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EP2817100B1 - Vertical roller mill and method for operating a vertical roller mill - Google Patents

Vertical roller mill and method for operating a vertical roller mill Download PDF

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Publication number
EP2817100B1
EP2817100B1 EP13701064.1A EP13701064A EP2817100B1 EP 2817100 B1 EP2817100 B1 EP 2817100B1 EP 13701064 A EP13701064 A EP 13701064A EP 2817100 B1 EP2817100 B1 EP 2817100B1
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EP
European Patent Office
Prior art keywords
grinding
roller
plate
driven
braked
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Not-in-force
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EP13701064.1A
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German (de)
French (fr)
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EP2817100A2 (en
Inventor
Markus Berger
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ThyssenKrupp Industrial Solutions AG
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ThyssenKrupp Industrial Solutions AG
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Publication of EP2817100A2 publication Critical patent/EP2817100A2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/006—Ring or disc drive gear arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/14—Edge runners, e.g. Chile mills

Definitions

  • the invention relates to a vertical roller mill and a method for operating a vertical roller mill whose grinding units, consisting of a grinding plate and at least one grinding roller, cooperate such that grinding material is comminuted between the grinding plate and the at least one grinding roller, wherein at least one grinding unit driven and at least one grinding unit is being towed.
  • a roller mill with a rotatably mounted about a vertical axis table which is provided with an annular groove in its upper side and cooperates with convex grinding rollers, which forms a gap between the spherical peripheral part of the grinding rollers and the annular groove, crushed in the ground material and crushed.
  • the present invention is therefore based on the object to improve the vertical roller mill and the method for operating the vertical roller mill to the effect that the fines per MahltechnikmaschinectionAND (crushing progress during the stress in the grinding bed between the grinding roller and grinding plate) is increased.
  • its grinding units consisting of a grinding plate and at least one grinding roller, cooperate in such a way that the material to be ground in the grinding bed is between the grinding plate and the at least one grinding roller is comminuted, wherein at least one grinding unit is driven and at least one grinding unit is towed, and the towed grinding unit is braked to increase the flow of energy through the grinding bed between the grinding table and the at least one grinding roller.
  • the vertical roller mill according to the invention has at least one driven and at least one towed grinding unit, wherein the grinding units are formed by a grinding table and at least one grinding roller, which cooperate in such a way that ground material is comminuted in the grinding bed between the grinding table and the at least one grinding roller.
  • the towed grinding aggregate also acts to increase the flow of energy through the grinding bed between the grinding table and the at least one grinding roller with a braking device for braking the towed grinding aggregate.
  • the towed grinding unit is not driven by a drive, but only rotated about the material to be ground in rotation.
  • the increase in the energy flow through the grinding bed results in an increase in the slip between the grinding table and the at least one grinding roller, which will be described below with reference to FIGS FIGS. 1 to 3 is explained in more detail.
  • a grinding table 1 a grinding roller 2 and the grinding bed 3 are shown schematically.
  • the force application point of the grinding roller 2 on the grinding bed 3 is indicated by the reference numeral 4.
  • the slip is defined by the differential speed ⁇ v S between the peripheral speed of the grinding roller 2 in the force application point 4 and the peripheral speed of the grinding table 1 in the force application point (radius R K ) projected vertically downwards onto the grinding table 1.
  • Fig. 2 shows an example with driven grinding roller 2 and dragged grinding table 1 in the region of the force application point 4. It is clear that the upper, coming into contact with the grinding roller 2 layer of the grinding bed 3, a higher speed than those with the towed grinding plate 1 in contact having lower layer. The difference between the highest and the lowest speed is referred to as slip ⁇ v S1 .
  • Fig. 3 the trailed grinding table 1 is additionally braked. While the speed of the uppermost layer of the grinding bed 3 remains substantially unchanged, the speed of the lower layer in contact with the grinding table 1 is reduced. Accordingly, the slip ⁇ v S2 is in Fig. 3 greater than the slip ⁇ v S1 in the situation according to Fig. 2 , On the other hand, if the grinding plate speed is influenced by regulation (eg constant speed), then the speed of the layer in contact with the grinding roller 2 increases.
  • regulation eg constant speed
  • the resulting slip ⁇ v S1 of Fig. 2 depends mainly on the force exerted on the grinding bed on the grinding bed normal force, the grinding bed 3 of the geometry of grinding rollers and grinding table and the transmitted moment.
  • the braking of the grinding table 1 in Fig. 3 increases with the same normal force of the slip .DELTA.v S2 , resulting in an increased shear stress in the grinding bed 3. This in turn has an immediate effect on a higher fines content per run.
  • the increase in the energy flow through the grinding bed can be realized in various ways.
  • a grinding roller can be driven and the grinding table can be braked, or at least the grinding table can be driven and at least one grinding roller can be braked.
  • energy is generated during braking of a grinding unit, which is used to drive the other grinding unit.
  • the energy consumption of the entire system increases only slightly, whereas the grinding efficiency increases significantly with a desired target fineness.
  • the slip between the grinding plate and the at least one grinding roller is regulated within a predetermined range.
  • the rotational speed of the braked grinding unit can be determined and for Regulation can be used.
  • the slip between the grinding plate and at least one grinding roller is regulated as a function of the fines content of the comminuted material to be ground.
  • the braked grinding unit is advantageously braked relative to the driven grinding unit in such a way that the slip between the grinding plate and the at least one grinding roller is controlled within a range of 3-10%. Furthermore, the braked unit with respect to the driven grinding unit can be braked so that the slip between the grinding table and the at least one grinding roller relative to an unrestrained and merely towed grinding unit increased by 15-100%.
  • the at least one driven grinding unit can be formed by at least one grinding roller, which cooperates with a Mahlrollenantrieb and the at least one trailed grinding unit can be formed by the grinding table, which cooperates with a braking device.
  • the at least one driven grinding unit is formed by the grinding table, which cooperates with a Mahltellerantrieb and the at least one towed grinding unit is formed by at least one grinding roller, which cooperates with the braking device.
  • the braking action can be formed in particular by a generator.
  • two milling rollers 2, 5 are driven by associated Mahlrollenantriebe 6, 7.
  • the grinding table 1 is towed over the grinding bed 3 and is connected to a braking device 8 for controlling the slip between the grinding table 1 and the grinding rollers 2, 5 in operative connection.
  • a control device 9 is provided, which is in communication with the Mahlrollenantrieben 6, 7 and the braking device 8.
  • the actual slip can, for example, via sensors, in particular sensors for detecting the Revolution speeds of grinding plate 1 and possibly the grinding rollers 2, 5, are determined.
  • the braking device 8 is designed here as a generator to generate energy when braking the grinding plate 1, which can be used for the Mahlrollenantriebe 6 and / or 7 via a common intermediate energy storage device 14.
  • the grinding table 1 is driven via a grinding table drive 11. Furthermore, the grinding roller 2 is driven via the Mahlrollenantrieb 6. A grinding roller 12, however, is braked by a braking device 10. Again, the resulting braking energy for driving the grinding roller 2 and / or the grinding table 1 can be used. The slip between the grinding roller 12 and the grinding table 1 can be controlled again via the control device 9 in a predetermined range.
  • the variant according to Fig. 5 has the advantage of greater flexibility of the mill, in particular a higher proportion of fines can be realized with an increased throughput.
  • Fig. 6 and Fig. 7 the situation of slippage between a merely dragged or braked grinding roller and a driven grinding plate is shown, wherein the grinding roller 13 in Fig. 6 only dragged and the grinding roller 12 in Fig. 7 is additionally braked. Again, it can be seen that by the additional braking of the grinding roller 12, the slip between the grinding roller 12 and Grinding plate 1 or the shear stress within the grinding bed 3 is again increased ( ⁇ v S3 ⁇ v S4 ).
  • a grinding table 1 driven by a grinding table drive 11 is combined with a grinding roller 12 braked by a braking device 10 and a grinding roller 13 only towed.
  • the adjustment of the slip between the braked grinding roller 12 and the grinding table 1 is again via the control device 9.
  • the energy obtained during the braking process can be used to drive the grinding table 1.
  • the resulting slip in the area of the grinding rollers 12 and 13 is also from the 6 and 7 seen.
  • a braked grinding plate 1 is combined with a driven grinding roller 2 and a braked grinding roller 12.
  • Mahltellerantrieb 11 and braking device 10 of the grinding table are realized by an aggregate, which can optionally drives or brakes.
  • the Mahlrollenantriebe 6 and 7 and the braking device 12 may be formed by an aggregate, which can realize both tasks.
  • each of the additional grinding rollers can either be driven, braked or merely towed.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft eine Vertikalrollenmühle sowie ein Verfahren zum Betreiben einer Vertikalrollenmühle, dessen Mahlaggregate, bestehend aus einem Mahlteller und wenigstens einer Mahlrolle, derart zusammenwirken, dass Mahlgut zwischen dem Mahlteller und der wenigstens einen Mahlroller zerkleinert wird, wobei wenigstens ein Mahlaggregat angetrieben und wenigstens ein Mahlaggregat geschleppt wird.The invention relates to a vertical roller mill and a method for operating a vertical roller mill whose grinding units, consisting of a grinding plate and at least one grinding roller, cooperate such that grinding material is comminuted between the grinding plate and the at least one grinding roller, wherein at least one grinding unit driven and at least one grinding unit is being towed.

Für die Herstellung von pulverförmige Materialien für die Bindemittelindustrie werden zunehmend Vertikalrollenmühlen eingesetzt, die gegenüber anderen Mahlsystemen, wie z.B. Rohrmühlen, eine deutliche Energieeinsparung ermöglichen.For the production of powdery materials for the binder industry, there are increasingly used vertical roller mills which are superior to other milling systems, e.g. Tube mills, allow a significant energy savings.

Aus der DE 10 2007 033 256 A1 ist eine Vertikalrollenmühle mit angetriebenen Mahlteller bekannt, wobei der Mahlteller über das Mahlbett die Mahlrollen antreibt. Dies führt jedoch zu starken Leistungsschwankungen und somit zu hohen Belastungen des Antriebsstranges, was entsprechend hohe Sicherheitsfaktoren im Antriebsstrang bedarf. Hingegen ist die Leistungsaufnahme und auch die Zerkleinerung auch starken Schwankungen unterworfen und nur bedingt über das Materialbett steuerbar.From the DE 10 2007 033 256 A1 a vertical roller mill with driven grinding table is known, wherein the grinding table drives the grinding rollers on the grinding bed. However, this leads to strong power fluctuations and thus to high loads on the drive train, which requires correspondingly high safety factors in the drive train. By contrast, the power consumption and the crushing is also subject to strong fluctuations and controllable only conditionally on the material bed.

Aus der DE 35 20 937 A1 ist weiterhin eine Wälzmühle mit einem um eine vertikale Achse drehbar gelagerten Tisch bekannt, der mit einer Ringnut in seiner Oberseite versehen ist und mit ballig ausgebildeten Mahlrollen zusammenwirkt, wobei sich zwischen dem balligen Umfangsteil der Mahlrollen und der Ringnut ein Spalt ausbildet, in dem Mahlgut zerdrückt und zermahlen wird.From the DE 35 20 937 A1 Furthermore, a roller mill with a rotatably mounted about a vertical axis table is known, which is provided with an annular groove in its upper side and cooperates with convex grinding rollers, which forms a gap between the spherical peripheral part of the grinding rollers and the annular groove, crushed in the ground material and crushed.

Man hat daher in der DE 197 02 854 A1 bereits vorgeschlagen, die Mahlrollen anzutreiben. Dort wurde auch darauf hingewiesen, dass die einzelnen Mahlrollen einerseits über den Mahlteller und das darauf befindliche Mahlgut bzw. Mahlgutbett drehantriebsmäßig miteinander gekoppelt sind und andererseits aber stark unterschiedliche Leistungsaufnahmen haben können, die beispielsweise auf unterschiedliche Abrolldurchmesser auf dem Mahlteller (Abrollpunkt/Durchmesser), unterschiedliche Wirkdurchmesser der einzelnen Mahlrollen (z.B. durch Verschleiß) und auf ein unterschiedliches Einzugsverhalten des Mahlgutes im Zusammenwirken auf Mahlteller und Mahlrolle zurückzuführen sind.One has therefore in the DE 197 02 854 A1 already proposed to drive the grinding rollers. There it was also pointed out that the individual grinding rollers on the one hand on the grinding table and the grinding stock or Mahlgutbett are rotationally coupled to each other and on the other hand can have very different power consumption, for example different rolling diameters on the grinding plate (rolling point / diameter), different effective diameters of the individual grinding rollers (eg due to wear) and due to a different intake behavior of the ground material in interaction on grinding plate and grinding roller are due.

Bereits geringe Drehzahländerung zwischen einzelnen Mahlrollen bewirken bei den einzelnen Antrieben relativ hohe Leistungsschwankungen. Dies kann dazu führen, dass die Mahlrollen teilweise beschleunigt und verzögert werden, sodass die einzeln angetriebenen Mahlrollen gegeneinander arbeiten, was während des Zerkleinerungsbetriebes zu einem deutlich erhöhten Kraft- bzw. Energiebedarf führt.Even small changes in speed between individual grinding rollers cause relatively high power fluctuations in the individual drives. This can cause the grinding rollers to be partially accelerated and decelerated, so that the individually driven grinding rollers work against each other, which leads to a significantly increased power or energy consumption during the crushing operation.

In der DE 197 02 854 A1 wurde daher vorgeschlagen, dass die Betriebsschwankungen zwischen den einzelnen Drehantrieben aller angetriebenen Mahlrollen durch eine gemeinsame Leistungsausgleichsregelung ausgeglichen werden.In the DE 197 02 854 A1 Therefore, it has been proposed that the operating fluctuations between the individual rotary drives of all driven grinding rollers are compensated by a common power compensation control.

Der mit Vertikalmühlen erreichbare Feinstanteil des zu mahlenden Gutes ist allerdings geringer als bei anderen Mahlsystemen, wie z.B. Rohrmühlen ist, was sich bei der Herstellung von Bindemitteln ungünstig auf die Bindemitteleigenschaften auswirken kann.However, the achievable with vertical mills finest portion of the material to be ground is lower than in other grinding systems, such. Tube mills is what may adversely affect the binder properties in the production of binders.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, die Vertikalrollenmühle und das Verfahren zum Betreiben der Vertikalrollenmühle dahingehend zu verbessern, dass der Feinstanteil je Mahlwerkzeugkontakt (Zerkleinerungsfortschritt während der Beanspruchung im Mahlbett zwischen Mahlrolle und Mahlteller) erhöht wird.The present invention is therefore based on the object to improve the vertical roller mill and the method for operating the vertical roller mill to the effect that the fines per Mahlwerkzeugkontakt (crushing progress during the stress in the grinding bed between the grinding roller and grinding plate) is increased.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale der Ansprüche 1 und 10 gelöst.According to the invention, this object is solved by the features of claims 1 and 10.

Beim erfindungsgemäßen Verfahren zum Betreiben einer Vertikalrollenmühle wirken dessen Mahlaggregate, bestehend aus einem Mahlteller und wenigstens einer Mahlrolle, derart zusammen, dass Mahlgut im Mahlbett zwischen dem Mahlteller und der wenigstens einen Mahlrolle zerkleinert wird, wobei wenigstens ein Mahlaggregat angetrieben und wenigstens ein Mahlaggregat geschleppt wird, und das geschleppte Mahlaggregat zur Erhöhung des Energieflusses durch das Mahlbett zwischen dem Mahlteller und der wenigstens einen Mahlrolle gebremst wird.In the method according to the invention for operating a vertical roller mill, its grinding units, consisting of a grinding plate and at least one grinding roller, cooperate in such a way that the material to be ground in the grinding bed is between the grinding plate and the at least one grinding roller is comminuted, wherein at least one grinding unit is driven and at least one grinding unit is towed, and the towed grinding unit is braked to increase the flow of energy through the grinding bed between the grinding table and the at least one grinding roller.

Die erfindungsgemäße Vertikalrollenmühle weist wenigstens ein angetriebenes und wenigstens ein geschlepptes Mahlaggregat auf, wobei die Mahlaggregate durch einen Mahlteller und wenigstens eine Mahlrolle gebildet werden, die derart zusammenwirken, dass Mahlgut im Mahlbett zwischen dem Mahlteller und der wenigstens einen Mahlrolle zerkleinert wird. Das geschleppte Mahlaggregat wirkt außerdem zu Erhöhung des Energieflusses durch das Mahlbett zwischen dem Mahlteller und der wenigstens einen Mahlrolle mit einer Bremseinrichtung zum Bremsen des geschleppten Mahlaggregats zusammen.The vertical roller mill according to the invention has at least one driven and at least one towed grinding unit, wherein the grinding units are formed by a grinding table and at least one grinding roller, which cooperate in such a way that ground material is comminuted in the grinding bed between the grinding table and the at least one grinding roller. The towed grinding aggregate also acts to increase the flow of energy through the grinding bed between the grinding table and the at least one grinding roller with a braking device for braking the towed grinding aggregate.

Das geschleppte Mahlaggregats wird nicht durch einen Antrieb angetrieben, sondern lediglich über das Mahlgut in Drehung versetzt.The towed grinding unit is not driven by a drive, but only rotated about the material to be ground in rotation.

Die Erhöhung des Energieflusses durch das Mahlbett resultiert in einer Erhöhung des Schlupfes zwischen Mahlteller und der wenigstens einen Mahlrolle, was im Folgenden anhand der Figuren 1 bis 3 näher erläutert wird. Dort sind ein Mahlteller 1, eine Mahlrolle 2 und das Mahlbett 3 schematisch dargestellt. Der Kraftangriffspunkt der Mahlrolle 2 auf dem Mahlbett 3 ist mit dem Bezugszeichen 4 gekennzeichnet. Der Schlupf wird durch die Differenzgeschwindigkeit ΔvS zwischen der Umfangsgeschwindigkeit der Mahlrolle 2 im Kraftangriffspunkt 4 und der Umfangsgeschwindigkeit des Mahltellers 1 im senkrecht nach unten auf den Mahlteller 1 projizierten Kraftangriffspunkt (Radius RK) definiert.The increase in the energy flow through the grinding bed results in an increase in the slip between the grinding table and the at least one grinding roller, which will be described below with reference to FIGS FIGS. 1 to 3 is explained in more detail. There, a grinding table 1, a grinding roller 2 and the grinding bed 3 are shown schematically. The force application point of the grinding roller 2 on the grinding bed 3 is indicated by the reference numeral 4. The slip is defined by the differential speed Δv S between the peripheral speed of the grinding roller 2 in the force application point 4 and the peripheral speed of the grinding table 1 in the force application point (radius R K ) projected vertically downwards onto the grinding table 1.

Fig. 2 zeigt ein Beispiel mit angetriebener Mahlrolle 2 und geschlepptem Mahlteller 1 im Bereich des Kraftangriffspunktes 4. Dabei ist klar ersichtlich, dass die obere, mit der Mahlrolle 2 in Kontakt kommende Schicht des Mahlbettes 3 eine höhere Geschwindigkeit als die mit dem geschleppten Mahlteller 1 in Kontakt stehende untere Schicht aufweist. Die Differenz zwischen der größten und der kleinsten Geschwindigkeit wird als Schlupf ΔvS1 bezeichnet. Fig. 2 shows an example with driven grinding roller 2 and dragged grinding table 1 in the region of the force application point 4. It is clear that the upper, coming into contact with the grinding roller 2 layer of the grinding bed 3, a higher speed than those with the towed grinding plate 1 in contact having lower layer. The difference between the highest and the lowest speed is referred to as slip Δv S1 .

In Fig. 3 wird der geschleppte Mahlteller 1 zusätzlich gebremst. Währen die Geschwindigkeit der obersten Schicht des Mahlbettes 3 im Wesentlichen unverändert bleibt, wird die Geschwindigkeit der mit dem Mahlteller 1 in Kontakt stehenden unteren Schicht verringert. Dementsprechend ist der Schlupf ΔvS2 in Fig. 3 größer als der Schlupf ΔvS1 in der Situation gemäß Fig. 2. Wird die Mahltellergeschwindigkeit hingegen durch eine Regelung beeinflusst (z.B. konstante Geschwindigkeit), so erhöht sich die Geschwindigkeit der mit der Mahlrolle 2 in Kontakt stehende Schicht.In Fig. 3 the trailed grinding table 1 is additionally braked. While the speed of the uppermost layer of the grinding bed 3 remains substantially unchanged, the speed of the lower layer in contact with the grinding table 1 is reduced. Accordingly, the slip Δv S2 is in Fig. 3 greater than the slip Δv S1 in the situation according to Fig. 2 , On the other hand, if the grinding plate speed is influenced by regulation (eg constant speed), then the speed of the layer in contact with the grinding roller 2 increases.

Der sich einstellende Schlupf ΔvS1 der Fig. 2 hängt im Wesentlichen von der über die Mahlrolle auf das Mahlbett ausgeübten Normalkraft, dem Mahlbett 3 der Geometrie von Mahlrollen und Mahlteller sowie dem übertragenen Moment ab. Durch das gezielte Bremsen eines Mahlaggregats (Energieflusserhöhung durch das Mahlbett), hier dem Bremsen des Mahltellers 1 in Fig. 3, erhöht sich bei gleicher Normalkraft der Schlupf ΔvS2, wobei es zu einer erhöhten Scherbelastung im Mahlbett 3 kommt. Dies wiederum wirkt sich unmittelbar auf einen höheren Feinstanteil pro Durchlauf aus.The resulting slip Δv S1 of Fig. 2 depends mainly on the force exerted on the grinding bed on the grinding bed normal force, the grinding bed 3 of the geometry of grinding rollers and grinding table and the transmitted moment. By targeted braking of a grinding unit (energy flow increase through the grinding bed), here the braking of the grinding table 1 in Fig. 3 , increases with the same normal force of the slip .DELTA.v S2 , resulting in an increased shear stress in the grinding bed 3. This in turn has an immediate effect on a higher fines content per run.

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

Die Erhöhung des Energieflusses durch das Mahlbett kann auf verschiedene Art und Weise realisiert werden. So kann beispielsweise eine Mahlrolle angetrieben und der Mahlteller gebremst werden oder wenigstens der Mahlteller angetrieben und wenigstens eine Mahlrolle gebremst werden. Gemäß einer bevorzugten Ausgestaltung der Erfindung wird beim Bremsen des einen Mahlaggregats Energie erzeugt, die zum Antreiben des anderen Mahlaggregats genutzt wird. Durch die Rückspeisung der Bremsenergie steigt der Energieverbrauch des Gesamtsystems daher nur geringfügig an, während die Mahleffizienz bei einer gewünschten Zielfeinheit hingegen deutlich zunimmt.The increase in the energy flow through the grinding bed can be realized in various ways. For example, a grinding roller can be driven and the grinding table can be braked, or at least the grinding table can be driven and at least one grinding roller can be braked. According to a preferred embodiment of the invention, energy is generated during braking of a grinding unit, which is used to drive the other grinding unit. As a result of the regeneration of the braking energy, the energy consumption of the entire system increases only slightly, whereas the grinding efficiency increases significantly with a desired target fineness.

Des Weiteren kann vorgesehen werden, dass zur Regelung des Energieflusses durch das Mahlbett der Schlupf zwischen dem Mahlteller und der wenigstens eine Mahlrolle in einem vorgegebenen Bereich geregelt wird. Hierzu kann insbesondere die Umdrehungsgeschwindigkeit des gebremsten Mahlaggregats ermittelt und zur Regelung verwendet werden. Des Weiteren ist es denkbar, dass der Schlupf zwischen dem Mahlteller und wenigstens einer Mahlrolle in Abhängigkeit des Feinstanteils des zerkleinerten Mahlguts geregelt wird.Furthermore, it can be provided that, in order to regulate the energy flow through the grinding bed, the slip between the grinding plate and the at least one grinding roller is regulated within a predetermined range. For this purpose, in particular the rotational speed of the braked grinding unit can be determined and for Regulation can be used. Furthermore, it is conceivable that the slip between the grinding plate and at least one grinding roller is regulated as a function of the fines content of the comminuted material to be ground.

Bei den die Erfindung zugrundeliegenden Versuchen hat sich gezeigt, dass das gebremste Mahlaggregat gegenüber dem angetriebenen Mahlaggregat zweckmäßigerweise so gebremst wird, dass der Schlupf zwischen dem Mahlteller und der wenigstens einen Mahlrolle in einem Bereich von 3-10% geregelt wird. Weiterhin kann das gebremste Aggregat gegenüber dem angetriebenen Mahlaggregat derart gebremst werden, dass sich der Schlupf zwischen dem Mahlteller und der wenigstens einen Mahlrolle gegenüber einem ungebremsten und lediglich geschleppten Mahlaggregat um 15-100% erhöht.In the experiments on which the invention is based, it has been shown that the braked grinding unit is advantageously braked relative to the driven grinding unit in such a way that the slip between the grinding plate and the at least one grinding roller is controlled within a range of 3-10%. Furthermore, the braked unit with respect to the driven grinding unit can be braked so that the slip between the grinding table and the at least one grinding roller relative to an unrestrained and merely towed grinding unit increased by 15-100%.

Bei der körperlichen Ausgestaltung der Vertikalrollenmühle kann das wenigstens eine angetriebene Mahlaggregat durch wenigstens eine Mahlrolle gebildet werden, die mit einem Mahlrollenantrieb zusammenwirkt und das wenigstens eine geschleppte Mahlaggregat kann durch den Mahlteller gebildet werden, der mit einer Bremseinrichtung zusammenwirkt. Es wäre aber auch denkbar, dass das wenigstens eine angetriebene Mahlaggregat durch den Mahlteller gebildet wird, der mit einem Mahltellerantrieb zusammenwirkt und das wenigstens eine geschleppte Mahlaggregat durch wenigstens eine Mahlrolle gebildet wird, die mit der Bremseinrichtung zusammenwirkt. Die Bremseinwirkung kann insbesondere durch einen Generator gebildet werden.In the physical configuration of the vertical roller mill, the at least one driven grinding unit can be formed by at least one grinding roller, which cooperates with a Mahlrollenantrieb and the at least one trailed grinding unit can be formed by the grinding table, which cooperates with a braking device. But it would also be conceivable that the at least one driven grinding unit is formed by the grinding table, which cooperates with a Mahltellerantrieb and the at least one towed grinding unit is formed by at least one grinding roller, which cooperates with the braking device. The braking action can be formed in particular by a generator.

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

In der Zeichnung zeigen

Fig. 1
eine schematische Detailansicht der Vertikalrollenmühle zur Erläuterung des Kraftangriffspunktes,
Fig. 2
eine schematische Darstellung des Schlupfes bei angetriebener Mahlrolle und geschlepptem Mahlteller,
Fig. 3
eine schematische Darstellung des Schlupfes bei angetriebener Mahlrolle und gebremstem Mahlteller,
Fig. 4
eine schematische Darstellung einer Vertikalrollenmühle mit angetriebenen Mahlrollen und gebremstem Mahlteller,
Fig. 5
eine schematische Darstellung einer Vertikalrollenmühle mit angetriebenem Mahlteller und einer angetriebenen und einer gebremsten Mahlrolle,
Fig. 6
eine schematische Darstellung des Schlupfes bei angetriebenem Mahlteller und geschleppter Mahlrolle,
Fig. 7
eine schematische Darstellung des Schlupfes bei angetriebenem Mahlteller und gebremster Mahlrolle,
Fig. 8
eine schematische Darstellung einer Vertikalrollenmühle mit angetriebenem Mahlteller und einer gebremsten und einer geschleppten Mahlrolle und
Fig. 9
eine schematische Darstellung einer Vertikalrollenmühle mit gebremstem Mahlteller und einer gebremsten und einer angetriebenen Mahlrolle.
In the drawing show
Fig. 1
a schematic detail view of the vertical roller mill for explaining the force application point,
Fig. 2
a schematic representation of the slip with driven grinding roller and dragged grinding plate,
Fig. 3
a schematic representation of the slip with driven grinding roller and braked grinding plate,
Fig. 4
a schematic representation of a vertical roller mill with driven grinding rollers and braked grinding plate,
Fig. 5
a schematic representation of a vertical roller mill with driven grinding plate and a driven and a braked grinding roller,
Fig. 6
a schematic representation of the slip with driven grinding table and dragged grinding roller,
Fig. 7
a schematic representation of the slip with driven grinding table and braked grinding roller,
Fig. 8
a schematic representation of a vertical roller mill with driven grinding table and a braked and a towed grinding roller and
Fig. 9
a schematic representation of a vertical roller mill with braked grinding plate and a braked and a driven grinding roller.

Im Ausführungsbeispiel gemäß Fig. 4 werden zwei Mahlrollen 2, 5 über zugehörige Mahlrollenantriebe 6, 7 angetrieben. Der Mahlteller 1 wird über das Mahlbett 3 geschleppt und steht mit einer Bremseinrichtung 8 zur Regelung des Schlupfes zwischen dem Mahlteller 1 und den Mahlrollen 2, 5 in Wirkverbindung. Weiterhin ist eine Regeleinrichtung 9 vorgesehen, die mit den Mahlrollenantrieben 6, 7 und der Bremseinrichtung 8 in Verbindung steht. Der tatsächlich vorhandene Schlupf kann beispielsweise über Sensoren, insbesondere Sensoren zum Erfassung der Umdrehungsgeschwindigkeiten von Mahlteller 1 und ggf. den Mahlrollen 2, 5, ermittelt werden.In the embodiment according to Fig. 4 two milling rollers 2, 5 are driven by associated Mahlrollenantriebe 6, 7. The grinding table 1 is towed over the grinding bed 3 and is connected to a braking device 8 for controlling the slip between the grinding table 1 and the grinding rollers 2, 5 in operative connection. Furthermore, a control device 9 is provided, which is in communication with the Mahlrollenantrieben 6, 7 and the braking device 8. The actual slip can, for example, via sensors, in particular sensors for detecting the Revolution speeds of grinding plate 1 and possibly the grinding rollers 2, 5, are determined.

Die Bremseinrichtung 8 ist hier als Generator ausgebildet, um beim Abbremsen des Mahltellers 1 Energie zu erzeugen, die für die Mahlrollenantriebe 6 und/oder 7 über einen gemeinsamen Energiezwischenspeicher 14 verwendet werden kann.The braking device 8 is designed here as a generator to generate energy when braking the grinding plate 1, which can be used for the Mahlrollenantriebe 6 and / or 7 via a common intermediate energy storage device 14.

Wird der Mahlteller 1 gemäß Fig. 4 nicht zusätzlich gebremst, würde sich ein Schlupf ΔvS1 gemäß Fig. 2 einstellen. Wird der Mahlteller 1 zusätzlich über die Bremseinrichtung 8 abgebremst, erhöht sich gemäß Fig. 3 der Schlupf auf ΔvS2. Dadurch wird eine erhöhte Scherbelastung innerhalb des Mahlbettes 3 erzeugt, da sich die Differenzgeschwindigkeit innerhalb des Mahlbettes vergrößert. Die zusätzliche Scherbelastung bewirkt einen höheren Feinstanteil pro Durchlauf. Man kann sich daher eine Regelung des Schlupfes auch in Abhängigkeit des Feinstanteils des zerkleinerten Mahlguts vorstellen. Hierzu würde man den Feinstanteil im zerkleinerten Mahlgut ermitteln und zur Regelung heranziehen.If the grinding table 1 according Fig. 4 not additionally braked, would slip Δv S1 according to Fig. 2 to adjust. If the grinding table 1 is additionally braked via the braking device 8, it increases in accordance with Fig. 3 the slip on Δv S2 . As a result, an increased shear stress is generated within the grinding bed 3, since the differential speed increases within the grinding bed. The additional shear load causes a higher fines content per run. It is therefore possible to imagine a control of the slip also as a function of the fines content of the comminuted regrind. For this purpose, one would determine the fines in the crushed millbase and use it for control.

Im Ausführungsbeispiel gemäß Fig. 5 wird der Mahlteller 1 über einen Mahltellerantrieb 11 angetrieben. Weiterhin wird die Mahlrolle 2 über den Mahlrollenantrieb 6 angetrieben. Eine Mahlrolle 12 wird hingegen über eine Bremseinrichtung 10 abgebremst. Auch hier kann die dabei entstehende Bremsenergie zum Antrieb der Mahlrolle 2 und/oder des Mahltellers 1 verwendet werden. Der Schlupf zwischen Mahlrolle 12 und Mahlteller 1 kann wieder über die Regeleinrichtung 9 in einem vorgegebenen Bereich geregelt werden. Die Variante gemäß Fig. 5 hat den Vorteil einer größeren Flexibilität der Mühle, wobei insbesondere ein höherer Feingutanteil mit einem gesteigerten Durchsatz realisiert werden kann.In the embodiment according to Fig. 5 the grinding table 1 is driven via a grinding table drive 11. Furthermore, the grinding roller 2 is driven via the Mahlrollenantrieb 6. A grinding roller 12, however, is braked by a braking device 10. Again, the resulting braking energy for driving the grinding roller 2 and / or the grinding table 1 can be used. The slip between the grinding roller 12 and the grinding table 1 can be controlled again via the control device 9 in a predetermined range. The variant according to Fig. 5 has the advantage of greater flexibility of the mill, in particular a higher proportion of fines can be realized with an increased throughput.

In Fig. 6 und Fig. 7 ist die Situation des Schlupfes zwischen einer lediglich geschleppten bzw. gebremsten Mahlrolle und einem angetriebenen Mahlteller dargestellt, wobei die Mahlrolle 13 in Fig. 6 lediglich geschleppt und die Mahlrolle 12 in Fig. 7 zusätzlich gebremst wird. Auch hier ist ersichtlich, dass durch das zusätzliche Bremsen der Mahlrolle 12 der Schlupf zwischen Mahlrolle 12 und Mahlteller 1 bzw. die Scherbelastung innerhalb des Mahlbettes 3 wiederum erhöht wird (ΔvS3 < ΔvS4).In Fig. 6 and Fig. 7 the situation of slippage between a merely dragged or braked grinding roller and a driven grinding plate is shown, wherein the grinding roller 13 in Fig. 6 only dragged and the grinding roller 12 in Fig. 7 is additionally braked. Again, it can be seen that by the additional braking of the grinding roller 12, the slip between the grinding roller 12 and Grinding plate 1 or the shear stress within the grinding bed 3 is again increased (Δv S3 <Δv S4 ).

In Fig. 8 wird ein über einen Mahltellerantrieb 11 angetriebener Mahlteller 1 mit einer über einen Bremseinrichtung 10 gebremsten Mahlrolle 12 und einer lediglich geschleppten Mahlrolle 13 kombiniert. Die Einstellung des Schlupfes zwischen der gebremsten Mahlrolle 12 und dem Mahlteller 1 erfolgt wiederum über die Regeleinrichtung 9. Auch die beim Bremsvorgang gewonnene Energie kann zum Antrieb des Mahltellers 1 genutzt werden. Der sich so ergebene Schlupf im Bereich der Mahlrollen 12 und 13 ist ebenfalls aus den Fig. 6 und 7 ersichtlich.In Fig. 8 For example, a grinding table 1 driven by a grinding table drive 11 is combined with a grinding roller 12 braked by a braking device 10 and a grinding roller 13 only towed. The adjustment of the slip between the braked grinding roller 12 and the grinding table 1 is again via the control device 9. The energy obtained during the braking process can be used to drive the grinding table 1. The resulting slip in the area of the grinding rollers 12 and 13 is also from the 6 and 7 seen.

In Fig. 9 ist schließlich ein Ausführungsbeispiel dargestellt, wo ein gebremster Mahlteller 1 mit einer angetriebenen Mahlrolle 2 und einer gebremster Mahlrolle 12 kombiniert ist.In Fig. 9 Finally, an embodiment is shown, where a braked grinding plate 1 is combined with a driven grinding roller 2 and a braked grinding roller 12.

Zweckmäßigerweisen werden Mahltellerantrieb 11 und Bremseinrichtung 10 des Mahltellers durch ein Aggregat verwirklicht, das wahlweise Antrieben oder Bremsen kann. Auch die Mahlrollenantriebe 6 bzw. 7 und die Bremseinrichtung 12 können durch ein Aggregat gebildet werden, das beide Aufgabenstellungen verwirklichen kann.Appropriately Mahltellerantrieb 11 and braking device 10 of the grinding table are realized by an aggregate, which can optionally drives or brakes. The Mahlrollenantriebe 6 and 7 and the braking device 12 may be formed by an aggregate, which can realize both tasks.

Bei allen dargestellten Varianten können selbstverständlich auch mehr als zwei Mahlrollen vorgesehen werden, wobei jede der zusätzlichen Mahlrollen entweder angetrieben, gebremst oder lediglich geschleppt sein können.Of course, in all variants shown, more than two grinding rollers can be provided, wherein each of the additional grinding rollers can either be driven, braked or merely towed.

Bei den der Erfindung zugrundeliegenden Versuchen hat sich gezeigt, dass ein Schlupf zwischen einem angetriebenen und einem gebremsten Mahlaggregat zweckmäßigerweise in einem Bereich von 3-10% zu regeln ist, um einerseits den Feinstanteil deutlich zu erhöhen und andererseits den zusätzlichen Energieaufwand in einem vertretbaren Rahmen zu halten. Dies bedeutet, dass die Geschwindigkeit des Mahlbettes im Kontaktbereich des angetriebenen Mahlaggregats um 3-10% höher als die Geschwindigkeit des Mahlbettes im Kontaktbereich des gebremsten Mahlaggregats ist.In the experiments on which the invention is based, it has been found that a slippage between a driven and a braked grinding aggregate is expediently to be regulated in a range of 3-10% in order on the one hand to considerably increase the microfine content and, on the other hand, to increase the energy requirement within a reasonable range hold. This means that the speed of the grinding bed in the contact area of the driven grinding unit is 3-10% higher than the speed of the grinding bed in the contact area of the braked grinding unit.

Claims (14)

  1. Method for operating a vertical roller mill of which the grinding assemblies, which are composed of a grinding plate (1) and at least one grinding roller (2, 5, 12, 13), interact in such a manner that material to be ground is comminuted in the grinding bed between the grinding plate (1) and the at least one grinding roller (2, 5, 12, 13), wherein at least one grinding assembly is driven and at least one grinding assembly is trailed,
    characterized in that, for increasing the flow of energy through the grinding bed between the grinding plate and the at least one grinding roller, the trailed grinding assembly is braked.
  2. Method according to Claim 1, characterized in that at least one grinding roller (2, 5) is driven and the grinding plate (1) is braked.
  3. Method according to Claim 1, characterized in that at least the grinding plate (1) is driven and at least one grinding roller (12) is braked.
  4. Method according to Claim 1, characterized in that, during braking of one grinding assembly, energy which is used for driving the other grinding assembly is generated.
  5. Method according to Claim 1, characterized in that the flow of energy through the grinding bed is regulated in a prespecified range by slippage (ΔvS2; ΔvS4) which arises between the grinding plate (1) and the at least one grinding roller (2, 5, 12).
  6. Method according to Claim 5, characterized in that for regulating slippage (ΔvS2; ΔvS4) between the grinding plate (1) and the at least one grinding roller (2, 5, 12) the rotational speed of the braked grinding assembly is determined.
  7. Method according to Claim 5, characterized in that the braked grinding assembly is braked in such a manner in relation to the driven grinding assembly that slippage (ΔvS2; ΔvS4) between the grinding plate (1) and the at least one grinding roller (2, 5, 12) is regulated in a range of 3 to 10%.
  8. Method according to Claim 5, characterized in that slippage (ΔvS2; ΔvS4) between the grinding plate (1) and the at least one grinding roller (2, 5, 12) is regulated depending on the fines content of the comminuted material to be ground.
  9. Method according to Claim 5, characterized in that the braked grinding assembly is braked in such a manner in relation to the driven grinding assembly that slippage (ΔvS2; ΔvS4) between the grinding plate (1) and the at least one grinding roller (2, 5, 12), in relation to an unbraked and merely trailed grinding assembly, is increased by 15 to 100%.
  10. Vertical roller mill having at least one driven and at least one trailed grinding assembly which are formed by a grinding plate (1) and at least one grinding roller (2, 5, 12, 13) which interact in such a manner that material to be ground is comminuted in the grinding bed between the grinding plate and the at least one grinding roller (2, 5, 12, 13),
    characterized in that, for increasing the flow of energy through the grinding bed between the grinding plate (1) and the at least one grinding roller (2, 5, 12), the trailed grinding assembly interacts with a brake unit (8, 10) for braking the trailed grinding assembly.
  11. Vertical roller mill according to Claim 10, characterized in that the at least one driven grinding assembly is formed by at least one grinding roller (2, 5) which interacts with a grinding-roller drive (6, 7) and the at least one trailed grinding assembly is formed by the grinding plate (1) which interacts with the brake unit (8).
  12. Vertical roller mill according to Claim 10, characterized in that the at least one driven grinding assembly is formed by the grinding plate (1) which interacts with a grinding-plate drive (11) and the at least one trailed grinding assembly is formed by at least one grinding roller (12) which interacts with the brake unit (10).
  13. Vertical roller mill according to Claim 10, characterized in that the brake unit (8, 10) is formed by a generator.
  14. Vertical roller mill according to Claim 10, characterized in that a regulator unit (9) for regulating slippage between the grinding plate and the at least one grinding roller (2, 5, 12) in a prespecified range is provided.
EP13701064.1A 2012-02-24 2013-01-22 Vertical roller mill and method for operating a vertical roller mill Not-in-force EP2817100B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012101489.2A DE102012101489B4 (en) 2012-02-24 2012-02-24 Vertical roller mill and method of operating a vertical roller mill
PCT/EP2013/051134 WO2013124106A2 (en) 2012-02-24 2013-01-22 Vertical roller mill and method for operating a vertical roller mill

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EP2817100A2 EP2817100A2 (en) 2014-12-31
EP2817100B1 true EP2817100B1 (en) 2016-03-30

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EP (1) EP2817100B1 (en)
JP (1) JP6196243B2 (en)
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DE (1) DE102012101489B4 (en)
DK (1) DK2817100T3 (en)
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DE102015203856A1 (en) 2015-03-04 2016-12-15 Thyssenkrupp Ag Vertical roller mill
US12109574B2 (en) 2020-02-14 2024-10-08 thyssenkrupp Polysius GmbH Roller mill with a synchronizing device
CN112452465A (en) * 2020-11-02 2021-03-09 中创科技孵化器泰州有限公司 Milling equipment is used in production and processing of firm type new material

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
GB1507010A (en) * 1976-07-27 1978-04-12 Smidth & Co As F L Roller mill
JPS58159854A (en) * 1982-03-16 1983-09-22 株式会社神戸製鋼所 Method and device for driving roller of vertical roller mill
JPS614548A (en) * 1984-06-16 1986-01-10 川崎重工業株式会社 Vertical type mill
DE19702854A1 (en) * 1997-01-27 1998-07-30 Krupp Polysius Ag Vertical axis mill for grinding mineral materials
CN101332442A (en) * 2007-06-28 2008-12-31 中信重工机械股份有限公司 Vertical roll grinder grinding roll voltage-applying mechanism
DE102007033256A1 (en) * 2007-07-17 2009-01-22 Polysius Ag roller mill
AU2008313822B2 (en) * 2007-10-16 2013-05-02 Flsmidth A/S Roller mill
JP5549180B2 (en) * 2009-10-26 2014-07-16 株式会社Ｉｈｉ Vertical mill
JP2011092818A (en) * 2009-10-27 2011-05-12 Ihi Corp Vertical mill
JP2011245372A (en) * 2010-05-24 2011-12-08 Mitsubishi Heavy Ind Ltd Vertical mill

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CN104220172A (en) 2014-12-17
US9643188B2 (en) 2017-05-09
JP2015508021A (en) 2015-03-16
CN104220172B (en) 2016-08-24
WO2013124106A2 (en) 2013-08-29
DE102012101489B4 (en) 2016-04-28
JP6196243B2 (en) 2017-09-13
DE102012101489A1 (en) 2013-08-29
DK2817100T3 (en) 2016-07-04
WO2013124106A3 (en) 2014-03-20
US20150014455A1 (en) 2015-01-15
EP2817100A2 (en) 2014-12-31

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