Fluidized-bed classifier

Details Fluidized-bed classifier Fluidized-bed classifier

1997-04-15

1999-11-02

Nguyen, Tuan N.

Classifying, separating, and assorting solids

Stratifiers

With pneumatic treatment

209 20, 209138, 209494, 209502, B07B 400

Patent

active

059753099

ABSTRACT:
A fluidized-bed classifier has a vessel defining a space divided into an upper fluidized-bed chamber and a lower gas chamber by a perforated dispersion plate having the shape of a funnel. Rising currents of a gas, such as air, are blown through the dispersion plate into the upper fluidized-bed chamber to produce a fluidized bed of a particulate material over the dispersion plate. The lower gas chamber is divided into a first gas chamber and a second gas chamber by a partition plate. The gas is supplied into the first air chamber so that rising gas currents of a velocity necessary for fluidizing coarse particles contained in the particulate material fed into the vessel are blown from the first air chamber through the dispersion plate into the fluidized-bed chamber. The gas is supplied into the second air chamber so that rising gas currents of a velocity lower than the velocity of the rising gas currents blown from the first air chamber into the fluidized-bed chamber are blown into the fluidized-bed chamber so that coarse particles contained in the particulate material are not fluidized and does not flow together with fine particles into a fine particle discharge chute.

REFERENCES:
patent: 2069325 (1937-02-01), Morgan
patent: 3774759 (1973-11-01), Weintraub et al.
patent: 4115256 (1978-09-01), de Zeeuw
patent: 4946044 (1990-08-01), Havrilla
patent: 5299694 (1994-04-01), Rambaud
patent: 5388704 (1995-02-01), Morris
Patent Abstracts of Japan , vol. 96, No. 3, Mar. 29, 1996, abstract of JP 07 299419 A (published Nov. 14, 1995).

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