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EP2906349B1 - Grinding mill - Google Patents

Grinding mill Download PDF

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Publication number
EP2906349B1
EP2906349B1 EP13777001.2A EP13777001A EP2906349B1 EP 2906349 B1 EP2906349 B1 EP 2906349B1 EP 13777001 A EP13777001 A EP 13777001A EP 2906349 B1 EP2906349 B1 EP 2906349B1
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EP
European Patent Office
Prior art keywords
classifier
classifying
grinding
roller press
installation 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.)
Active
Application number
EP13777001.2A
Other languages
German (de)
French (fr)
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EP2906349A1 (en
Inventor
Olaf Hagemeier
Aimo Dirk HAACK
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
ThyssenKrupp Industrial Solutions AG
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Publication of EP2906349A1 publication Critical patent/EP2906349A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
    • B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • 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
    • B07B7/01—Selective separation of solid materials carried by, or dispersed in, gas currents using gravity
    • 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

Definitions

  • the invention relates to a grinding plant according to the preamble of claim 1 for the comminution of brittle material.
  • a Umlaufmahlstrom is known with a static sifter arranged above the roller press, wherein the coarse material of the classifier passes by gravity into the feed chute of the roller press.
  • the fresh material, together with the rams of the roller press discharge, will be delivered to the static sifter via a conveyor.
  • the width of the classifier is substantially adapted to the width of the grinding rollers so that the comminuted material to be ground with optimum width distribution passes into the static classifier.
  • both variants require a high design effort and lead to a very high height.
  • the arrangement of the roller press above the static classifier is associated with enormous costs due to the high weight.
  • a grinding plant which includes a roller press for crushing brittle material with two counter-rotating grinding rollers, also a static separator with a prepare for crushing brittle material with two counter-rotating grinding rollers, also a static separator with a prepare for crushing brittle material with two counter-rotating grinding rollers, with a Grobgutauslass and a fine material outlet, wherein the Grobgutauslass communicates with the roll press ,
  • This grinding plant also contains a conveyor, which promotes the discharge of the roller press to prepare for the static classifier.
  • the DE 694 21 994 T2 shows finally a grinding plant with a roller mill and a classifier of the fluid bed type.
  • the box-shaped housing of this classifier is divided by a porous inclined partition plate into an upper fluid bed chamber and a lower air inlet chamber.
  • the regrind to be classified is introduced from above into the fluid bed chamber on one side, while on the other side the fluidized fines are discharged upwards and the non-floating coarse material is drawn off downwards.
  • the invention has for its object to simplify a grinding system referred to in the preamble of claim 1 species in a constructive respect and at the same time to allow a high visual efficiency.
  • the conveyor and the classifier are structurally arranged side by side, the overall height and thus the design complexity can be significantly reduced. Also, the fact that the plant parts are arranged in the material flow direction in a straight line one behind the other, the construction can be simplified, since no lateral material deflections between roller press and sifter are required. The material to be inspected is thus transported in one direction and thereby raised only by the conveyor.
  • the conveyor side facing the sifter while the reformgaseinlass is connected in a remote from the conveyor area to the sifter, which arranged in a line one behind the other system parts, in particular the conveyor and the classifier, very compact ,
  • the static sifter has two viewing chambers arranged one above the other and separated from one another by the aeration bottom, wherein the fresh material inlet and / or ground material comminuted in the roller press opens into the upper sifting space and the sifting gas inlet is connected to the lower sifting space.
  • the first coarse material outlet is also connected to the upper viewing space, and the lower viewing space is provided with a second coarse material outlet.
  • the in the FIGS. 1 and 2 Milling plant shown essentially comprises a roller press 1, a conveyor 2 and a separator 3.
  • the roller press is equipped for crushing brittle ground material, such as limestone, with two counter-rotating grinding rollers, which form a Mahlspalt between them and are pressed against each other with high pressure.
  • the roller press is particularly suitable for comminution, as in the EP 0 084 383 is described in more detail.
  • the static sifter 3 has a prepare for fresh and / or comminuted in the roller press 1 regrind 5, an angle to the horizontal arranged, traversed by classifying gas 6 aeration bottom 7, a Grobgutauslass 8 and a fines outlet 9.
  • the conveyor 2 is preferably designed as a bucket elevator, wherein the upper end 2a is in communication with the prepareguteinlass 4 of the classifier 3 via a chute 10.
  • a conveyor 11 for example a tape drive or a belt conveyor, which communicates with a Frischgutiergabe 12 and the roller press 1 to transport fresh material to be ground 13 and / or ground in the roller press ground material 14 to the lower end 2b of the conveyor 2 ,
  • the roller press 1, the conveyor 2 and the classifier 3 are structurally arranged side by side and in the material flow direction 15 in a straight line one behind the other.
  • the width of the conveyor 2 substantially corresponds to the width of the preparefory conveyor 3.
  • the width of conveyor and classifier for example, at least 2.5 m, 3 m , 3.5 m, or 4 m.
  • the conveyor can of course also be formed by two or more transversely to the conveying direction 15 directly juxtaposed, correspondingly narrower conveyors.
  • the classifier 3 will be described below with reference to FIG Fig. 3 described in more detail. It essentially consists of an upper viewing area 16, a lower viewing area 17 and the ventilation floor 7 arranged obliquely to the horizontal, which separates the two viewing areas from one another.
  • the ventilation floor 7 is as an inclined plane with Ventilation openings or formed as an inclined hole bottom.
  • the openings of the ventilation floor can have different opening geometries distributed over the entire area.
  • the crusherguteinlass 4 opens into the upper viewing space 16 in the region of the upper end of the ventilation floor 7, while at the lower reformraum 17 a reformgaseinlass 18 is provided for supplying the reformgas 6.
  • the classifying gas 5 flows from the classifying gas inlet 18 upwards and through the aeration bottom 7.
  • the classifying material 5 is thus flowed through in the upper classifying chamber 16 essentially transversely through the classifying gas, whereby the coarse material is discharged via the first crude material output 8 arranged at the lower end of the aeration bottom 7.
  • the fine material is fed together with the classifying gas via the fine material outlet 9 to a subsequently arranged dynamic classifier 19.
  • the coarse material of the countercurrent sight zone falls down on an inclined bottom 20 of the lower reformraums 17, at the lower end of a second Grobgutauslass 21 is provided for the coarse material of the counterflow view zone.
  • the angle of inclination of the inclined bottom 20 is expediently greater than the wall friction angle of the coarse material to be rejected, in order to ensure that the coarse material automatically slips out of the classifier.
  • the fines of the countercurrent view zone is either pressed with the classifying gas 6 through the vent bottom 7 or can partially via one at the top of the lower view space 17 provided second fine exhaust outlet 22 withdrawn and fed via a line 23 to the dynamic classifier 19.
  • Via a arranged in the line 23 flap 24 of the branched off from the lower viewing space 17 partial flow is adjusted to thereby also affect the visibility in the transverse vision zone in the upper viewing space 16 targeted.
  • a withdrawn via line 23 amount of visible gas reduces the amount of visible gas flowing through the vent bottom 7 accordingly. In this way, the visual gas velocity distribution of the static classifier 3 for the dynamic classifier 19 can be optimized without the attendant aeration bottom failure, ie the material falling through the aeration bottom, can adversely affect the entire process.
  • the sortguteinlass 4 is arranged on the conveyor 2 side facing the sifter, while the reformgaseinlass 18 is connected to the classifying gas 6 in a region facing away from the conveyor, here on the opposite side of the separator 3.
  • the classifying gas is supplied via two or more reformgaseinlässe.
  • the angle between the orientation of the reformguteinlasses 4 and the reformgaseinlasses 18 should be at least 15 ° and at most 345 °, so that the conveyor 2 can be arranged as close to the classifier 3.
  • the sortgaseinlass 18 with the connected sighting gas line 25 should therefore not come into conflict with the conveyor 2.
  • the two coarse material outlets 8 and 21 allow an unrestricted return of the coarse material in the grinding and visual process.
  • the ventilation floor throughput is through the second Grobgutauslass 21 in the lower
  • the coarse material discharged via the coarse material outlets 8 and 21 of the static classifier 3 is conveyed upwards via a second conveyor 26, wherein the upper end is connected to the feed chute 1 a of the roller press 1 via a further conveyor 27.
  • the second conveyor 26 is expediently again designed as a bucket elevator, with a belt or belt conveyor being considered for the further conveyor 27.
  • a metal discharge device 28 is furthermore provided, via which any metal parts falling from the separator can be removed in front of the roll press 1, in order to avoid damage or destruction of the roll surfaces.
  • the fines 29 of the dynamic classifier 19 is supplied to a separator 30 together with the classifying gas.
  • roller press, conveyor and separator the height can be significantly reduced.
  • all high loads are located close to the ground, which also allows easier accessibility to the individual machines during maintenance.
  • the throughput can be increased by the use of wider classifiers.
  • the lower heights of the conveyors also increase mechanical safety and thus enable higher sales.

Landscapes

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

Description

Die Erfindung betrifft eine Mahlanlage entsprechend dem Oberbegriff des Anspruches 1 zur Zerkleinerung von sprödem Mahlgut.The invention relates to a grinding plant according to the preamble of claim 1 for the comminution of brittle material.

Aus der EP 0 650 763 A1 ist eine Umlaufmahlanlage mit einem oberhalb der Walzenpresse angeordneten statischen Sichter bekannt, wobei das Grobgut des Sichters mittels Schwerkraft in den Aufgabeschacht der Walzenpresse gelangt. Das Frischgut wird zusammen mit den Schülpen des Walzenpressenaustrags über ein Förderwerk dem statischen Sichter aufgeben. Weiterhin zeigt die DE 10 221 739 A1 eine Anordnung, bei der die Walzenpresse oberhalb des statischen Sichters angeordnet ist. Hierbei ist die Breite des Sichters im Wesentlichen an die Breite der Mahlwalzen angepasst, sodass das zerkleinerte Mahlgut mit optimaler Breitenverteilung in den statischen Sichter gelangt. Beide Varianten erfordern jedoch einen hohen konstruktiven Aufwand und führen zu einer sehr hohen Bauhöhe. Insbesondere ist die Anordnung der Walzenpresse oberhalb des statischen Sichters aufgrund des hohen Gewichts mit enormen Kosten verbunden.From the EP 0 650 763 A1 a Umlaufmahlanlage is known with a static sifter arranged above the roller press, wherein the coarse material of the classifier passes by gravity into the feed chute of the roller press. The fresh material, together with the rams of the roller press discharge, will be delivered to the static sifter via a conveyor. Furthermore, the shows DE 10 221 739 A1 an arrangement in which the roller press is arranged above the static classifier. In this case, the width of the classifier is substantially adapted to the width of the grinding rollers so that the comminuted material to be ground with optimum width distribution passes into the static classifier. However, both variants require a high design effort and lead to a very high height. In particular, the arrangement of the roller press above the static classifier is associated with enormous costs due to the high weight.

Es hat sich ferner inzwischen herausgestellt, dass die Effizienz des statischen Sichters gesteigert werden kann, wenn er mehr in die Breite und entsprechend weniger hoch gebaut wird. Gemäß der EP 1 786 573 B1 hat sich dabei ein Verhältnis von Breite zu vertikaler Höhe des Belüftungsbodens von wenigstens 0,45 als besonders vorteilhaft herausgebildet. Walzenpressen haben jedoch üblicherweise nur eine Breite von 1,5 bis maximal 2 m und eine signifikante Steigerung der Breite ist derzeitig nicht denkbar. Derzeit werden daher sehr hohe und schmale statische Sichter verwendet. Wollte man einen breiteren und entsprechend niedrigeren Sichter unter einer Walzenpresse positionieren, so müsste man Mittel vorsehen, um das Walzenpressenaustragsgut auf die Breite des Sichters zu verteilen. Solche Maßnahmen bedingen jedoch eine zusätzliche Bauhöhe.It has now also been found that the efficiency of the static classifier can be increased if it is built more in width and correspondingly less high. According to the EP 1 786 573 B1 In this case, a ratio of width to vertical height of the ventilation floor of at least 0.45 has emerged as particularly advantageous. Roller presses, however, usually only have a width of 1.5 to a maximum of 2 m and a significant increase in the width is currently unthinkable. Currently very high and narrow static classifiers are used. If one wanted to position a wider and correspondingly lower classifier under a roll press, then one would have to provide means for distributing the Walzenpressenaustragsgut to the width of the classifier. However, such measures require an additional height.

Aus der US 1 002 504 A ist weiterhin eine Mahlanlage bekannt, die eine Walzenpresse zur Zerkleinerung von sprödem Mahlgut mit zwei gegenläufigen Mahlwalzen enthält, ferner einen statischen Sichter mit einem Sichtguteinlass für in der Walzenpresse zerkleinertes Mahlgut, mit einem Grobgutauslass und einem Feingutauslass, wobei der Grobgutauslass mit der Walzenpresse in Verbindung steht. Diese Mahlanlage enthält ferner ein Förderwerk, das den Austrag der Walzenpresse zum Sichtguteinlass des statischen Sichters hochfördert.From the US 1 002 504 A Furthermore, a grinding plant is known, which includes a roller press for crushing brittle material with two counter-rotating grinding rollers, also a static separator with a Sichtguteinlass for comminuted in the roll press mill, with a Grobgutauslass and a fine material outlet, wherein the Grobgutauslass communicates with the roll press , This grinding plant also contains a conveyor, which promotes the discharge of the roller press to Sichtguteinlass the static classifier.

Die DE 694 21 994 T2 zeigt schließlich eine Mahlanlage mit einer Walzenmühle und einer Klassifiziereinrichtung des Fluidbett-Typs. Das kastenförmige Gehäuse dieser Klassifiziereinrichtung ist durch eine poröse, geneigte Trennplatte in eine obere Fluidbettkammer und eine untere Lufteintrittskammer unterteilt. Das zu klassifizierende Mahlgut wird auf der einen Seite von oben in die Fluidbettkammer eingeleitet, während auf der anderen Seite das fluidisierte Feingut nach oben ausgetragen und das nicht schwebende Grobgut nach unten abgezogen wird.The DE 694 21 994 T2 shows finally a grinding plant with a roller mill and a classifier of the fluid bed type. The box-shaped housing of this classifier is divided by a porous inclined partition plate into an upper fluid bed chamber and a lower air inlet chamber. The regrind to be classified is introduced from above into the fluid bed chamber on one side, while on the other side the fluidized fines are discharged upwards and the non-floating coarse material is drawn off downwards.

Der Erfindung liegt die Aufgabe zugrunde, eine Mahlanlage der im Oberbegriff des Anspruches 1 genannten Art in konstruktiver Hinsicht zu vereinfachen und zugleich eine hohe Sichteffizienz zu ermöglichen.The invention has for its object to simplify a grinding system referred to in the preamble of claim 1 species in a constructive respect and at the same time to allow a high visual efficiency.

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.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Indem die Walzenpresse, das Förderwerk und der Sichter baulich nebeneinander angeordnet sind, kann die Bauhöhe und dadurch der konstruktive Aufwand erheblich reduziert werden. Auch dadurch, dass die Anlagenteile in Materialflussrichtung in gerader Linie hintereinander angeordnet werden, kann die Konstruktion vereinfacht werden, da keine seitlichen Materialumlenkungen zwischen Walzenpresse und Sichter erforderlich sind. Das zu sichtende Material wird somit in einer Richtung transportiert und dabei lediglich durch das Förderwerk angehoben.By the roll press, the conveyor and the classifier are structurally arranged side by side, the overall height and thus the design complexity can be significantly reduced. Also, the fact that the plant parts are arranged in the material flow direction in a straight line one behind the other, the construction can be simplified, since no lateral material deflections between roller press and sifter are required. The material to be inspected is thus transported in one direction and thereby raised only by the conveyor.

Für eine effiziente Sichtung im statischen Sichter ist eine möglichst gleichmäßige Materialaufgabe auf den Sichter wichtig. Es ist daher besonders wichtig, dass die auf dem Förderwerk vorhandene Breitenverteilung des zu sichtenden Gutes nicht durch etwaige, von der eigentlichen Transportrichtung abweichende Umlenkungen gestört wird.For an efficient sighting in the static classifier, it is important to distribute the material as evenly as possible to the classifier. It is therefore particularly important that the existing on the conveyor width distribution of the goods to be inspected is not disturbed by any deviating from the actual transport direction deflections.

Im Rahmen der Erfindung können jedoch auch mehrere Walzenpressen und/oder mehrere Förderwerke und/oder mehrere statische Sichter zum Einsatz kommen.Within the scope of the invention, however, it is also possible to use a plurality of roller presses and / or a plurality of conveyors and / or a plurality of static classifiers.

Da erfindungsgemäß der Sichtguteinlass auf der dem Förderwerk zugewandten Seite des Sichters angeordnet ist, während der Sichtgaseinlass in einem vom Förderwerk abgewandten Bereich an den Sichter angeschlossen ist, lassen sich die in einer Linie hintereinander angeordneten Anlagenteile, insbesondere das Förderwerk und der Sichter, sehr kompakt anordnen.Since according to the invention the Sichtguteinlass is arranged on the conveyor side facing the sifter, while the Sichtgaseinlass is connected in a remote from the conveyor area to the sifter, which arranged in a line one behind the other system parts, in particular the conveyor and the classifier, very compact ,

Erfindungsgemäß weist der statische Sichter zwei übereinander angeordnete und durch den Belüftungsboden voneinander getrennte Sichträume auf, wobei der Sichtguteinlass für das frische und/oder in der Walzenpresse zerkleinerte Mahlgut in den oberen Sichtraum mündet und der Sichtgaseinlass an den unteren Sichtraum angeschlossen ist. Erfindungsgemäß ist ferner der erste Grobgutauslass an den oberen Sichtraum angeschlossen und der untere Sichtraum mit einem zweiten Grobgutauslass versehen.According to the invention, the static sifter has two viewing chambers arranged one above the other and separated from one another by the aeration bottom, wherein the fresh material inlet and / or ground material comminuted in the roller press opens into the upper sifting space and the sifting gas inlet is connected to the lower sifting space. According to the invention, the first coarse material outlet is also connected to the upper viewing space, and the lower viewing space is provided with a second coarse material outlet.

Weitere Ausgestaltungen der Erfindung, die Gegenstand der Unteransprüche sind, werden im Folgenden anhand der Beschreibung eines Ausführungsbeispiels und der Zeichnung näher erläutert.Further embodiments of the invention, which are the subject of the dependent claims, are explained in more detail below with reference to the description of an embodiment and the drawing.

In der Zeichnung zeigen

Fig. 1
eine schematische Vorderansicht der erfindungsgemäßen Mahlanlage,
Fig. 2
eine schematische Draufsicht der Mahlanlage gemäß Fig. 1 und
Fig. 3
eine schematische Seitenansicht des Sichters.
In the drawing show
Fig. 1
a schematic front view of the grinding plant according to the invention,
Fig. 2
a schematic plan view of the grinding plant according to Fig. 1 and
Fig. 3
a schematic side view of the separator.

Die in den Figuren 1 und 2 dargestellte Mahlanlage weist im Wesentlichen eine Walzenpresse 1, ein Förderwerk 2 und einen Sichter 3 auf. Die Walzenpresse ist zur Zerkleinerung von sprödem Mahlgut, wie beispielsweise Kalkstein, mit zwei gegenläufig rotierenden Mahlwalzen ausgestattet, die zwischen sich einen Mahlspalt bilden und mit hohem Druck gegeneinander gepresst werden. Die Walzenpresse ist insbesondere zur Gutbettzerkleinerung geeignet, wie sie in der EP 0 084 383 näher beschrieben ist. Der statische Sichter 3 weist einen Sichtguteinlass 4 für frisches und/oder in der Walzenpresse 1 zerkleinertes Mahlgut 5, einen schräg zur Horizontalen angeordneten, von Sichtgas 6 durchströmten Belüftungsboden 7, einen Grobgutauslass 8 und einen Feingutauslass 9 auf. Das Förderwerk 2 ist vorzugsweise als Becherwerk ausgebildet, wobei dessen oberes Ende 2a mit dem Sichtguteinlass 4 des Sichters 3 über eine Schurre 10 in Verbindung steht.The in the FIGS. 1 and 2 Milling plant shown essentially comprises a roller press 1, a conveyor 2 and a separator 3. The roller press is equipped for crushing brittle ground material, such as limestone, with two counter-rotating grinding rollers, which form a Mahlspalt between them and are pressed against each other with high pressure. The roller press is particularly suitable for comminution, as in the EP 0 084 383 is described in more detail. The static sifter 3 has a Sichtguteinlass 4 for fresh and / or comminuted in the roller press 1 regrind 5, an angle to the horizontal arranged, traversed by classifying gas 6 aeration bottom 7, a Grobgutauslass 8 and a fines outlet 9. The conveyor 2 is preferably designed as a bucket elevator, wherein the upper end 2a is in communication with the Sichtguteinlass 4 of the classifier 3 via a chute 10.

Weiterhin ist eine Fördereinrichtung 11, beispielsweise ein Bandlaufwerk oder ein Gurtförderer, vorgesehen, die mit einer Frischgutaufgabe 12 und der Walzenpresse 1 in Verbindung steht, um frisches Mahlgut 13 und/oder in der Walzenpresse zerkleinertes Mahlgut 14 zum unteren Ende 2b des Förderwerks 2 zu transportieren.Furthermore, a conveyor 11, for example a tape drive or a belt conveyor, is provided, which communicates with a Frischgutaufgabe 12 and the roller press 1 to transport fresh material to be ground 13 and / or ground in the roller press ground material 14 to the lower end 2b of the conveyor 2 ,

Wie sich aus Figuren 1 und 2 ergibt, sind die Walzenpresse 1, das Förderwerk 2 und der Sichter 3 baulich nebeneinander und in Materialflussrichtung 15 in gerader Linie hintereinander angeordnet. Um eine optimale Breitenverteilung des Sichtgutes bei der Aufgabe in den Sichter 3 zu erreichen, entspricht die Breite des Förderwerks 2 im Wesentlichen der Breite des Sichtguteinlasses 4 des Sichters 3. Dabei kann die Breite von Förderwerk und Sichter beispielsweise wenigstens 2,5 m, 3 m, 3,5 m, oder 4 m betragen. Das Förderwerk kann selbstverständlich auch durch zwei oder mehrere quer zur Förderrichtung 15 unmittelbar nebeneinander angeordnete, entsprechend schmalere Förderwerke gebildet werden.As it turned out FIGS. 1 and 2 results, the roller press 1, the conveyor 2 and the classifier 3 are structurally arranged side by side and in the material flow direction 15 in a straight line one behind the other. In order to achieve an optimal width distribution of the goods to be seen in the task in the classifier 3, the width of the conveyor 2 substantially corresponds to the width of the Sichtguteinlasses 4 of the classifier 3. The width of conveyor and classifier, for example, at least 2.5 m, 3 m , 3.5 m, or 4 m. The conveyor can of course also be formed by two or more transversely to the conveying direction 15 directly juxtaposed, correspondingly narrower conveyors.

Der Sichter 3 wird im Folgenden anhand der Fig. 3 näher beschrieben. Er besteht im Wesentlichen aus einem oberen Sichtraum 16, einem unteren Sichtraum 17 und dem schräg zur Horizontalen angeordneten Belüftungsboden 7, der die beiden Sichträume voneinander trennt. Der Belüftungsboden 7 ist als geneigte Ebene mit Belüftungsöffnungen oder als geneigter Lochboden ausgebildet. Die Öffnungen des Belüftungsbodens können über die gesamte Fläche verteilt unterschiedliche Öffnungsgeometrien aufweisen. Das hat den Vorteil, dass sowohl durch die Anordnung als auch die jeweilige Öffnungsgeometrie die Sichtgasverteilung, die Sichtgasgeschwindigkeit und die Sichtgasrichtung beeinflussbar sind, um eine optimale Durchströmung des Sichtgutes an jedem Punkt des Belüftungsbodens zu gewährleisten. Damit kann die Sichteffizienz weiter gesteigert werden.The classifier 3 will be described below with reference to FIG Fig. 3 described in more detail. It essentially consists of an upper viewing area 16, a lower viewing area 17 and the ventilation floor 7 arranged obliquely to the horizontal, which separates the two viewing areas from one another. The ventilation floor 7 is as an inclined plane with Ventilation openings or formed as an inclined hole bottom. The openings of the ventilation floor can have different opening geometries distributed over the entire area. This has the advantage that both the arrangement and the respective opening geometry the Sichtgasverteilung, the Sichtgasgeschwindigkeit and the Sichtgasrichtung can be influenced to ensure optimum flow through the visual material at each point of the ventilation floor. Thus, the visual efficiency can be further increased.

Der Sichtguteinlass 4 mündet in den oberen Sichtraum 16 im Bereich des oberen Endes des Belüftungsbodens 7, während am unteren Sichtraum 17 ein Sichtgaseinlass 18 zum Zuführen des Sichtgases 6 vorgesehen ist. Das Sichtgas strömt vom Sichtgaseinlass 18 nach oben und durch den Belüftungsboden 7. Das Sichtgut 5 wird somit im oberen Sichtraum 16 im Wesentlichen quer vom Sichtgas durchströmt, wobei das Grobgut über den am unteren Ende des Belüftungsbodens 7 angeordneten ersten Grobgutauslass 8 ausgeschleust wird. Das Feingut wird zusammen mit dem Sichtgas über den Feingutauslass 9 einem nachfolgend angeordneten dynamischen Sichter 19 zugeführt. Es bildet sich somit im oberen Sichtraum eine Querstromsichtzone aus, während im unteren Sichtraum eine Gegenstromsichtzone für das durch den Belüftungsboden hindurchfallende Sichtgut vorgesehen ist. Die Ausgestaltung des dynamischen Sichters 19 und das Zusammenspiel mit dem statischen Sichter ist beispielsweise aus der EP 1 786 573 B1 bekannt.The Sichtguteinlass 4 opens into the upper viewing space 16 in the region of the upper end of the ventilation floor 7, while at the lower Sichtraum 17 a Sichtgaseinlass 18 is provided for supplying the Sichtgas 6. The classifying gas 5 flows from the classifying gas inlet 18 upwards and through the aeration bottom 7. The classifying material 5 is thus flowed through in the upper classifying chamber 16 essentially transversely through the classifying gas, whereby the coarse material is discharged via the first crude material output 8 arranged at the lower end of the aeration bottom 7. The fine material is fed together with the classifying gas via the fine material outlet 9 to a subsequently arranged dynamic classifier 19. It thus forms in the upper Sichtraum a Querstromsichtzone, while in the lower Sichtraum a Gegenstromsichtzone is provided for the falling through the aeration bottom Sichtgut. The design of the dynamic classifier 19 and the interaction with the static classifier is, for example, from EP 1 786 573 B1 known.

Das Grobgut der Gegenstromsichtzone fällt nach unten auf einen geneigten Boden 20 des unteren Sichtraums 17, an dessen unterem Ende ein zweiter Grobgutauslass 21 für das Grobgut der Gegenstromsichtzone vorgesehen ist. Der Neigungswinkel des geneigten Bodens 20 ist zweckmäßigerweise größer als der Wandreibungswinkel des auszuschleusenden Grobgutes, damit sichergestellt ist, dass das Grobgut selbsttätig aus dem Sichter rutscht.The coarse material of the countercurrent sight zone falls down on an inclined bottom 20 of the lower Sichtraums 17, at the lower end of a second Grobgutauslass 21 is provided for the coarse material of the counterflow view zone. The angle of inclination of the inclined bottom 20 is expediently greater than the wall friction angle of the coarse material to be rejected, in order to ensure that the coarse material automatically slips out of the classifier.

Das Feingut der Gegenstromsichtzone wird entweder mit dem Sichtgas 6 durch den Belüftungsboden 7 gedrückt oder kann teilweise über einen am oberen Ende des unteren Sichtraums 17 vorgesehenen zweiten Feingutauslass 22 abgezogen und über eine Leitung 23 dem dynamischen Sichter 19 zugeführt werden. Über eine in der Leitung 23 angeordnete Klappe 24 wird der aus dem unteren Sichtraum 17 abzuzweigende Teilstrom eingestellt, um dadurch auch die Sichtverhältnisse in der Quersichtzone im oberen Sichtraum 16 gezielt beeinflussen zu können. Eine über die Leitung 23 abgezogene Sichtgasmenge reduziert die durch den Belüftungsboden 7 strömende Sichtgasmenge entsprechend. Auf diese Weise kann die Sichtgasgeschwindigkeitsverteilung des statischen Sichters 3 für den dynamischen Sichter 19 optimiert werden, ohne dass der damit einhergehende Belüftungsbodendurchfall, d. h. das Gut, welches durch den Belüftungsboden fällt, den gesamten Prozess negativ beeinflussen kann.The fines of the countercurrent view zone is either pressed with the classifying gas 6 through the vent bottom 7 or can partially via one at the top of the lower view space 17 provided second fine exhaust outlet 22 withdrawn and fed via a line 23 to the dynamic classifier 19. Via a arranged in the line 23 flap 24 of the branched off from the lower viewing space 17 partial flow is adjusted to thereby also affect the visibility in the transverse vision zone in the upper viewing space 16 targeted. A withdrawn via line 23 amount of visible gas reduces the amount of visible gas flowing through the vent bottom 7 accordingly. In this way, the visual gas velocity distribution of the static classifier 3 for the dynamic classifier 19 can be optimized without the attendant aeration bottom failure, ie the material falling through the aeration bottom, can adversely affect the entire process.

Wie aus den Figuren 1 und 2 deutlich hervorgeht, ist der Sichtguteinlass 4 auf der dem Förderwerk 2 zugewandten Seite des Sichters angeordnet, während der Sichtgaseinlass 18 für das Sichtgas 6 in einem vom Förderwerk abgewandten Bereich, hier auf der gegenüberliegenden Seite, an den Sichter 3 angeschlossen ist. Selbstverständlich ist es im Rahmen der Erfindung auch möglich, dass das Sichtgas über zwei oder mehrere Sichtgaseinlässe zugeführt wird. Dabei kommt insbesondere auch eine seitliche Zuführung in Betracht. Der Winkel zwischen der Ausrichtung des Sichtguteinlasses 4 und des Sichtgaseinlasses 18 sollte wenigstens 15° und höchstens 345° betragen, damit das Förderwerk 2 möglichst nahe am Sichter 3 angeordnet werden kann. Der Sichtgaseinlass 18 mit der angeschlossenen Sichtgasleitung 25 sollte daher nicht mit dem Förderwerk 2 in Konflikt kommen. Es muss insbesondere sichergestellt werden, dass die Transportrichtung des Fördergutes bis in den Sichter in gerader Linie (in der Draufsicht) verläuft und somit auch die Verbindung zwischen Förderwerk 2 und Sichtguteinlass 4 in gerader Linie angeordnet ist, um jegliche Materialumlenkungen, die zwangsläufig eine verschlechterte Breitenverteilung auf den Belüftungsboden bewirken, zu vermeiden.Like from the FIGS. 1 and 2 clearly shows, the Sichtguteinlass 4 is arranged on the conveyor 2 side facing the sifter, while the Sichtgaseinlass 18 is connected to the classifying gas 6 in a region facing away from the conveyor, here on the opposite side of the separator 3. Of course, it is within the scope of the invention also possible that the classifying gas is supplied via two or more Sichtgaseinlässe. In particular, a lateral feed into consideration. The angle between the orientation of the Sichtguteinlasses 4 and the Sichtgaseinlasses 18 should be at least 15 ° and at most 345 °, so that the conveyor 2 can be arranged as close to the classifier 3. The Sichtgaseinlass 18 with the connected sighting gas line 25 should therefore not come into conflict with the conveyor 2. In particular, it must be ensured that the transport direction of the conveyed material extends straight into the sifter (in plan view) and thus the connection between conveyor 2 and sifter inlet 4 is arranged in a straight line to any material deflections, which inevitably has a worsened width distribution on the aeration floor cause to avoid.

Die beiden Grobgutauslässe 8 und 21 ermöglichen ein uneingeschränktes Zurückführen des Grobgutes in den Mahl- und Sichtprozess. Der Belüftungsbodendurchfall stellt durch den zweiten Grobgutauslass 21 im unteren Sichtraum kein Problem mehr dar. Hierzu wird das über die Grobgutauslässe 8 und 21 des statischen Sichters 3 abgeführte Grobgut über ein zweites Förderwerk 26 nach oben gefördert, wobei das obere Ende über eine weitere Fördereinrichtung 27 mit dem Aufgabeschacht 1a der Walzenpresse 1 in Verbindung steht. Das zweite Förderwerk 26 wird zweckmäßigerweise wiederum als Becherwerk ausgebildet, wobei für die weitere Fördereinrichtung 27 ein Band- oder Gurtförderer in Betracht kommt. Im Bereich der weiteren Fördereinrichtung 27 ist ferner eine Metallausschleuseinrichtung 28 vorgesehen, über die etwaige aus dem Sichter fallende Metallteile vor der Walzenpresse 1 entfernt werden können, um dadurch eine Beschädigung oder Zerstörung der Walzenoberflächen zu vermeiden. Das Feingut 29 des dynamischen Sichters 19 wird zusammen mit dem Sichtgas einem Abscheider 30 zugeführt.The two coarse material outlets 8 and 21 allow an unrestricted return of the coarse material in the grinding and visual process. The ventilation floor throughput is through the second Grobgutauslass 21 in the lower For this purpose, the coarse material discharged via the coarse material outlets 8 and 21 of the static classifier 3 is conveyed upwards via a second conveyor 26, wherein the upper end is connected to the feed chute 1 a of the roller press 1 via a further conveyor 27. The second conveyor 26 is expediently again designed as a bucket elevator, with a belt or belt conveyor being considered for the further conveyor 27. In the area of the further conveying device 27, a metal discharge device 28 is furthermore provided, via which any metal parts falling from the separator can be removed in front of the roll press 1, in order to avoid damage or destruction of the roll surfaces. The fines 29 of the dynamic classifier 19 is supplied to a separator 30 together with the classifying gas.

Durch die erfindungsgemäße Anordnung von Walzenpresse, Förderwerk und Sichter kann die Bauhöhe deutlich reduziert werden. Darüber hinaus sind alle hohen Lasten nahe am Boden angeordnet, was auch eine einfachere Zugänglichkeit zu den einzelnen Maschinen bei Wartungsarbeiten ermöglicht. Weiterhin kann der Durchsatz durch den Einsatz von breiteren Sichtern gesteigert werden. Auch die geringeren Höhen der Förderwerke erhöhen die mechanische Sicherheit und ermöglichen dadurch höhere Umsätze.The inventive arrangement of roller press, conveyor and separator, the height can be significantly reduced. In addition, all high loads are located close to the ground, which also allows easier accessibility to the individual machines during maintenance. Furthermore, the throughput can be increased by the use of wider classifiers. The lower heights of the conveyors also increase mechanical safety and thus enable higher sales.

Claims (13)

  1. Grinding installation with
    - a roller press (1) for comminuting brittle grinding stock, which comprises two counter-rotating grinding rollers,
    - a static classifier (3) with a classifying stock inlet (4) for fresh grinding stock (5) and/or grinding stock (5) comminuted in the roller press (1), an aeration plate (7) which is arranged at an angle to the horizontal and through which classifying gas flows, a first outlet (8), for oversized material, which is connected to the roller press and an outlet (9) for fine material, and
    - with a conveying mechanism (2) which is connected to the roller press (1) and the classifying stock inlet (4) of the classifier (3) in order to raise the fresh grinding stock (5) and/or grinding stock (5) comminuted in the roller press,
    characterized in that
    - the roller press (1), the conveying mechanism (2) and the classifier (3) are arranged one next to the other in terms of construction and in a straight line one behind the other in terms of the material flow direction,
    - the classifying stock inlet (4) is arranged on that side of the classifier (3) which is oriented toward the conveying mechanism (2),
    - the classifier (3) has a classifying gas inlet (18) for the classifying gas (6), which is connected on the classifier (3) in a region which is oriented away from the conveying mechanism (2),
    - wherein the classifier (3) further has two classifying spaces (16, 17) which are arranged one above the other and are separated from one another by the aeration plate (7),
    - wherein the classifying stock inlet (4) for the fresh grinding stock (5) and/or the grinding stock (5) comminuted in the roller press opens into the upper classifying space (16) and the classifying gas inlet (18) is connected to the lower classifying space (17),
    - and wherein the first outlet (8) for oversized material is connected to the upper classifying space (16) and the lower classifying space (17) is provided with a second outlet (21) for oversized material.
  2. Grinding installation according to Claim 1, characterized in that the angle between the orientation of the classifying stock inlet (4) and that of the classifying gas inlet (18) is at least 15° and at most 345°.
  3. Grinding installation according to Claim 1, characterized in that the conveying mechanism (2) is formed as a vertical conveying mechanism, in particular as a bucket elevator or as an inclined belt conveyer.
  4. Grinding installation according to Claim 1, characterized in that the conveying mechanism (2) has a lower end (2b) and an upper end (2a), wherein the upper end (2a) is connected to the classifying stock inlet (4) of the classifier (3) via a chute (10).
  5. Grinding installation according to Claim 1, characterized in that the conveying mechanism (2) has a lower end (2b) and an upper end (2a), wherein the upper end (2a) is connected to the classifying stock inlet (4) of the classifier (3) and the lower end (2b) is connected via a conveying device (11) to the roller press (1) and to a fresh material feed (12).
  6. Grinding installation according to Claim 1, characterized in that the second classifying space (17) has an inclined bed (20) at the lower end of which is arranged the second outlet (21) for oversized material.
  7. Grinding installation according to Claim 1, characterized in that the outlet (9) for fine material is connected to a dynamic classifier (19) such that the fine material from the static classifier (3) arrives, together with the classifying air, in the dynamic classifier (19).
  8. Grinding installation according to Claim 7, characterized in that the static classifier (3) and the dynamic classifier (19) are housed in a common classifier housing.
  9. Grinding installation according to Claim 7, characterized in that the dynamic classifier (19) is connected to a separation device (30) arranged downstream.
  10. Grinding installation according to Claim 1, characterized in that there is provided a second conveying mechanism (26) which is connected to the outlets (8, 21) for oversized material of the static classifier (3) and to the roller press (1).
  11. Grinding installation according to Claim 10, characterized in that the second conveying mechanism (26) has a lower end and an upper end, wherein the lower end is connected to the outlets (8, 21) for oversized material of the static classifier (3) and the upper end is connected via a conveying device (27) to the roller press (1).
  12. Grinding installation according to Claim 11, characterized in that a metal ejection device (28) is provided in the region of the conveying device (27) leading to the roller press (1).
  13. Grinding installation according to Claim 1, characterized in that the width of the conveying mechanism (2) essentially corresponds to the width of the classifying stock inlet (4) of the classifier (3).
EP13777001.2A 2012-10-10 2013-10-09 Grinding mill Active EP2906349B1 (en)

Applications Claiming Priority (2)

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DE102012109644.9A DE102012109644B4 (en) 2012-10-10 2012-10-10 grinding plant
PCT/EP2013/071031 WO2014056974A1 (en) 2012-10-10 2013-10-09 Grinding mill

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CN (1) CN104853847B (en)
AU (1) AU2013328753B2 (en)
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CA (1) CA2887631C (en)
CL (1) CL2015000888A1 (en)
DE (1) DE102012109644B4 (en)
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MX2015004405A (en) 2015-09-25
CA2887631A1 (en) 2014-04-17
CN104853847A (en) 2015-08-19
WO2014056974A1 (en) 2014-04-17
DE102012109644A1 (en) 2014-05-15
MX355558B (en) 2018-04-23
DK2906349T3 (en) 2016-11-28
CA2887631C (en) 2020-01-07
AU2013328753A1 (en) 2015-04-30
CN104853847B (en) 2017-09-08
DE102012109644B4 (en) 2016-02-11
BR112015007989A2 (en) 2017-07-04
AU2013328753B2 (en) 2017-05-04
US9630214B2 (en) 2017-04-25
CL2015000888A1 (en) 2015-11-06
PE20151160A1 (en) 2015-08-29
IN2015DN03737A (en) 2015-09-18
EP2906349A1 (en) 2015-08-19
US20150258576A1 (en) 2015-09-17

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