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EP1086753A1 - Pneumatic separator - Google Patents

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Publication number
EP1086753A1
EP1086753A1 EP00116372A EP00116372A EP1086753A1 EP 1086753 A1 EP1086753 A1 EP 1086753A1 EP 00116372 A EP00116372 A EP 00116372A EP 00116372 A EP00116372 A EP 00116372A EP 1086753 A1 EP1086753 A1 EP 1086753A1
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EP
European Patent Office
Prior art keywords
expansion housing
air
cover plate
classifying
air classifier
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
EP00116372A
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German (de)
French (fr)
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EP1086753B1 (en
Inventor
Herbert Dipl.-Ing. Horlamus
Wolfgang Dipl.-Ing. Jehle
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.)
Gebr Bauermeister & Co Verfahrenstechnik & Co GmbH
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Gebr Bauermeister & Co Verfahrenstechnik & Co GmbH
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    • 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
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements

Definitions

  • the invention relates to an air classifier according to the preamble of claim 1.
  • bucket wheel classifiers Classifiers In such, usually referred to as bucket wheel classifiers Classifiers, flows through the fine air loaded with fine material the bladed rotor, i.e. the classifying wheel, from the outside inside and leaves through a central discharge opening in the corresponding front wall.
  • the separation limit depends on the speed of the rotor and the volume flow of the penetrated Gases off. The higher the speed and the lower the gas flow, the finer the cut.
  • Such air classifiers have such fine classifications considerable pressure drops and thus a high specific one Energy requirement because, as I said, high rotor speeds required are.
  • the rotors are small Discharge openings (approx. 0.5 x rotor diameter) because with the same speed and the same gas volume flow smaller diameter of the discharge opening a finer Parting cut can be achieved. This is an advantage if for mechanical reasons the rotor speed is not further increased or for procedural reasons the The amount of gas cannot be reduced. The smaller the diameter the discharge opening is selected, the higher - depending on the rotor speed - the air or gas speed and with it the pressure loss, if there is this speed energy does not succeed again partially recover as pressure energy.
  • the invention is based on the object of an air classifier to create of the type mentioned, in which also In the case of fine sightings, the lowest possible pressure losses occur.
  • part of the wall of the expansion housing is formed by the corresponding adjacent end wall, ie the cover disk of the classifying wheel, which therefore rotates with the classifying wheel.
  • a corresponding opening is provided in the stationary wall of the expansion housing, in which the rotating cover plate lies with the discharge opening.
  • the annular gap between these two parts rotating relative to one another is supplied with purge air in order to counteract a short circuit between the visible space and the expansion housing.
  • the pneumatic seal is advantageously designed as specified in claim 2.
  • the expansion housing is designed in a manner known per se as stated in claim 4.
  • This air classifier consists of a visual space 7, in which the Sight wheel 1 protrudes and by a motor, not shown is driven, the thyristor-controlled continuously variable speed is.
  • the upper end wall of the classifying wheel 1 is a cover plate 5 formed with a central discharge opening 2.
  • This Cover plate 5 lies in an opening of the upper wall 8 of the Visible space 7. Between the circumferential cover plate 5 and the wall 8 remains an annular gap, that of a nozzle 9 purge air is supplied.
  • the wall is 8 double-walled.
  • the expansion housing 3 On top of wall 8, i.e. on the side of the wall 8 which faces away from the viewing space 7 is the expansion housing 3, which as a spiral housing with outlet channel 4 is formed, which is substantially perpendicular to the axis of rotation the classifying wheel 1 is arranged.
  • the Cover disc 5 On top of the Cover disc 5 are in the expansion housing 3 fan blades 10, the gas flow additional kinetic Supply energy.
  • Air L with feed material A is located in the viewing space 7, which enters the sight wheel 1 from the outside inwards. From the air outlet L 4 is with fine material F loaded. The purge air that enters the nozzle 9 is marked with S. The coarse material G leaves the viewing space 7 a discharge opening, not shown, in the lower part.

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  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Sifting air charged with fine material flows radially from outside in against centrifugal force through a sifting wheel (1) rotating in a sifting chamber (7). The sifting air flows out of the sifting wheel axially through a discharge opening (2) into an expansion housing (3). A cover plate (5) with this discharge opening forms a dividing wall (8) in the expansion housing.

Description

Die Erfindung betrifft einen Windsichter nach dem Oberbegriff des Anspruches 1.The invention relates to an air classifier according to the preamble of claim 1.

Bei derartigen, meist als Schaufelradsichter bezeichneten Klassierern, durchströmt die mit Feingut beladene Sichtluft den beschaufelten Rotor, d.h. das Sichtrad, von außen nach innen und verläßt diesen durch eine zentrale Austragsöffnung in der entsprechenden Stirnwand. Die Trenngrenze hängt von der Drehzahl des Rotors und von dem Volumenstrom des durchgesetzten Gases ab. Je höher die Drehzahl und je geringer der Gasstrom, desto feiner der Trennschnitt.In such, usually referred to as bucket wheel classifiers Classifiers, flows through the fine air loaded with fine material the bladed rotor, i.e. the classifying wheel, from the outside inside and leaves through a central discharge opening in the corresponding front wall. The separation limit depends on the speed of the rotor and the volume flow of the penetrated Gases off. The higher the speed and the lower the gas flow, the finer the cut.

Bei Fein- und Feinstklassierungen haben derartige Windsichter beachtliche Druckverluste und damit einen hohen spezifischen Energiebedarf, da, wie gesagt, hohe Rotordrehzahlen erforderlich sind. Zusätzlich werden die Rotoren mit kleinen Austragsöffnungen (ca. 0,5 x Rotordurchmesser) ausgestattet, da bei gleicher Drehzahl und gleichem Gasvolumenstrom mit kleinerem Durchmesser der Austragsöffnung ein feinerer Trennschnitt erreicht werden kann. Dieses ist dann von Vorteil, wenn aus mechanischen Gründen die Rotordrehzahl nicht weiter erhöht bzw. aus verfahrenstechnischen Gründen die Gasmenge nicht reduziert werden kann. Je kleiner der Durchmesser der Austragsöffnung gewählt wird, desto höher wird - abhängig von der Rotordrehzahl - die Luft bzw. die Gasgeschwindigkeit und damit auch der Druckverlust, sofern es nicht gelingt, diese Geschwindigkeitsenergie wieder teilweise als Druckenergie zurückzugewinnen.Such air classifiers have such fine classifications considerable pressure drops and thus a high specific one Energy requirement because, as I said, high rotor speeds required are. In addition, the rotors are small Discharge openings (approx. 0.5 x rotor diameter) because with the same speed and the same gas volume flow smaller diameter of the discharge opening a finer Parting cut can be achieved. This is an advantage if for mechanical reasons the rotor speed is not further increased or for procedural reasons the The amount of gas cannot be reduced. The smaller the diameter the discharge opening is selected, the higher - depending on the rotor speed - the air or gas speed and with it the pressure loss, if there is this speed energy does not succeed again partially recover as pressure energy.

Bekannte Schaufelradsichter führen die Sichtluft mittels Rohrstutzen aus dem Sichtrad ab. Dieser Rohrstutzen ist über eine mehr oder weniger lange Strecke achsgleich mit der Drehachse des Rotors. Es ist auch bekannt, die Rohrstutzen teilweise in das Sichtrad hineinzuführen. Unabhängig davon, ob diese Rohrstutzen drehfest mit dem Sichtrad verbunden sind oder stillstehen, wird in ihnen ein großer Teil der Umfangsgeschwindigkeit infolge Reibung vernichtet. Grundsätzlich verhalten sich bezüglich Druckverlust solche Windsichter günstiger, bei denen die den Rotor verlassende Luft in ein Expansionsgehäuse, das vorzugsweise als flaches Spiralgehäuse ausgebildet ist, abströmt. Das Spiralgehäuse ermöglicht eine teilweise Rückgewinnung der kinetischen Energie. Der dem Rotor zugewandte Boden des Spiralgehäuses weist bei diesen bekannten Windsichtern eine Eintrittsöffnung auf, die deckungsgleich mit der Austragsöffnung angeordnet ist. Auch bei dieser Ausgestaltung führen die stillstehenden Wände und Boden zu einer vermehrten Reibung und damit einem erhöhten Druckverlust.Known bucket wheel classifiers guide the classifying air by means of From the sight wheel. This pipe socket is over a more or less long distance coaxially with the Axis of rotation of the rotor. It is also known the pipe socket partially into the classifying wheel. Independently of, whether these pipe sockets are non-rotatably connected to the classifying wheel are or stand still, a large part of the peripheral speed becomes in them destroyed due to friction. Basically behave with respect to pressure loss such air classifiers cheaper, where the air leaving the rotor in an expansion housing, preferably as a flat spiral housing is formed, flows out. The spiral housing enables partial recovery of kinetic energy. The bottom of the volute housing facing the rotor has these well-known wind sifters on an inlet that is coincident with the discharge opening. Also in this configuration, the stationary walls and Soil to an increased friction and thus an increased Pressure loss.

Der Erfindung liegt nun die Aufgabe zugrunde, einen Windsichter der eingangs genannten Art zu schaffen, bei dem auch bei Feinstsichtungen möglichst geringe Druckverluste auftreten.The invention is based on the object of an air classifier to create of the type mentioned, in which also In the case of fine sightings, the lowest possible pressure losses occur.

Diese Aufgabe wird grundsätzlich durch das Kennzeichen des Anspruches 1 gelöst.This task is fundamentally characterized by the Claim 1 solved.

Erfindungsgemäß wird also ein Teil der Wand des Expansionsgehäuses durch die entsprechende angrenzende Stirnwand, d.h. die Deckscheibe des Sichtrades, gebildet, die also mit dem Sichtrad rotiert. In der ortsfesten Wand des Expansionsgehäuses ist eine entsprechende Öffnung vorgesehen, in der die rotierende Deckscheibe mit der Austragsöffnung liegt. Der Ringspalt zwischen diesen beiden relativ zueinander rotierenden Teilen wird mit Spülluft versorgt, um einem Kurzschluß zwischen Sichtraum und Expansionsgehäuse entgegenzuwirken. Hierdurch wird sogenanntes

Figure 00030001
Spritzkorn" vermieden, d.h. es wird verhindert, daß Teilchen, die eigentlich gröber sind als die durch das Sichtrad eingestellte Trennkorngröße in die Feingutseite gelangen.According to the invention, part of the wall of the expansion housing is formed by the corresponding adjacent end wall, ie the cover disk of the classifying wheel, which therefore rotates with the classifying wheel. A corresponding opening is provided in the stationary wall of the expansion housing, in which the rotating cover plate lies with the discharge opening. The annular gap between these two parts rotating relative to one another is supplied with purge air in order to counteract a short circuit between the visible space and the expansion housing. As a result, so-called
Figure 00030001
Spray grain "avoided, ie it is prevented that particles that are actually coarser than the separating grain size set by the classifying wheel get into the fine material side.

Die pneumatische Dichtung" ist in vorteilhafter Weise so ausgebildet wie in Anspruch 2 angegeben.The pneumatic seal "is advantageously designed as specified in claim 2.

In an sich bekannter Weise ist das Expansionsgehäuse so gestaltet wie in Anspruch 4 angegeben.The expansion housing is designed in a manner known per se as stated in claim 4.

Wenn der Windsichter so ausgestaltet ist wie in Anspruch 6 angegeben, dann kann zusätzliche kinetische Energie im Gasstrom in dem Expansionsgehäuse zugeführt werden.If the air classifier is designed as in claim 6 specified, then additional kinetic energy in the Gas flow can be supplied in the expansion housing.

In der Zeichnung ist schematisch eine Ausführungsform eines Windsichters nach der Erfindung im Schnitt dargestellt.In the drawing, an embodiment of a Air classifier according to the invention shown in section.

Dieser Windsichter besteht aus einem Sichtraum 7, in dem das Sichtrad 1 hineinragt und durch einen nicht gezeigten Motor angetrieben wird, der thyristorgesteuert stufenlos drehzahlgeregelt ist.This air classifier consists of a visual space 7, in which the Sight wheel 1 protrudes and by a motor, not shown is driven, the thyristor-controlled continuously variable speed is.

Die obere Stirnwand des Sichtrades 1 ist als Deckscheibe 5 mit einer zentrischen Austragsöffnung 2 ausgebildet. Diese Deckscheibe 5 liegt in einer Öffnung der oberen Wand 8 des Sichtraumes 7. Zwischen der umlaufenden Deckscheibe 5 und der Wand 8 bleibt ein Ringspalt frei, dem über einen Stutzen 9 Spülluft zugeführt wird. Zu diesem Zweck ist die Wand 8 doppelwandig ausgebildet.The upper end wall of the classifying wheel 1 is a cover plate 5 formed with a central discharge opening 2. This Cover plate 5 lies in an opening of the upper wall 8 of the Visible space 7. Between the circumferential cover plate 5 and the wall 8 remains an annular gap, that of a nozzle 9 purge air is supplied. For this purpose, the wall is 8 double-walled.

Auf der Oberseite der Wand 8, d.h. auf der Seite der Wand 8 die dem Sichtraum 7 abgewandt ist, befindet sich das Expansionsgehäuse 3, das als Spiralgehäuse mit Austrittskanal 4 ausgebildet ist, das im wesentlichen senkrecht zur Drehachse des Sichtrades 1 angeordnet ist. Auf der Oberseite der Deckscheibe 5 befinden sich in dem Expansionsgehäuse 3 Ventilatorflügel 10, die dem Gasstrom zusätzliche kinetische Energie zuführen.On top of wall 8, i.e. on the side of the wall 8 which faces away from the viewing space 7 is the expansion housing 3, which as a spiral housing with outlet channel 4 is formed, which is substantially perpendicular to the axis of rotation the classifying wheel 1 is arranged. On top of the Cover disc 5 are in the expansion housing 3 fan blades 10, the gas flow additional kinetic Supply energy.

In dem Sichtraum 7 befindet sich Luft L mit Aufgabegut A, die in das Sichtrad 1 von außen nach innen eintritt. Die aus dem Austrittskanal 4 austretende Luft L ist mit Feingut F beladen. Die Spülluft, die in den Stutzen 9 eintritt, ist mit S bezeichnet. Das Grobgut G verläßt den Sichtraum 7 über eine nicht dargestellte Austragsöffnung im unteren Teil.Air L with feed material A is located in the viewing space 7, which enters the sight wheel 1 from the outside inwards. From the air outlet L 4 is with fine material F loaded. The purge air that enters the nozzle 9 is marked with S. The coarse material G leaves the viewing space 7 a discharge opening, not shown, in the lower part.

Claims (6)

Windsichter mit einem entgegen der Fliehkraft radial von außen nach innen von der feingutbeladenen Sichtluft durchströmten, in einer Sichtkammer (7) rotierenden Sichtrad (1), aus dem die Sichtluft axial durch eine Austragsöffnung (2) in einer Deckscheibe (5) in ein Expansiongehäuse (3) abströmt, dadurch gekennzeichnet, daß die Deckscheibe (5) mit ihrer Austragsöffnung (2) gleichzeitig die angrenzende Wand (8) des Expansionsgehäuses (3) bildet, daß
in den Ringspalt (6) zwischen der Wand (8) des Expansionsgehäuses (3) und der Deckscheibe (5) Spülluft eingeblasen wird.Air classifier with a classifying wheel (1) rotating in a classifying chamber (7) rotating classifying wheel (1) from which the classifying air flows axially through a discharge opening (2) in a cover plate (5) into an expansion housing ( 3) flows out, characterized in that the cover plate (5) with its discharge opening (2) simultaneously forms the adjacent wall (8) of the expansion housing (3) that
Purge air is blown into the annular gap (6) between the wall (8) of the expansion housing (3) and the cover plate (5). Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß die Wand (8) des Expansionsgehäuses (3) doppelwandig zum Einblasen der Spülluft ausgebildet ist.Air classifier according to claim 1, characterized in that the wall (8) of the expansion housing (3) is double-walled is designed for blowing in the purge air. Windsichter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Austrittskanal (4) des Expansionsgehäuses (3) im wesentlichen senkrecht der Drehachse des Sichtrades (1) verläuft.Air classifier according to claim 1 or 2, characterized in that the outlet channel (4) of the expansion housing (3) substantially perpendicular to the axis of rotation of the Classifying wheel (1) runs. Windsichter nach Anspruch 3, dadurch gekennzeichnet, daß das Expansionsgehäuse (3) als Spiralgehäuse ausgebildet ist.Air classifier according to claim 3, characterized in that the expansion housing (3) is designed as a spiral housing is. Windsichter nach Anspruch 4, dadurch gekennzeichnet, daß der größte Radius des Spiralgehäuses ungefähr das zweifache des Radius der Deckscheibe (5) des Sichtrades (1) beträgt.Air classifier according to claim 4, characterized in that the largest radius of the volute is about that twice the radius of the cover disc (5) of the classifying wheel (1) is. Windsichter nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, daß auf der Deckscheibe (5) des Sichtrades (1) in dem Expansionsgehäuse (3) Ventilatorflügel (10) vorgesehen sind.Air classifier according to one or more of the above Claims, characterized in that on the cover plate (5) of the classifying wheel (1) in the expansion housing (3) Fan blades (10) are provided.
EP00116372A 1999-09-23 2000-07-28 Pneumatic separator Expired - Lifetime EP1086753B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19947862 1999-09-23
DE19947862A DE19947862A1 (en) 1999-09-23 1999-09-23 Air classifier

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EP1086753A1 true EP1086753A1 (en) 2001-03-28
EP1086753B1 EP1086753B1 (en) 2004-11-10

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AT (1) ATE281894T1 (en)
DE (2) DE19947862A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2936171A1 (en) * 2008-09-19 2010-03-26 Broyeurs Poittemill Ingenierie Fine particles e.g. loam particles, selector for use with crusher, has turbine whose downstream part is provided at opening's lower plane or situated in opening and projected outside chamber relative to circulation direction of particles

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008038776B4 (en) * 2008-08-12 2016-07-07 Loesche Gmbh Process for the screening of a millbase fluid mixture and mill classifier
CN109201483A (en) * 2017-06-30 2019-01-15 四川丰能粉体设备有限公司 A kind of new type of airflow pulverizing grading machine
DE102017120033B4 (en) 2017-08-31 2024-02-08 Siempelkamp Maschinen- Und Anlagenbau Gmbh Device for separating and/or recovering silicate particles from plant material
CN116020743B (en) * 2022-12-22 2025-02-11 中建材创新科技研究院有限公司 A wind selector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2269412A (en) * 1940-07-18 1942-01-06 Sturtevant Mill Co Air separator
DE19505466A1 (en) * 1995-02-17 1996-08-22 Krupp Polysius Ag Wind sifter for grains of fine material
EP0734787A1 (en) * 1995-03-28 1996-10-02 OMYA GmbH Mounting of the shaft in a centrifugal sifter
WO1996031294A1 (en) * 1995-04-07 1996-10-10 Sinvent A/S Apparatus for classification of particulate material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2269412A (en) * 1940-07-18 1942-01-06 Sturtevant Mill Co Air separator
DE19505466A1 (en) * 1995-02-17 1996-08-22 Krupp Polysius Ag Wind sifter for grains of fine material
EP0734787A1 (en) * 1995-03-28 1996-10-02 OMYA GmbH Mounting of the shaft in a centrifugal sifter
WO1996031294A1 (en) * 1995-04-07 1996-10-10 Sinvent A/S Apparatus for classification of particulate material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2936171A1 (en) * 2008-09-19 2010-03-26 Broyeurs Poittemill Ingenierie Fine particles e.g. loam particles, selector for use with crusher, has turbine whose downstream part is provided at opening's lower plane or situated in opening and projected outside chamber relative to circulation direction of particles

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Publication number Publication date
ATE281894T1 (en) 2004-11-15
DE50008577D1 (en) 2004-12-16
DE19947862A1 (en) 2001-03-29
EP1086753B1 (en) 2004-11-10

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