Drying and gas or vapor contact with solids – Apparatus – With apparatus using centrifugal force
Patent
1989-10-25
1991-08-20
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With apparatus using centrifugal force
34 60, 159DIG3, F26B 1700
Patent
active
050403109
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fluidized bed apparatus, in particular for granulation of pulverulent substance, comprising therebelow a wind chamber and between the two a sieve bottom, and bottom, is rotatably drivable about an upright central axis and comprises at least one opening which is elongated in approximately radial direction and which permits a gas stream from the wind chamber through the sieve bottom upwardly into the treatment space.
In a fluidized bed apparatus belonging to this class and known from U.S. Pat. No. 3,849,900, which is provided for drying particles, the rotor consists of a vertical shaft with a flat circular disc. The latter has a somewhat greater diameter than the sieve bottom and has two or more circular-sector-shaped openings. The sieve bottom belongs to a drawer-like box which can be drawn out of the container and in its operating position is sealed with respect to the container by inflatable hose seals. One of said hose seals lies between a lower frame portion of the box surrounding the sieve bottom or tray and a step formed therebelow in the container. It is only beneath the latter that the rotor disc is arranged and consequently has a considerable vertical distance from the sieve bottom. In operation of this known fluidized bed apparatus heated dry air is blown from the wind chamber through the rotating rotor and through the sieve bottom into the treatment space so that a pulverulent substance therein, depending on the configuration of the rotor disc, is fluidized in one or more diffusely defined zones of the treatement space and dried.
Another fluidized bed apparatus known from DE 2932803 A1 comprises a rotor having a U-shaped profile in axial cross-section which is partially covered upwardly by a diaphragm provided with air exit openings. The rotor is mounted on a hollow shaft and connected drivably via the latter and to the pressure side of a fan. Extending upwardly within the hollow shaft is a liquid conduit which terminates in a stationary spray nozzle disposed centrally directly above the sieve bottom. The region around the rotor beneath the sieve bottom is constructed as suction chamber and connected to the suction side of the fan. In this known apparatus dry air from the hollow shaft is deflected radially outwardly into the U-shaped rotor profile to flow from there upwardly through the sieve bottom into the treatment space and to fluidize the substance contained therein. Through the central nozzle liquid is sprayed into the fluidized substance so that depending on the nature of the latter and the liquid an agglomeration granulate is for example formed or the particles of the already granulate-like substance are provided with a coating. The used air flows once again through the sieve bottom out of the treatment space into the suction chamber.
Furthermore, from DE 2551578 A1 a fluidized bed apparatus is known in which a treatment space is defined downwardly by a sealing bottom and upwardly by a filter arrangement. Arranged directly above the bottom is a two-vane or multi-vane rotor which is driven by a hollow shaft and is connected to the pressure side of a fan. The individual vanes of the rotor are provided with air exit openings which are rearwardly directed with respect to the direction of rotation. In one embodiment of this known apparatus in the treatment space a liquid nozzle is disposed centrally above the rotor. In another embodiment liquid nozzles are installed into the vanes of the rotor in such a manner that liquid is sprayed specifically into zones of the treatment space in which the substance is fluidized by the air emerging from the rotor.
The invention is based on the problem of further developing a fluidized bed apparatus in such a manner that compared with the known apparatuses described it requires less energy and time expenditure per unit weight of the substances to be processed and is particularly suitable for granulating difficultly fluidizable substances.
The problem is solved according to the invention in that arranged in an at least approximately
REFERENCES:
patent: 3849900 (1974-11-01), Dale et al.
patent: 3867114 (1974-11-01), Dale et al.
patent: 4320584 (1982-03-01), Huttlin
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