Device for treating powder particles by rotary flow

• US 6,892,475 B2
• Filed: 10/25/2002
• Issued: 05/17/2005
• Est. Priority Date: 10/29/2001
• Status: Active Grant

• Current Assignee: Nara Machinery Co., Ltd.
• Original Assignee: Nara Machinery Co., Ltd.
• Inventors: Wakamatsu, Yoshihiro, Watano, Satoru
• Primary Examiner(s): Lu, Jiping
• Application Number:
  US10/483,581
• Publication Number:
  US 20040168342A1
• Time in Patent Office: 935 Days
• Field of Search: 345/76, 345/82, 345/86, 345/93, 343/68, 432/58, 422/139, 422/186, 422/186.3
• US Class Current: 34/576
• CPC Class Codes: B01F 23/566 by introducing liquids in a fluidised bed
• CPC Class Codes: B01F 27/96 with openwork frames or cages
• CPC Class Codes: B01F 29/00 Mixers with rotating receptacles
• CPC Class Codes: B01F 33/40 Mixers using gas or liquid agitation, e.g. with air supply tubes
• CPC Class Codes: B01F 33/406 in receptacles with gas supply only at the bottom B01F33/405 takes precedence
• CPC Class Codes: B01J 2/16 by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
• CPC Class Codes: B01J 8/38 with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it

Abstract

The present invention relates to a rotating fluidized bed apparatus for powder particle. A gas circulation path is formed at the periphery of the treatment chamber 2 via the circumferential faceplate 202, 212, and the circumferential faceplate is adapted to rotate around an axis. Behavior of powder particles can be controlled by introducing gas from the periphery of the treatment chamber via the circumferential plate 212 to exert centripetal force on the powder particle, while exerting centrifugal force on the powder particles accompanying rotation of the circumferential plate 212. In another aspect, by making the arrangement proportion of the bag filter 5 inside the treatment chamber 2 wider than the surface width of the dispersion plate 212 or larger than the surface area of the dispersion plate 212, it is possible to cause gas that has flowed into the treatment chamber 2 to be discharged at a lower rate at an axial region inside the treatment chamber 2 where centrifugal force is weak and discharge rate is fast. It is possible to carry out optimal operation control of introduction and discharge of gas for fluidized bed behavior.

Claims

1. A rotating fluidized bed apparatus for powder particles, said apparatus causing gas to flow into a cylindrical treatment chamber, in which the powder particles are placed, via a circumferential faceplate having permeability, and discharging gas that has flowed into the treatment chamber from the treatment chamber via a bag filter, wherein a gas circulation path is formed at the periphery of the treatment chamber via the circumferential faceplate, and wherein the bag filter is provided at a central portion inside the treatment chamber, and the circumferential faceplate is adapted to rotate circumferentially about the bag filter.

2. The rotating fluidized bed apparatus of claim 1, wherein a granulation nozzle is provided inside the bag filter.

3. The rotating fluidized bed apparatus of claim 1, wherein the bag filter is rotatable about its circumference, and is operably rotated by operation means.

4. The rotating fluidized bed apparatus of claim 1, wherein the bag filter is rotatable about its circumference, and is rotated by a drive unit.

5. The rotating fluidized bed apparatus of claim 4, wherein the rotational speed of the bag filter and the rotational speed of the circumferential plate are different.

6. The rotating fluidized bed apparatus of claim 1, wherein a drive unit for rotating the circumferential plate and a gas discharge path communicating with the bag filter are provided on one side of the treatment chamber, and a cover for opening and closing the treatment chamber is provided on the other side of the treatment chamber.

7. The rotating fluidized bed apparatus of claim 6, wherein at least part of the cover is made of a transparent material or semitransparent material.

8. The rotating fluidized bed apparatus of claim 1, wherein a casing body having the treatment chamber is arranged so that a rotational axis of the circumferential plate is horizontally oriented, and the casing is rotatable about a support shaft that is horizontally oriented and orthogonal to the rotational axis as a fulcrum.

9. The rotating fluidized bed apparatus of claim 8, wherein the casing body is operably rotated via a reduction gear mechanism comprising a worm gear.

10. The rotating fluidized bed apparatus of claim 1, wherein the circumferential plate is made of a porous plate, slits, metal mesh, multi-layer metal mesh or metal fibers.

11. The rotating fluidized bed apparatus of claim 1, wherein the bag filter is formed cylindrically of a retainer and bag cloth for covering the retainer.

12. The rotating fluidized bed apparatus of claim 1, said apparatus is used in a powder partide mixing process, a powder particle granulation process, a powder particle coating process, a powder particle dying process, or a powder particle reaction process.

13. A rotating fluidized bed apparatus for powder particle comprising, inside a casing,

a rotatable treatment chamber being provided with cylindrical gas ventilation means having permeability circumferentially about its axis,

gas introduction means provided at the periphery of the treatment chamber for causing gas to flow into the treatment chamber via the gas ventilation means, and

a bag filter, provided inside the treatment chamber, for discharging gas that has been introduced into the treatment chamber to the outside,

wherein the bag filter has an arrangement proportion inside the treatment chamber such that said proportion inside the treatment chamber is wider than a surface width of the gas ventilation means, or larger than the surface area of the gas ventilation means.

14. The rotating fluidized bed apparatus of claim 13, wherein the treatment chamber comprises an upright section upstanding in an axial direction from the gas ventilation means and having an arbitrary width, and an inclined section extending from the upright section.

15. The rotating fluidized bed apparatus of claim 14, wherein the inclined section is formed facing to the rear of the casing.

21. The rotating fluidized bed apparatus of claim 13, wherein the apparatus includes a frame for mounting a gas supply device, a collection bag filter and an operational control unit etc., the frame has an overall U-shape in front view, and the treatment chamber is mounted inside the U-shaped section via support shafts.

22. The rotating fluidized bed apparatus of claim 21, wherein one of the support shafts is made cylindrical, and the inside of the cylindrical support shaft constitutes a gas supply pipe linking the treatment chamber and the frame, and an arrangement path for wiring etc.

23. The rotating fluidized bed apparatus of claim 13, wherein an inner cover and an outer cover capable of being opened and closed are respectively provided at a front surface side of the treatment chamber and a front surface side of the casing, the inner cover for the treatment chamber being detachably attached to the treatment chamber, the outer cover for the casing being hinged at an upper section or lower section and constructed so as to be slide-stowed to the rear in an open state.

24. The rotating fluidized bed apparatus of claim 13, wherein the casing is formed in a truncated cone shape inclined forwardly.

16. A rotating fluidized bed apparatus for powder particle comprising, inside a casing,

a rotatable treatment chamber being provided with cylindrical gas ventilation means having permeability circumferentially about its axis,

gas introduction means provided at the periphery of the treatment chamber for causing gas to flow into the treatment chamber via the gas ventilation means, and

a bag filter, provided inside the treatment chamber, for discharging gas that has been introduced into the treatment chamber to the outside,

wherein the gas introduction means is comprised of a gas introduction passage formed between the casing and the ventilation means, and a plurality of supply ports provided at intervals on an inner wall forming the gas introduction passage.

17. The rotating fluidized bed apparatus of claim 16, wherein a gas supply chamber for distributing gas from the gas supply device to each of the supply ports is formed at a rear surface side of the supply ports, and the supply ports communicate with the gas supply chamber.

18. The rotating fluidized bed apparatus of claim 17, wherein the gas supply chamber is provided adjacent a rear surface side of the gas inflow passage at the portion of the supply ports.

19. The rotating fluidized bed apparatus of claim 16, wherein the supply ports are provided concentrically in one or two circles, or radially.

20. The rotating fluidized bed apparatus of claim 16, wherein the gas supply chamber is annular.

25. The rotating fluidized bed apparatus of claim 16, wherein the apparatus includes a frame for mounting a gas supply device, a collection bag filter and an operational control unit etc., the frame has an overall U-shape in front view, and the treatment chamber is mounted inside the U-shaped section via support shafts.

26. The rotating fluidized bed apparatus of claim 25, wherein one of the support shafts is made cylindrical, and the inside of the cylindrical support shaft constitutes a gas supply pipe linking the treatment chamber and the frame, and an arrangement path for wiring etc.

27. The rotating fluidized bed apparatus of claim 16, wherein an inner cover and an outer cover capable of being opened and closed are respectively provided at a front surface side of the treatment chamber and a front surface side of the casing, the inner cover for the treatment chamber being detachably attached to the treatment chamber, the outer cover for the casing being hinged at an upper section or lower section and constructed so as to be slide-stowed to the rear in an open state.

28. The rotating fluidized bed apparatus of claim 16, wherein the casing is formed in a truncated cone shape inclined forwardly.