Calculations related to dry boiling fluidized beds
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Recently, a new set of fluidized beds for calcium chloride drying was put into operation, and an analysis of the manufacturer’s design revealed some issues. The fluidized bed area designed by the equipment manufacturer is 4.6 m2, with an open area ratio of 21%. The designed air volume is 8000 m3/h, the particle diameter of the material is D=3 mm, and its true density is 2100 kg/m3. With wind speeds reaching 27 m/s, it seems that the fans designed are too large, resulting in significant energy waste.
I’m not sure how you came up with 27 m/s. 8000 m3/h, an area of 4.6 m2; the wind speed I calculated is 0.48 m/s. Including a porosity of 21%, the gas velocity is 2.3 m/s.
21% is way too high; fluidized bed reactors usually have values in the range of 1–8%.