Apparatus and method for dosing

Dispensing – Automatic control – Motor control

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222195, 406 30, 366101, 366107, B67D 508

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active

055381626

ABSTRACT:
A dosing apparatus provides for dosing a particulate phase within a free flowing two phase flow of a gas phase and the particulate phase, wherein the two phase flow leaves a fluidized bed. The apparatus includes, at its bottom, a gas inlet mechanism to supply the gas via an orifice, and an outlet orifice with a discharge pipe. Control of the gas flow to maintain a predetermined level of the bed is attained by weighing the contents of the bed or by use of sensors within a treatment space of the apparatus. Widening mechanism may be located subsequent to the outlet orifice for widening the stream of particulate phase for exposing an enlarged surface area of particles for treatment.

REFERENCES:
patent: 4532108 (1985-07-01), Becht, IV
patent: 4784533 (1988-11-01), Teigen
Patent Abstracts of Japan Jun. 10, 1980 vol. 4, No. 80 (M-15).
Patent Abstracts of Japan Aug. 10, 1988 vol. 12, No. 292 (M-729).
"Fluidization" Cambridge University Press Coexistence of Fluidized Flow in Picked Bed Flow . . . L. S. Leung, Jones 1978 pp. 116-131.
P. J. Jones et al "Fluidization", Academic Press London Chap. 8 Downflow-of Solids Through Pipes & Valves 1985 pp. 293-330.
D. P. O'Dea et al Powder Technology 62 pp. 241-247 "Gas-Solids Flow Through the Bottom Restrictive of . . . "1940.
M. Robin-Judd et al The American Inst. of Chemical Engineers "The Flow of Fine, Dense Solids Down . . . "1978.
R. J. Burkett et al Chemical Eng. Science, vol. 26 pp. 405-417 Pergamon Press /"On the Flow of Fluidized . . . " 1971.
L. Massimilla "Fluidization" Academic Press NY Chap 15 Flow-Properties of the Fluidized Devise . . . 1971.
W. Barth et al, Chemie-Eng.-Techn. 29 pp. 597-602 "Neves Verfahren Zur Bestimming . . . " 1957.
Tesch (thesis) "Zeitkonstantes Dosiereu Feiner Feiner Feststoffe" Zurich Diss. Etll Nr 9583 1991.
Foreign Patent Document European Patent Application 0084887 Applicant: Stone & Webster Engineering Aug. 3, 1983.

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