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EP0332031A2 - Séparateur pneumatique à zigzag - Google Patents

Séparateur pneumatique à zigzag Download PDF

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Publication number
EP0332031A2
EP0332031A2 EP89103544A EP89103544A EP0332031A2 EP 0332031 A2 EP0332031 A2 EP 0332031A2 EP 89103544 A EP89103544 A EP 89103544A EP 89103544 A EP89103544 A EP 89103544A EP 0332031 A2 EP0332031 A2 EP 0332031A2
Authority
EP
European Patent Office
Prior art keywords
zigzag
air
channels
channel
classifier according
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
EP89103544A
Other languages
German (de)
English (en)
Other versions
EP0332031B1 (fr
EP0332031A3 (fr
Inventor
Hans Dr. Uhlemann
Heiko Dipl.-Ing. Herold
Reinhard Boeck
Hans Daun
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.)
Bayer AG
Original Assignee
Bayer AG
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.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0332031A2 publication Critical patent/EP0332031A2/fr
Publication of EP0332031A3 publication Critical patent/EP0332031A3/fr
Application granted granted Critical
Publication of EP0332031B1 publication Critical patent/EP0332031B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B07B4/04—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall in cascades

Definitions

  • the invention relates to a zigzag classifier with a classifying room and the associated air supply devices.
  • the throughput through such a sifter increases with its cross-sectional area, which, however, changes with regard to a uniform flow of sifting air, a more uniform material distribution, the thickness of the material layer and others. cannot be enlarged arbitrarily. If more kinks are provided to compensate for such irregularities, however, dimensioning the classifier and mastering the correct dimensions becomes problematic. This is particularly disadvantageous if the classifier is used with other equipment, e.g. should be combined with a fluidized bed spray granulator (see e.g. EP 163 836) to form a process engineering unit.
  • an airbed classifier For the dedusting of granular material at high throughputs, an airbed classifier was also developed, which e.g. is described in DE 1 507 686.
  • This classifier combines a strongly fluidized fluidized bed with a system of parallel zigzag channels arranged above it. The feed bed moves through the fluidized bed in such a way that coarse material emerges from the bed at the end. The fine material is checked for its grain size in the zigzag channels and, if the size falls below a predetermined limit, is transferred from the classifying air to a separator. The coarse grain, on the other hand, falls back into bed.
  • multi-channel zigzag sifters are on the market, in which the material to be sifted is evenly fed to the channels via a distributor screw.
  • the classifying air flows undosed to the parallel channels.
  • classifiers may only be operated with a low solids load.
  • the invention has for its object to improve the principle of zigzag screening so that a classifier with the lowest possible height and high selectivity can be realized.
  • the visual space is divided into zigzag channels connected in parallel in terms of flow technology, the length l of which is greater than its width b.
  • the length l is preferably greater than twice the width b.
  • This construction principle allows significantly lower construction heights with the same number of kinks.
  • the number of kinks for one and the same desired separation result can also be reduced because the thickness of the material layer to be sifted is so small that a significantly better screening process takes place at the individual kinks.
  • Preconditions for the division of the viewing space into a plurality of parallel channels are precautions which ensure that all channels are supplied with visual air evenly and independently of the respective loading of the channel by solid material.
  • the principle of "sound chokes” is advantageously used.
  • “Sound restrictors” are pinholes that in their work area, the visual air flows through them at sound speeds. Therefore, regardless of the pressure behind the pinhole, an amount of air flows through it, which is only determined by the hole cross section and the pressure in front of the pinhole. If, according to a preferred embodiment of the invention, a sound throttle is assigned to each viewing duct, then all ducts have the same air throughput with the same cross section of the perforated screens. Since the parallel viewing channels are all fed from the same collecting channel, the pressure in the collecting channel can be used to vary the viewing air flow rate of all channels evenly.
  • the cross sections of the channels are advantageously so narrowed below the feed point for the classifying air that the coarse grain of the desired size can just barely fall out of the classifying channel. Due to the particles falling out, the narrowing of the cross-section is fluidically increased the more particles pass the constriction. However, this leads to the desired stabilization of the flow distribution.
  • the constriction is given the shape of a zigzag channel.
  • zigzag channels have a particularly high resistance coefficient, which even exceeds that of labyrinth seals.
  • a control device At the lower end, where all parallel sifter channels open into a common space, a control device must be provided in the zigzag sifter according to the invention, which maintains such pressure in this space that no sifting air flows out of the channels downwards, but also no air from the surroundings is sucked in by the ducts. This is achieved by a corresponding regulation for the extraction of the classifier exhaust air.
  • the zigzag sifter shown schematically in Fig. 1 consists of a housing 1 with a collecting space 2 for the discharged material with the desired grain size, the zigzag sifter package and the air distribution channel 4 for the supply of the sifting air.
  • the zigzag sifter package consists of a plurality of vertically arranged, fluidically parallel zigzag channels 5 with attached return shafts 6. Through the return shafts 6, the undersize may be thrown back into a material bed. They can have smooth or zigzag channel walls.
  • the classifying air is fed to the air distribution pipe via a diaphragm or throttle (sound throttle) 11 through which the speed of sound flows (see also description of FIG. 3).
  • labyrinths zigzag-shaped narrow points
  • the labyrinth 12 ultimately serves to improve the selectivity when a different solids loading is to be expected in the classifier channels 5 and different pressure distributions result from this.
  • the constrictions 12 counteract flow instabilities which result from such different pressure distributions.
  • the air supply to the air distribution pipes 9 can be seen from FIG. 3.
  • the sifting air flows for the channels 5 are branched off in parallel from the air distribution channel 4.
  • Due to the arranged in the individual feeds to the air distribution pipes 9 throttles 11 ensures that in each air distribution pipe 9, regardless of the pressure behind the sound throttle, an amount of air flows that is determined only by the cross section and the pressure in front of the sound throttle. With the same cross section of the sound restrictors, the air throughput for all classifier channels is also the same.
  • the extraction for the classifier exhaust air is provided with a control device which ensures that ambient pressure prevails in the collection space 2.
  • the material viewed is discharged from the collecting space 2 through a rotary valve 13.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
EP89103544A 1988-03-11 1989-03-01 Séparateur pneumatique à zigzag Expired - Lifetime EP0332031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808116A DE3808116A1 (de) 1988-03-11 1988-03-11 Zick-zack-sichter
DE3808116 1988-03-11

Publications (3)

Publication Number Publication Date
EP0332031A2 true EP0332031A2 (fr) 1989-09-13
EP0332031A3 EP0332031A3 (fr) 1991-07-31
EP0332031B1 EP0332031B1 (fr) 1994-01-26

Family

ID=6349469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103544A Expired - Lifetime EP0332031B1 (fr) 1988-03-11 1989-03-01 Séparateur pneumatique à zigzag

Country Status (4)

Country Link
US (1) US4931174A (fr)
EP (1) EP0332031B1 (fr)
JP (1) JP2753848B2 (fr)
DE (2) DE3808116A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961707A (en) * 1997-04-09 1999-10-05 Haarmann & Reimer Gmbh Alcohol-containing granules
EP1958520A2 (fr) 2007-02-09 2008-08-20 Symrise GmbH & Co. KG Granulés de lit fluidisé ayant une teneur élevée en fruit
CN110074448A (zh) * 2019-06-19 2019-08-02 常德烟草机械有限责任公司 一种梗丝分选装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213820A (en) * 1984-02-27 1993-05-25 Bayer Aktiengesellschaft Process and device for fluidized bed spray granulation
DE4200821A1 (de) * 1992-01-15 1993-07-22 Bayer Ag Geschmacksmaskierte pharmazeutische mittel
DE4304405A1 (de) * 1993-02-15 1994-08-18 Bayer Ag Verfahren zur kontinuierlichen Wirbelschichtagglomeration
US6213307B1 (en) * 1995-11-15 2001-04-10 Grana Inc. Fluid-bed cleaner and grades sorter for particle form materials
CN1590249B (zh) * 2003-06-19 2010-09-29 豪尼机械制造股份公司 分配器装置中用于筛分产品流的筛选器
DE102010007593A1 (de) * 2010-02-04 2011-08-04 Hauni Maschinenbau AG, 21033 Sichtmittel zum Sichten eines Produktstroms innerhalb einer Verteilervorrichtung
DE102013215062A1 (de) * 2013-07-31 2015-02-05 Krones Ag Zick-Zack-Sichter zum Separieren von Trenngut, beispielsweise Kunststoffflocken, und Verfahren zum Separieren von Trenngut, beispielsweise Kunststoffflocken, mittels eines Zick-Zack-Sichters

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1861248A (en) * 1930-01-03 1932-05-31 Albert H Stebbins Air classifier
DE1135841B (de) * 1960-06-09 1962-09-06 Dr Theodor Eder Verfahren und Vorrichtung zum Trennen koernigen Gutes in wenigstens zwei Endfraktionen
DE1407846A1 (de) * 1961-06-15 1969-04-10 Alpine Ag Anwendung des Steigrohrwindsichters nach Patent 1270380 in der Getreidewirtschaft
DE1507686B1 (de) * 1966-04-06 1972-05-25 Alpine Ag Steigrohr-Windsichter
NL136425C (fr) * 1966-07-11
US3876419A (en) * 1970-07-06 1975-04-08 Lev Petrovich Brusov Method of thermal and chemical treatment of solids of starting material not over 0.5 mm in size
DE2341363C3 (de) * 1973-08-16 1979-05-31 Kali-Chemie Ag, 3000 Hannover Verfahren zur Herstellung eines Katalysators zur Zersetzung von Hydrazin und seinen Derivaten
US3925198A (en) * 1975-01-29 1975-12-09 Univ Utah Apparatus and method of air classifying municipal solid wastes
DE2641068A1 (de) * 1976-09-11 1978-03-16 Alpine Ag Steigrohrwindsichter zur entsandung von holzspaenen
DE2804548A1 (de) * 1978-02-03 1979-08-09 Krauss Maffei Ag Verfahren und vorrichtung zum trennen feuchten papiers von muell
US4235707A (en) * 1979-04-09 1980-11-25 Burke, Davoud & Associates Method and apparatus for treating solid municipal refuse and other cellulose containing material
JPS5616227U (fr) * 1979-07-11 1981-02-12
SU906633A1 (ru) * 1980-06-20 1982-02-23 Всесоюзный Научно-Исследовательский Институт Деревообрабатывающей Промышленности Устройство дл сортировки древесных частиц
SU1265002A1 (ru) * 1984-02-03 1986-10-23 Уральский политехнический институт им.С.М.Кирова Пневматический многоколонный классификатор
EP0163836B1 (fr) * 1984-04-07 1988-10-12 Bayer Ag Procédé et dispositif pour la production de granulés
SU1268212A1 (ru) * 1985-06-17 1986-11-07 Научно-исследовательский институт прикладной математики и механики при Томском государственном университете Воздушный сепаратор
AT386362B (de) * 1986-08-13 1988-08-10 Uralsky Politekhn Inst Schwerkraft-windsichter zum trennen von schuettstoffen
JPS6311067A (ja) * 1987-06-25 1988-01-18 Victor Co Of Japan Ltd 直流高電圧発生装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961707A (en) * 1997-04-09 1999-10-05 Haarmann & Reimer Gmbh Alcohol-containing granules
EP1958520A2 (fr) 2007-02-09 2008-08-20 Symrise GmbH & Co. KG Granulés de lit fluidisé ayant une teneur élevée en fruit
CN110074448A (zh) * 2019-06-19 2019-08-02 常德烟草机械有限责任公司 一种梗丝分选装置

Also Published As

Publication number Publication date
DE58906793D1 (de) 1994-03-10
JP2753848B2 (ja) 1998-05-20
EP0332031B1 (fr) 1994-01-26
DE3808116A1 (de) 1989-09-21
US4931174A (en) 1990-06-05
JPH01274880A (ja) 1989-11-02
EP0332031A3 (fr) 1991-07-31

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