EP2780113B1 - Vertical roller mill - Google Patents
Vertical roller mill Download PDFInfo
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- EP2780113B1 EP2780113B1 EP13788897.0A EP13788897A EP2780113B1 EP 2780113 B1 EP2780113 B1 EP 2780113B1 EP 13788897 A EP13788897 A EP 13788897A EP 2780113 B1 EP2780113 B1 EP 2780113B1
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- Prior art keywords
- grinding
- roller mill
- mill according
- wind
- roller
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- 239000000463 material Substances 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims 2
- 238000000034 method Methods 0.000 description 6
- 239000011362 coarse particle Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Images
Classifications
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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
- B02C15/007—Mills with rollers pressed against a rotary horizontal disc
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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
- 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
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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
- 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
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
- B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
Definitions
- the invention relates to a vertical roller mill according to the preamble of claim 1.
- Vertical mills or vertical roller mills, are well known ( WO 2005/028112 A1 ; DE 31 00 341 A1 ). Said vertical mills have in the upper region of the mill housing a sifter basket rotating about a vertical axis for classifying the fines / gas mixture conveyed upwards in the gas stream.
- Another vertical mill which allows the separation and discharge of difficult-to-disperse constituents of a good mixture ( DE 197 18 668 C2 ), has in the upper part of the mill housing a horizontal seal, which rotates about a horizontal axis and in this way makes it possible to discharge fines from the grinding and visual process.
- the invention is therefore based on the object to design a vertical mill and in particular a vertical roller mill so that even with increasing vertical mills and higher throughputs in particular the classifier can be realized as a unit or with multiple units and a significant increase in energy consumption for the transport and drying gas is avoided.
- An essential core idea of the invention can be seen in considerably shortening the transit path from ground millbase particles to the sifter, so that no higher energy requirement is required with regard to the required pressure and gas volume.
- this is achieved by departing from a sifter basket arranged in the upper region of the mill housing by arranging smaller sifters, in particular horizontal sifters or slightly inclined sifters of this kind, in the vicinity of the rolls.
- Another essential idea of the invention can be seen to be to arrange a guide means for the ground material ground by the grinding roller for the upwardly conveyed in the gas stream finer Mahlgutpenien, the guide means enables a spiral-like supply line to the respective horizontal seal.
- the thus designed vertical roller mill with rotating grinding table and at least two rolling on the grinding bed stationary grinding rollers therefore provides by the smaller units of horizontal viewers or such smaller classifiers with inclined axis of rotation, which arranged in the vicinity of the rollers be a more efficient use of energy in terms of the required transport and drying gas or even an energy saving.
- the combination of the corresponding horizontal reflec- tor with an arcuate guide device for better supply of the millbase particles conveyed upward in the gas stream reduces or, if appropriate, avoids an internal recirculation of mill-ground millbase particles, so that an energy reduction can also be achieved as a result.
- each grinding roller is assigned in each case an air classifier or horizontal classifier and a guide device, so that recirculation flows can be largely avoided.
- the respective air classifier is arranged offset in front of the respective grinding roller.
- the displacement of the air classifier can therefore be directed to the guided through the center of the respective grinding roller vertical axis, as shown in FIG Fig. 1 is shown, this being done in the direction of the milled ground material, which is present behind the grinding roller.
- the arrangement of the respective air classifier offset from the corresponding grinding roller has the advantage that the grinding stock particles of the ground grinding material, which are present behind the grinding roller, can be better absorbed by the guiding device for the finer ground material transported upwards in the gas stream and directed to the associated horizontal leveler.
- the guide device is designed as a curved guide plate or as an arcuate collecting channel for spiraling the supply line to the sifter of the wind sifter.
- an arc-shaped collecting channel is provided for the upwardly transported regrind particles, the channel cross-section decreases in the direction of the air classifier, so that due to the increased flow velocity in this region and the centrifugal force acting there, a kind of priming for coarse grain takes place.
- These coarse particles are moved, in addition to the coarse particles rejected by the sifter of the sifter, onto a return device arranged below the sifter and returned to the grinding process.
- the return device is expediently designed as a funnel-shaped cone, whereby rejected coarse particles are preferably deposited on the return device inclined to the center, preferably approximately in the middle of the grinding plate.
- the arrangement of the air classifier or horizontal classifier can be constructively easily connected via a common inner, central discharge for the gas fine-material flow, so that a guide tube for passing the gas-fine material flow to downstream units such as cyclone or dust filter, sufficient.
- the respective air separators can be equipped with separate outlets for the classified gas-fine-material mixture to the outside.
- a separate workup of the Mahlgutpelle can be carried out in different, desired fractions.
- Such a designed vertical mill with horizontally or inclined arranged air classifiers which are each assigned in particular a grinding roller, therefore, allows shorter transport routes for the ground millbase particles.
- the grinding process and the energy required for this can be significantly improved with the solution according to the invention, especially since the total height of the vertical mill is smaller and lower, and also a recirculation of ground millbase particles is largely avoided.
- the horizontal or inclined air classifiers improve the classification of fine particles compared to static classifiers in the upper part of a vertical mill.
- Fig. 1 shows a partial section of a vertical mill in the range of a grinding table and thereon provided grinding rollers and in the vicinity of the rollers arranged horizontal viewers.
- the section shown corresponds approximately to a 90 ° cut, which may also include about 140 ° in view of the outer contours of the grinding rollers.
- a grinding roller is shown with view on the inside, while in the left area of the Fig. 1 a side view is shown on a second grinding roller with a schematic rocking lever arrangement in the region of Mahltellerrandes and the annular gap.
- Fig. 1 is a vertical roll mill 1 according to the invention schematically and shown in partial section.
- the detail section shows a vertical roller mill 1 in a circular segment-shaped section of about 90 ° between the vertical axes of two offset by about this angle, adjacent grinding rollers 4.
- the entire circle segment cut-out is therefore slightly larger and about 140 °.
- a grinding table 2 is shown with a direction of rotation D about its axis of rotation 3.
- two grinding rollers 4 are provided, wherein the lying in the plane of the drawing in the axis of rotation 3 grinding roller 4 is shown in the viewing direction from the inside out.
- the grinding roller 4 arranged in the left region or the left half of the roller mill 1 is shown in side view with a view of the conical roll shell and the suspension of the grinding roller via a rocking lever.
- annular gap 17 is provided, which normally has a blade ring and is intended for blowing in the transport and drying gas 19 as gas flow.
- the grinding material 13 to be comminuted and ground which can be centrally introduced, is fed to the grinding rollers 4 by the rotation D of the grinding plate 2 and comminuted by the pressure of the grinding roller and thus resulting shearing forces, so that behind the grinding roller 4 (on the left) a comminuted Grist is present.
- the newly introduced millbase 13 and the ground millbase 14 form a mixture in the real grinding process, which represent the grinding bed 15 in the outer region of the grinding plate 2.
- the stationary arranged grinding rollers 4 lead due to the force and frictional engagement with the grinding bed 15 in the same direction rotational movement D W with the grinding table 2 by.
- each grinding roller 4 in the vicinity of each grinding roller 4, above the same, slightly offset in the direction of rotation D of the grinding table 2, a smaller air classifier 7 with a horizontal axis 9, possibly also inclined axis to provide.
- the corresponding horizontal sifter 7 with a rotatably driven sifter basket 8 therefore receives in the gas flow 19 upwardly conveyed oversized regrind over a relatively short distance.
- a guide means 25 for example as a guide plate 26 or as a collecting channel 27, is provided.
- This guide means 25 can therefore be specifically collected and guided the ascending gas-particle flow, wherein an arcuate design in the direction and around the air classifier 7, the spiral inflow still improved. This also contributes to the decreasing cross-section of the guide channel 27.
- the supply of the rising gas-Mahlpumble-mixture 21 to the air classifier 7 is therefore carried out in the same rotational and rotational direction as the air classifier itself, so that the classifier basket 8 can be done a good classification in fines and rejected coarse grave.
- classifier 8 classified fines can then, as in the left part of Fig. 1 shown as fine material 29, in particular pneumatically, are directed to the outside and there in a central conveyor pipe or with decentralized individual lines subsequent units such as a cyclone or filter supplied.
- the air classifier 7 shown have a horizontal axis of rotation. Also possible is an inclined axis of rotation, wherein an inclination of the axis of rotation inwardly to the center of the grinding table favors the discharge of fines to the outside. On the other hand, an inclination of the axis of rotation of the air classifier 7 in the direction of the suspension and the oscillating lever of the corresponding grinding roller 4 favors the discharge of classified fines into the central, upper area of the roller mill, so that a central discharge for the fine material can be created.
- a funnel-shaped cone 31 is provided as a return device of the grass approximately in the central region of the grinding table 2.
- the construction according to the invention of the vertical roller mill with arrangement of air separators 7 in the vicinity of the grinding rollers 4 and in combination with the guide device 25 therefore permits a highly efficient grinding process, since recirculation of excess particles is largely prevented.
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Combined Means For Separation Of Solids (AREA)
Description
Die Erfindung betrifft eine vertikale Walzenmühle gemäß Oberbegriff des Anspruchs 1.The invention relates to a vertical roller mill according to the preamble of
Vertikalmühlen, beziehungsweise vertikale Walzenmühlen, sind hinreichend bekannt (
Da verfahrenstechnisch immer größere Durchsatzleistungen bei derartigen Vertikalmühlen gefordert werden, wird eine immer größer werdende Dimensionierung der Baugruppen wie Mahlteller, Mahlwalzen, Sichterkorb etc. durchgeführt. Die Baugruppen können daher teilweise nicht mehr als eine Einheit gefertigt werden, sondern aufgrund der Größe nur noch als unterteilte Einheiten, die am Einsatzort der Vertikalmühle erst zusammengebaut oder zusammengeschweißt werden müssen. Neben diesen Aspekten sind auch immer größer werdende Gasvolumen und entsprechende Gebläse erforderlich, um zum Beispiel Heißgas als Transport- und Trocknungsgas über den Ringspalt einzublasen und insbesondere die Aufwärtsförderung gemahlener Partikel zum Sichterkorb über die gesamte Höhe der Vertikalmühle realisieren zu können.Since procedurally larger and larger throughputs are required in such vertical mills, an ever-increasing dimensioning of the modules such as grinding plates, grinding rollers, sifter basket etc. is performed. The assemblies can therefore be partially made no more than one unit, but due to the size only as a subdivided units that need only be assembled or welded together at the site of the vertical mill. In addition to these aspects, ever increasing gas volume and corresponding blower are required to blow, for example, hot gas as transport and drying gas over the annular gap and in particular to be able to promote the upward conveyance of ground particles to the sifter basket over the entire height of the vertical mill.
Eine andere Vertikalmühle, die ein Trennen und Austragen von schwer dispergierbaren Bestandteilen eines Gutgemisches ermöglicht (
Der Einsatz von einem oder mehreren Horizontalsichtern in Vertikalmühlen darf daher als bekannt angenommen werden.The use of one or more horizontal viewers in vertical mills may therefore be assumed to be known.
Energetisch gesehen ist aber auch bei diesen Ausführungsformen das Problem vorhanden, größere Gasvolumina für den Transport der übermahlenen Mahlgutpartikel zur Verfügung zu stellen, um diese Partikel weitgehend über die gesamte Höhe des Gehäuses einer Vertikalmühle zu den im oberen Bereich vorgesehenen Horizontalsichtern leiten zu können.Energetically, however, in these embodiments, the problem exists to provide larger volumes of gas for the transport of the ground regrind particles to be able to conduct these particles largely over the entire height of the housing of a vertical mill to the horizontal viewers provided in the upper area.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vertikalmühle und insbesondere eine vertikale Walzenmühle so zu konzipieren, dass auch bei größer werdenden Vertikalmühlen und höheren Durchsatzleistungen insbesondere die Sichterbaugruppe als Einheit oder mit mehreren Einheiten realisiert werden kann und eine wesentliche Erhöhung des Energieaufwandes für das Transport- und Trocknungsgas vermieden wird.The invention is therefore based on the object to design a vertical mill and in particular a vertical roller mill so that even with increasing vertical mills and higher throughputs in particular the classifier can be realized as a unit or with multiple units and a significant increase in energy consumption for the transport and drying gas is avoided.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen beansprucht.This object is achieved by the features of
Ein wesentlicher Kerngedanke der Erfindung kann darin gesehen werden, den Transortweg von übermahlenen Mahlgutpartikeln zum Sichter erheblich zu verkürzen, so dass im Hinblick auf erforderlichen Druck und Gasvolumen kein höherer Energiebedarf erforderlich ist.An essential core idea of the invention can be seen in considerably shortening the transit path from ground millbase particles to the sifter, so that no higher energy requirement is required with regard to the required pressure and gas volume.
Dies wird einerseits durch das Abgehen von einem im oberen Bereich des Mühlengehäuses angeordneten Sichterkorb erreicht, indem im Nahbereich der Walzen kleinere Sichter, insbesondere Horizontalsichter oder leicht geneigte derartige Sichter, angeordnet werden.On the one hand, this is achieved by departing from a sifter basket arranged in the upper region of the mill housing by arranging smaller sifters, in particular horizontal sifters or slightly inclined sifters of this kind, in the vicinity of the rolls.
Ein weiterer essenzieller Gedanke der Erfindung kann darin gesehen werden, eine Führungseinrichtung für das von der Mahlwalze übermahlene Mahlgut für die im Gasstrom nach oben geförderten feineren Mahlgutpartikeln anzuordnen, wobei die Führungseinrichtung eine spiralartige Zuleitung zu dem jeweiligen Horizontalsichter ermöglicht.Another essential idea of the invention can be seen to be to arrange a guide means for the ground material ground by the grinding roller for the upwardly conveyed in the gas stream finer Mahlgutpartikeln, the guide means enables a spiral-like supply line to the respective horizontal seal.
Die derart ausgelegte vertikale Walzenmühle mit rotierendem Mahlteller und mindestens zwei auf dem Mahlbett abrollenden stationären Mahlwalzen schafft daher durch die kleineren Baueinheiten von Horizontalsichtern oder derartigen kleineren Sichtern mit geneigter Rotationsachse, wobei diese im Nahbereich der Walzen angeordnet werden, einen effizienteren Energieeinsatz im Hinblick auf das erforderliche Transport- und Trocknungsgas beziehungsweise sogar eine Energieeinsparung.The thus designed vertical roller mill with rotating grinding table and at least two rolling on the grinding bed stationary grinding rollers therefore provides by the smaller units of horizontal viewers or such smaller classifiers with inclined axis of rotation, which arranged in the vicinity of the rollers be a more efficient use of energy in terms of the required transport and drying gas or even an energy saving.
Die Kombination des entsprechenden Horizontalsichters mit einer bogenförmigen Führungseinrichtung zur besseren Zuleitung der im Gasstrom aufwärtsgeförderten Mahlgutpartikel reduziert beziehungsweise vermeidet gegebenenfalls eine innere Rezirkulation von übermahlenen Mahlgutpartikeln, so dass auch hierdurch eine Energiereduzierung erreichbar ist.The combination of the corresponding horizontal reflec- tor with an arcuate guide device for better supply of the millbase particles conveyed upward in the gas stream reduces or, if appropriate, avoids an internal recirculation of mill-ground millbase particles, so that an energy reduction can also be achieved as a result.
Zweckmäßigerweise wird jeder Mahlwalze jeweils ein Windsichter oder Horizontalsichter und eine Führungseinrichtung zugeordnet, so dass Rezirkulationsströmungen weitgehend vermieden werden können.Expediently, each grinding roller is assigned in each case an air classifier or horizontal classifier and a guide device, so that recirculation flows can be largely avoided.
Es ist jedoch auch denkbar und möglich, anstelle der Einzelzuordnung eines Horizontalsichters zu jeder Walze, auch eine Zusammenfassung der aufsteigenden Gas-Mahlgutpartikel-Strömung von zum Beispiel zwei Walzen zu realisieren. Bei einer Vier-Mahlwalzen-Mühle wäre daher auch die Realisierung mit zwei Horizontalsichtern denkbar, wobei jeweils ein Horizontalsichter einem zusammengefassten Paar von zwei Mahlwalzen zugeordnet ist.However, it is also conceivable and possible, instead of the individual assignment of a horizontal sight to each roller, to realize a summary of the rising gas-Mahlgutpartikel-flow of, for example, two rollers. In the case of a four-grinding roller mill, therefore, the realization with two horizontal sighting devices would also be conceivable, one horizontal seal being assigned to a combined pair of two grinding rollers.
Eine Verbesserung in strömungstechnischer Hinsicht wird auch dadurch erreicht, dass der jeweilige Windsichter versetzt vor der jeweiligen Mahlwalze angeordnet wird. Konstruktiv kann die Versetzung des Windsichters daher zu der durch das Zentrum der jeweiligen Mahlwalze geführten Vertikalachse, wie es in
Zur besseren Zuleitung der nach oben transportierten Mahlgutpartikel ist die Führungseinrichtung als bogenförmiges Führungsblech oder als ein bogenförmig verlaufender Auffangkanal zur spiralförmigen Zuleitung der Partikel zum Sichterkorb des Windsichters ausgelegt. Strömungsdynamisch entsteht dadurch über eine relativ kurze Strecke eine Zuführung der Mahlgutpartikel mit gleicher Drehrichtung wie der Sichterkorb des entsprechenden Windsichter es aufweist, so dass eine gute Klassierung der Mahlgutpartikel hierdurch erreicht werden kann.For better supply of the upwardly transported Mahlgutpartikel the guide device is designed as a curved guide plate or as an arcuate collecting channel for spiraling the supply line to the sifter of the wind sifter. As a result, flow dynamics produce a supply of the grinding material particles with the same direction of rotation over a relatively short distance Classifier basket of the corresponding air classifier has it, so that a good classification of Mahlgutpartikel thereby can be achieved.
Sofern ein bogenförmiger Auffangkanal für die nach oben transportierten Mahlgutpartikel vorgesehen ist, verkleinert sich der Kanalquerschnitt in Richtung zum Windsichter, so dass aufgrund erhöhter Strömungsgeschwindigkeit in diesem Bereich und der dort wirkenden Zentrifugalkraft eine Art Vorsichtung für Grobgriese erfolgt. Diese Grobgriese werden zusätzlich zu den vom Sichterkorb des Windsichters abgewiesenen Grobpartikeln auf eine unterhalb des Windsichters angeordnete Rückführeinrichtung bewegt, und erneut dem Mahlprozess zugeführt. Die Rückführeinrichtung ist zweckmäßigerweise als trichterförmiger Konus ausgebildet, wodurch abgewiesene Grobgriese auf der zum Zentrum geneigten Rückführeinrichtung bevorzugt etwa in der Mitte des Mahltellers wieder aufgegeben werden.If an arc-shaped collecting channel is provided for the upwardly transported regrind particles, the channel cross-section decreases in the direction of the air classifier, so that due to the increased flow velocity in this region and the centrifugal force acting there, a kind of priming for coarse grain takes place. These coarse particles are moved, in addition to the coarse particles rejected by the sifter of the sifter, onto a return device arranged below the sifter and returned to the grinding process. The return device is expediently designed as a funnel-shaped cone, whereby rejected coarse particles are preferably deposited on the return device inclined to the center, preferably approximately in the middle of the grinding plate.
Die Anordnung der Windsichter beziehungsweise Horizontalsichter kann konstruktiv einfach über eine gemeinsame innere, zentrale Ableitung für die Gas-Feingut-Strömung verbunden sein, so dass ein Führungsrohr zur Weiterleitung der Gas-Feingut-Strömung zu nachgeschalteten Aggregaten wie Zyklon oder Staubfilter, ausreicht.The arrangement of the air classifier or horizontal classifier can be constructively easily connected via a common inner, central discharge for the gas fine-material flow, so that a guide tube for passing the gas-fine material flow to downstream units such as cyclone or dust filter, sufficient.
Je nach Konzeption der gesamten Vertikalmühle können die jeweiligen Windsichter mit separaten Ableitungen nach außen für das klassierte Gas-Feingut-Gemisch ausgestattet sein. Mittels dieser Aufteilung kann auch eine separate Aufarbeitung der Mahlgutpartikel in unterschiedliche, gewünschte Fraktionen durchgeführt werden.Depending on the design of the entire vertical mill, the respective air separators can be equipped with separate outlets for the classified gas-fine-material mixture to the outside. By means of this division, a separate workup of the Mahlgutpartikel can be carried out in different, desired fractions.
Trotz der Integration mehrerer Wind- beziehungsweise Horizontalsichter kann bei dieser Auslegung der Vertikalmühle eine zentrale Mahlgutaufgabe realisiert werden, so dass ein erhöhter Kostenaufwand trotz mehrerer Windsichter nicht erforderlich erscheint.Despite the integration of several wind or horizontal sealers can be realized in this design of the vertical mill central Mahlgutaufgabe, so that an increased cost, despite several air classifier does not seem necessary.
Eine derart ausgelegte Vertikalmühle mit horizontal oder geneigt angeordneten Windsichtern, die insbesondere jeweils einer Mahlwalze zugeordnet sind, ermöglicht daher verkürzte Transportwege für die übermahlenen Mahlgutpartikel. Der Mahlprozess und der dafür erforderliche Energieaufwand kann mit der erfindungsgemäßen Lösung erheblich verbessert werden, zumal die Gesamthöhe der Vertikalmühle kleiner und niedriger wird und auch eine Rezirkulation übermahlener Mahlgutpartikel weitestgehend vermieden wird. Die horizontal oder geneigt eingesetzten Windsichter verbessern im Vergleich zu statischen Sichtern im oberen Bereich einer Vertikalmühle die Klassierung von Feingutpartikeln.Such a designed vertical mill with horizontally or inclined arranged air classifiers, which are each assigned in particular a grinding roller, therefore, allows shorter transport routes for the ground millbase particles. The grinding process and the energy required for this can be significantly improved with the solution according to the invention, especially since the total height of the vertical mill is smaller and lower, and also a recirculation of ground millbase particles is largely avoided. The horizontal or inclined air classifiers improve the classification of fine particles compared to static classifiers in the upper part of a vertical mill.
Aufgrund der verkürzten Transportwege für übermahlene Mahlgutpartikel nach oben, kann auch im Falle eines Schaufelkranzes innerhalb des Ringspaltes um den Mahlteller, das Gasvolumen und der erforderliche Druck verringert werden, so dass energetische Einsparungen erreicht werden.Due to the shortened transport paths for oversized Mahlgutpartikel upwards, even in the case of a blade ring within the annular gap around the grinding table, the gas volume and the required pressure can be reduced, so that energy savings can be achieved.
Die Erfindung wird nachfolgend anhand eines schematischen Ausführungsbeispiels noch näher erläutert.The invention will be explained in more detail with reference to a schematic embodiment.
Die einzige
In der
Der Detailschnitt zeigt eine vertikale Walzenmühle 1 in einem kreissegmentförmigen Ausschnitt von etwa 90° zwischen den Vertikalachsen zweier etwa um diesen Winkel versetzten, benachbarten Mahlwalzen 4. Der gesamte Kreissegment-Ausschnitt ist daher etwas größer und etwa 140°.The detail section shows a
Im unteren Bereich ist ein Mahlteller 2 mit einer Drehrichtung D um seine Rotationsachse 3 dargestellt. Auf dem Mahlteller 2 sind zwei Mahlwalzen 4 vorgesehen, wobei die in der Zeichnungsebene in der Rotationsachse 3 liegende Mahlwalze 4 in Sichtrichtung von innen nach außen dargestellt ist. Die im linken Bereich beziehungsweise der linken Hälfte der Walzenmühle 1 angeordnete Mahlwalze 4 ist in Seitenansicht dargestellt mit Blick auf den konusförmigen Walzenmantel und der Aufhängung der Mahlwalze über einen Schwinghebel.In the lower area, a grinding table 2 is shown with a direction of rotation D about its axis of
Umlaufend um den radial äußeren Rand des Mahltellers 2 ist ein Ringspalt 17 vorgesehen, der normalerweise einen Schaufelkranz aufweist und zum Einblasen des Transport- und Trocknungsgases 19 als Gasströmung bestimmt ist.Around the radially outer edge of the grinding table 2, an
Das zu zerkleinernde und zu mahlende Mahlgut 13, welches zentral eingebracht werden kann, wird durch die Drehung D des Mahltellers 2 den Mahlwalzen 4 zugeführt und durch den Druck der Mahlwalze und dadurch entstehende Scherkräfte zerkleinert, so dass hinter der Mahlwalze 4 (links) ein übermahlenes Mahlgut vorhanden ist.The grinding
Das neu eingebrachte Mahlgut 13 und das übermahlene Mahlgut 14 bilden im realen Mahlprozess eine Mischung, die das Mahlbett 15 im äußeren Bereich des Mahltellers 2 darstellen.The newly introduced
Um ein mehrmaliges Überrollen beziehungsweise Übermahlen von zerkleinertem Mahlgut zu vermeiden, wird prozessmäßig vorgesehen, durch die eingeblasene Gasströmung 19 einen möglichst großen Volumenanteil von Feingut und Mahlgutpartikeln in dem aufsteigenden Gas-Mahlpartikel-Gemisch 21 hinter der jeweiligen Mahlwalze 4 sofort dem entsprechenden Windsichter 7 zuzuführen.In order to avoid a repeated overrunning or oversize of comminuted material to be ground, it is provided by process, to feed the largest possible volume fraction of fines and Mahlgutpartikeln in the rising gas-Mahlpartikel-
Die stationär angeordneten Mahlwalzen 4 führen aufgrund des Kraft- und Reibschlusses mit dem Mahlbett 15 eine gleichsinnige Drehbewegung DW mit dem Mahlteller 2 durch.The stationary arranged
Gemäß der Erfindung ist vorgesehen, im Nahbereich jeder Mahlwalze 4, oberhalb derselben, etwas in Drehrichtung D des Mahltellers 2 versetzt, einen kleineren Windsichter 7 mit horizontaler Achse 9, gegebenenfalls auch geneigter Achse, vorzusehen. Der entsprechende Horizontalsichter 7 mit einem rotativ angetriebenen Sichterkorb 8 erhält daher das im Gasstrom 19 nach oben geförderte übermahlene Mahlgut über eine relativ kurze Strecke.According to the invention it is provided, in the vicinity of each
Es bedarf daher keiner druck- und volumenmäßig hohen Gasströmung 19, um das Gas-Mahlpartikel-Gemisch über den gesamten Mahlraum der Vertikalmühle bis zu einem im oberen Bereich des Gehäuses der Mühle angeordneten Sichterkorb zu transportieren.It therefore requires no high pressure and volume
Erfindungsgemäß wird neben der Streckenverkürzung durch die Anordnung des Windsichters 7 im Nahbereich der Mahlwalze 4, zusätzlich eine Führungseinrichtung 25, zum Beispiel als Leitblech 26 oder als Auffangkanal 27, vorgesehen. Durch diese Führungseinrichtung 25 kann daher die aufsteigende Gas-Partikel-Strömung gezielt aufgefangen und geführt werden, wobei eine bogenförmige Gestaltung in Richtung und um den Windsichter 7 die spiralförmige Zuströmung noch verbessert. Hierzu trägt auch der kleiner werdende Querschnitt des Führungskanales 27 bei. Die Zuführung des aufsteigenden Gas-Mahlpartikel-Gemisches 21 zum Windsichter 7 erfolgt daher in gleicher Rotations- und Drehrichtung wie der Windsichter selbst, so dass am Sichterkorb 8 eine gute Klassierung in Feingut und abgewiesene Grobgriese erfolgen kann.According to the invention, in addition to the shortening of the distance by the arrangement of the air classifier 7 in the vicinity of the
Im Sichterkorb 8 klassiertes Feingut kann dann, wie im linken Teil der
Die dargestellten Windsichter 7 weisen eine horizontale Rotationsachse auf. Möglich ist auch eine geneigte Rotationsachse, wobei eine Neigung der Rotationsachse nach innen zum Zentrum des Mahltellers das Ableiten von Feingut nach außen begünstigt. Eine Neigung der Rotationsachse des Windsichters 7 in Richtung der Aufhängung und des Schwinghebels der entsprechenden Mahlwalze 4 begünstigt hingegen die Abgabe von klassiertem Feingut in den mittigen, oberen Bereich der Walzenmühle, so dass eine zentrale Ableitung für das Feingut geschaffen werden kann.The air classifier 7 shown have a horizontal axis of rotation. Also possible is an inclined axis of rotation, wherein an inclination of the axis of rotation inwardly to the center of the grinding table favors the discharge of fines to the outside. On the other hand, an inclination of the axis of rotation of the air classifier 7 in the direction of the suspension and the oscillating lever of the
Für die Rückführung abgewiesener Grobgriese 32 ist ein trichterförmiger Konus 31 als Rückführeinrichtung der Griese etwa in den mittleren Bereich des Mahltellers 2 vorgesehen.For the repatriation rejected Grobgriese 32 a funnel-
Der erfindungsgemäße Aufbau der vertikalen Walzenmühle mit Anordnung von Windsichtern 7 im Nahbereich zu den Mahlwalzen 4 und in Kombination mit der Führungseinrichtung 25 erlaubt daher einen hocheffizienten Mahlprozess, da eine Rezirkulation von übermahlenen Partikeln weitgehend verhindert wird. Hinzu treten ein geringeres Transportgasvolumen und ein geringer Gasdruck aufgrund der kurzen Wegstrecke zwischen Mahlbett und vorhandenen Windsichtern 7. Ebenso ist aufgrund der niedrigeren Bauweise dieser vertikalen Walzenmühle im Vergleich zu herkömmlichen Vertikalmühlen ein geringeres Investitionsvolumen für die Gesamtanlage einer erfindungsgemäßen Walzenmühle erforderlich.The construction according to the invention of the vertical roller mill with arrangement of air separators 7 in the vicinity of the
Claims (12)
- Vertical roller mill (1), having
a driven grinding table (2) and at least two stationary grinding rollers (4) rolling on the grinding bed (15) of the grinding material (13),
an annular gap (17) surrounding the grinding table (2) for blown-in gas (19) for transporting and / or drying grinding material particles (21) of the over-ground grinding material,
at least one wind classifier (7) which classifies grinding material particles (14) upwardly conveyed in the gas flow (19) into fines (29) and recirculated coarse material (32), wherein the wind classifier (7) is arranged essentially with horizontal (9) or inclined classifier axis,
characterised in that
a plurality of wind classifiers (7) is provided, wherein the plurality of classifiers (7) is located in the vicinity above the grinding rollers (4), and
at least one guide unit (25), for feeding grinding material particles (14) in a spiral manner upwardly conveyed in the gas flow (21) to the wind classifier (7), is assigned to each grinding roller (4). - Roller mill according to claim 1,
characterised in that
a wind classifier (7) and a guide unit (25) are respectively assigned to each grinding roller (4). - Roller mill according to claim 1 or 2,
characterised in that
the respective wind classifier (7) is provided offset with respect to the vertical axis (3) through the centre (5) of the respective grinding roller (4) in the direction of the over-ground grinding material (14). - Roller mill according to one of claims 1 to 3,
characterised in that
the guide unit (25) has a curved guide plate (26) or a curved collecting channel (27) for spiral feeding of grinding material particles (14) to the classifier basket (8) of the wind classifier (7). - Roller mill according to claim 4,
characterised in that
the curved collecting channel (27) is formed with channel cross-section reducing towards or around the wind classifier (7). - Roller mill according to one of the claims 1 to 5,
characterised in that
the guide unit (25) has, approximately at the height of the upper region of the grinding rollers (4), an inflow region of the collecting channel (27) for grinding material particles (14, 19) and is provided in the rear region of the respective grinding roller (4). - Roller mill according to one of the claims 1 to 6,
characterised in that
the flow direction of the grinding material particles (14, 19) corresponds in the region of the guide unit (25) to the rotation direction of the wind classifiers (7). - Roller mill according to one of the claims 1 to 7,
characterised in that
each wind classifier (7) has a recirculating unit (31), inclined towards the centre (3) of the grinding table (2), for rejected coarse material (32). - Roller mill according to claim 8,
characterised in that
the recirculating unit (31) is formed as a funnel-shaped cone. - Roller mill according to one of the claims 1 to 9,
characterised in that
the wind classifiers (7) are connected to an inner central discharge line for the classified gas - fines mixture (29) leaving the wind classifiers (7). - Roller mill according to one of the claims 1 to 9,
characterised in that
the wind classifiers (7) have separate discharge lines outwards for the classified gas - fines mixture (29). - Roller mill according to one of the claims 1 to 11,
characterised in that
a central grinding material feed is provided.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2013/067206 WO2014067688A1 (en) | 2013-08-19 | 2013-08-19 | Vertical roller mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2780113A1 EP2780113A1 (en) | 2014-09-24 |
| EP2780113B1 true EP2780113B1 (en) | 2016-01-06 |
Family
ID=49553650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13788897.0A Active EP2780113B1 (en) | 2013-08-19 | 2013-08-19 | Vertical roller mill |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2780113B1 (en) |
| JP (1) | JP2016528038A (en) |
| CN (1) | CN104540591A (en) |
| DK (1) | DK2780113T3 (en) |
| WO (1) | WO2014067688A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107225025A (en) * | 2017-08-08 | 2017-10-03 | 江苏鹏飞集团股份有限公司 | The vertical pulverizer of Bidirectional discharging |
| CN109821643A (en) * | 2017-11-23 | 2019-05-31 | 合肥中亚建材装备有限责任公司 | A kind of vertical grind materials stop gauge |
| CN108722626B (en) * | 2018-04-26 | 2020-04-10 | 凤冈县富源茯苓有限责任公司 | Equipment for producing poria cocos noodles |
| CN111712326B (en) * | 2019-01-17 | 2023-02-03 | 德国莱歇公司 | Rolling rod module |
| CN112827579B (en) * | 2021-02-05 | 2023-12-12 | 南京西普国际工程有限公司 | Screening lifting device in mill and vertical roller mill |
| CN113304829B (en) * | 2021-06-09 | 2022-08-19 | 哈尔滨商业大学 | Device for separating coarse powder and fine powder after crushing traditional Chinese medicine components |
| CN118475410A (en) | 2022-01-04 | 2024-08-09 | 勒舍有限公司 | Screen device for vertical roller mill |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3100341A1 (en) | 1981-01-08 | 1982-07-22 | Loesche GmbH, 4000 Düsseldorf | ROLL MILL, ESPECIALLY FOR COAL GRINDING |
| DE19718668C2 (en) | 1997-05-02 | 2003-04-03 | Hosokawa Alpine Ag & Co | Process for separating and continuously removing difficult-to-disperse components |
| DE10221739A1 (en) * | 2002-05-16 | 2003-12-04 | Kloeckner Humboldt Wedag | Circular grinding plant with mill and sifter |
| EP1675683B1 (en) | 2003-09-12 | 2011-03-02 | Loesche GmbH | Method of operating of roller grinding mill, and method for the production of cement |
-
2013
- 2013-08-19 CN CN201380006355.5A patent/CN104540591A/en active Pending
- 2013-08-19 WO PCT/EP2013/067206 patent/WO2014067688A1/en active Application Filing
- 2013-08-19 EP EP13788897.0A patent/EP2780113B1/en active Active
- 2013-08-19 JP JP2016535348A patent/JP2016528038A/en active Pending
- 2013-08-19 DK DK13788897.0T patent/DK2780113T3/en active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014067688A1 (en) | 2014-05-08 |
| CN104540591A (en) | 2015-04-22 |
| DK2780113T3 (en) | 2016-04-11 |
| EP2780113A1 (en) | 2014-09-24 |
| JP2016528038A (en) | 2016-09-15 |
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