GAS-SEPARATING METHOD AND APPARATUS THEREFOR

• US 3,680,695 A
• Filed: 11/28/1969
• Issued: 08/01/1972
• Est. Priority Date: 11/28/1969
• Status: Expired due to Term

• Current Assignee: Nobuo Yoshimori, Toshio Sato, Tsuguo Nagayama
• Original Assignee: Nobuo Yoshimori, Toshio Sato, Tsuguo Nagayama
• Inventors: Sato, Toshio, Yoshimori, Nobuo, Nagayama, Tsuguo
• Primary Examiner(s): Lutter, Frank W.
• Assistant Examiner(s): Hill, Ralph J.
• Application Number:
  US04/889,013
• Time in Patent Office: 977 Days
• Field of Search: 209/139R,144,139A
• US Class Current: 209/139.2
• CPC Class Codes: B07B 7/08 using centrifugal force centrifuges B04B; cyclones B04C

Abstract

The invention relates to a method of separation of particulate material using a fluid and an apparatus therefor wherein first whirling vanes are used to disperse a material-charged gas supplied into the central part of a casing and float this material in a whirling ascending current fed to the bottom part of the casing, providing a first separating effect due to the gravity acting on the rising current, leading the charged gas to an upper outlet, and providing the second separating effect due to second whirling vanes in the course of said whirling ascent, said second whirling vanes being located above and spaced from said first whirling vanes, as well as guiding to the lower part of the casing, the separated heavy particles which are descending from the upper part of the casing. A third separating effect is also provided due to the first whirling vanes dispersing and supplying the inflowing charged materials to falling rough particles which are led to the lower part of the casing so as to separate fine powders mixed in rough particles, and as a result of this continuous sequence of separating steps, the work flows smoothly and efficiently.

Claims

1. An apparatus for separating particulate material into fine and heavy particles, comprising in combination:

a. a housing having an inner cylindrical wall, a lower hopper for the removal of heavy particles and an upper outlet for the removal of fine particles;

b. a first disc (4) disposed for rotatiOn towards the lower part of said housing, said disc having a plurality of first radial vanes (5) disposed under said disc, said vanes extending almost to said inner wall and having an edge (51) bent opposite to the rotational direction of said vanes and a pendant part (52) extending downwards;

c. at least one second disc (3) with outwardly extending second radial vanes (8) disposed for rotation towards the upper part of said housing, said vanes extending almost to said inner wall;

d. a feed chute (2) extending downwards from outside of the housing to over the center of said first disc for feeding particulate material onto the first disc at the about center thereof; and

, e. a blow-in circular passage (60) below said first disc to tangentially blow in a gas fluid, said vanes pendant part (52) being disposed around said circular passage (60), whereby particulate material dropped into said first disc is centrifuged outward to the wall, very heavy particles falling by gravity along the wall and, heavy medium and fine particles being swept up by the blown-in gas fluid current to the second disc, the lighter particles being swept outwards past the vanes of the second disc whereas the heavier particles fall back on the first disc and are subjected to a third separation.

2. An apparatus as claimed in claim 1, including a third disc with outwardly extending third radial vanes similar to said second disc and said second vanes disposed a short distance from said second disc and vanes, said second and third disc and vanes producing gas fluid currents, swirling about an axis normal to that of said cylindrical wall.

3. An apparatus as claimed in claim 2, including inwardly projecting collars (28) on said cylindrical wall at the locations of said second and third discs and outwardly projecting blades (8a) on said second and third vanes, the blades projecting under said collars, said collars having a downwardly slanting inner collar wall and said blades having an upwardly slanting outer edge disposed under said slanting inner collar wall, said arrangement selectively allowing only finer particles to pass between said collars and blades.

4. An apparatus as claimed in claim 1, said blowin opening passage (60) extending around the lower portion of said cylindrical wall, outwards of said wall at the location of said first disc and first vanes.

5. An apparatus as claimed in claim 4, said first disc being at the top of said blow-in opening, said pendant part (52) extending downwards the length of said opening.

6. A method of separating particulate material, comprising the steps of:

a. chuting the particulate material angularly downwards from outside a cylindrical workstation onto a vaned rotating disc within a lower-rotary treatment zone within said cylindrical workstation;

b. tangentially blowing in a gas stream below said rotating disc while causing said gas to rise, the blowing rate of the gas being such that said vaned disc rotates within a range of between about 10 to about 30 percent of said blowing rate so that said particulate matter is outwardly centrifuged and a first separation takes place, the heavier particles falling by gravity between the outer periphery of said lower rotary treatment zone and the said cylindrical workstation, the lighter particles being carried upwards with said blown-in gas;

c. passing said material-laden gas through an upper rotary treatment zone having first and second vaned sections wherein vanes rotate adjacent said cylindrical workstation, said upper treatment zone including first and second flue zones defined between said vaned sections and said cylindrical workstation, whereat a second separation takes place, the finer particles flowing outwards past the upper rotary treatment zone, the heavier particles falling back onto said lower rotary treatment zone whereat a third separation takes place as the falling material is mixed with newly chuted fresh material; and

, d. removing the heavier particles from a first accumulation zone below said cylindrical workstation and also removing the finer particles from a second accumulation zone receiving fine particles flowing outwards from the upper part of said cylindrical workstation.