EP2251099A2 - 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
EP2251099A2
EP2251099A2 EP10004849A EP10004849A EP2251099A2 EP 2251099 A2 EP2251099 A2 EP 2251099A2 EP 10004849 A EP10004849 A EP 10004849A EP 10004849 A EP10004849 A EP 10004849A EP 2251099 A2 EP2251099 A2 EP 2251099A2
Authority
EP
European Patent Office
Prior art keywords
distribution channel
air
viewing zone
classifying
channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10004849A
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German (de)
English (en)
Other versions
EP2251099A3 (fr
EP2251099B1 (fr
EP2251099B2 (fr
Inventor
Hartmut Pallmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hosokawa Alpine AG
Original Assignee
Pallmann Maschinenfabrik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of EP2251099A2 publication Critical patent/EP2251099A2/fr
Publication of EP2251099A3 publication Critical patent/EP2251099A3/fr
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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 and are often used as a downstream stage of view for the separation of coarse material from a gas-solid stream of an upstream process.
  • the upstream process can be carried out, for example, by means of a mill, a cyclone separator or a static or dynamic classifier.
  • plants are known in which the feedstock is fed to a first level of vision in the form of a basket sifter, where first the fines are removed from the feedstock. Particles that are rejected by the classifying 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 viewing zone of a second viewing stage.
  • the cylindrical viewing zone is concentrically surrounded by a ring channel, which is fed via a radially incoming air inlet with classifying air. Through openings in the wall between the cylindrical viewing zone and the annular channel, the classifying air enters the classifying zone, where it meets the flow of material coming from the inner cone.
  • the feed is subjected to a second sighting, with the fines being returned upwardly from the classifying air to the basket sifter while the coarse material, due to gravity, leaves the viewing area, where it is collected and withdrawn from time to time. It has been found, however, that the selectivity of the second stage of vision is not satisfactory, that is, that the grain size distribution of the fine material or coarse material still has too many shares of each other fraction.
  • the object of the invention is to further develop known classifiers with regard to the most exact possible adherence to a predetermined separation limit.
  • the invention is based on the finding that an imprecise selectivity is due to the fact that the classifying air does not enter the classifying zone over the entire course of the classifying zone at a uniform rate. Since the visual effect is based essentially on the dragging force exerted by the classifying air on the good particles, and the towing force in turn depends mainly on the flow velocity of the classifying air, larger particles of good material are entrained as fine material in regions with high flow velocity, while such particles are already present in regions of lower flow rate Grobgut be singled out. The separation limit therefore migrates as a function of the flow velocity, which leads to a blurred selectivity.
  • the invention is based on the assumption that, ideally, the quotient of the time-dependent volume flow of the classifying air and the area of the flow cross-section of the distributor channel should remain as constant as possible over the entire length of the distributor channel, in order to ensure a uniform flow velocity in the distributor channel and thus on entry into the viewing zone receive. Since the volume of the sifting air flow in the flow direction of the distributor channel decreases to the extent that sifting air enters the sifting zone, the speed loss observed in the prior art can be counteracted by the cross-section of the distributor channel becoming progressively smaller.
  • the speed losses are exactly compensated by corresponding reduction of the flow cross-section in the distributor channel, that is, the classifying air flows at the beginning of the distributor channel at the same speed into the viewing zone as at the end of the distributor channel or somewhere in between. This creates uniform output parameters for the viewing process over the entire viewing zone with the effect of a consistently high selectivity.
  • the reduction of the modusquerites the distribution channel is preferably achieved by reducing its radial extent, the distribution channel can be left in its height and thus does not significantly increase the design effort.
  • the reduction of the fürströmqueritess can be carried out in several stages, each extending over a peripheral portion of the distribution channel.
  • a continuous course of the outer circumferential wall of the distribution channel is preferred, for example, in that the outer circumferential wall spirally approximates the opposite circular zone wall delimiting the viewing zone.
  • the cylindrical wall between the viewing zone and distribution channel only has passage openings in an otherwise closed area
  • the partition is formed according to a particularly preferred embodiment of a plurality of air vanes, which are arranged along the circumference of the viewing zone.
  • the plate-like air guide vanes can connect tangentially with their rear end in the flow direction to the circular cylindrical circumference of the classifier zone, while its front end protrudes into the distribution channel.
  • the front ends of the air vanes form a kind of funnel which traps the view air flow and concentrates on the passage opening.
  • Preferred uses of devices according to the invention result in combination with a mill, for example a pen or racket mill, in which the milled material is to be divided into two fractions, or as a second view step after a static or dynamic classifier, such as a basket classifier If appropriate, the visible material rejected at the classifying wheel should be further dissolved and separated into fine material and coarse material, or in conjunction with a cyclone separator in order to increase its efficiency.
  • a mill for example a pen or racket mill
  • a static or dynamic classifier such as a basket classifier
  • the Fig. 1 and 2 show a device 1 according to the invention in the essential sections, the device 1 is integrated in the present embodiment in a two-stage screening process.
  • the first screening stage is formed by a basket sifter, of which only the lower housing part 2 with a cylindrical portion 3 and an inner cone 4 is shown. Furthermore, one sees the lower end of a fine material take-off 5.
  • the feed material 6 which still contains fines and coarse material fractions, flows downwards in the direction of the device 1 according to the invention, where in a second step an aftertreatment takes place.
  • the inventive device 1 has a substantially cylindrical housing 7 which extends coaxially along the axis 8 and connects upwardly to the inner cone 4 of the basket sifter.
  • a in cross-section rectangular and extending in a radial plane to the axis 8 distribution channel 9 is integrated, which is composed of a bottom ring plate 10, an axially spaced plan parallel opposite cover ring disc 11 and a two annular discs 10 and 11 respectively connecting inner wall 12th and outer wall 13.
  • Fig. 2 opens tangentially into the distribution channel 9, an inlet nozzle 14 for supplying the classifying air.
  • the arrows 15 symbolize the reformluftströmung within the distribution channel 9.
  • the outer wall 13 of the distribution channel 9 has with respect to the axis 8 a spiral shape, that is their distance from the axis 8 decreases in the flow direction 15.
  • the inner wall 12 surrounds the axis 8 concentric, which together leads to a reduction of the radial extension of the distribution channel 9 and causes a constant reduction of the fürströmqueritess in the flow direction 15 at the same axial height.
  • the inner wall 12 is made in a dissolved construction, that is, it is composed of a plurality of individual air vanes 16, which are arranged at a tangential distance from each other.
  • the air vanes 16 consist of flat plate-shaped elements whose opposite, axially extending end faces are chamfered and in this way form sharp edges 17 and 18.
  • the air guide vanes 16 are fastened in tangential alignment with the axis 8 with its lower edge on the bottom ring disk 10 and with its upper edge on the cover ring disk 11 of the feed channel 9.
  • the forward edges 15 in the flow direction 15 extend into the distribution channel 9, while the rear edges 18 have the smallest distance from the axis 8 and there connect tangentially to a common circumferential circle 31.
  • the last in the direction of flow 15 last air guide blade 16 ' is formed longer and closes with its front in the flow direction 15 close to the outer wall 13 of the distribution channel 9 so that it ends there and a circulation flow of the classifying air 15 is prevented.
  • a first air vane 16 in the flow direction 15 with the slope in the region of the front sharp edge 17 of the subsequent air guide blade 16 includes a funnel-shaped gap 20 in the flow direction 15 in one of the slope in Area of the rear sharp edge 18 of the first air guide blade 16 and the axis 8 facing inside 22 of the subsequent air guide blade 16 formed channel-shaped gap 21 merges with constant gap cross-section and causes a tangential orientation of the classifying air flow 15 'in this area.
  • the clearances between the guide vanes 16 extending along the peripheral circle 31 of the rear sharp edges 18 form passage openings 23 from the interior of the distributor channel 9 to a cylindrical viewing zone 24 enclosed by the inner wall 12.
  • the classifying air 15 'passes through the openings 23 tangentially into the viewing zone 24 and sweeps with an axial upward component helically over the entire inner circumference of the viewing zone 24 and meets the axially directed from the inner cone 4 downflow of the feed 6, which is also distributed as Gutschleier uniformly over the entire circumference of the viewing zone 24 ,
  • the housing 7 continues in a cylindrical coarse material outlet 26, which merges into a collecting cone 27 and whose lower end is closed by a discharge lock 28.
  • the function of a device is as follows.
  • the feed material is sighted in a first viewing stage, for example on a classifying wheel of a basket sifter, and a first portion of fines is withdrawn.
  • the rejected on the classifying wheel 6sistedgut 6 is further digested by the impact on the classifying wheel and due to turbulence-related collisions of the Gutp motherboard with each other, so that in the feed material 6 as before fine material and coarse material are subjected to increase the efficiency of the viewing process of a Nachsichtung.
  • the feed material 6 produced in the first view stage flows axially downwards along the inner cone 4 into the region of the viewing zone 24 of the device 1 according to the invention.
  • the device 1 used in the present example as grobgutsichter is fed by means of a blower, not shown, with classifying air 15, which passes through the inlet port 14 into the distribution channel 9.
  • a portion of the classifying air 15 is branched off from the air guide vanes 16 and passed through the openings 23 with the axis 8 tangential alignment through the openings 23 in the viewing zone 24 (arrow 15 ').
  • the flow cross section in the flow direction 15 decreases due to the spiral course of the outer wall 13, whereby otherwise occurring velocity losses of the classifying air flow 15 are compensated.
  • the speed of the classifying air 15 in Distribution channel 9 is thus constant over the entire circumference of the distribution channel 9 and thus also the entry velocity of the classifying air 15 'into the classifying zone 24.
  • the feed material 6 In the region of the visual zone 24, the feed material 6 thus encounters a uniform visual air flow 15 ', which flows helically upwards with a vertical component and thereby dissolves the fine material from the feed material 6 symbolized by the arrows 29 with a uniform drag force and delivers it to the fine material take-off 5 or returns to the basket sifter.
  • the gravity prevails over the drag force of the prepare for processing the feed material 6 .
  • the separation boundary between fines 29 and coarse material 30 can be adjusted by appropriate selection of the flow velocity of the classifying air 15 in the distribution channel 9.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
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 true EP2251099A2 (fr) 2010-11-17
EP2251099A3 EP2251099A3 (fr) 2012-08-08
EP2251099B1 EP2251099B1 (fr) 2013-08-21
EP2251099B2 EP2251099B2 (fr) 2022-12-28

Family

ID=42537653

Family Applications (1)

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

Country Status (2)

Country Link
EP (1) EP2251099B2 (fr)
DE (1) DE102009020713A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106892284A (zh) * 2017-04-11 2017-06-27 苏州尚梵斯科技有限公司 粮食谷物筛分农机设备及其工作方法

Family Cites Families (6)

* 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
JPS5624528Y2 (fr) * 1977-11-18 1981-06-09
US4551241A (en) * 1984-02-08 1985-11-05 Sturtevant, Inc. Particle classifier
DE3508889C1 (de) † 1985-03-13 1992-02-20 Alpine Ag, 8900 Augsburg Windsichter mit verschleissfreiem Sichtrad
DE3943733C2 (de) * 1989-05-12 1999-01-21 Canon Kk Vorrichtung und Verfahren zur Zerkleinerung und Klassierung von Pulver in Feinpulver
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106892284A (zh) * 2017-04-11 2017-06-27 苏州尚梵斯科技有限公司 粮食谷物筛分农机设备及其工作方法
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

Also Published As

Publication number Publication date
EP2251099A3 (fr) 2012-08-08
DE102009020713A1 (de) 2010-11-18
EP2251099B1 (fr) 2013-08-21
EP2251099B2 (fr) 2022-12-28

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