that the space above the bed is essentially nonhomogeneous in the vertical q Heat transfer rate, J/s direction. The aerodynamic non-homogeneity is caused by nonuniform concentration of the T Temperature, K particulates. This in turn results in thermal non- homogeneity. The variation of particulate U0 Starting velocity of fluidization, m/s concentration from about 10-3 to 103 kg/m3 leads to corresponding strong changes in the transfer U Velocity of filtration, m/s properties of the system. This essentially complicates the research of the regularities of V Module of normal velocity component of heat transfer to the surface in the space above particle, m/s the bed. Z Height over the gas distribution grid, m To solve this problem, the work consists of theoretical and experimental components. Z0 Initial height of the bed, m The first phase of this work, dealing with theoretical analysis, will be covered in this e Porousness paper. From the mathematical treatment, a relationship between the heat transfer coefficient ew Emissivity of heat transfer surface and the defining factors is established. The

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Teplitsky, Y. S., & Borodulya, V. A., & Hassoun, A. F., & Rathod, M. S., & Sheyman, V. (1999, June), Theoretical Consideration Of Complex Heat Transfer In The Freeboard Region Above The Fluidized Bed Paper presented at 1999 Annual Conference, Charlotte, North Carolina. 10.18260/1-2--8075