EP2251099B2 - Dispositif de séparation d'un matériau en produits fins et produits grossiers - Google Patents

Dispositif de séparation d'un matériau en produits fins et produits grossiers Download PDF

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Publication number
EP2251099B2
EP2251099B2 EP10004849.5A EP10004849A EP2251099B2 EP 2251099 B2 EP2251099 B2 EP 2251099B2 EP 10004849 A EP10004849 A EP 10004849A EP 2251099 B2 EP2251099 B2 EP 2251099B2
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European Patent Office
Prior art keywords
classifying
air
distribution channel
zone
flow direction
Prior art date
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Application number
EP10004849.5A
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German (de)
English (en)
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EP2251099A3 (fr
EP2251099A2 (fr
EP2251099B1 (fr
Inventor
Hartmut Pallmann
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Hosokawa Alpine AG
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Hosokawa Alpine AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents

Definitions

  • the invention relates to a device for separating feed material into fine material and coarse material according to the preamble of patent claim 1.
  • Generic devices are known (see for example DE-A-1 607 631 ) and are often used as a downstream classification stage to separate coarse material from a gas-solids flow from an upstream process.
  • the upstream process can be carried out, for example, using a mill, a cyclone separator or a static or dynamic classifier.
  • systems are known in which the feedstock is fed to a first classification stage in the form of a basket classifier, where the fines are first removed from the feedstock. Particles that are rejected by the sifting wheel due to their size or weight flow along the inner wall of a cone forming the lower housing part, which opens into the cylindrical sifting zone of a second sifting stage.
  • the cylindrical sifting zone is concentrically surrounded by a ring duct, which is supplied with sifting air via a radial air inlet. The sifting air enters the sifting zone through openings in the wall between the cylindrical sifting zone and the ring channel, where it meets the material flow coming from the inner cone.
  • the feed material undergoes a second classification, with the fines being returned by the classifying air up to the basket classifier, while the oversize material leaves the classifying zone by gravity downwards, where it is collected and drawn off from time to time.
  • the selectivity of the second separation stage is not satisfactory, which means that the grain size distribution of the fines and the coarse material still has too many shares of the other fraction in each case.
  • the object of the invention is to further develop known classifiers with a view to maintaining a specified separation limit as precisely as possible.
  • a device was constructed in which the sifting air enters the sifting zone at a uniform flow rate over the entire circumference, with the result that a preselected separation limit is maintained exactly and permanently.
  • the invention assumes that, ideally, the quotient of the time-dependent volume flow of the sifting air and the area of the flow cross section of the distribution channel should remain as constant as possible over the entire length of the distribution channel in order to ensure a uniform flow rate in the distribution channel and thus when entering the classification zone obtain. Since the volume of the sifting air flow in the direction of flow through the distributor duct decreases to the extent that sifting air enters the sifting zone, the speed loss observed in the prior art can be counteracted by the distributor duct becoming increasingly smaller in cross section.
  • the speed losses are exactly compensated according to the invention by a corresponding reduction in the flow cross section in the plenum, that is, the sifting air flows at the beginning of the plenum at the same speed in the sifting zone as at the end of the plenum or somewhere in between. This creates uniform starting parameters for the sifting process over the entire sifting zone with the effect of a consistently high selectivity.
  • the reduction in the throughflow cross section of the distribution channel is preferably achieved by reducing its radial extension, the height of the distribution channel being able to be left as it is and thus not significantly increasing the structural complexity.
  • the flow cross section can be reduced in several stages, each of which extends over a peripheral section of the distribution channel.
  • a continuous course of the outer peripheral wall of the distribution channel is preferred, for example by the outer peripheral wall spiraling closer to the opposite circular-cylindrical wall delimiting the viewing zone.
  • the partition wall is formed according to a particularly preferred embodiment by a large number of air guide vanes arranged along the circumference of the classification zone. As a result of maintaining a tangential distance between two adjacent air guide vanes, axial passage gaps arise for the sifting air.
  • the rear end of the plate-like air guide vanes in the direction of flow can connect tangentially to the circular-cylindrical circumference of the sifting zone, while their front end protrudes into the distribution channel.
  • the front ends of the air guide vanes form a type of funnel that captures the separating air flow and concentrates it on the passage opening.
  • a device results in combination as a second classification stage after a static or dynamic classifier, such as a basket classifier, in which the fines discharge is arranged axially above the cylindrical classification zone, so that the fines coming from the classification zone can be fed to the fines discharge.
  • a static or dynamic classifier such as a basket classifier
  • the Figures 1 and 2 12 show a device 1 according to the invention in the essential sections, the device 1 in the present exemplary embodiment being integrated into a two-stage sifting process.
  • the first sifting stage is formed by a basket sifter, of which only the lower housing part 2 with a cylindrical section 3 and an inner cone 4 is shown. The lower end of a fines discharge 5 can also be seen.
  • the feed material 6 rejected by the sifting wheel which still contains fines and coarse material, flows downwards in the direction of the device 1 according to the invention, where a subsequent sifting takes place in a second stage.
  • the device 1 has a substantially cylindrical housing 7 which extends coaxially along the axis 8 and connects to the inner cone 4 of the basket classifier at the top.
  • a distributor channel 9 which is rectangular in cross-section and runs in a radial plane to the axis 8, which is composed of a bottom ring disk 10, a cover ring disk 11 lying plane-parallel opposite it at an axial distance, and an inner wall 12 connecting the two ring disks 10 and 11 in each case and outer wall 13.
  • an inlet connector 14 for supplying the sifting air opens tangentially into the distribution channel 9 .
  • the arrows 15 symbolize the classifying air flow within the distribution channel 9.
  • the outer wall 13 of the distribution channel 9 has a spiral course with respect to the axis 8, i.e. its distance from the axis 8 decreases in the flow direction 15.
  • the inner wall 12 surrounds the axis 8 concentrically, which together leads to a reduction in the radial extent of the distribution channel 9 and, with the axial height remaining the same, causes a steady reduction in the flow cross section in the flow direction 15 .
  • the inner wall 12 is made in a separate construction, that is, it is composed of a large number of individual air guide vanes 16 which are arranged at a tangential distance from one another.
  • the air guide vanes 16 consist of flat, plate-shaped elements whose opposing, axially extending end faces are bevelled, forming sharp edges 17 and 18 in this way.
  • the bevels of an air guide vane 16 formed in this way can run plane-parallel.
  • the air guide vanes 16 are attached in a tangential alignment to the axis 8 with their lower edge on the bottom ring disk 10 and with their upper edge on the cover ring disk 11 of the feed channel 9 .
  • edges 17 at the front in the direction of flow 15 extend into the distribution channel 9 , while the rear edges 18 are at the shortest distance from the axis 8 and adjoin a common circumferential circle 31 there tangentially.
  • the last air guide vane 16′ in flow direction 15 is longer and closes with its front end in flow direction 15 tightly against the outer wall 13 of distribution channel 9, so that it ends there and a circulatory flow of sifting air 15 is prevented.
  • This arrangement means that the outside 19 of a first air guide vane 16 in the flow direction 15, facing away from the axis 8, encloses a funnel-shaped gap 20 with the slope in the area of the front sharp edge 17 of the following air guide vane 16, which in the flow direction 15 extends into one of the slopes in the Area of the rear sharp edge 18 of the first air guide vane 16 and the axis 8 facing inside 22 of the following air guide vane 16 formed channel-shaped gap 21 with constant gap cross-section and causes a tangential orientation of the classifying air flow 15 'in this area.
  • the clearances between the vanes 16 extending along the circumferential circle 31 of the rear sharp edges 18 form passage openings 23 from the inside of the distribution channel 9 to a cylindrical classifying zone 24 enclosed by the inner wall 12.
  • the classifying air 15′ passes through the openings 23 tangentially into the classification zone 24 and sweeps with an axial upward component helically over the entire inner circumference of the classification zone 24 and hits the flow of feed material 6 directed axially downwards from the inner cone 4, which as a material curtain is also uniform over the entire circumference of the vision zone 24 is distributed.
  • the housing 7 continues in a cylindrical coarse material outlet 26, which merges into a collection cone 27 and whose lower end is closed by a discharge sluice 28.
  • the function of a device is as follows.
  • the feed material is sifted in a first sifting stage, for example on a sifting wheel of a basket sifter, and a first proportion of fines is drawn off.
  • the feed material 6 rejected at the sifting wheel is broken down further by the impact on the sifting wheel and as a result of turbulence-related collisions between the material particles, so that the feed material 6 still contains fines and coarse material, which is subjected to subsequent sifting to increase the efficiency of the sifting process.
  • the feed material 6 produced in the first classification stage flows axially downwards along the inner cone 4 into the region of the classification zone 24 of the device 1 according to the invention.
  • the device 1 used in the present example as a coarse material sifter is supplied with sifting air 15 by means of a blower (not shown), which air enters the distribution channel 9 via the inlet connector 14 .
  • a part of the sifting air 15 is branched off by the air guide vanes 16 and passed through the openings 23 in a tangential orientation to the axis 8 through the openings 23 into the sifting zone 24 (arrow 15′).
  • the splitting off of the partial sifting air flow 15' results in a volume reduction of the sifting air flow 15 in the distribution channel 9.
  • the flow cross section in the flow direction 15 decreases due to the spiral shape of the outer wall 13, which compensates for any speed losses in the sifting air flow 15 that would otherwise occur.
  • the speed of the sifting air 15 in the distribution channel 9 is thus constant over the entire circumference of the distribution duct 9 and thus also the entry speed of the sifting air 15' into the sifting zone 24.
  • the feed material 6 In the area of the sifting zone 24, the feed material 6 thus encounters a uniform sifting air flow 15', which flows upwards in a helical manner with a vertical component and, with a uniform drag force, detaches the fines, symbolized by the arrows 29, from the feed material 6 and conveys them to the fines discharge 5 or .feeds again to the basket sifter.
  • the coarse material 30 contained in the feed material 6 on the other hand, gravity prevails over the drag force of the sifting air flow 15', so that the coarse material 30 sinks in the direction of the coarse material discharge 26 and is then temporarily stored in the collecting cone 27 before it is removed from the device 1 via the discharge lock 28 .
  • the separation limit between fine material 29 and coarse material 30 can be set by appropriately selecting the flow rate of the sifting air 15 in the distribution channel 9.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Claims (7)

  1. Dispositif pour la classification d'un matériau d'alimentation (6) en particules fines (29) et en particules grossières (30)
    - avec une zone de classification cylindrique (24) s'étendant le long d'un axe (8),
    - avec un canal de répartition (9) pour l'amenée d'air de classification (15) qui s'étend sur le pourtour de la zone de classification cylindrique (24) et dont la section de flux décroît dans la direction de flux (15),
    - la zone de classification (24) et le canal de répartition (9) étant séparés l'un de l'autre par une paroi (12) possédant des orifices de passage (23) permettant l'entrée de l'air de classification (15) dans la zone de classification (24),
    - avec une trémie à matériau axialement adjacent à la zone de classification cylindrique (24) pour l'alimentation du matériau d'alimentation (6) dans le dispositif et
    - avec une sortie de particules grossières (26) et une aspiration des particules fines (5) permettant l'évacuation séparée des particules grossières (30) et des particules fines (29) hors du dispositif, la trémie à matériau etant formée par la partie inférieure du carter (2) d'un classificateur statique ou dynamique situé en amont et en ce que l'aspiration des particules fines (5) est située axialement au dessus de la zone de classification cylindrique (24) de telle sorte que les particules fines (29) venant de la zone de classification (24) peuvent être amenées à l'aspiration des particules fines (5) et la paroi (12) est formée d'un nombre de pales de guidage d'air (16) qui encerclent la zone de classification (24) et qui sont espacées entre elles pour former les orifices de passage (23), caractérisé en ce
    - qu'au moins une des faces frontales des pales de guidage (16) à orientation axiale présente une surface inclinée formant un rebord aigu (17, 18),
    - et en direction de flux, la surface inclinée d'une première pale de guidage (16) forme, avec la face intérieure d'une pale de guidage (16) suivante, une fente en forme de canal (21) et
    - qu'en direction de flux, la face extérieure d'une première pale de guidage (16) forme avec la surface inclinée de la pale de guidage (16) suivante une fente en forme d'entonnoir (20).
  2. Dispositif selon la revendication 1, caractérisé en ce que l'étendue radiale du canal de répartition (9) décroît en direction de flux (15) pour réduire la section de flux.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la zone de classification (24) a une section transversale cylindrique circulaire et la paroi extérieure (13) du canal de répartition (9) évolue en forme de spirale par rapport à l'axe (8) en direction de flux (15).
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le canal de répartition (9) peut être alimenté en air de classification (15) par le biais d'un manchon d'entrée (14) débouchant tangentiellement dans le canal de répartition (9).
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que le canal de répartition (9) est clos à son extrémité dans le sens périphérique.
  6. Dispositif selon la revendication 1, caractérisé en ce que les extrémités arrières des pales de guidage d'air (16) en direction de flux sont tangentiellement adjacentes à la zone de classification (24).
  7. Dispositif selon la revendication 1 ou 6, caractérisé en ce que l'extrémité arrière d'une pale de guidage (16) forme, avec l'extrémité avant d'une pale de guidage (16) avoisinante, une fente de passage (21) pour l'air de classification (15') débouchant tangentiellement dans la zone de classification (24).
EP10004849.5A 2009-05-11 2010-05-07 Dispositif de séparation d'un matériau en produits fins et produits grossiers Active EP2251099B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009020713A DE102009020713A1 (de) 2009-05-11 2009-05-11 Vorrichtung zum Trennen von Aufgabegut in Feingut und Grobgut

Publications (4)

Publication Number Publication Date
EP2251099A2 EP2251099A2 (fr) 2010-11-17
EP2251099A3 EP2251099A3 (fr) 2012-08-08
EP2251099B1 EP2251099B1 (fr) 2013-08-21
EP2251099B2 true EP2251099B2 (fr) 2022-12-28

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ID=42537653

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EP10004849.5A Active EP2251099B2 (fr) 2009-05-11 2010-05-07 Dispositif de séparation d'un matériau en produits fins et produits grossiers

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DE (1) DE102009020713A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106892284B (zh) * 2017-04-11 2023-06-09 沅陵县辰州荞韵食品有限公司 粮食谷物筛分农机设备及其工作方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1607631A1 (de) † 1967-07-27 1970-10-22 Krupp Gmbh Windsichter
DE3508889C1 (de) † 1985-03-13 1992-02-20 Alpine Ag, 8900 Augsburg Windsichter mit verschleissfreiem Sichtrad
CN2263554Y (zh) † 1996-05-21 1997-10-01 中国石油化工总公司 涡轮式粉状颗粒分级器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624528Y2 (fr) * 1977-11-18 1981-06-09
US4551241A (en) * 1984-02-08 1985-11-05 Sturtevant, Inc. Particle classifier
DE3943733C2 (de) * 1989-05-12 1999-01-21 Canon Kk Vorrichtung und Verfahren zur Zerkleinerung und Klassierung von Pulver in Feinpulver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1607631A1 (de) † 1967-07-27 1970-10-22 Krupp Gmbh Windsichter
DE3508889C1 (de) † 1985-03-13 1992-02-20 Alpine Ag, 8900 Augsburg Windsichter mit verschleissfreiem Sichtrad
CN2263554Y (zh) † 1996-05-21 1997-10-01 中国石油化工总公司 涡轮式粉状颗粒分级器

Also Published As

Publication number Publication date
EP2251099A3 (fr) 2012-08-08
EP2251099A2 (fr) 2010-11-17
EP2251099B1 (fr) 2013-08-21
DE102009020713A1 (de) 2010-11-18

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