EP2142312B1 - Apparatus and method for sifting feedstock including grinding mill - Google Patents

Apparatus and method for sifting feedstock including grinding mill Download PDF

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Publication number
EP2142312B1
EP2142312B1 EP08750058A EP08750058A EP2142312B1 EP 2142312 B1 EP2142312 B1 EP 2142312B1 EP 08750058 A EP08750058 A EP 08750058A EP 08750058 A EP08750058 A EP 08750058A EP 2142312 B1 EP2142312 B1 EP 2142312B1
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EP
European Patent Office
Prior art keywords
rotor
static
sifting
sifter
dynamic
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Not-in-force
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EP08750058A
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German (de)
French (fr)
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EP2142312A2 (en
Inventor
Christoph Mendelin
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ThyssenKrupp Industrial Solutions AG
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ThyssenKrupp Polysius AG
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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
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • 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
    • 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 static-dynamic sifter for sifting feedstock with a static sifter having a vented bottom oriented obliquely to the vertical, through which viewing gas flows, and a downstream dynamic sifter comprising at least one rotor with a horizontal rotor axis.
  • a grinding plant according to the preamble of claim 1 is known in which a static classifier is operated directly in front of a dynamic classifier and as a mill, a good bed roller mill and / or tube mill is used.
  • This type of static-dynamic classifier has proven itself for certain tasks.
  • the feed material reaches the ventilation base of the static separator via feeders (conveyor belts / chutes) and then slides downwards over the ventilation floor.
  • the view air flowing through the feed material in cross flow carries the fines to the dynamic sifter, while the coarse material of the static sifter is discharged by gravity at the lower outlet.
  • the fineness of the fine material of the static classifier can be influenced.
  • the desired product fineness is set via the visual flow rate and the speed of the rotor.
  • the classifying air should flow substantially tangentially to the rotor in order to support the centrifugal field built up by the rotor.
  • the tangential flow is achieved by a spiral configuration of the housing surrounding the dynamic classifier in combination with a dynamically arranged rotor eccentrically arranged therewith.
  • the resulting flow conditions are, for example, from the DE 103 50 518 A1 to see.
  • the centrifugal force acting on the particles and the direction of the Rotor's acting drag of the classifying air separates the feed material of the dynamic classifier into product and coarse material.
  • an air classifier in whose viewing space at least two rod baskets are arranged one above the other in two planes perpendicular to the viewing space axis, which are operated in opposite directions of rotation.
  • the describes DE 103 61 609 A1 a classifying rotor with flow channels through which flow from outside to inside between radially directed rotor blades, wherein the classifying rotor rotates counter to the tangentially incoming classifying air.
  • the invention is based on the object of improving the visual efficiency of a static-dynamic classifier.
  • baffles are provided in the region between the static and the dynamic classifier for optimizing the tangential flow of the rotor, wherein at least one of the baffles can be arranged adjustable.
  • peripheral speed of the rotor is significantly increased over conventional operation, with a peripheral speed in the range of 15 to 35 m / s, preferably in the range of 20 to 30 m / s. s is considered particularly advantageous.
  • the above-described static-dynamic classifier for sifting is particularly suitable in a grinding plant with a mill.
  • the static sifter may at least partially serve to dissolve or deagglomerate the slugs coming out of the good bed roller mill.
  • the in Fig. 1 illustrated static-dynamic classifier 100 for sifting of feed material 1 consists essentially of a static classifier 2, which has an obliquely oriented to the vertical, by the sighting gas 3 flowed through ventilation base 4 and a downstream dynamic classifier 5, the at least one rotor 6 with horizontal rotor axis includes.
  • the static classifier 2 and the dynamic classifier 5 are arranged in a housing 8, which has an inlet opening 9 for discharging the feed material 1 on the ventilation floor 4 and an outlet opening 10 for the coarse material. Furthermore, an outlet opening 11 is provided for the laden with fines sighting gas.
  • the area of the housing 8 surrounding the dynamic classifier 5 is designed as a housing spiral, so that a substantially tangential flow of the rotor results (see arrows 12, 13).
  • the loading gas laden with fines thus flows in the illustrated embodiment, in a substantially clockwise direction in the housing spiral.
  • the direction of rotation 14 of the rotor 6 is opposite to the flow direction (arrows 12, 13) of the classifying gas into the housing spiral, ie the rotor rotates in the illustration according to FIG Fig. 1 counterclockwise.
  • the rotor 6 has rotor blades which are set to have an angle ⁇ of 10 to 50 °, preferably 25 to 35 ° to the radial direction 16, in which the rotor blades 15 at its outer periphery relative to the Radial alignment are adjusted in the direction of rotation 14 of the rotor.
  • baffles 18 may be provided in the region between the static 2 and the dynamic classifier 5, which are preferably arranged adjustable.
  • the baffles are aligned so that the greater part of the prepare for the production of the rotor 6 .
  • the visual efficiency can be significantly increased again when the rotor 6 rotates much faster than the usual clockwise direction, whereby Turbulence can be generated.
  • the power consumption of the rotor increases accordingly.
  • the higher product fineness normally resulting from the higher speed is avoided by the employed rotor blades.
  • an operation of the rotor 6 with a peripheral speed in the range of 15 to 35 m / s, preferably in the range of 20 to 30 m / s has proven to be particularly advantageous.
  • the above-described static-dynamic classifier 100 for sifting is suitable for use in a grinding plant together with a mill, in particular a good bed roller mill 200 Fig. 3 can be seen, the coarse material from the device 100 via the outlet opening 10, optionally together with Frischgut 19, in the Gutbettwalzenmühle 200.
  • the crushed material is suitable conveying means, such as a bucket elevator, to the inlet opening 9 of the static-dynamic classifier 100 for Views of the feed material passed.
  • the fines are withdrawn via the outlet opening 11 and fed to a separator 300 for separating the classifying air from the fines.
  • the sifter efficiency of the dynamic sizing stage can be compared to conventional sifters, such as those disclosed in U.S. Pat DE 10 2005 045 591 are described to increase 10% or more.
  • conventional sifters such as those disclosed in U.S. Pat DE 10 2005 045 591 are described to increase 10% or more.
  • the throughput and the electrical energy consumption of a grinding plant with a good bed roller mill can be considerably improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)

Abstract

The invention relates to an apparatus for sifting feedstock, comprising: a. a static sifter that has a ventilated bottom which is oriented at an angle to the vertical and is penetrated by sifting gas; b. an inlet for feeding the feedstock to the ventilated bottom; c. an outlet for the coarse material; d. a dynamic sifter that is mounted downstream and encompasses at least one rotor with rotor blades and a horizontal rotor axis; e. at least one outlet for the sifting gas loaded with fine material; and f. a housing inside which the static and the dynamic sifter are arranged. The housing area surrounding the dynamic sifter is designed as a housing spiral such that the sifting gas flows against the rotor in a substantially tangential direction. The rotor rotates counter to the direction of flow of the sifting gas in the housing spiral.

Description

Die Erfindung betrifft einen statisch-dynamischen Sichter zum Sichten von Aufgabegut mit einem statischen Sichter, der einen schräg zur Vertikalen ausgerichteten, von Sichtgas durchströmten Belüftungsboden aufweist sowie einem nachgeschalteten dynamischen Sichter, der wenigstens einen Rotor mit horizontaler Rotorachse umfasst.The invention relates to a static-dynamic sifter for sifting feedstock with a static sifter having a vented bottom oriented obliquely to the vertical, through which viewing gas flows, and a downstream dynamic sifter comprising at least one rotor with a horizontal rotor axis.

Aus der DE 10 2005 045 591 A1 ist eine Mahlanlage gemäß dem Oberbegriff des Anspruchs 1 bekannt, bei der ein statischer Sichter direkt vor einem dynamischen Sichter betrieben wird und als Mühle eine Gutbettwalzenmühle und/oder Rohrmühle zum Einsatz kommt. Diese Art von statisch-dynamischen Sichtern hat sich für bestimmte Aufgabenstellungen bewährt. Das Aufgabegut gelangt über Zuführorgane (Förderbänder/Schurren) auf den Belüftungsboden des statischen Sichters und rutscht dann über den Belüftungsboden nach unten.From the DE 10 2005 045 591 A1 a grinding plant according to the preamble of claim 1 is known in which a static classifier is operated directly in front of a dynamic classifier and as a mill, a good bed roller mill and / or tube mill is used. This type of static-dynamic classifier has proven itself for certain tasks. The feed material reaches the ventilation base of the static separator via feeders (conveyor belts / chutes) and then slides downwards over the ventilation floor.

Die das Aufgabegut im Querstrom durchströmende Sichtluft trägt das Feingut zum dynamischen Sichter, während das Grobgut des statischen Sichters durch Gravitation am unteren Auslass ausgetragen wird. Durch Veränderung des Sichtluftvolumenstroms kann die Feinheit des Feinguts des statischen Sichters beeinflusst werden. Im dynamischen Sichter wird die gewünschte Produktfeinheit über den Sichtvolumenstrom und die Drehzahl des Rotors eingestellt.The view air flowing through the feed material in cross flow carries the fines to the dynamic sifter, while the coarse material of the static sifter is discharged by gravity at the lower outlet. By changing the view air volume flow, the fineness of the fine material of the static classifier can be influenced. In the dynamic classifier, the desired product fineness is set via the visual flow rate and the speed of the rotor.

Durch konstruktive Maßnahmen soll die Sichtluft den Rotor im Wesentlichen tangential anströmen, um das vom Rotor aufgebaute Zentrifugalfeld zu unterstützen. Die tangentiale Anströmung wird durch eine spiralförmige Gestaltung des den dynamischen Sichter umgebenden Gehäuses in Kombination mit einem dazu exzentrisch angeordneten dynamischen Rotor erreicht. Die sich dabei ergebenen Strömungsverhältnisse sind beispielsweise auch aus der DE 103 50 518 A1 zu ersehen. Die auf die Partikel wirkende Zentrifugalkraft und die in Richtung des Rotors wirkende Schleppkraft der Sichtluft trennen das Aufgabegut des dynamischen Sichters in Produkt und Grobgut.By constructive measures, the classifying air should flow substantially tangentially to the rotor in order to support the centrifugal field built up by the rotor. The tangential flow is achieved by a spiral configuration of the housing surrounding the dynamic classifier in combination with a dynamically arranged rotor eccentrically arranged therewith. The resulting flow conditions are, for example, from the DE 103 50 518 A1 to see. The centrifugal force acting on the particles and the direction of the Rotor's acting drag of the classifying air separates the feed material of the dynamic classifier into product and coarse material.

Aus der DD 263 468 A1 ist weiterhin ein Windsichter bekannt, in dessen Sichtraum mindestens zwei Stabkörbe in zwei zur Sichtraumachse senkrecht stehenden Ebenen übereinander angeordnet sind, die mit entgegengesetztem Drehsinn betrieben werden.From the DD 263 468 A1 Furthermore, an air classifier is known in whose viewing space at least two rod baskets are arranged one above the other in two planes perpendicular to the viewing space axis, which are operated in opposite directions of rotation.

Ferner beschreibt die DE 103 61 609 A1 einen Sichtrotor mit von außen nach innen durchströmten Strömungskanälen zwischen radialgerichteten Rotorschaufeln, wobei der Sichtrotor entgegen der tangential anströmenden Sichtluft dreht.Furthermore, the describes DE 103 61 609 A1 a classifying rotor with flow channels through which flow from outside to inside between radially directed rotor blades, wherein the classifying rotor rotates counter to the tangentially incoming classifying air.

Der Erfindung liegt nun die Aufgabe zugrunde, die Sichteffizienz eines statisch-dynamischen Sichters zu verbessern.The invention is based on the object of improving the visual efficiency of a static-dynamic classifier.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruches 1 gelöst.According to the invention, this object is solved by the features of claim 1.

Der erfindungsgemäße statisch-dynamische Sichter zum Sichten von Aufgabegut besteht im Wesentlichen aus

  1. a. einem statischen Sichter, der einen schräg zur Vertikalen ausgerichteten, von Sichtgas durchströmten Belüftungsboden aufweist,
  2. b. einer Einlassöffnung zur Aufgabe des Aufgabegutes auf den Belüftungsboden,
  3. c. einer Auslassöffnung für das Grobgut,
  4. d. einem nachgeschalteten dynamischen Sichter, der wenigstens einen Rotor mit Rotorblättern und horizontaler Rotorachse umfasst, wobei die Rotorblätter derart angestellt sind, dass sie einen Winkel (α) von 10 bis 50° zur radialen Richtung aufweisen,
  5. e. wenigstens einer Auslassöffnung für das mit Feingut beladene Sichtgas,
  6. f. sowie einem Gehäuse, in dem der statische und der dynamischen Sichter angeordnet sind, wobei der den dynamischen Sichter umgebende Bereich des Gehäuses als Gehäusespirale ausgebildet ist, so dass sich eine im Wesentlichen tangentiale Anströmung des Rotors mit Sichtgas ergibt, charakterisiert durch dem Kennzeichnenden Teil des Anspruchs 1.
The static-dynamic classifier according to the invention for sifting feed essentially consists of
  1. a. a static sifter, which has a ventilation base which is oriented obliquely to the vertical and flows through the sighting gas,
  2. b. an inlet opening for the task of the feed material on the aeration floor,
  3. c. an outlet opening for the coarse material,
  4. d. a downstream dynamic sifter comprising at least one rotor with rotor blades and horizontal rotor axis, wherein the rotor blades are set so that they have an angle (α) of 10 to 50 ° to the radial direction,
  5. e. at least one outlet opening for the fine gas laden sighting gas,
  6. f. and a housing in which the static and the dynamic classifier are arranged, wherein the area surrounding the dynamic classifier of the Housing is designed as a housing spiral, so that there is a substantially tangential flow to the rotor with classifying gas, characterized by the characterizing part of claim 1.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further embodiments of the invention are the subject of the dependent claims.

Durch die um 10 bis 50° zur radialen Richtung geneigte Anordnung der Rotorblätter lässt sich eine weitere Steigerung des Sichterwirkungsgrades um 10% und mehr der dynamischen Sichtstufe erreichen.Due to the arrangement of the rotor blades inclined by 10 to 50 ° to the radial direction, a further increase in the classifier efficiency of 10% and more of the dynamic vision level can be achieved.

Gemäß einer bevorzugten Ausgestaltung sind im Bereich zwischen dem statischen und dem dynamischen Sichter Leitbleche zur Optimierung der tangentialen Anströmung des Rotors vorgesehen, wobei wenigstens eines der Leitbleche verstellbar angeordnet sein kann.According to a preferred embodiment baffles are provided in the region between the static and the dynamic classifier for optimizing the tangential flow of the rotor, wherein at least one of the baffles can be arranged adjustable.

Beim Betreiben der Vorrichtung zum Sichten hat es sich außerdem als besonders vorteilhaft erwiesen, wenn die Umfangsgeschwindigkeit des Rotors gegenüber dem herkömmlichen Betrieb deutlich gesteigert wird, wobei eine Umfangsgeschwindigkeit im Bereich von 15 bis 35 m/s, vorzugsweise im Bereich von 20 bis 30 m/s als besonders vorteilhaft angesehen wird.In operating the sighting device, it has also been found to be particularly advantageous when the peripheral speed of the rotor is significantly increased over conventional operation, with a peripheral speed in the range of 15 to 35 m / s, preferably in the range of 20 to 30 m / s. s is considered particularly advantageous.

Der oben beschriebene statisch-dynamische Sichter zum Sichten eignet sich besonderes in einer Mahlanlage mit einer Mühle. Wird die Mühle darüber hinaus durch eine Gutbettwalzenmühle gebildet, kann der statische Sichter zumindest teilweise zum Auflösen bzw. Desagglomerieren der aus der Gutbettwalzenmühle kommenden Schülpen dienen.The above-described static-dynamic classifier for sifting is particularly suitable in a grinding plant with a mill. In addition, if the mill is formed by a good bed roller mill, the static sifter may at least partially serve to dissolve or deagglomerate the slugs coming out of the good bed roller mill.

Weitere Vorteile und Ausgestaltungen der Erfindung werden im Folgenden anhand der Beschreibung und der Zeichnung näher erläutert.Further advantages and embodiments of the invention will be explained in more detail below with reference to the description and the drawing.

In der Zeichnung zeigen

Fig. 1
eine schematische Schnittdarstellung des erfindungsgemäßen statisch-dynamischen Sichters zum Sichten von Aufgabegut,
Fig. 2
eine Detailansicht im Bereich des Rotors sowie
Fig. 3
ein Flussdiagramm einer Mahlanlage mit einem erfindungsgemäßen statisch-dynamischen Sichter zum Sichten von Aufgabegut.
In the drawing show
Fig. 1
a schematic sectional view of the static-dynamic classifier according to the invention for sifting feed,
Fig. 2
a detailed view in the area of the rotor as well
Fig. 3
a flow diagram of a grinding plant with a static-dynamic classifier according to the invention for sifting feed.

Der in Fig. 1 dargestellte statisch-dynamische Sichter 100 zum Sichten von Aufgabegut 1 besteht im Wesentlichen aus einem statischen Sichter 2, der einen schräg zur Vertikalen ausgerichteten, von Sichtgas 3 durchströmten Belüftungsboden 4 aufweist sowie einem nachgeschalteten dynamischen Sichter 5, der wenigstens einen Rotor 6 mit horizontaler Rotorachse 7 umfasst.The in Fig. 1 illustrated static-dynamic classifier 100 for sifting of feed material 1 consists essentially of a static classifier 2, which has an obliquely oriented to the vertical, by the sighting gas 3 flowed through ventilation base 4 and a downstream dynamic classifier 5, the at least one rotor 6 with horizontal rotor axis includes.

Der statische Sichter 2 und der dynamische Sichter 5 sind in einem Gehäuse 8 angeordnet, das eine Einlassöffnung 9 zur Aufgabe des Aufgabegutes 1 auf dem Belüftungsboden 4 sowie eine Auslassöffnung 10 für das Grobgut aufweist. Weiterhin ist eine Auslassöffnung 11 für das mit Feingut beladende Sichtgas vorgesehen.The static classifier 2 and the dynamic classifier 5 are arranged in a housing 8, which has an inlet opening 9 for discharging the feed material 1 on the ventilation floor 4 and an outlet opening 10 for the coarse material. Furthermore, an outlet opening 11 is provided for the laden with fines sighting gas.

Der den dynamischen Sichter 5 umgebende Bereich des Gehäuses 8 ist als Gehäusespirale ausgebildet, so dass sich eine im Wesentlichen tangentiale Anströmung des Rotors ergibt (siehe Pfeile 12, 13). Das mit Feingut beladende Sichtgas strömt somit im dargestellten Ausführungsbeispiel im Wesentlichen im Uhrzeigersinn in die Gehäusespirale ein.The area of the housing 8 surrounding the dynamic classifier 5 is designed as a housing spiral, so that a substantially tangential flow of the rotor results (see arrows 12, 13). The loading gas laden with fines thus flows in the illustrated embodiment, in a substantially clockwise direction in the housing spiral.

Die Drehrichtung 14 des Rotors 6 ist der Strömungsrichtung (Pfeile 12, 13) des Sichtgases in die Gehäusespirale entgegengesetzt, d.h. der Rotor dreht in der Darstellung gemäß Fig. 1 entgegen dem Uhrzeigersinn.The direction of rotation 14 of the rotor 6 is opposite to the flow direction (arrows 12, 13) of the classifying gas into the housing spiral, ie the rotor rotates in the illustration according to FIG Fig. 1 counterclockwise.

In der Detailansicht gemäß Fig. 2 ist zu ersehen, dass der Rotor 6 Rotorblätter aufweist, die derart angestellt sind, dass sie einen Winkel α von 10 bis 50°, vorzugsweise von 25 bis 35° zur radialen Richtung 16 aufweisen, in dem die Rotorblätter 15 an ihrem äußeren Umfang bezüglich der radialen Ausrichtung in Drehrichtung 14 des Rotors verstellt sind.In the detail view according to Fig. 2 It can be seen that the rotor 6 has rotor blades which are set to have an angle α of 10 to 50 °, preferably 25 to 35 ° to the radial direction 16, in which the rotor blades 15 at its outer periphery relative to the Radial alignment are adjusted in the direction of rotation 14 of the rotor.

Beim Sichten wird der Rotor 6 in weiten Teilen tangential angeströmt, wobei sich durch die Drehrichtung des Rotors ein entgegengesetzt drehendes Zentrifugalfeld aufbaut. Dadurch entsteht für die Sichtluft (Pfeil 13) und die darin enthaltenen Partikel 1 a die Notwendigkeit einer scharfen Umlenkung aus der Richtung im Uhrzeigersinn in die entgegengesetzte Richtung. Als Ergebnis stellt sich ein signifikant besseres Sichtergebnis ein. Das Grobgut der dynamischen Stufe enthält dadurch deutlich weniger Feinanteile, wodurch der Durchsatz erheblich verbessert werden kann. Das mit der Sichtluft mitgenommene Grobgut gelangt um den Rotor herum und wird über einen Kanal 17 zur Auslassöffnung 10 abgeleitet. Gegebenenfalls könnte stattdessen eine separate Ableitung einer Mittelkornfraktion erfolgen.When sifting the rotor 6 is flowed tangentially in large parts, with an oppositely rotating centrifugal field builds up by the direction of rotation of the rotor. This creates the need for a sharp deflection from the clockwise direction in the opposite direction for the classifying air (arrow 13) and the particles 1 a contained therein. The result is a significantly better visual outcome. The coarse material of the dynamic stage thus contains significantly less fines, whereby the throughput can be significantly improved. The coarse material entrained with the classifying air passes around the rotor and is discharged via a channel 17 to the outlet opening 10. Optionally, instead, a separate derivation of a medium grain fraction could take place.

Zur Optimierung der tangentialen Anströmung des Rotors 6 können im Bereich zwischen dem statischen 2 und dem dynamischen Sichter 5 Leitbleche 18 vorgesehen werden, die vorzugsweise verstellbar angeordnet sind. Die Leitbleche sind dabei so ausgerichtet, dass der größere Teil des Sichtluftvolumenstromes im Uhrzeigersinn in die Gehäusespirale einströmt. Lediglich ein kleinerer Teil wird gegen den Uhrzeigersinn eingezogen.To optimize the tangential flow of the rotor 6 baffles 18 may be provided in the region between the static 2 and the dynamic classifier 5, which are preferably arranged adjustable. The baffles are aligned so that the greater part of the Sichtluftvolumenstromes flows clockwise into the housing spiral. Only a smaller part is retracted counterclockwise.

Die Sichteffizienz kann nochmals wesentlich gesteigert werden, wenn der Rotor 6 erheblich schneller dreht als bei üblicher Drehrichtung im Uhrzeigersinn, wodurch Turbulenzen erzeugt werden. Die Leistungsaufnahme des Rotors steigt dadurch entsprechend an. Die sich durch die höhere Drehzahl normalerweise einstellende höhere Produktfeinheit wird durch die angestellten Rotorblätter vermieden. Bei den der Erfindung zugrundeliegenden Versuchen hat sich ein Betrieb des Rotors 6 mit einer Umfangsgeschwindigkeit im Bereich von 15 bis 35 m/s, vorzugsweise im Bereich von 20 bis 30 m/s als besonders vorteilhaft erwiesen.The visual efficiency can be significantly increased again when the rotor 6 rotates much faster than the usual clockwise direction, whereby Turbulence can be generated. The power consumption of the rotor increases accordingly. The higher product fineness normally resulting from the higher speed is avoided by the employed rotor blades. In the experiments underlying the invention, an operation of the rotor 6 with a peripheral speed in the range of 15 to 35 m / s, preferably in the range of 20 to 30 m / s has proven to be particularly advantageous.

Der oben beschriebene statisch-dynamische Sichter 100 zum Sichten eignet sich zum Einsatz in einer Mahlanlage zusammen mit einer Mühle, insbesondere einer Gutbettwalzenmühle 200. Wie aus Fig. 3 zu ersehen ist, gelangt das grobe Gut aus der Vorrichtung 100 über die Auslassöffnung 10, gegebenenfalls zusammen mit Frischgut 19, in die Gutbettwalzenmühle 200. Das zerkleinerte Material wird über geeignete Fördermittel, beispielsweise ein Becherwerk, zur Einlassöffnung 9 der statisch-dynamische Sichter 100 zum Sichten des Aufgabegutes geleitet. Das Feingut wird über die Auslassöffnung 11 abgezogen und einem Abscheider 300 zur Trennung der Sichtluft vom Feingut zugeführt.The above-described static-dynamic classifier 100 for sifting is suitable for use in a grinding plant together with a mill, in particular a good bed roller mill 200 Fig. 3 can be seen, the coarse material from the device 100 via the outlet opening 10, optionally together with Frischgut 19, in the Gutbettwalzenmühle 200. The crushed material is suitable conveying means, such as a bucket elevator, to the inlet opening 9 of the static-dynamic classifier 100 for Views of the feed material passed. The fines are withdrawn via the outlet opening 11 and fed to a separator 300 for separating the classifying air from the fines.

Mit dem oben beschriebenen statisch-dynamischen Sichter 100 zum Sichten von Aufgabegut lässt sich der Sichterwirkungsgrad der dynamischen Sichtstufe gegenüber herkömmlichen Sichtern, wie sie beispielsweise in der DE 10 2005 045 591 beschrieben sind, um 10% oder mehr steigern. Dadurch kann auch der Durchsatz und der elektrische Energiebedarf einer Mahlanlage mit Gutbettwalzenmühle erheblich verbessert werden.With the above-described static-dynamic sifter 100 for sifting feed, the sifter efficiency of the dynamic sizing stage can be compared to conventional sifters, such as those disclosed in U.S. Pat DE 10 2005 045 591 are described to increase 10% or more. As a result, the throughput and the electrical energy consumption of a grinding plant with a good bed roller mill can be considerably improved.

Claims (7)

  1. Static-dynamic sifter (100) for sifting feedstock (1), comprising
    a. a static sifter (2) having an aeration base (4) which is oriented at an angle to the vertical and through which sifting gas (3) flows,
    b. an inlet opening (9) for feeding the feedstock (1) onto the aeration base (4),
    c. an outlet opening (10) for the coarse material,
    d. a dynamic sifter (5) which is arranged downstream and which comprises at least one rotor (6) having rotor blades (15) and a horizontal rotor axis,
    e. at least one outlet opening (11) for the sifting gas charged with fine material,
    f. and also a housing (8) in which the static and the dynamic sifter are arranged, the region of the housing surrounding the dynamic sifter (5) being in the form of a housing volute so that a tangential flow of sifting gas against the rotor (6) results,
    characterised in that the rotor blades (15) are so set that they are at an angle (α) of from 10 to 50° to the radial direction (16) in that the rotor blades (15) are offset at their outer circumference relative to the radial orientation in the direction of rotation (14) of the rotor (6) and the direction of rotation (14) of the rotor (6) is counter to the direction of flow of the sifting gas (3) in the housing volute.
  2. Static-dynamic sifter according to claim 1, characterised in that guide plates (18) for optimising the tangential flow against the rotor are provided in the region between the static and the dynamic sifter (2, 5).
  3. Static-dynamic sifter according to claim 1, characterised in that at least one guide plate (18) is arranged in such a manner as to be adjustable.
  4. Method for sifting feedstock (1) with a static-dynamic sifter for sifting (100) according to one or more of claims 1 to 3,
    characterised in that the rotor (6) is operated with a direction of rotation (14) which is counter to the direction of flow of the sifting gas (3) in the housing volute.
  5. Method according to claim 4, characterised in that the rotor is operated at a circumferential speed in the range of from 15 to 35 m/s.
  6. Grinding installation having a mill and a static-dynamic sifter for sifting (100) according to one or more of claims 1 to 3.
  7. Grinding installation according to claim 6, characterised in that the mill is formed by a material bed roller mill (200).
EP08750058A 2007-05-08 2008-05-05 Apparatus and method for sifting feedstock including grinding mill Not-in-force EP2142312B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007021545A DE102007021545B4 (en) 2007-05-08 2007-05-08 Apparatus and method for sifting feed and grinding equipment
PCT/EP2008/055501 WO2008135558A2 (en) 2007-05-08 2008-05-05 Apparatus and method for sifting feedstock

Publications (2)

Publication Number Publication Date
EP2142312A2 EP2142312A2 (en) 2010-01-13
EP2142312B1 true EP2142312B1 (en) 2012-04-18

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EP08750058A Not-in-force EP2142312B1 (en) 2007-05-08 2008-05-05 Apparatus and method for sifting feedstock including grinding mill

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US (1) US8430246B2 (en)
EP (1) EP2142312B1 (en)
CN (1) CN101652191B (en)
AT (1) ATE553855T1 (en)
BR (1) BRPI0809019A8 (en)
CA (1) CA2680393C (en)
DE (1) DE102007021545B4 (en)
DK (1) DK2142312T3 (en)
ES (1) ES2383048T3 (en)
MX (1) MX2009010266A (en)
WO (1) WO2008135558A2 (en)

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DE102011055762B4 (en) * 2011-11-28 2014-08-28 Maschinenfabrik Köppern GmbH & Co KG Device for sifting granular material and grinding plant
CN103008242B (en) * 2013-01-08 2015-08-26 潍坊市精华粉体工程设备有限公司 Single casing multi-stage classifier
CN105562340B (en) * 2016-02-26 2017-07-28 重庆合盛工业有限公司 A kind of rough separator of chaff
CN110975994B (en) * 2019-12-31 2021-07-20 南通利元亨机械有限公司 Raymond mill air inlet volute
DE102021001238B4 (en) * 2021-03-09 2023-01-26 Hosokawa Alpine Aktiengesellschaft Centrifugal air classifier and method for classifying dusty goods
CN114345454A (en) * 2021-12-01 2022-04-15 中材（天津）粉体技术装备有限公司 High-efficiency low-resistance vertical roller mill
CN115971040B (en) * 2022-12-16 2023-08-04 河北地质大学 Automatic sample screening device

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US20100116720A1 (en) 2010-05-13
DE102007021545B4 (en) 2011-07-28
BRPI0809019A8 (en) 2015-04-28
BRPI0809019A2 (en) 2014-09-23
EP2142312A2 (en) 2010-01-13
DK2142312T3 (en) 2012-07-23
ATE553855T1 (en) 2012-05-15
ES2383048T3 (en) 2012-06-15
DE102007021545A1 (en) 2008-11-27
CA2680393A1 (en) 2008-11-13
WO2008135558A3 (en) 2008-12-31
CA2680393C (en) 2014-08-12
WO2008135558A2 (en) 2008-11-13
CN101652191A (en) 2010-02-17
US8430246B2 (en) 2013-04-30
CN101652191B (en) 2012-09-26
MX2009010266A (en) 2009-10-12

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