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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

EXPERIMENTAL STUDIES OF HEAT TRANSFER FROM AN ATMOSPHERIC-FLU ID I ZED-BED COMBUSTOR TO AN IMMERSED ARRAY OF HORIZONTAL TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC7.2270
pages 295-300

要約

Experimental data are obtained for the heat transfer coefficient between immersed boiler tubes and an atmospheric-fluidized-bed coal combustor. Silica sand (d = 562 to 1128 µm) is used as bed material during the combustion of low-rank coals. The tests are performed, with and without limestone addition and ash recycle, at average bed temperature ranging from 1043 to 1179 K, superficial fluidizing velocities from 0.343 to 0.888 kg/(m2 s)(1.02 to 2.70 m/s) and excess air levels of 14 to 54 percent. The experimental data is examined in the light of the existing correlations for the heat transfer coefficient between an immersed staggered array of horizontal tubes and a gas-solid fluidized bed. The predicted values of the heat transfer coefficient from the correlations proposed in two References [13,14] are generally in good agreement with the experimental values of the heat transfer coefficient, when the contribution due to radiation is also included.