Graduate Thesis Or Dissertation
 

Measuring solids movement in a large particle, air fluidized bed : two new methods

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  • Two new methods for the determination of solids movement in a fluidized bed have been developed and evaluated in this work. The first method used a deflecting plexiglass rod with strain gages attached to the base which is immersed in the bed of fluidized solids. The probe will yield a continuous output of upward and downward solids fluxes moving past the probe. The output is used in conjunction with rectifying and averaging circuit to yield average upward and downward mass fluxes which are used to calculate solids turnover rates. The second method utilizes ferrite tracer material and immersed indoctapce coil detectors used in conjunction with a compartmental flow model. The transient tracer curves of the probes are then manipulated to calculate vertical solids turnover rates. The strain gage probe method found turnover rates for a tube filled bed and a tube free bed which was 1 ft² (930 cm²) in area and 1 ft (30.5 cm). high. Bed solids were 0.96 mm (0.038 inch) silica sand. For the tube free bed, turnover rates ranged from 0.58-1.31 gm/cm² -sec (1.19-2.68 lb/ft² -sec), U[subscript o]/U[subscript mf] = 1.3-2.0. For the tube filled bed, turnover rates ranged from 0.31-0.78 gm/cm ² -sec (0.63-1.60 lb/ft²-sec). The inductance probe could not be used due to poor tracer mixing in the small fluidized bed. The inductance probe has been tested in a 1 m ² (10.8 ft ² ) large particle fluidized bed and works well.
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