EP3265233B1 - Vertical roll mill - Google Patents

Vertical roll mill Download PDF

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Publication number
EP3265233B1
EP3265233B1 EP16706191.0A EP16706191A EP3265233B1 EP 3265233 B1 EP3265233 B1 EP 3265233B1 EP 16706191 A EP16706191 A EP 16706191A EP 3265233 B1 EP3265233 B1 EP 3265233B1
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EP
European Patent Office
Prior art keywords
roll mill
bypass
vertical roll
nozzle ring
cross
Prior art date
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Active
Application number
EP16706191.0A
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German (de)
French (fr)
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EP3265233A1 (en
Inventor
Björn Olaf ASSMANN
Carsten Sachse
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ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
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ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
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Publication of EP3265233A1 publication Critical patent/EP3265233A1/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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface
    • 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
    • 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
    • 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
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
    • B03C1/20—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation in the form of belts, e.g. cross-belt type
    • 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 with a bypass device for discharging difficult to grind particles, such as ductile particles, such as iron, from the grinding process.
  • An average slag sand or blast furnace slag contains an iron content between 0.3% to 0.5% by weight.
  • the iron can be discharged from the mill in two ways.
  • One variant is the discharge of the iron via the product stream.
  • the iron must be transported pneumatically to the classifier and then pass through the classifier rotor in order to mix with the ground product To leave mill.
  • the high density of the iron in relation to the blastfurnace slag and the small particle size of the product argue against discharging the iron with the product stream.
  • the pneumatic transport to the classifier is made more difficult and in the classifier, the iron on the rotor is preferably rejected because of its higher density, so that it is fed again as a meal to the plate. Due to the ductility of the iron particles hardly any comminution takes place, so that the fine iron circulates in the mill and accumulates.
  • the iron particles fall through the nozzle ring and are then removed from the material flow in the external material circuit by a magnetic separator.
  • the second Austragsdorfkeit on the nozzle ring is limited only to the coarse iron particles, because the finer iron particles are transported back to the plate due to the high speed in the nozzle ring.
  • the coarse iron particles fall through the nozzle ring and are transported by means of Austragsianan in the external circuit.
  • a reduction of the speed in the nozzle ring for the discharge of fine iron particles is not effective, since this u.a. negatively affects the load capacity of the mill.
  • a constructive enlargement of the nozzle ring surface degrades the operation, since the transmitted pulse for accelerating the product particles in the direction of the classifier is insufficient.
  • the grinding process is adversely affected.
  • the accumulated fine iron is therefore too coarse for the product and too fine for the cross flow classification at the nozzle ring.
  • the accumulation of fine iron has a negative effect on the wear of the grinding tools, the mill housing and the classifier.
  • the fine iron circulating in the mill causes an increase in energy demand, combined with a decrease in throughput.
  • the fine iron above a certain concentration in the grinding circuit leads to higher vibrations in mill operation.
  • the object of the invention is to provide a vertical roller mill, which significantly reduces iron accumulation on the grinding table.
  • the vertical roller mill has a grinding table, at least one grinding roller, a nozzle ring, an air supply device and at least one discharge element.
  • the nozzle ring surrounds the grinding table horizontally, which means that the nozzle ring is arranged annularly in the same plane around the grinding table.
  • the air supply device is arranged below the nozzle ring and below the air supply device, the at least one discharge element is arranged.
  • the vertical roller mill has at least one bypass device, wherein the at least one bypass device forms a connection between the nozzle ring and the at least one discharge element.
  • the at least one bypass device has no direct contact with the walls of the discharge element, since the discharge element rotates with the grinding plate and the bypass device can be statically fixed.
  • a flow-calming area is generated at the location of the bypass device in the nozzle ring.
  • virtually any material regardless of size and specific gravity, can be discharged through the at least one bypass device.
  • iron is discharged regardless of the particle size of the grinding table, an enrichment can be avoided.
  • the bypass device can be designed, for example, tubular with, for example, a round, oval, or angular cross-section. Particularly preferred is the round cross-section.
  • the at least one bypass device in the region of the air supply device has a gas-impermeable outer skin.
  • the gas-impermeable outer skin is a metal wall, a plastic wall or a Composite wall, in particular a glass fiber composite wall or a carbon fiber composite wall.
  • the outer skin for the comparatively strong gas flow in the air supply device is impermeable and thus generates no significant flow in the region of the nozzle ring. Questions of gas diffusion are therefore irrelevant in the context of this invention.
  • the number of bypass devices corresponds to the number of grinding rollers.
  • the number of bypass devices corresponds to an integer multiple of the number of grinding rollers.
  • the vertical roller mill has two to six milling rollers and two to six bypass devices.
  • the vertical roller mill has at least two bypass devices.
  • the at least two bypass devices are arranged equidistantly. Two bypass devices are found to be 180 ° apart on the nozzle ring, 120 ° for three bypass devices, and 90 ° for four bypass devices. If the vertical roller mill has an integer multiple of bypass devices compared to the number of grinding rollers, then groups of bypass devices corresponding to a number corresponding to the integer multiple may be arranged equidistant from each other.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 2.5% of the surface of the grinding table.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 1.0% of the surface of the grinding table.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 0.5% of the surface of the grinding table.
  • the at least one bypass device affects the operation and thus the efficiency of the nozzle ring.
  • product is also carried by the at least one bypass device. Therefore, an excessively high bypass rate, which would result from an excessively large cross-sectional area of the at least one bypass device, does not make sense.
  • the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is at least 0.01% of the surface of the grinding table.
  • all the bypass devices together have a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of all the bypass devices together is less than 2.5% of the surface of the grinding table.
  • the sum of all cross-sectional areas of all bypass devices on the surface of the nozzle ring is less than 10% of the surface of the nozzle ring.
  • the sum of all cross-sectional areas of all bypass devices on the surface of the nozzle ring is less than 5% of the surface of the nozzle ring.
  • the bypass device has a largest cross section of less than 250 mm.
  • the largest cross-section is for example at a round cross-section of the diameter to understand in a rectangular cross-section the diagonal between opposite corners.
  • the largest cross-section thus represents the largest dimension that the cross section of a particle in the same plane can have, so that the particle can pass through the bypass device.
  • the bypass device has a largest cross section of less than 200 mm.
  • the bypass device has a largest cross section of less than 100 mm.
  • the bypass device has a largest cross section of at least 20 mm.
  • the bypass device has a largest cross section of at least 40 mm.
  • a separator is arranged behind the discharge element.
  • the separator is a magnetic separator, more preferably, the magnetic separator is selected from the group comprising Trommelmagnetabscheider and Matterbandmagnetabscheider.
  • a material return to the grinding table is arranged behind the separator.
  • the iron can be removed by the separator.
  • the other components regularly contain the educt or the product, so that they are advantageously fed back to the grinding table.
  • the bypass device has a larger cross-sectional area at the upper end on the nozzle ring than at the lower end on the discharge element.
  • the bypass device is designed conical. This has the advantage that due to the smaller diameter at the lower end less air can pass from the air supply device via the discharge element in the bypass device and thus the flow area above the bypass device can be calmed particularly efficient.
  • the bypass device is arranged within a below average flowed through area of the air supply device. This arrangement also results in less air being able to pass from the air supply device via the discharge element into the bypass device, and thus the flow region above the bypass device can be calmed particularly efficiently.
  • the bypass device is located in an area with sufficient material discharge from the grinding table. Sufficient is understood in this context, an area with locally above average material disposal.
  • the applicator element has a closure flap and the bypass device has a maximum distance of 950 mm from the lower edge of the dispensing element. Due to the comparatively small distance, less air can pass from the air supply device via the discharge element into the bypass device, and thus the flow region above the bypass device can be calmed particularly efficiently.
  • the applicator elements have a closure flap and the bypass device has a maximum distance of 750 mm from the lower edge of the dispensing element.
  • the applicator elements have a closure flap and the bypass device has a maximum distance of 550 mm from the lower edge of the dispensing element.
  • the vertical roller mill on an axis of symmetry, particularly preferably a threefold axis of rotation (C 3 after Schönflies), a selfish axis of rotation (C 4 after Schönflies) or a sechraw axis of rotation (C 6 after Schönflies) on.
  • FIG. 1 is shown a schematic cross section of the vertical roller mill 10 and in FIG. 2 a schematic plan view of the plane of the grinding table 20.
  • the grinding table 20 has recordable, a diameter of about 4.5 m, the nozzle ring 40 has a width of about 40 cm.
  • Above the grinding table 20 are in this exemplary vertical roller mill 10 three grinding rollers 30, of which only one in FIG. 1 you can see.
  • Below the nozzle ring 40 is the air supply device 50, in which three air inlets (in FIG. 2 air) which rises through the nozzle ring 40 and discharges the milled product from the vertical roller mill 10.
  • a discharge element 60 is arranged, in which the material falling through the nozzle ring 40 is collected.
  • the vertical roller mill 10 has an air outlet 105. This structure corresponds in this respect to a vertical roller mill according to the prior art.
  • the inventive vertical roller mill 10 additionally has, in the example shown, three bypass devices 70 which lead from the nozzle ring 40 into the discharge element 60. Since that Austragelement 60 is designed in the form of a depression below the air supply means 50, this area is flow-reduced, whereby only a small amount of air from the air inlet 55 through the air supply means 50, the discharge element 60 and the bypass devices 70 is passed. As a result, the flow above the bypass devices 70 is greatly reduced and so even small and thus comparatively light iron particles can be discharged through the bypass devices 70.
  • bypass devices 70 are oriented with a maximum fluidic distance from the three air inlets 55. This additionally reduces the air flowing through the bypass devices 70.
  • FIG. 3 a bypass device 70 is shown, wherein the bypass device 70 in the upper region with additional material baffles 75 which increase the material input into the bypass device 70 in the region of the nozzle ring 40.
  • FIG. 3a is to recognize the funnel function of the Materialleitblechs 75 in cross section, in FIG. 3b In the top view, the ratio between the diameter of the bypass device 70 and the Materialleitblechs well visible.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Description

Die Erfindung betrifft eine Vertikal-Rollenmühle mit einer Bypass-Vorrichtung zum Austrag von schwer mahlbaren Partikeln, beispielsweise duktilen Partikeln, wie zum Beispiel Eisen, aus dem Mahlprozess.The invention relates to a vertical roller mill with a bypass device for discharging difficult to grind particles, such as ductile particles, such as iron, from the grinding process.

In der Zementmahlung wird der Zementklinker zunehmend durch weitere Bestandteile, wie zum Beispiel Kalkstein, Hüttensand oder Flugasche, ersetzt. Dies hat zur Folge, dass die Klinkerkomponente bei abnehmendem Anteil tendenziell feiner aufgemahlen werden muss, um die Produktqualität insbesondere die Zementfestigkeiten zu gewährleisten. Es ist zu erwarten, dass sich der Trend aus ökonomischen und ökologischen Gründen in der Zukunft fortsetzt. Eine moderne Vertikal-Rollenmühle muss daher diese unterschiedlichen Aufgabematerialien bei einem gleichzeitig diversifizierten Produktportfolio (individuelle Kundenwünsche) verarbeiten können, um die Bedürfnisse des Marktes zu erfüllen. Dies führt jedoch dazu, dass eine Vertikal-Rollenmühle nicht auf den Betrieb mit einem bestimmten Aufgabegut optimiert werden kann, sondern möglichst eine Reihe unterschiedlicher Aufgabegüter zusammen oder getrennt in der Mühle vermahlen werden müssen. Die Zementmahlanlage sollte dabei schnell und flexibel (ohne mechanische Änderungen) zwischen verschiedenen Mahlprodukten umgestellt werden können. Somit müssen geeignete Prozess- und Betriebsparameter gefunden werden, die einen energieeffizienten und durchsatzoptimierten Mahlbetrieb für alle Mahlgüter ermöglichen.In cement grinding, the cement clinker is increasingly being replaced by other ingredients, such as limestone, blastfurnace slag or fly ash. This has the consequence that the clinker component tends to be finely ground with decreasing proportion in order to ensure the product quality, in particular the cement strengths. It is to be expected that the trend will continue in the future for economic and ecological reasons. A modern vertical roller mill must therefore be able to process these different input materials with a simultaneously diversified product portfolio (individual customer requirements) in order to meet the needs of the market. However, this means that a vertical roller mill can not be optimized for operation with a certain feedstock, but as far as possible a number of different feed materials must be milled together or separately in the mill. The cement grinding plant was to be able to switch quickly and flexibly (without mechanical changes) between different grinding products. Thus, suitable process and operating parameters must be found that enable an energy-efficient and throughput-optimized grinding operation for all regrinds.

Bei der Vermahlung von Hüttensand kommt es zudem noch zu einer Anreicherung von magnetischem Feineisen auf dem Mahlteller. Hierbei kann allein eine Anpassung der Betriebsparameter nicht die Anreicherung von Feineisen auf dem Mahlteller bzw. auf der Mahlbahn bei der Vermahlung von Hüttensand bzw. Hochofenschlacke verhindern. Ein durchschnittlicher Hüttensand bzw. Hochofenschlacke enthält einen Eisenanteil zwischen 0,3 % bis 0,5 % Massenanteil.During the grinding of blastfurnace slag there is also an accumulation of magnetic fine iron on the grinding table. Here alone an adaptation of the operating parameters can not prevent the accumulation of fine iron on the grinding table or on the grinding path in the grinding of granulated slag or blast furnace slag. An average slag sand or blast furnace slag contains an iron content between 0.3% to 0.5% by weight.

Prinzipiell kann das Eisen auf zwei Wegen aus der Mühle ausgetragen werden. Eine Variante ist der Austrag des Eisens über den Produktstrom. Dabei muss das Eisen pneumatisch zum Sichter transportiert werden und anschließend den Sichterrotor passieren, um mit dem Mahlprodukt die Mühle zu verlassen. Gegen einen Austrag des Eisens mit dem Produktstrom sprechen die hohe Dichte des Eisens im Verhältnis zum Hüttensand und die geringe Partikelgröße des Produktes. Damit wird der pneumatische Transport zum Sichter erschwert und im Sichter wird das Eisen am Rotor wegen seiner höheren Dichte bevorzugt abgewiesen, so dass es als Grieße erneut dem Teller zugeführt wird. Aufgrund der Duktilität der Eisenpartikel findet kaum eine Zerkleinerung statt, so dass das Feineisen in der Mühle zirkuliert und sich anreichert.In principle, the iron can be discharged from the mill in two ways. One variant is the discharge of the iron via the product stream. In this case, the iron must be transported pneumatically to the classifier and then pass through the classifier rotor in order to mix with the ground product To leave mill. The high density of the iron in relation to the blastfurnace slag and the small particle size of the product argue against discharging the iron with the product stream. Thus, the pneumatic transport to the classifier is made more difficult and in the classifier, the iron on the rotor is preferably rejected because of its higher density, so that it is fed again as a meal to the plate. Due to the ductility of the iron particles hardly any comminution takes place, so that the fine iron circulates in the mill and accumulates.

In der zweiten Variante fallen die Eisenpartikel durch den Düsenring und werden danach im externen Materialkreislauf durch einen Magnetabscheider dem Materialstrom entzogen. Die zweite Austragsmöglichkeit über den Düsenring beschränkt sich jedoch nur auf die groben Eisenpartikel, da die feineren Eisenpartikel aufgrund der hohen Geschwindigkeit im Düsenring wieder zurück zum Teller befördert werden. Die groben Eisenpartikel fallen hingegen durch den Düsenring und werden mit Hilfe von Austragselementen in den externen Kreislauf befördert. Eine Absenkung der Geschwindigkeit im Düsenring zur Ausschleusung von feinen Eisenpartikeln ist nicht zielführend, da sich dies u.a. negativ auf die Tragfähigkeit innerhalb der Mühle auswirkt. Eine konstruktive Vergrößerung der Düsenringfläche (Absenkung der Geschwindigkeit im Düsenring) verschlechtert wiederum den Betrieb, da der übertragene Impuls zur Beschleunigung der Produktpartikel in Richtung Sichter unzureichend ist. Insbesondere bei einem Swing-Betrieb, zum Beispiel bei der Mahlung von Zementklinker mit der gleichen Mahlanlage, wird der Mahlprozess negativ beeinflusst.In the second variant, the iron particles fall through the nozzle ring and are then removed from the material flow in the external material circuit by a magnetic separator. However, the second Austragsmöglichkeit on the nozzle ring is limited only to the coarse iron particles, because the finer iron particles are transported back to the plate due to the high speed in the nozzle ring. The coarse iron particles, however, fall through the nozzle ring and are transported by means of Austragselementen in the external circuit. A reduction of the speed in the nozzle ring for the discharge of fine iron particles is not effective, since this u.a. negatively affects the load capacity of the mill. A constructive enlargement of the nozzle ring surface (reduction of the speed in the nozzle ring) in turn degrades the operation, since the transmitted pulse for accelerating the product particles in the direction of the classifier is insufficient. In particular, in a swing operation, for example, in the grinding of cement clinker with the same grinding plant, the grinding process is adversely affected.

Das akkumulierte Feineisen ist demnach zu grob für das Produkt und zu fein für die Querstromklassierung am Düsenring. Die Anreicherung des Feineisens wirkt sich negativ auf den Verschleiß der Mahlwerkzeuge, des Mühlengehäuses und des Sichters aus. Zusätzlich verursacht das in der Mühle zirkulierende Feineisen einen Anstieg des Energiebedarfs verbunden mit einem Rückgang der Durchsatzleistung. Außerdem führt das Feineisen ab einer gewissen Konzentration im Mahlkreislauf zu höheren Vibrationen im Mühlenbetrieb.The accumulated fine iron is therefore too coarse for the product and too fine for the cross flow classification at the nozzle ring. The accumulation of fine iron has a negative effect on the wear of the grinding tools, the mill housing and the classifier. In addition, the fine iron circulating in the mill causes an increase in energy demand, combined with a decrease in throughput. In addition, the fine iron above a certain concentration in the grinding circuit leads to higher vibrations in mill operation.

Eine weitere derartige Rollenmühle ist aus der JPH06210193 bekannt.Another such roller mill is known from JPH06210193.

Aufgabe der Erfindung ist es, eine Vertikal-Rollenmühle zu schaffen, welche eine Eisenanreicherung auf dem Mahlteller deutlich reduziert.The object of the invention is to provide a vertical roller mill, which significantly reduces iron accumulation on the grinding table.

Gelöst wird die Aufgabe durch eine Vertikal-Rollenmühle mit den in Anspruch 1 angegebenen Merkmalen. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen, der nachfolgenden Beschreibung sowie den Zeichnungen.The object is achieved by a vertical roller mill with the features specified in claim 1. Advantageous developments emerge from the subclaims, the following description and the drawings.

Die erfindungsgemäße Vertikal-Rollenmühle weist einen Mahlteller, wenigstens eine Mahlrolle, einen Düsenring, eine Luftzufuhrvorrichtung und wenigstens ein Austragselement auf. Der Düsenring umgibt den Mahlteller horizontal, was bedeutet, dass der Düsenring ringförmig in der gleichen Ebene um den Mahlteller angeordnet ist. Die Luftzufuhreinrichtung ist unterhalb des Düsenrings angeordnet und unterhalb der Luftzufuhreinrichtung ist das wenigstens eine Austragselement angeordnet. Erfindungsgemäß weist die Vertikal-Rollenmühle wenigstens eine Bypass-Vorrichtung auf, wobei die wenigstens eine Bypass-Vorrichtung eine Verbindung zwischen dem Düsenring und dem wenigstens einen Austragselement bildet. Vorzugsweise weist die wenigstens eine Bypass-Vorrichtung keinen direkten Kontakt zu den Wandungen des Austragselements, da das Austragselement mit dem Mahlteller rotiert und die Bypass-Vorrichtung statisch fixiert sein kann.The vertical roller mill according to the invention has a grinding table, at least one grinding roller, a nozzle ring, an air supply device and at least one discharge element. The nozzle ring surrounds the grinding table horizontally, which means that the nozzle ring is arranged annularly in the same plane around the grinding table. The air supply device is arranged below the nozzle ring and below the air supply device, the at least one discharge element is arranged. According to the invention, the vertical roller mill has at least one bypass device, wherein the at least one bypass device forms a connection between the nozzle ring and the at least one discharge element. Preferably, the at least one bypass device has no direct contact with the walls of the discharge element, since the discharge element rotates with the grinding plate and the bypass device can be statically fixed.

Durch die wenigstens eine Bypass-Vorrichtung wird am Ort der Bypass-Vorrichtung im Düsenring ein strömungsberuhiger Bereich erzeugt. In diesem Bereich kann praktisch jedes Material unabhängig von Größe und spezifischem Gewicht durch die wenigstens eine Bypass-Vorrichtung ausgetragen werden. Hierdurch wird auch Eisen unabhängig von der Partikelgröße aus dem Bereich des Mahltellers ausgetragen, eine Anreicherung kann vermieden werden.By the at least one bypass device, a flow-calming area is generated at the location of the bypass device in the nozzle ring. In this area, virtually any material, regardless of size and specific gravity, can be discharged through the at least one bypass device. As a result, iron is discharged regardless of the particle size of the grinding table, an enrichment can be avoided.

Die Bypass-Vorrichtung kann beispielsweise rohrförmig mit beispielsweise rundem, ovalem, oder eckigem Querschnitt ausgeführt sein. Besonders bevorzugt ist der runde Querschnitt.The bypass device can be designed, for example, tubular with, for example, a round, oval, or angular cross-section. Particularly preferred is the round cross-section.

In einer Ausführungsform der Erfindung weist die wenigstens eine Bypass-Vorrichtung im Bereich der Luftzufuhrvorrichtung eine gasundurchlässige Außenhaut auf. Beispielsweise handelt es sich bei der gasundurchlässigen Außenhaut um eine Metallwand, eine Kunststoffwand oder eine Verbundwerkstoffwand, insbesondere eine Glasfaserverbundwerkstoffwand oder eine Kohlefaserverbundwerkstoffwand. Unter gasundurchlässig im Sinne der Erfindung wird hierbei lediglich verstanden, dass die Außenhaut für die vergleichsweise starke Gasströmung im Bereich der Luftzufuhrvorrichtung undurchlässig ist und so keine nennenswerte Strömung im Bereich des Düsenrings erzeugt. Fragen der Gasdiffusion sind daher im Sinne dieser Erfindung unbeachtlich.In one embodiment of the invention, the at least one bypass device in the region of the air supply device has a gas-impermeable outer skin. For example, the gas-impermeable outer skin is a metal wall, a plastic wall or a Composite wall, in particular a glass fiber composite wall or a carbon fiber composite wall. Under gas-impermeable in the context of the invention is here only understood that the outer skin for the comparatively strong gas flow in the air supply device is impermeable and thus generates no significant flow in the region of the nozzle ring. Questions of gas diffusion are therefore irrelevant in the context of this invention.

In einer weiteren Ausführungsform der Erfindung entspricht die Anzahl der Bypass-Vorrichtungen der Anzahl der Mahlrollen. Alternativ entspricht die Anzahl der Bypass-Vorrichtungen einem ganzzahligen Vielfachen der Anzahl der Mahlrollen. Besonders bevorzugt weist die Vertikal-Rollenmühle zwei bis sechs Mahlrollen und zwei bis sechs Bypass-Vorrichtungen auf.In a further embodiment of the invention, the number of bypass devices corresponds to the number of grinding rollers. Alternatively, the number of bypass devices corresponds to an integer multiple of the number of grinding rollers. Most preferably, the vertical roller mill has two to six milling rollers and two to six bypass devices.

In einer weiteren Ausführungsform der Erfindung weist die Vertikal-Rollenmühle wenigstens zwei Bypass-Vorrichtungen auf. Die wenigstens zwei Bypass-Vorrichtungen sind äquidistant angeordnet. Bei zwei Bypass-Vorrichtungen ergibt sich, dass diese um 180 ° auf dem Düsenring beabstandet sind, bei drei Bypass-Vorrichtungen um 120 ° und bei vier Bypass-Vorrichtungen um 90 °. Weist die Vertikal-Rollenmühle ein ganzzahliges Vielfaches an Bypass-Vorrichtungen im Vergleich zur Anzahl der Mahlrollen auf, so können Gruppen von Bypass-Vorrichtungen, welche eine Anzahl entsprechend dem ganzzahligen Vielfachen entsprechen, zueinander äquidistant angeordnet sein.In a further embodiment of the invention, the vertical roller mill has at least two bypass devices. The at least two bypass devices are arranged equidistantly. Two bypass devices are found to be 180 ° apart on the nozzle ring, 120 ° for three bypass devices, and 90 ° for four bypass devices. If the vertical roller mill has an integer multiple of bypass devices compared to the number of grinding rollers, then groups of bypass devices corresponding to a number corresponding to the integer multiple may be arranged equidistant from each other.

In einer weiteren Ausführungsform der Erfindung weist die wenigstens eine Bypass-Vorrichtung eine Querschnittsfläche an der Oberfläche des Düsenrings auf, wobei die Querschnittsfläche der wenigstens einen Bypass-Vorrichtung weniger als 2,5% der Oberfläche des Mahltellers beträgt.In a further embodiment of the invention, the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 2.5% of the surface of the grinding table.

In einer weiteren bevorzugten Ausführungsform der Erfindung weist die wenigstens eine Bypass-Vorrichtung eine Querschnittsfläche an der Oberfläche des Düsenrings auf, wobei die Querschnittsfläche der wenigstens einen Bypass-Vorrichtung weniger als 1,0% der Oberfläche des Mahltellers beträgt.In a further preferred embodiment of the invention, the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 1.0% of the surface of the grinding table.

In einer weiteren bevorzugten Ausführungsform der Erfindung weist die wenigstens eine Bypass-Vorrichtung eine Querschnittsfläche an der Oberfläche des Düsenrings auf, wobei die Querschnittsfläche der wenigstens einen Bypass-Vorrichtung weniger als 0,5% der Oberfläche des Mahltellers beträgt.In a further preferred embodiment of the invention, the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is less than 0.5% of the surface of the grinding table.

Die wenigstens eine Bypass-Vorrichtung beeinträchtigt selbstverständlich die Funktionsweise und damit die Effizienz des Düsenrings. Insbesondere wird durch die wenigstens eine Bypass-Vorrichtung auch Produkt mit ausgetragen. Daher ist eine zu hohe Bypassrate, welche sich durch eine zu große Querschnittsfläche der wenigstens einen Bypass-Vorrichtung ergeben würde, nicht sinnvoll.Of course, the at least one bypass device affects the operation and thus the efficiency of the nozzle ring. In particular, product is also carried by the at least one bypass device. Therefore, an excessively high bypass rate, which would result from an excessively large cross-sectional area of the at least one bypass device, does not make sense.

In einer weiteren Ausführungsform der Erfindung weist die wenigstens eine Bypass-Vorrichtung eine Querschnittsfläche an der Oberfläche des Düsenrings auf, wobei die Querschnittsfläche der wenigstens einen Bypass-Vorrichtung mindestens 0,01 % der Oberfläche des Mahltellers beträgt.In a further embodiment of the invention, the at least one bypass device has a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of the at least one bypass device is at least 0.01% of the surface of the grinding table.

In einer weiteren Ausführungsform der Erfindung weisen alle Bypass-Vorrichtungen gemeinsam eine Querschnittsfläche an der Oberfläche des Düsenrings auf, wobei die Querschnittsfläche aller Bypass-Vorrichtungen gemeinsam weniger als 2,5 % der Oberfläche des Mahltellers beträgt.In a further embodiment of the invention, all the bypass devices together have a cross-sectional area on the surface of the nozzle ring, wherein the cross-sectional area of all the bypass devices together is less than 2.5% of the surface of the grinding table.

In einer weiteren Ausführungsform der Erfindung beträgt die Summe aller Querschnittsflächen aller Bypass-Vorrichtungen an der Oberfläche des Düsenrings weniger als 10 % der Oberfläche des Düsenrings.In a further embodiment of the invention, the sum of all cross-sectional areas of all bypass devices on the surface of the nozzle ring is less than 10% of the surface of the nozzle ring.

In einer weiteren bevorzugten Ausführungsform der Erfindung beträgt die Summe aller Querschnittsflächen aller Bypass-Vorrichtungen an der Oberfläche des Düsenrings weniger als 5 % der Oberfläche des Düsenrings.In a further preferred embodiment of the invention, the sum of all cross-sectional areas of all bypass devices on the surface of the nozzle ring is less than 5% of the surface of the nozzle ring.

In einer weiteren Ausführungsform der Erfindung weist die Bypass-Vorrichtung einen größten Querschnitt von weniger als 250 mm auf. Unter dem größten Querschnitt ist beispielsweise bei einem runden Querschnitt der Durchmesser, bei einem rechtwinkligen Querschnitt die Diagonale zwischen gegenüberliegenden Ecken zu verstehen. Der größte Querschnitt stellt somit die größte Dimension dar, welche der Querschnitts eines Partikels in der gleichen Ebene aufweisen kann, sodass das Partikel durch die Bypass-Vorrichtung passieren kann.In a further embodiment of the invention, the bypass device has a largest cross section of less than 250 mm. Under the largest cross-section is for example at a round cross-section of the diameter to understand in a rectangular cross-section the diagonal between opposite corners. The largest cross-section thus represents the largest dimension that the cross section of a particle in the same plane can have, so that the particle can pass through the bypass device.

In einer weiteren bevorzugten Ausführungsform der Erfindung weist die Bypass-Vorrichtung einen größten Querschnitt von weniger als 200 mm auf.In a further preferred embodiment of the invention, the bypass device has a largest cross section of less than 200 mm.

In einer weiteren bevorzugten Ausführungsform der Erfindung weist die Bypass-Vorrichtung einen größten Querschnitt von weniger als 100 mm auf.In a further preferred embodiment of the invention, the bypass device has a largest cross section of less than 100 mm.

In einer weiteren Ausführungsform weist die Bypass-Vorrichtung einen größten Querschnitt von wenigstens 20 mm auf.In a further embodiment, the bypass device has a largest cross section of at least 20 mm.

In einer weiteren Ausführungsform weist die Bypass-Vorrichtung einen größten Querschnitt von wenigstens 40 mm auf.In a further embodiment, the bypass device has a largest cross section of at least 40 mm.

In einer weiteren Ausführungsform der Erfindung ist hinter dem Austragselement ein Abscheider angeordnet. Bevorzugt ist der Abscheider ein Magnetabscheider, besonders bevorzugt ist der Magnetabscheider ausgewählt aus der Gruppe umfassend Trommelmagnetabscheider und Überbandmagnetabscheider.In a further embodiment of the invention, a separator is arranged behind the discharge element. Preferably, the separator is a magnetic separator, more preferably, the magnetic separator is selected from the group comprising Trommelmagnetabscheider and Überbandmagnetabscheider.

In einer weiteren Ausführungsform der Erfindung ist hinter dem Abscheider eine Materialrückführung zum Mahlteller angeordnet. Durch den Abscheider kann insbesondere das Eisen entfernt werden. Die anderen Komponenten enthalten regelmäßig das Edukt oder das Produkt, sodass diese vorteilhafterweise dem Mahlteller wieder zugeführt werden.In a further embodiment of the invention, a material return to the grinding table is arranged behind the separator. In particular, the iron can be removed by the separator. The other components regularly contain the educt or the product, so that they are advantageously fed back to the grinding table.

In einer weiteren Ausführungsform der Erfindung weist die Bypass-Vorrichtung am oberen Ende an Düsenring eine größere Querschnittsfläche als am unteren Ende am Austragselement auf. Beispielsweise ist die Bypass-Vorrichtung kegelförmig ausgeführt. Dieses hat den Vorteil, dass durch den geringeren Durchmesser am unteren Ende weniger Luft aus der Luftzufuhreinrichtung über das Austragselement in die Bypass-Vorrichtung gelangen kann und somit der Strömungsbereich oberhalb der Bypass-Vorrichtung besonders effizient beruhigt werden kann.In a further embodiment of the invention, the bypass device has a larger cross-sectional area at the upper end on the nozzle ring than at the lower end on the discharge element. For example, the bypass device is designed conical. This has the advantage that due to the smaller diameter at the lower end less air can pass from the air supply device via the discharge element in the bypass device and thus the flow area above the bypass device can be calmed particularly efficient.

In einer weiteren Ausführungsform der Erfindung ist die Bypass-Vorrichtung innerhalb einem unterdurchschnittlich durchströmten Bereich der Luftzufuhrvorrichtung angeordnet. Auch diese Anordnung führt dazu, dass weniger Luft aus der Luftzufuhreinrichtung über das Austragselement in die Bypass-Vorrichtung gelangen kann und somit der Strömungsbereich oberhalb der Bypass-Vorrichtung besonders effizient beruhigt werden kann. Besonders bevorzugt befindet sich die Bypass-Vorrichtung in einem Bereich mit ausreichendem Materialabwurf vom Mahlteller. Unter ausreichend wird in diesem Zusammenhang ein Bereich mit örtlich überdurchschnittlichem Materialabwurf verstanden.In a further embodiment of the invention, the bypass device is arranged within a below average flowed through area of the air supply device. This arrangement also results in less air being able to pass from the air supply device via the discharge element into the bypass device, and thus the flow region above the bypass device can be calmed particularly efficiently. Particularly preferably, the bypass device is located in an area with sufficient material discharge from the grinding table. Sufficient is understood in this context, an area with locally above average material disposal.

In einer weiteren Ausführungsform der Erfindung weist das Auftragselement eine Verschlussklappe auf und die Bypass-Vorrichtung weist eine maximale Entfernung von 950 mm zur Unterkante des Austragselements auf. Durch den vergleichsweise geringen Abstand kann weniger Luft aus der Luftzufuhreinrichtung über das Austragselement in die Bypass-Vorrichtung gelangen und somit kann der Strömungsbereich oberhalb der Bypass-Vorrichtung besonders effizient beruhigt werden.In a further embodiment of the invention, the applicator element has a closure flap and the bypass device has a maximum distance of 950 mm from the lower edge of the dispensing element. Due to the comparatively small distance, less air can pass from the air supply device via the discharge element into the bypass device, and thus the flow region above the bypass device can be calmed particularly efficiently.

In einer weiteren bevorzugten Ausführungsform der Erfindung weist das Auftragselemente eine Verschlussklappe auf und die Bypass-Vorrichtung weist eine maximale Entfernung von 750 mm zur Unterkante des Austragselements auf.In a further preferred embodiment of the invention, the applicator elements have a closure flap and the bypass device has a maximum distance of 750 mm from the lower edge of the dispensing element.

In einer weiteren bevorzugten Ausführungsform der Erfindung weist das Auftragselemente eine Verschlussklappe auf und die Bypass-Vorrichtung weist eine maximale Entfernung von 550 mm zur Unterkante des Austragselements auf.In a further preferred embodiment of the invention, the applicator elements have a closure flap and the bypass device has a maximum distance of 550 mm from the lower edge of the dispensing element.

In einer weiteren Ausführungsform der Erfindung weist die Vertikal-Rollenmühle eine Symmetrieachse, besonders bevorzugt eine dreizählige Drehachse (C3 nach Schönflies), eine vierzählige Drehachse (C4 nach Schönflies) oder eine sechszählige Drehachse (C6 nach Schönflies), auf.In a further embodiment of the invention, the vertical roller mill on an axis of symmetry, particularly preferably a threefold axis of rotation (C 3 after Schönflies), a vierzählige axis of rotation (C 4 after Schönflies) or a sechzählige axis of rotation (C 6 after Schönflies) on.

Nachfolgend ist die erfindungsgemäße Vertikal-Rollenmühle anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert.

Figur 1:
Schematischer Querschnitt durch eine Vertikal-Rollenmühle
Figur 2:
Schematische Aufsicht auf eine Vertikal-Rollenmühle
Figur 3:
Schematische Darstellung einer Bypass-Vorrichtung
Below, the vertical roller mill according to the invention is explained in more detail with reference to an embodiment shown in the drawings.
FIG. 1:
Schematic cross section through a vertical roller mill
FIG. 2:
Schematic view of a vertical roller mill
FIG. 3:
Schematic representation of a bypass device

In Figur 1 ist ein schematischer Querschnitt der Vertikal-Rollenmühle 10 gezeigt und in Figur 2 eine schematische Aufsicht auf die Ebene des Mahlteller 20. Der Mahlteller 20 weist bespielsweise einen Durchmesser von etwa 4,5 m auf, der Düsenring 40 eine Breite von etwa 40 cm. Oberhalb des Mahltellers 20 befinden sich in dieser beispielhaften Vertikal-Rollenmühle 10 drei Mahlrollen 30, von denen nur eine in Figur 1 zu sehen ist. Unterhalb des Düsenrings 40 befindet sich die Luftzufuhreinrichtung 50, in welche über drei Lufteinlässe (in Figur 2 zu erkennen) Luft eingeführt wird, welche durch den Düsenring 40 nach oben steigt und das gemahlene Produkt aus der Vertikal-Rollenmühle 10 austrägt. Im Bereich der Luftzufuhreinrichtung 50 ist ein Austragselement 60 angeordnet, in welchem durch die den Düsenring 40 fallendes Material aufgefangen wird. Hierbei handelt es sich im Regelfall um große und vergleichsweise schwere Partikel. Diese werden durch eine Verschlussklappe 80 einem Abscheider 90 zugeführt. In dem Abscheider 90, welcher in diesem Beispiel als Magnetabscheider ausgeführt ist, werden Eisenpartikel entfernt. Das restliche Material wird über die Rückführung 100 wieder dem Mahlteller 20 zugeführt. Zusätzlich verfügt die Vertikal-Rollenmühle 10 über einen Luftauslass 105. Dieser Aufbau entspricht insoweit einer Vertikal-Rollenmühle nach dem Stand der Technik.In FIG. 1 is shown a schematic cross section of the vertical roller mill 10 and in FIG. 2 a schematic plan view of the plane of the grinding table 20. The grinding table 20 has recordable, a diameter of about 4.5 m, the nozzle ring 40 has a width of about 40 cm. Above the grinding table 20 are in this exemplary vertical roller mill 10 three grinding rollers 30, of which only one in FIG. 1 you can see. Below the nozzle ring 40 is the air supply device 50, in which three air inlets (in FIG. 2 air) which rises through the nozzle ring 40 and discharges the milled product from the vertical roller mill 10. In the area of the air supply device 50, a discharge element 60 is arranged, in which the material falling through the nozzle ring 40 is collected. These are usually large and relatively heavy particles. These are fed through a closure flap 80 to a separator 90. In the separator 90, which is designed in this example as a magnetic separator, iron particles are removed. The remaining material is fed back to the grinding table 20 via the return 100. In addition, the vertical roller mill 10 has an air outlet 105. This structure corresponds in this respect to a vertical roller mill according to the prior art.

Die erfindungsgemäße Vertikal-Rollenmühle 10 weist zusätzlich in dem gezeigten Beispiel drei Bypass-Vorrichtungen 70, welche vom Düsenrings 40 in das Austragselement 60 führen. Da das Austragelement 60 in Form einer Vertiefung unterhalb der Luftzufuhreinrichtung 50 ausgeführt ist, ist dieser Bereich strömungsreduziert, wodurch nur sehr wenig Luft vom Lufteinlass 55 durch die Luftzufuhreinrichtung 50, das Austragselement 60 und die Bypass-Vorrichtungen 70 geleitet wird. Hierdurch ist die Strömung oberhalb der Bypass-Vorrichtungen 70 stark reduziert und so können auch kleine und somit vergleichsweise leichte Eisenpartikel durch die Bypass-Vorrichtungen 70 ausgetragen werden.The inventive vertical roller mill 10 additionally has, in the example shown, three bypass devices 70 which lead from the nozzle ring 40 into the discharge element 60. Since that Austragelement 60 is designed in the form of a depression below the air supply means 50, this area is flow-reduced, whereby only a small amount of air from the air inlet 55 through the air supply means 50, the discharge element 60 and the bypass devices 70 is passed. As a result, the flow above the bypass devices 70 is greatly reduced and so even small and thus comparatively light iron particles can be discharged through the bypass devices 70.

Wie Figur 2 zu entnehmen, sind die Bypass-Vorrichtungen 70 mit einem strömungstechnisch maximalen Abstand zu den drei Lufteinlässen 55 orientiert. Hierdurch wird zusätzlich die durch die Bypass-Vorrichtungen 70 strömende Luft reduziert.As FIG. 2 can be seen, the bypass devices 70 are oriented with a maximum fluidic distance from the three air inlets 55. This additionally reduces the air flowing through the bypass devices 70.

In Figur 3 ist eine Bypass-Vorrichtung 70 gezeigt, wobei die Bypass-Vorrichtung 70 im oberen Bereich mit zusätzlichen Materialleitblechen 75 aufweist, die im Bereich des Düsenrings 40 den Materialeintrag in die Bypass-Vorrichtung 70 erhöhen. In Figur 3a ist im Querschnitt die Trichterfunktion des Materialleitblechs 75 zu erkennen, in Figur 3b ist in der Aufsicht das Verhältnis zwischen dem Durchmesser der Bypass-Vorrichtung 70 und des Materialleitblechs gut erkennbar.In FIG. 3 a bypass device 70 is shown, wherein the bypass device 70 in the upper region with additional material baffles 75 which increase the material input into the bypass device 70 in the region of the nozzle ring 40. In FIG. 3a is to recognize the funnel function of the Materialleitblechs 75 in cross section, in FIG. 3b In the top view, the ratio between the diameter of the bypass device 70 and the Materialleitblechs well visible.

Bezugszeichen:Reference numerals:

1010
Vertikal-RollenmühleVertical roller mill
2020
Mahltellergrinding table
3030
Mahlrollegrinding roller
4040
Düsenringnozzle ring
5050
LuftzufuhreinrichtungAir supply means
5555
Lufteinlassair intake
6060
Austragselementdischarge element
7070
Bypass-VorrichtungBypass device
7575
Materialleitblech an Bypass-VorrichtungMaterial baffle on bypass device
8080
Verschlussklappeflap
9090
Abscheiderseparators
100100
Rückführungreturn
105105
Luftauslassair outlet

Claims (15)

  1. Vertical roll mill (10) having a grinding plate (20), having at least one grinding roll (30) and having a nozzle ring (40), wherein the nozzle ring (40) horizontally surrounds the grinding plate (20), wherein an air feed apparatus is arranged below the nozzle ring (40), the vertical roll mill (10) comprises at least one bypass apparatus (70) arranged in the nozzle ring (40), characterized in that at least one discharge element (60) is arranged below the air feed device (50) and in that the at least one bypass apparatus (70) forms a connection between the nozzle ring (40) and the at least one discharge element (60).
  2. Vertical roll mill (10) according to Claim 1, characterized in that the at least one bypass apparatus (70) comprises a gas-impermeable outer skin in the region of the air feed apparatus.
  3. Vertical roll mill (10) according to one of the preceding claims, characterized in that the number of bypass apparatuses (70) corresponds to the number of grinding rolls (30).
  4. Vertical roll mill (10) according to one of the preceding claims, characterized in that the vertical roll mill (10) comprises at least two bypass apparatuses (70), and in that the at least two bypass apparatuses (70) are arranged equidistantly.
  5. Vertical roll mill (10) according to one of the preceding claims, characterized in that the at least one bypass apparatus (70) comprises a cross-sectional area at the surface of the nozzle ring (40), wherein the cross-sectional area of the at least one bypass apparatus (70) amounts to less than 2.5%, preferably less than 1.0%, in particular less than 0.5% of the surface area of the grinding plate (20).
  6. Vertical roll mill (10) according to one of the preceding claims, characterized in that the sum of all of the cross-sectional areas of all of the bypass apparatuses (70) at the surface of the nozzle ring (40) amounts to less than 10% of the surface area of the nozzle ring (40).
  7. Vertical roll mill (10) according to one of the preceding claims, characterized in that the sum of all of the cross-sectional areas of all of the bypass apparatuses (70) at the surface of the nozzle ring (40) amounts to less than 5% of the surface area of the nozzle ring (40).
  8. Vertical roll mill (10) according to one of the preceding claims, characterized in that the bypass apparatus (70) comprises a largest cross section of less than 250 mm.
  9. Vertical roll mill (10) according to one of the preceding claims, characterized in that the bypass apparatus (70) comprises a largest cross section of at least 20 mm.
  10. Vertical roll mill (10) according to one of the preceding claims, characterized in that a separator (90) is arranged downstream of the discharge element (60).
  11. Vertical roll mill (10) according to Claim 10, characterized in that the separator (90) is a magnetic separator.
  12. Vertical roll mill (10) according to Claim 11, characterized in that the magnetic separator is selected from the group comprising drum-type magnetic separator and overbelt magnetic separator.
  13. Vertical roll mill (10) according to one of Claims 10 to 12, characterized in that a material return line (100) to the grinding plate (20) is arranged downstream of the separator (90).
  14. Vertical roll mill (10) according to one of the preceding claims, characterized in that the bypass apparatus (70) comprises a larger cross-sectional area at the upper end at the nozzle ring (40) than at the lower end at the discharge element (60).
  15. Vertical roll mill (10) according to one of the preceding claims, characterized in that the bypass apparatus (70) is arranged within a region, which exhibits a below-average throughflow, of the air feed apparatus.
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DE102015203856.4A DE102015203856A1 (en) 2015-03-04 2015-03-04 Vertical roller mill
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DK3265233T3 (en) 2019-08-05
US20180078942A1 (en) 2018-03-22
EP3265233A1 (en) 2018-01-10
CN107405626A (en) 2017-11-28
DE102015203856A1 (en) 2016-12-15
JP2018507106A (en) 2018-03-15
JP6899776B2 (en) 2021-07-07
US10843200B2 (en) 2020-11-24
WO2016139105A1 (en) 2016-09-09
DK3265233T5 (en) 2019-08-19

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