Method and apparatus for improving heat transfer in a fluidized

Details Method and apparatus for improving heat transfer in a fluidized Method and apparatus for improving heat transfer in a fluidized

1988-10-17

1990-01-02

Davis, Jr., Albert W.

Heat exchange

Regenerator

Checker brick structure

165 96, 16510416, 165 32, F28D 1300, F28F 1314

Patent

active

048906670

ABSTRACT:
An apparatus contains a fluidized bed that includes particles of different triboelectrical types, each particle type acquiring an opposite polarity upon contact. The contact may occur between particles of the two types or between particles of etiher type and structure or fluid present in the apparatus. A fluidizing gas flow is passed through the particles to produce the fluidized bed. Immersed within the bed are electrodes. An alternating EMF source connected to the electrodes applies an alternating electric field across the fluidized bed to cause particles of the first type to move relative to particles of the second type and relative to the gas flow. In a heat exchanger incorporating the apparatus, the electrodes are conduits conveying a fluid to be heated. The two particle types alternately contact each conduit to transfer heat from a hot gas flow to the second fluid within the conduit.

REFERENCES:
Elsdon et al., "Heat Transfer In a Gas Fluidized Bed Assisted By an Alternating Electric Field," Chemical Engineering Science, 32:1147-1153 (1977).
Min et al., "Particle Transport and Heat Transfer in Gas-Solid Suspension Flow Under the Influence of an Electric Field," Nucl. Sci. & Eng., 26:534-546 (1966).
Pearse et al., "The Separation of Quartz-Dolomite Powders Using a Tribo-Electric Technique," Powder Technology, 14:7-15 (1976).
Pearse et al., "The Triboelectric Separation of Quartz-Calcite and Quartz-Apatite Powders After Chemical Conditioning," Powder Technol., 17:83-89 (1977).
Wolny et al., "Electric Charge Neutralization by Addition of Fines to a Fluidized Bed Composed of Coarse Dielectric Particles," Journal of Electrostatics, 14:279-289 (1983).

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