EP2879798A2 - Vertical roller mill - Google Patents
Vertical roller millInfo
- Publication number
- EP2879798A2 EP2879798A2 EP13736839.5A EP13736839A EP2879798A2 EP 2879798 A2 EP2879798 A2 EP 2879798A2 EP 13736839 A EP13736839 A EP 13736839A EP 2879798 A2 EP2879798 A2 EP 2879798A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller mill
- nozzle ring
- vertical roller
- radius
- gas inlets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
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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
- B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
-
- 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
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
Definitions
- the invention relates to a VertikalroUenmühle with at least one grinding roller and a grinding table and arranged around the grinding plate nozzle ring.
- a VertikalroUenmühle is known for example from DE 38 39 419 AI, in which the material to be crushed is fed via a chute or a shaft to the grinding table and then crushed under the action of the grinding rollers.
- the shredded material is discharged through the edge of the grinding table and from there pneumatically fed to a sifter above the mill.
- the required air flow is supplied via a arranged around the grinding plate nozzle ring.
- an annular space arranged below the nozzle ring is provided which is supplied with air via at least one gas inlet.
- a plurality of circumferentially distributed and tangentially connected gas inlets are also provided according to a first embodiment.
- a second embodiment is provided in which the air of the single gas inlet is divided by a part is introduced directly into the annulus, while the other part is guided around the annulus and fed on the opposite side.
- a loss of velocity of the gas stream due to the longer path can be compensated by a continuously tapering cross section.
- the invention is therefore based on the object to provide a new concept for a homogenization of the supplied volume flow in the annulus below the nozzle ring.
- the vertical roller mill according to the invention has at least one, preferably a plurality of grinding rollers and a grinding plate and a nozzle ring arranged around the grinding plate, which is in communication with an annular space arranged underneath, wherein the annular space has at least two gas inlets distributed over its circumference, which are tangential in the same direction of rotation open, and the annular space is limited to the outside between the gas inlets in each case by a spiral wall.
- the inflowing gas streams can be optimally balanced by the generated circular swirl flow, although the space conditions in the annular space are usually only very limited.
- each spiral wall tapers from a first radius to a second, smaller radius. It has also been found to be advantageous if there is a vertical distance of at least the width of the nozzle ring between the nozzle ring and an upper edge of the gas inlets. This will be sufficient Deflection space created for the usually horizontally entering the annulus gas flows to the upward flow through the nozzle ring.
- a collar for deflecting the gas streams introduced via the gas inlets is provided between the upper edge of the gas inlets and the nozzle ring.
- This collar may, for example, widen conically from the upper edge of the gas inlets to the nozzle ring.
- the diameter of the collar in the region of the nozzle ring substantially corresponds to the minimum outer diameter of the nozzle ring in order to ensure an optimal connection to the nozzle ring.
- the radius of the collar can expediently not be greater than the smaller second radius of the spiral wall in the region of the upper edge of the gas inlets.
- the nozzle ring may be formed both circular and non-circular, the collar preferably has a circular shape and is drawn inwardly at least to the extent that the helical walls between the gas inlets are covered.
- the minimum angle of the collar relative to the horizontal can be specified in particular with 0 to 45 °, preferably in the range 25 to 35 °.
- the spiral walls extend over the height of the gas inlets and the annular space between the upper edges of the gas inlets and the nozzle ring is limited by a cylindrical wall.
- the nozzle ring is circular, wherein the first radius of the spiral walls corresponds to the outer radius of the nozzle ring.
- the radius of the cylindrical wall corresponds to the first radius of the spiral walls and the spiral walls are covered with a ring plate whose outer radius corresponds to the radius of the cylindrical wall and whose inner radius is less than or equal to the second radius of the spiral walls.
- the ratio of the amount of cylindrical wall to the width of the ring plate preferably at least 0.4.
- the collar is oriented at an angle relative to the horizontal, which is smaller than the angle of repose of the ground through falling through the nozzle ring, especially in the case of the ring plate, a conical collar of bulk material will form, which also serves the function of targeted and uniform deflection allows the air masses.
- the collar may be provided in segments with recesses, thereby the in
- FIG. 3 is a schematic sectional view of the annular space according to a first embodiment
- FIG. 4 is a schematic sectional view of the annular space according to a second embodiment
- FIG. 7a - 7c different views of an annular space with three gas inlets
- FIG. 8a - 8c different views of an annular space with four gas inlets.
- the vertical roller mill according to FIG. 1 has a plurality of grinding rollers 1 which cooperate with a grinding table 2 for comminuting ground material.
- a separator 4 arranged above the grinding plate is further provided.
- Grist 5 passes through a feed chute 6 in a known manner on the grinding table 2 and from there under the grinding rollers 1.
- the comminuted material passes through the centrifugal force of the rotating grinding table 2 on the Mahltellerrand 2a and is there from a about one to the grinding table 2 arranged nozzle ring 7 supplied sight gas stream 8 detected and transported upwards in the separator 4.
- the sifter 4 is designed, for example, as a rod sifter and returns the coarse material back to the grinding table, while the fine material is removed together with the sifting gas stream 8 via an outlet 4a.
- the nozzle ring 7 communicates with an annular space 9 arranged underneath, which has at least two gas inlets 10, 11 distributed over its circumference.
- the annular space 9 serves to equalize the supplied via the gas inlets the sight gas.
- the sight gas 8 of the nozzle ring is provided in a known manner with a plurality of nozzle ring blades.
- the actual invention relates to the design of the annular space 9 with the connected gas inlets and will be explained in more detail below.
- FIGS. 2a to 2c show a first exemplary embodiment of the annular space 9 in the variant with two gas inlets 10, 11.
- Fig. 3 this example is shown in a schematic sectional view.
- Both gas inlets 10, 11 open in the same direction of rotation tangentially into the annular space 9 and are arranged offset by 180 °.
- the annular space 9 is bounded inwardly by the grinding table 2 or its substructure and outwardly between the two gas inlets 10, 11 by spiral walls 14, 15.
- Each spiral wall 14, 15 tapers from a first radius R1 to a second smaller radius R2.
- the vertical height of the spiral walls 14, 15 corresponds to the vertical height of the gas inlets 10, 11th
- a vertical distance a is provided between the nozzle ring 7 and the upper edges of the gas inlets 10, 11, a vertical distance a is provided.
- the upper edge of the gas inlet 10 is provided with the reference numeral 10a.
- This vertical distance a is preferably at least as large as the width b of the nozzle ring 7.
- the nozzle ring 7 is circular. However, other forms, such as an angularly rounded shape, are conceivable within the scope of the invention.
- the minimum outer diameter of the nozzle ring corresponds to twice the first radius Rl of the spiral walls 10, 11.
- the annular space is between the upper edges of the gas inlets 10, 11 and the nozzle ring either by a conically widening towards the nozzle ring collar 20 (see Fig. 3) or by a cylindrical wall 21 (see Fig. 4) limited.
- the collar is preferably circular in shape and pulled inwards at least so far that the spiral walls 14, 15 are covered from above.
- the inner boundary of the collar 20 is shown in dashed lines in Fig. 2a.
- the collar supports the deflection of the visual gas 8, wherein the angle ⁇ relative to the horizontal should preferably be in the range of 25 to 35 °.
- a horizontal annular plate 22 is provided at the level of the upper edge of the gas inlets 10, 11, whose Outer diameter corresponds to the diameter of the cylindrical wall 21 and whose inner diameter is less than or equal to twice the second radius R2 of the spiral walls.
- the annular plate 22 covers the resulting by the inwardly tapering spiral walls 14 and 15 resulting gaps 18, 19 (see Fig. 2a).
- this is correspondingly covered on its underside so that the classifying gas does not unintentionally enter below the collar (see FIG. 3).
- This conical pile then assumes the function of the conical collar 20 of FIG. 3.
- the ratio of the height of the cylindrical wall 21 and the width of the ring plate 22 is at least 0.4, so that a suitable pour cone 23 can form.
- the collar 20 is therefore provided with recesses 20a.
- the number of recesses corresponds expediently, the single or multiple multiples of the number of grinding rollers. 1
- the collar 20 with its four recesses 20a would therefore be suitable in particular for a vertical roller mill with four grinding rollers 1.
- the recesses 20a must be matched to the arrangement of the grinding rollers 1 in order to produce the desired flow of the classifying gas 8.
- the embodiment according to FIGS. 6a and 6b shows a polygonal shape of recesses 20b. Due to the shape and arrangement of the recesses, a targeted influencing of the passing through the nozzle ring 7 sighting gas 8 can be achieved. The homogenization in the annular space 9 ensures that the currents in the region of all recesses are equal or approximately equal. If the collar takes the shape of the horizontal ring plate 22, of course, corresponding recesses can also be provided there.
- FIGS. 8a and 8c shows an arrangement with four gas inlets 10, 11, 12, 13 with helical walls 14, 15, 16 and 17 arranged therebetween.
- the embodiments described above are characterized by a clean flow of the nozzle ring 7 with a swirling, circular flow, wherein a flow reversal in front of the nozzle ring is avoided by the collar 20 or the forming bulk cone 23.
- the amount of material that is not entrained by the classifying gas 8 and instead falls down through the nozzle ring can be significantly reduced.
- sucking in air from above the nozzle ring is avoided by the flow according to the invention of the nozzle ring. This also improves the sighting. Due to the recesses in the collar, the air volume distribution in the nozzle ring can be adapted flexibly to the needs. A uniform velocity distribution over the entire nozzle ring also ensures better flow of the classified classifier. 4
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
VertikalroUenmühle Vertical Rouen mill
Die Erfindung betrifft eine VertikalroUenmühle mit wenigstens einer Mahlrolle und einem Mahlteller sowie einem um den Mahlteller angeordneten Düsenring. The invention relates to a VertikalroUenmühle with at least one grinding roller and a grinding table and arranged around the grinding plate nozzle ring.
Eine VertikalroUenmühle ist beispielsweise aus der DE 38 39 419 AI bekannt, bei der das zu zerkleinernde Material über eine Schurre oder einen Schacht dem Mahlteller aufgegeben und dann unter Einwirkung der Mahlrollen zerkleinert wird. Das zerkleinerte Material wird über den Mahltellerrand ausgetragen und von dort pneumatisch zu einem oberhalb der Mühle angeordneten Sichter geführt. Der hierfür erforderliche Luftstrom wird über einen um den Mahlteller angeordneten Düsenring zugeführt. Hierzu ist ein unter dem Düsenring angeordneter Ringraum vorgesehen, der über wenigstens einen Gaseinlass mit Luft versorgt wird. A VertikalroUenmühle is known for example from DE 38 39 419 AI, in which the material to be crushed is fed via a chute or a shaft to the grinding table and then crushed under the action of the grinding rollers. The shredded material is discharged through the edge of the grinding table and from there pneumatically fed to a sifter above the mill. The required air flow is supplied via a arranged around the grinding plate nozzle ring. For this purpose, an annular space arranged below the nozzle ring is provided which is supplied with air via at least one gas inlet.
Man ist bestrebt, eine möglich gleichmäßige Verteilung der Luft über den Umfang des Düsenrings zu erreichen. Nachdem das Mahlgut üblicherweise im Bereich zwischen zwei aufeinanderfolgenden Mahlrollen ausgetragen wird, während im Bereich der Mahlrollen kein oder kaum Mahlgut über den Mahltellerrand tritt, ist es prinzipiell ausreichend, wenn alle Bereiche des Düsenrings, an denen das zerkleinerte Material vermehrt über den Mahltellerrand tritt, vergleichbare Strömungsverhältnisse aufweisen. Hierzu ist es erforderlich, dass die über den oder die Gaseinlässe in den Ringraum unter dem Düsenring eingeführte Sichtluft im Ringraum entsprechend gleichmäßig verteilt wird. Man hat daher auch schon vorgeschlagen, die Anzahl der Gaseinlässe an die Anzahl der Mahlrollen anzupassen und durch eine entsprechend Anstellung der Gaseinlässe für alle relevanten Bereiche des Düsenrings ähnliche Strömungseigenschaften zu erzeugen. Der Nachteil der angestellten Gaseinlässe besteht aber darin, dass dort die Luftmasse prinzipiell nicht gleichmäßig über den gesamten Umfang verteilt zugeführt werden kann. It is desirable to achieve a possible even distribution of air over the circumference of the nozzle ring. After the material to be ground is usually discharged in the area between two successive grinding rolls, while in the area of the grinding rolls no or hardly ground material passes over the edge of the grinding table, it is in principle sufficient if all areas of the nozzle ring at which the shredded material increasingly passes over the edge of the grinding table are comparable Have flow conditions. For this purpose, it is necessary that the introduced via the gas or the gas inlets in the annulus under the nozzle ring classifying air in the annulus is distributed accordingly evenly. It has therefore also been proposed to adapt the number of gas inlets to the number of grinding rollers and to produce similar flow characteristics by a corresponding adjustment of the gas inlets for all relevant areas of the nozzle ring. The disadvantage of salaried gas inlets, however, is that there the air mass in principle can not be distributed evenly distributed over the entire circumference.
In der US 2004/0 227 024 AI werden gemäß einem ersten Ausführungsbeispiel ebenfalls mehrere über den Umfang verteilt angeordnete und tangential angeschlossene Gaseinlässe vorgesehen. Für den Fall, dass nur ein Gaseinlass möglich ist, wird ein zweites Ausführungsbeispiel vorgesehen, bei dem die Luft des einzigen Gaseinlasses aufgeteilt wird, indem ein Teil gleich in den Ringraum eingeführt wird, während der andere Teil um den Ringraum herumgeführt und auf der gegenüberliegenden Seite zugeführt wird. Ein durch den längeren Weg bedingter Geschwindigkeitsverlust des Gasstromes kann durch einen sich kontinuierlich verjüngenden Querschnitt ausgeglichen werden. In the US 2004/0 227 024 AI a plurality of circumferentially distributed and tangentially connected gas inlets are also provided according to a first embodiment. In the event that only one gas inlet is possible, a second embodiment is provided in which the air of the single gas inlet is divided by a part is introduced directly into the annulus, while the other part is guided around the annulus and fed on the opposite side. A loss of velocity of the gas stream due to the longer path can be compensated by a continuously tapering cross section.
Der Erfindung liegt daher die Aufgabe zugrunde, ein neues Konzept für eine Vergleichmäßigung des zugeführten Volumenstroms im Ringraum unterhalb des Düsenrings anzugeben. The invention is therefore based on the object to provide a new concept for a homogenization of the supplied volume flow in the annulus below the nozzle ring.
Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruches 1 gelöst. According to the invention, this object is solved by the features of claim 1.
Die erfindungsgemäße Vertikalrollenmühle weist wenigstens eine, vorzugsweise mehrere Mahlrollen und einen Mahlteller sowie einen um den Mahlteller angeordneten Düsenring auf, der mit einem darunter angeordneten Ringraum in Verbindung steht, wobei der Ringraum wenigstens zwei über seinen Umfang verteilt angeordnete Gaseinlässe aufweist, die in gleicher Drehrichtung tangential einmünden, und der Ringraum nach außen zwischen den Gaseinlässen jeweils durch eine spiralförmige Wandung begrenzt wird. The vertical roller mill according to the invention has at least one, preferably a plurality of grinding rollers and a grinding plate and a nozzle ring arranged around the grinding plate, which is in communication with an annular space arranged underneath, wherein the annular space has at least two gas inlets distributed over its circumference, which are tangential in the same direction of rotation open, and the annular space is limited to the outside between the gas inlets in each case by a spiral wall.
Durch die spiralförmigen Wandungen und die in gleicher Drehrichtung tangential mündenden Gasleitungen können sich die einmündenden Gasströme durch die erzeugte zirkuläre Drallströmung optimal vergleichmäßigen, obwohl die Platzverhältnisse im Ringraum meist nur sehr eingeschränkt sind. Due to the spiral walls and the gas lines opening tangentially in the same direction of rotation, the inflowing gas streams can be optimally balanced by the generated circular swirl flow, although the space conditions in the annular space are usually only very limited.
Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unter anspräche. Further embodiments of the invention are the subject of the subclaims.
Gemäß einer bevorzugten Ausgestaltung der Erfindung verjüngt sich jede spiralförmige Wandung von einem ersten Radius auf einen zweiten, kleineren Radius. Es hat sich weiterhin als vorteilhaft herausgestellt, wenn zwischen dem Düsenring und einer Oberkante der Gaseinlässe ein vertikaler Abstand von wenigstens der Breite des Düsenrings besteht. Hierdurch wird ein ausreichender Umlenkraum für die üblicherweise horizontal in den Ringraum eintretenden Gasströme zu der nach oben gerichteten Strömung durch den Düsenring geschaffen. According to a preferred embodiment of the invention, each spiral wall tapers from a first radius to a second, smaller radius. It has also been found to be advantageous if there is a vertical distance of at least the width of the nozzle ring between the nozzle ring and an upper edge of the gas inlets. This will be sufficient Deflection space created for the usually horizontally entering the annulus gas flows to the upward flow through the nozzle ring.
Um diese Umlenkung zusätzlich zu unterstützen ist in einer bevorzugten Ausgestaltung der Erfindung vorgesehen, dass sich zwischen der Oberkante der Gaseinlässe und dem Düsenring ein Kragen zum Umlenken der über die Gaseinlässe eingeführten Gasströme vorgesehen ist. Dieser Kragen kann sich beispielsweise von der Oberkante der Gaseinlässe zum Düsenring konisch erweitern. Weiterhin kann vorgesehen werden, dass der Durchmesser des Kragens im Bereich des Düsenrings im Wesentlichen dem minimalen Aussendurchmesser des Düsenrings entspricht, um eine optimale Anbindung an den Düsenring zu gewährleisten. In order to additionally support this deflection, it is provided in a preferred embodiment of the invention that a collar for deflecting the gas streams introduced via the gas inlets is provided between the upper edge of the gas inlets and the nozzle ring. This collar may, for example, widen conically from the upper edge of the gas inlets to the nozzle ring. Furthermore, it can be provided that the diameter of the collar in the region of the nozzle ring substantially corresponds to the minimum outer diameter of the nozzle ring in order to ensure an optimal connection to the nozzle ring.
Der Radius des Kragens kann im Bereich der Oberkante der Gaseinlässe zweckmäßigerweise nicht größer als der kleinere zweite Radius der Spiralwandung ausgebildet werden. Wenngleich der Düsenring sowohl kreisförmig als auch nicht kreisförmig ausgebildet sein kann, weist der Kragen vorzugsweise eine kreisförmige Form auf und ist mindestens soweit nach innen gezogen, dass die spiralförmigen Wandungen zwischen den Gaseinlässen abgedeckt sind. The radius of the collar can expediently not be greater than the smaller second radius of the spiral wall in the region of the upper edge of the gas inlets. Although the nozzle ring may be formed both circular and non-circular, the collar preferably has a circular shape and is drawn inwardly at least to the extent that the helical walls between the gas inlets are covered.
Der minimale Winkel des Kragens gegenüber der Horizontalen kann insbesondere mit 0 bis 45°, vorzugsweise im Bereich 25 bis 35° angegeben werden. The minimum angle of the collar relative to the horizontal can be specified in particular with 0 to 45 °, preferably in the range 25 to 35 °.
In einer weiteren erfindungsgemäßen Ausgestaltung erstrecken sich die spiralförmigen Wandungen über die Höhe der Gaseinlässe und der Ringraum zwischen den Oberkanten der Gaseinlässe und dem Düsenring wird durch eine zylindrische Wandung begrenzt. Der Düsenring ist kreisförmig ausgebildet, wobei der erste Radius der spiralförmigen Wandungen dem Außenradius des Düsenrings entspricht. Weiterhin entspricht der Radius der zylindrischen Wandung dem ersten Radius der spiralförmigen Wandungen und die spiralförmigen Wandungen sind mit einem Ringblech abgedeckt, dessen Außenradius dem Radius der zylindrischen Wandung entspricht und dessen Innenradius kleiner oder gleich dem zweiten Radius der spiralförmigen Wandungen ist. Dabei kann das Verhältnis der Höhe der zylindrischen Wandung zur Breite des Ringblechs vorzugsweise wenigstens 0,4 betragen. In a further embodiment of the invention, the spiral walls extend over the height of the gas inlets and the annular space between the upper edges of the gas inlets and the nozzle ring is limited by a cylindrical wall. The nozzle ring is circular, wherein the first radius of the spiral walls corresponds to the outer radius of the nozzle ring. Furthermore, the radius of the cylindrical wall corresponds to the first radius of the spiral walls and the spiral walls are covered with a ring plate whose outer radius corresponds to the radius of the cylindrical wall and whose inner radius is less than or equal to the second radius of the spiral walls. The ratio of the amount of cylindrical wall to the width of the ring plate preferably at least 0.4.
Ist der Kragen mit einem Winkel gegenüber der Horizontalen ausgerichtet, der kleiner als der Schüttwinkel des durch den Düsenring nach unten durchfallenden Mahlgutes ist, insbesondere im Fall des Ringblechs, wird sich ein konischer Kragen aus Schüttgut bilden, der ebenfalls die Funktion der gezielten und gleichmäßigen Umlenkung der Luftmassen ermöglicht. If the collar is oriented at an angle relative to the horizontal, which is smaller than the angle of repose of the ground through falling through the nozzle ring, especially in the case of the ring plate, a conical collar of bulk material will form, which also serves the function of targeted and uniform deflection allows the air masses.
Um die Luftmenge im bestimmten Abschnitten des Düsenringen, insbesondere dort, wo der größte Anteil des zerkleinerten Materials über den Mahltellerrand tritt, kann der Kragen segmentweise mit Aussparungen versehen sein, um dadurch die im To the amount of air in certain sections of the nozzle rings, especially where the largest proportion of the crushed material passes over the Mahltellerrand, the collar may be provided in segments with recesses, thereby the in
Ringraum vergleichmäßigte Strömung gezielt in bestimmten Abschnitten zu verstärkten. Annular space to amplify uniformized flow targeted in certain sections.
Weitere Vorteile und Ausgestaltungen der Erfindung werden im Folgenden anhand der Beschreibung einiger Ausführungsbeispiele und der Zeichnung näher erläutert. Further advantages and embodiments of the invention will be explained in more detail below with reference to the description of some embodiments and the drawings.
In der Zeichnung zeigen schematische Seitenansicht einer erfindungsgemäßenIn the drawing show schematic side view of an inventive
Vertikalrollenmühle, Vertical roller mill,
Fig. 2a - 2c verschiedene Ansichten eines Ringraums mit zwei Gaseinlässen, 2a - 2c different views of an annular space with two gas inlets,
Fig. 3 eine schematische Schnittdarstellung des Ringraums gemäß einem ersten Ausführungsbeispiel, 3 is a schematic sectional view of the annular space according to a first embodiment,
Fig. 4 eine schematische Schnittdarstellung des Ringraums gemäß einem zweiten Ausführungsbeispiel, 4 is a schematic sectional view of the annular space according to a second embodiment,
Fig. 5a + 5b verschiedene Ansichten eines Kragens mit Aussparungen gemäß einer ersten Variante, Fig. 6a + 6b verschiedene Ansichten eines Kragens mit Aussparungen gemäß einer zweiten Variante, 5a and 5b different views of a collar with recesses according to a first variant, 6a + 6b different views of a collar with recesses according to a second variant,
Fig. 7a - 7c verschiedene Ansichten eines Ringraums mit drei Gaseinlässen und Fig. 7a - 7c different views of an annular space with three gas inlets and
Fig. 8a - 8c verschiedene Ansichten eines Ringraums mit vier Gaseinlässen. Fig. 8a - 8c different views of an annular space with four gas inlets.
Die Vertikalrollenmühle gemäß Fig. 1 weist mehrere Mahlrollen 1 auf, die mit einem Mahlteller 2 zur Zerkleinerung von Mahlgut zusammenwirken. Im Mühlengehäuse 3 ist ferner ein oberhalb des Mahltellers zwei angeordneter Sichter 4 vorgesehen. Mahlgut 5 gelangt über eine Aufgabeschurre 6 in bekannter Art und Weise auf dem Mahlteller 2 und von dort unter die Mahlrollen 1. Das zerkleinerte Mahlgut tritt durch die Fliehkraftwirkung des drehenden Mahltellers 2 über den Mahltellerrand 2a hinaus und wird dort von einem über einen um den Mahlteller 2 angeordneten Düsenring 7 zugeführten Sichtgasstrom 8 erfasst und nach oben in den Sichter 4 transportiert. Der Sichter 4 ist beispielsweise als Stabkorbsichter ausgebildet und führt das grobe Gut wieder auf dem Mahlteller zurück, während das feine Gut zusammen mit dem Sichtgasstrom 8 über einen Auslass 4a abgeführt wird. The vertical roller mill according to FIG. 1 has a plurality of grinding rollers 1 which cooperate with a grinding table 2 for comminuting ground material. In the mill housing 3, a separator 4 arranged above the grinding plate is further provided. Grist 5 passes through a feed chute 6 in a known manner on the grinding table 2 and from there under the grinding rollers 1. The comminuted material passes through the centrifugal force of the rotating grinding table 2 on the Mahltellerrand 2a and is there from a about one to the grinding table 2 arranged nozzle ring 7 supplied sight gas stream 8 detected and transported upwards in the separator 4. The sifter 4 is designed, for example, as a rod sifter and returns the coarse material back to the grinding table, while the fine material is removed together with the sifting gas stream 8 via an outlet 4a.
Der Düsenring 7 steht mit einem darunter angeordneten Ringraum 9 in Verbindung, der wenigstens zwei über seinen Umfang verteilt angeordnete Gaseinlässe 10, 11 aufweist. Der Ringraum 9 dient zur Vergleichmäßigung des über die Gaseinlässe zugeführten Sichtgases. Zur gezielten Ausrichtung des aus den Düsenring 7 austretenden Sichtgases 8 ist der Düsenring in bekannter Art und Weise mit einer Vielzahl von Düsenringschaufeln versehen. The nozzle ring 7 communicates with an annular space 9 arranged underneath, which has at least two gas inlets 10, 11 distributed over its circumference. The annular space 9 serves to equalize the supplied via the gas inlets the sight gas. For targeted alignment of the emerging from the nozzle ring 7 the sight gas 8 of the nozzle ring is provided in a known manner with a plurality of nozzle ring blades.
Die eigentliche Erfindung betrifft die Ausgestaltung des Ringraumes 9 mit den angeschlossenen Gaseinlässen und wird im Folgenden näher erläutert. The actual invention relates to the design of the annular space 9 with the connected gas inlets and will be explained in more detail below.
In den Figuren 2a bis 2c ist ein erstes Ausführungsbeispiel des Ringraumes 9 in der Variante mit zwei Gaseinlässen 10, 11 dargestellt. In Fig. 3 ist dieses Beispiel in einer schematischen Schnittdarstellung ersichtlich. Beide Gaseinlässe 10, 11 münden in gleicher Drehrichtung tangential in den Ringraum 9 ein und sind um 180° versetzt angeordnet. Der Ringraum 9 wird nach innen durch den Mahlteller 2 bzw. seinen Unterbau und nach außen zwischen den beiden Gaseinlässen 10, 11 durch spiralförmige Wandungen 14, 15 begrenzt. Jede spiralförmige Wandung 14, 15 verjüngt sich von einem ersten Radius Rl auf einen zweiten kleineren Radius R2. Man könnte auch davon sprechen, dass es sich um eine gleichläufiges Mehrfachspiralgehäuse handelt, wobei zwei Spiralgehäuse zueinander gedreht angeordnet und miteinander verschnitten sind. Die vertikale Höhe der spiralförmigen Wandungen 14, 15 entspricht dabei der vertikalen Höhe der Gaseinlässe 10, 11. FIGS. 2a to 2c show a first exemplary embodiment of the annular space 9 in the variant with two gas inlets 10, 11. In Fig. 3, this example is shown in a schematic sectional view. Both gas inlets 10, 11 open in the same direction of rotation tangentially into the annular space 9 and are arranged offset by 180 °. The annular space 9 is bounded inwardly by the grinding table 2 or its substructure and outwardly between the two gas inlets 10, 11 by spiral walls 14, 15. Each spiral wall 14, 15 tapers from a first radius R1 to a second smaller radius R2. One could also speak of the fact that it is a co-rotating multiple spiral housing, wherein two spiral housings are arranged rotated to each other and intersected. The vertical height of the spiral walls 14, 15 corresponds to the vertical height of the gas inlets 10, 11th
Zwischen dem Düsenring 7 und der Oberkanten der Gaseinlässe 10, 11 ist ein vertikale Abstand a vorgesehen. In Fig. 3 ist die Oberkante des Gaseinlasses 10 mit dem Bezugszeichen 10a versehen. Dieser vertikaler Abstand a ist vorzugsweise wenigstens so groß wie die Breite b des Düsenrings 7. Between the nozzle ring 7 and the upper edges of the gas inlets 10, 11, a vertical distance a is provided. In Fig. 3, the upper edge of the gas inlet 10 is provided with the reference numeral 10a. This vertical distance a is preferably at least as large as the width b of the nozzle ring 7.
Im dargestellten Ausführungsbeispiel ist der Düsenring 7 kreisförmig ausgebildet. Es sind aber im Rahmen der Erfindung auch andere Formen, wie beispielsweise eine eckig abgerundete Form, denkbar. Der minimale Außendurchmesser des Düsenrings entspricht dabei dem doppelten ersten Radius Rl der spiralförmigen Wandungen 10, 11. Der Ringraum wird zwischen den Oberkanten der Gaseinlässe 10, 11 und dem Düsenring entweder durch einen sich konisch zum Düsenring hin erweiternden Kragen 20 (siehe Fig. 3) oder durch eine zylindrische Wandung 21 (siehe Fig. 4) begrenzt. Der Kragen ist vorzugsweise kreisförmig ausgebildet und mindestens so weit nach innen gezogen, dass die spiralförmigen Wandungen 14, 15 von oben gesehen abgedeckt sind. Die innere Begrenzung des Kragens 20 ist in Fig. 2a gestrichelt eingezeichnet. Der Kragen unterstützt die Umlenkung des Sichtgases 8, wobei der Winkel α gegenüber der Horizontalen vorzugsweise im Bereich von 25 bis 35° liegen sollte. In the illustrated embodiment, the nozzle ring 7 is circular. However, other forms, such as an angularly rounded shape, are conceivable within the scope of the invention. The minimum outer diameter of the nozzle ring corresponds to twice the first radius Rl of the spiral walls 10, 11. The annular space is between the upper edges of the gas inlets 10, 11 and the nozzle ring either by a conically widening towards the nozzle ring collar 20 (see Fig. 3) or by a cylindrical wall 21 (see Fig. 4) limited. The collar is preferably circular in shape and pulled inwards at least so far that the spiral walls 14, 15 are covered from above. The inner boundary of the collar 20 is shown in dashed lines in Fig. 2a. The collar supports the deflection of the visual gas 8, wherein the angle α relative to the horizontal should preferably be in the range of 25 to 35 °.
Im Falle einer zylindrischen Wandung 21 gemäß Fig. 4 wird in Höhe der Oberkante der Gaseinlässe 10, 11 ein horizontales Ringblech 22 vorgesehen, dessen Außendurchmesser dem Durchmesser der zylindrischen Wandung 21 entspricht und dessen Innendurchmesser kleiner oder gleich dem doppelten zweiten Radius R2 der spiralförmigen Wandungen ist. Auf diese Weise deckt das Ringblech 22 die sich durch die nach innen verjüngenden spiralförmigen Wandungen 14 und 15 entstehenden Spalte 18, 19 (siehe Fig. 2a) ab. Auch im Falle des konischen Kragens gemäß Fig. 20 wird dieser auf seine Unterseite entsprechend abgedeckt, damit das Sichtgas nicht ungewollt unterhalb des Kragens eintritt (siehe Fig. 3). In the case of a cylindrical wall 21 as shown in FIG. 4, a horizontal annular plate 22 is provided at the level of the upper edge of the gas inlets 10, 11, whose Outer diameter corresponds to the diameter of the cylindrical wall 21 and whose inner diameter is less than or equal to twice the second radius R2 of the spiral walls. In this way, the annular plate 22 covers the resulting by the inwardly tapering spiral walls 14 and 15 resulting gaps 18, 19 (see Fig. 2a). Also in the case of the conical collar according to FIG. 20, this is correspondingly covered on its underside so that the classifying gas does not unintentionally enter below the collar (see FIG. 3).
Das zwischen Mahlrolle 1 und Mahlteller 2 zerkleinerte Material, welches über den Mahltellerrand 2a tritt und dort vom Sichtgas 8 erfasst wird, beinhaltet auch Partikel, die aufgrund ihrer Größe zu schwer sind und durch den Düsenring 7 nach unten in den Ringraum 9 fallen. Es wird sich daher auf dem Ringblech 22 ein Schüttkegel 23 aus diesem Material aufbauen. Dieser Schüttkegel übernimmt dann die Funktion des konischen Kragens 20 der Fig. 3. Das Verhältnis der Höhe der zylindrischen Wandung 21 und der Breite des Ringblechs 22 beträgt wenigstens 0.4, damit sich ein geeigneter Schüttkegel 23 ausbilden kann. The crushed between the grinding roller 1 and grinding plate 2 material which passes over the Mahltellerrand 2a and is detected there by the classifying gas 8, also includes particles that are too heavy due to their size and fall through the nozzle ring 7 down into the annular space 9. It will therefore build on the annular plate 22, a pour cone 23 of this material. This conical pile then assumes the function of the conical collar 20 of FIG. 3. The ratio of the height of the cylindrical wall 21 and the width of the ring plate 22 is at least 0.4, so that a suitable pour cone 23 can form.
Durch die tangentiale Einströmung des Sichtgases 8 über die wenigstens zwei Gaseinlässe 10, 11 in Verbindung mit den spiralförmigen Wandungen 14, 15 wird eine zirkuläre Drallströmung im Ringraum 9 erzeugt, die nach oben umgelenkt wird und eine saubere An- und Abströmung der Düsenringschaufeln des Düsenrings 7 gewährleistet. Es ist aber nicht erforderlich, dass die Gasströmung über den gesamten Umfang des Düsenrings 7 völlig gleichmäßig aus dem Düsenring austritt. Es ist vielmehr zweckmäßiger, jeweils die Abschnitte des Düsenrings, die zwischen zwei Mahlrollen vorgesehen sind, mit mehr Luft zu beaufschlagen, als die Abschnitte neben den Mahlrollen, da das Mahlgut zwischen den Mahlrollen über den Mahltellerrand tritt. Neben einer Vergleichmäßigung der Gasströmung im Ringraum 9 ist es gemäß einer weiteren Ausgestaltung der Erfindung vorgesehen, bestimmte Abschnitte des Düsenrings mit mehr bzw. weniger Sichtgas zu beaufschlagen. Im Ausführungsbeispiel gemäß den Figuren 5 a und 5b ist der Kragen 20 daher mit Aussparungen 20a versehen. Die Anzahl der Aussparungen entspricht zweckmäßigerweise dem einfachen oder mehrfachen Vielfachen der Anzahl der Mahlrollen 1. The tangential inflow of the sight gas 8 via the at least two gas inlets 10, 11 in conjunction with the spiral walls 14, 15, a circular swirl flow in the annular space 9 is generated, which is deflected upward and a clean arrival and flow of the nozzle ring vanes of the nozzle ring. 7 guaranteed. However, it is not necessary that the gas flow over the entire circumference of the nozzle ring 7 emerges completely uniformly from the nozzle ring. Rather, it is more expedient to apply more air to each of the sections of the nozzle ring provided between two grinding rollers than the sections adjacent to the grinding rollers, since the material to be ground passes between the grinding rollers over the grinding table edge. In addition to a homogenization of the gas flow in the annular space 9, it is provided according to a further embodiment of the invention, to apply certain portions of the nozzle ring with more or less sight gas. In the embodiment according to FIGS. 5a and 5b, the collar 20 is therefore provided with recesses 20a. The number of recesses corresponds expediently, the single or multiple multiples of the number of grinding rollers. 1
Im dargestellten Ausführungsbeispiel wäre der Kragen 20 mit seinen vier Aussparungen 20a daher insbesondere für eine Vertikalrollenmühle mit vier Mahlrollen 1 geeignet. Selbstverständlich müssen die Aussparungen 20a auf die Anordnung der Mahlrollen 1 abgestimmt sein, um die gewünschte Strömung des Sichtgases 8 zu erzeugen. In the illustrated embodiment, the collar 20 with its four recesses 20a would therefore be suitable in particular for a vertical roller mill with four grinding rollers 1. Of course, the recesses 20a must be matched to the arrangement of the grinding rollers 1 in order to produce the desired flow of the classifying gas 8.
Während die Aussparungen 20a die Form eines Kreisabschnitts haben, zeigt das Ausführungsbeispiel gemäß den Figuren 6a und 6b eine mehr eckige Form von Aussparungen 20b. Durch die Form und Anordnung der Aussparungen kann eine gezielte Beeinflussung des durch den Düsenring 7 hindurchtretenden Sichtgases 8 erreicht werden. Die Vergleichmäßigung im Ringraum 9 gewährleistet, dass die Strömungen im Bereich aller Aussparungen gleich bzw. annähernd gleich sind. Nimmt der Kragen die Form des horizontalen Ringblechs 22 ein, können natürlich auch dort entsprechende Aussparungen vorgesehen werden. While the recesses 20a have the shape of a circular section, the embodiment according to FIGS. 6a and 6b shows a polygonal shape of recesses 20b. Due to the shape and arrangement of the recesses, a targeted influencing of the passing through the nozzle ring 7 sighting gas 8 can be achieved. The homogenization in the annular space 9 ensures that the currents in the region of all recesses are equal or approximately equal. If the collar takes the shape of the horizontal ring plate 22, of course, corresponding recesses can also be provided there.
Anstelle von zwei Gaseinlässen 10, 11 können aber auch drei Gaseinlässe 10, 11, 12 vorgesehen werden, wie das in den Figuren 7a bis 7c dargestellt ist. In diesem Fall sind die drei Gaseinlässe gleichmäßig über den Umfang verteilt angeordnet und münden ebenfalls tangential in der gleichen Drehrichtung in den Ringraum ein. Zwischen jeweils zwei Gaseinlässen sind wiederum spiralförmige Wandungen 14, 15 und 16 vorgesehen. Bezüglich der sonstigen Ausgestaltung des Ringraums und insbesondere des Kragens 20 bzw. einer zylindrischen Wandung 21 in Kombination mit einem Ringblech 22 kann auf die obigen Ausführungen verwiesen werden. Instead of two gas inlets 10, 11 but also three gas inlets 10, 11, 12 may be provided, as shown in Figures 7a to 7c. In this case, the three gas inlets are distributed uniformly over the circumference and also open tangentially in the same direction of rotation in the annulus. Between each two gas inlets spiral walls 14, 15 and 16 are again provided. With regard to the other embodiment of the annular space and in particular of the collar 20 and a cylindrical wall 21 in combination with a ring plate 22 may be made to the above statements.
Das Ausführungsbeispiel gemäß den Figuren 8a und 8c zeigt schließlich noch eine Anordnung mit vier Gaseinlässen 10, 11, 12, 13 mit dazwischen angeordneten spiralförmigen Wandungen 14, 15, 16 und 17. Finally, the exemplary embodiment according to FIGS. 8a and 8c shows an arrangement with four gas inlets 10, 11, 12, 13 with helical walls 14, 15, 16 and 17 arranged therebetween.
Die oben beschriebenen Ausführungsbeispiele zeichnen sich durch eine saubere Anströmung des Düsenrings 7 mit einer drallbehafteten, zirkulären Strömung aus, wobei durch den Kragen 20 oder den sich ausbildenden Schüttkegel 23 eine Strömungsumkehr vor dem Düsenring vermieden wird. Auf diese Weise kann die Materialmenge, welche nicht vom Sichtgas 8 mitgerissen und stattdessen durch den Düsenring nach unten fällt, deutlich verringert werden. Bei den der Erfindung zugrundeliegenden Versuchen hat sich auch gezeigt, dass durch die erfindungsgemäße Anströmung des Düsenrings ein Einsaugen von Luft von oberhalb des Düsenrings vermieden wird. Auch hierdurch wird die Sichtung verbessert. Durch die Aussparungen im Kragen kann die Luftmengenverteilung im Düsenring flexibel an die Bedürf isse angepasst werden. Eine gleichmäßige Geschwindigkeitsverteilung über den gesamten Düsenring gewährleistet zudem auch bessere Anströmung des nach geordneten Sichters 4. The embodiments described above are characterized by a clean flow of the nozzle ring 7 with a swirling, circular flow, wherein a flow reversal in front of the nozzle ring is avoided by the collar 20 or the forming bulk cone 23. In this way, the amount of material that is not entrained by the classifying gas 8 and instead falls down through the nozzle ring, can be significantly reduced. In the experiments on which the invention is based, it has also been shown that sucking in air from above the nozzle ring is avoided by the flow according to the invention of the nozzle ring. This also improves the sighting. Due to the recesses in the collar, the air volume distribution in the nozzle ring can be adapted flexibly to the needs. A uniform velocity distribution over the entire nozzle ring also ensures better flow of the classified classifier. 4
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012107127.6A DE102012107127B4 (en) | 2012-08-03 | 2012-08-03 | Vertical roller mill |
| PCT/EP2013/064044 WO2014019794A2 (en) | 2012-08-03 | 2013-07-03 | Vertical roller mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2879798A2 true EP2879798A2 (en) | 2015-06-10 |
| EP2879798B1 EP2879798B1 (en) | 2016-09-07 |
Family
ID=48790394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13736839.5A Not-in-force EP2879798B1 (en) | 2012-08-03 | 2013-07-03 | Vertical roller mill |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2879798B1 (en) |
| DE (1) | DE102012107127B4 (en) |
| DK (1) | DK2879798T3 (en) |
| WO (1) | WO2014019794A2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4547400A1 (en) | 2023-09-21 | 2025-05-07 | thyssenkrupp Polysius GmbH | Vertical centrifugal roll mill |
| LU103197B1 (en) | 2023-09-21 | 2025-03-21 | Thyssenkrupp AG | Vertical roller mill |
| DE102023125678A1 (en) | 2023-09-21 | 2025-03-27 | Thyssenkrupp Ag | Vertical roller mill |
| WO2025231101A1 (en) * | 2024-05-02 | 2025-11-06 | Maag Reduction, Inc. | Mill housings for pulverizer systems |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT122554B (en) * | 1929-01-07 | 1931-04-25 | Ernst Curt Loesche | Mill. |
| GB313845A (en) * | 1929-01-07 | 1929-06-20 | Ernst Curt Loesche | Improvements in or relating to crushing mills |
| DE828192C (en) | 1948-10-02 | 1952-01-17 | Babcock & Wilcox Dampfkessel W | Ball ring mill |
| DE852646C (en) * | 1949-10-23 | 1952-10-16 | Babcock & Wilcox Dampfkessel W | Ball ring mill |
| US4522343A (en) * | 1982-12-13 | 1985-06-11 | Williams Patent Crusher And Pulverizer Company | Micronized grinding apparatus |
| DE3717976A1 (en) | 1987-05-27 | 1988-12-08 | Krupp Polysius Ag | METHOD AND SYSTEM FOR CRUSHING GROUND MATERIAL |
| GB2214106B (en) | 1987-12-24 | 1991-06-26 | Smidth & Co As F L | Vertical roller mill |
| DE3839419A1 (en) | 1988-11-22 | 1990-05-23 | Krupp Polysius Ag | DEVICE FOR FEEDING MATERIAL INTO A PLANT PART |
| US7252253B2 (en) * | 2003-05-13 | 2007-08-07 | Bharat Heavy Electricals Ltd. | Bowl mill for a coal pulverizer with an air mill for primary entry of air |
| CN201807409U (en) | 2010-09-29 | 2011-04-27 | 莱歇研磨机械制造(上海)有限公司 | Polygonal adjustable air ring for roller type mill |
-
2012
- 2012-08-03 DE DE102012107127.6A patent/DE102012107127B4/en not_active Expired - Fee Related
-
2013
- 2013-07-03 EP EP13736839.5A patent/EP2879798B1/en not_active Not-in-force
- 2013-07-03 DK DK13736839.5T patent/DK2879798T3/en active
- 2013-07-03 WO PCT/EP2013/064044 patent/WO2014019794A2/en not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014019794A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012107127A1 (en) | 2014-02-06 |
| WO2014019794A2 (en) | 2014-02-06 |
| WO2014019794A3 (en) | 2014-04-03 |
| DE102012107127B4 (en) | 2017-08-17 |
| EP2879798B1 (en) | 2016-09-07 |
| DK2879798T3 (en) | 2017-01-02 |
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