EP0166139B1 - Vertical mill, especially a roller mill for crushing coal - Google Patents

Vertical mill, especially a roller mill for crushing coal Download PDF

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Publication number
EP0166139B1
EP0166139B1 EP85105688A EP85105688A EP0166139B1 EP 0166139 B1 EP0166139 B1 EP 0166139B1 EP 85105688 A EP85105688 A EP 85105688A EP 85105688 A EP85105688 A EP 85105688A EP 0166139 B1 EP0166139 B1 EP 0166139B1
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EP
European Patent Office
Prior art keywords
nozzle
segments
ring
vertical mill
protective
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EP85105688A
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German (de)
French (fr)
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EP0166139A3 (en
EP0166139A2 (en
Inventor
Hellmut Dipl.-Ing. Galter
Reiner Dipl.-Ing. Frühling
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Claudius Peters AG
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Claudius Peters AG
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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
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface

Definitions

  • the invention relates to a vertical mill, in particular a roller mill for coal grinding, with two grinding rings or bowls arranged one above the other, one of which is fixed in the direction of rotation and of which the other can be rotated by a motor, with grinding rollers running between the grinding rings for comminuting the ground material or -balls, and with a nozzle ring arranged around the lower grinding ring, through which a gas can be blown from below into the area of the grinding rollers, the nozzle ring consisting of a plurality of circumferentially adjacent nozzle segments, in which the nozzle channels on three sides through parts of the Nozzle segments are limited and open towards the lower grinding ring (US-A-2 545 254).
  • the regrind is fed onto the lower grinding ring from the inside.
  • This lower grinding ring can be rotatable and can be provided with a corresponding motor drive, while the upper grinding ring is fixed in the circumferential direction.
  • this upper grinding ring is spring-loaded in the direction of the lower grinding ring, so that the upper grinding ring can yield when the grinding rollers or balls are pressed upwards by the grinding material underneath.
  • the lower grinding ring is fixed in the circumferential direction, while the upper grinding ring is rotated by means of a motor.
  • the comminuted ground material is exposed to the upward gas stream, in particular an air stream, from the nozzle ring.
  • the lighter fraction of the comminuted material is transported upwards and fed to a sifter, with the aid of which sufficiently small particles are removed, while not yet comminuted particles are fed back to the vertical mill. Heavier particles remain suspended in the gas flow generated by the nozzle ring and thus get back into the area of the grinding rollers or balls.
  • the gas flow is often also guided in the circumferential direction in order to achieve a helical movement of the air flow and the ground material.
  • the gas stream, in particular air stream can also serve to dry the ground material; for this purpose, in particular the air flow can be heated.
  • the correct speed of the air passing through the nozzle ring is critical for proper functioning. If this speed is too high, even heavier particles are transported into the classifier, which can overload it. It also wastes energy. However, if the speed of the air flow is too low, the heavier particles fall through the nozzle ring and gradually clog the air supply ducts.
  • the air speed is dependent on the nozzle size with a constant supply of air per unit of time.
  • the disadvantage that the coarse material falls through is usually eliminated by either closing some nozzles or by reducing the size of the nozzles by appropriate covers. If the air velocity when passing through the nozzles is too high due to the nozzle size being too small, the entire nozzle ring must be exchanged for one with larger nozzles.
  • the regrind bed which is loosened by the air flow, rotates constantly and is in the vortex state outside the grinding rings, that is, between the grinding balls or rollers and the mill housing. This area above the nozzle ring is particularly exposed to wear.
  • the object of the invention is to provide a nozzle ring of the type mentioned, in which the nozzle size can be easily adjusted and adjusted with simple means and in which relatively small wear parts can be easily replaced.
  • the solution according to the invention is that the nozzle segments are displaceable in the radial direction, can be fastened to a support ring at different distances from the lower grinding ring, and that the nozzle ring has protective segments for covering the fastening devices of the nozzle segments, which have the same length in the circumferential direction as the nozzle segments.
  • the nozzle ring thus consists of several nozzle segments, so that individual nozzle segments that are exposed to excessive wear can be replaced without having to replace the entire nozzle ring.
  • the nozzle channels are delimited on three sides by the nozzle segments; on the fourth side they are delimited by the lower grinding ring. If the nozzle segments are now moved in the radial direction, the size of the nozzle, which is defined by the channel of the nozzle segment and the grinding ring, is increased or decreased, so that this nozzle size is set very precisely even if the nozzle segments themselves are not precision parts, are about poured.
  • the nozzle channels open to the side of the grinding ring can advantageously be formed in that the nozzle segments have a blade part which extends essentially in the circumferential direction and at least one blade which extends in the direction of the lower grinding ring and is inclined in the circumferential direction.
  • the desired swirl of the air emerging from the nozzles is achieved by the inclination of the blade.
  • a channel is then formed between a blade of one nozzle segment and the next blade of the adjacent nozzle segment.
  • the nozzle segments can be fastened in a particularly advantageous manner in a radially displaceable manner if they can be fastened to the supporting ring with strips which are held by screws which extend through holes in the radial direction of the nozzle segment. In this way, the nozzle segment is clamped between the strip fastened with screws and the support ring.
  • a hole for attaching a protective segment with a screw is advantageously provided on each bar, which acts on a fork plate of the protective segment.
  • the protective segment not only overlaps the fastening device for the nozzle segment, but also its own fastening screw and thus protects it from wear.
  • This fastening screw for the protective segment can be tightened as long as the neighboring protective segment has not yet been installed. The last protective segment can then be fastened with a stitching.
  • the wear of the protective segments is particularly small if they have a roof surface that rises from inside to outside.
  • the passage of false air through the nozzle ring is further reduced if the space between the support ring and the protective segments can be filled with insulating material, in particular insulating concrete.
  • the nozzle ring according to the invention is arranged between the mill wall, which is indicated at 1, and the lower grinding bowl 2, which can be rotated in this embodiment.
  • the nozzle ring according to the invention is attached to a support ring 3 which is attached to the mill wall 1.
  • blades 17 are attached, which extend from the blade part 6 to the vicinity of the grinding bowl 2. These blades are inclined at an angle to cause the air flowing through them to swirl. In the embodiment shown, two such blades are provided per nozzle segment 4. The boundaries of the blade parts lying at the front and rear in the circumferential direction also have an inclination which corresponds to the inclination of the blades 17, as is the case, can be clearly seen in Fig. 2.
  • the nozzle channels are delimited by a part of the blade part 6, two adjacent blades 17 (possibly adjacent nozzle segments 4) and the grinding bowl 2.
  • the nozzle segments 4 are fastened by means of the fastening part 7, which for this purpose has two elongate recesses 8 which are open radially outwards, by means of the screws 9 extend into threaded bores 10 of the support ring 3.
  • the screws 9 engage a strip 11, the fastening part 7 being clamped between the strip 11 and the support ring 3.
  • the screws 9 are still secured by a locking plate 12 against loosening.
  • the fastening devices with which the nozzle segments 4 can be fastened in different radial positions are protected against wear by the protective segments 5.
  • These protective segments 5 have a fork plate 13 with which they can be fastened on the fastening part 7 of a nozzle segment 4 with the aid of a screw 14 and a washers 15.
  • the screw 14 is screwed into a corresponding threaded hole in the strip 11. How this z. 1, the protective segments 5 are offset in the circumferential direction relative to the nozzle segments 4, so that the gaps between the nozzle segments are at least partially covered.
  • the space between the support ring 3 and the protective segment 5 can still be covered with an insulating compound, for. B. Insulated concrete can be filled, as indicated in Fig. 3 at 16.

Description

Die Erfindung betrifft eine Vertikalmühle, insbesondere Wälzmühle für Kohlevermahlung, mit zwei übereinander angeordneten Mahlringen oder -schüsseln, von denen einer in Umlaufrichtung feststeht und von denen der andere von einem Motor in Drehbewegung versetzbar ist, mit zwischen den Mahlringen zur Zerkleinerung des Mahlgutes ablaufenden Mahlwalzen oder -kugeln, und mit einem um den unteren Mahlring herum angeordneten Düsenring, durch den ein Gas von unten in den Bereich der Mahlwalzen hineinblasbar ist, wobei der Düsenring aus mehreren in Umfangsrichtung aneinander anschließenden Düsensegmenten besteht, bei denen die Düsekanäle an drei Seiten durch Teile der Düsensegmente bergrenzt und zum unteren Mahlring hin offen sind, (US-A-2 545 254).The invention relates to a vertical mill, in particular a roller mill for coal grinding, with two grinding rings or bowls arranged one above the other, one of which is fixed in the direction of rotation and of which the other can be rotated by a motor, with grinding rollers running between the grinding rings for comminuting the ground material or -balls, and with a nozzle ring arranged around the lower grinding ring, through which a gas can be blown from below into the area of the grinding rollers, the nozzle ring consisting of a plurality of circumferentially adjacent nozzle segments, in which the nozzle channels on three sides through parts of the Nozzle segments are limited and open towards the lower grinding ring (US-A-2 545 254).

Bei Vertikalmühlen dieser Art wird das Mahlgut von innen auf den unteren Mahlring aufgegeben. Dieser untere Mahlring kann dabei rotierbar sein und mit einem entsprechenden motorischen Antrieb versehen sein, während der obere Mahlring in Umfangsrichtung feststeht. Dieser obere Mahlring ist aber in Richtung auf den unteren Mahlring federbelastet, so daß der obere Mahlring nachgeben kann, wenn die Mahlwalzen oder -kugeln durch darunter liegendes Mahlgut nach oben gedrückt werden. Bei einer ähnlichen Anordnung steht der untere Mahlring in Umfangsrichtung fest, während der obere Mahlring mit Hilfe eines Motors gedreht wird.In vertical mills of this type, the regrind is fed onto the lower grinding ring from the inside. This lower grinding ring can be rotatable and can be provided with a corresponding motor drive, while the upper grinding ring is fixed in the circumferential direction. However, this upper grinding ring is spring-loaded in the direction of the lower grinding ring, so that the upper grinding ring can yield when the grinding rollers or balls are pressed upwards by the grinding material underneath. In a similar arrangement, the lower grinding ring is fixed in the circumferential direction, while the upper grinding ring is rotated by means of a motor.

Das zerkleinerte Mahlgut wird dem nach oben gerichteten Gasstrom, insbesondere einem Luftstrom, aus dem Düsenring ausgesetzt. Dabei wird die leichtere Fraktion des zerkleinerten Gutes nach oben transportiert und einem Sichter zugeführt, mit Hilfe dessen ausreichend klein gemahlene Teilchen weggeführt werden, während noch nicht genügend zerkleinerte Teilchen der Vertikalmühle wieder zugeführt werden. Schwerere Teilchen bleiben im durch den Düsenring erzeugten Gasstrom schweben und gelangen so wieder in den Bereich der Mahlwalzen oder -kugeln. Dabei ist der Gasstrom häufig auch noch in Umfangsrichtung gelenkt, um eine schraubenförmige Bewegung des Luftstromes und des Mahlgutes zu erreichen. Der Gasstrom, insbesondere Luftstrom kann auch noch der Trocknung des Mahlgutes dienen; zu diesem Zweck kann insbesondere der Luftstrom erwärmt sein.The comminuted ground material is exposed to the upward gas stream, in particular an air stream, from the nozzle ring. The lighter fraction of the comminuted material is transported upwards and fed to a sifter, with the aid of which sufficiently small particles are removed, while not yet comminuted particles are fed back to the vertical mill. Heavier particles remain suspended in the gas flow generated by the nozzle ring and thus get back into the area of the grinding rollers or balls. The gas flow is often also guided in the circumferential direction in order to achieve a helical movement of the air flow and the ground material. The gas stream, in particular air stream, can also serve to dry the ground material; for this purpose, in particular the air flow can be heated.

Kritisch ist für eine einwandfreie Funktionsweise die richtige Geschwindigkeit der durch den Düsenring tretenden Luft. Ist diese Geschwindigkeit nämlich zu groß, so werden auch schwerere Teilchen in den Sichter befördert, wodurch dieser überlastet werden kann. Außerdem wird auf diese Weise Energie verschwendet. Ist die Geschwindigkeit des Luftstromes aber zu gering, so fallen die schwereren Teilchen durch den Düsenring hindurch und verstopfen allmählich die Zuleitungskanäle für die Luft.The correct speed of the air passing through the nozzle ring is critical for proper functioning. If this speed is too high, even heavier particles are transported into the classifier, which can overload it. It also wastes energy. However, if the speed of the air flow is too low, the heavier particles fall through the nozzle ring and gradually clog the air supply ducts.

Die Luftgeschwindigkeit ist bei konstanter zugeführter Luftmenge pro Zeiteinheit von der Düsengröße abhängig.The air speed is dependent on the nozzle size with a constant supply of air per unit of time.

Ist wegen zu großem Düsenquerschnitt die Luftgeschwindigkeit zu klein, so versucht man den Nachteil, daß das Grobgut nach unten durchfällt, meist dadurch zu beseitigen, daß entweder einige Düsen geschlossen werden oder aber daß alle Düsen durch entsprechende Abdeckungen verkleinert werden. Ist die Luftgeschwindigkeit beim Durchtritt durch die Düsen wegen zu kleiner Düsengröße zu groß, so muß der gesamte Düsenring gegen einen solchen mit größeren Düsen ausgetauscht werden.If the air speed is too low due to the nozzle cross-section being too large, the disadvantage that the coarse material falls through is usually eliminated by either closing some nozzles or by reducing the size of the nozzles by appropriate covers. If the air velocity when passing through the nozzles is too high due to the nozzle size being too small, the entire nozzle ring must be exchanged for one with larger nozzles.

Das Mahlgutbett, das durch den Luftstrom aufgelockert wird, rotiert ständig und befindet sich außerhalb der Mahlringe im Wirbelzustand, das heißt zwischen den Mahlkugeln oder -walzen und dem Mühlengehäuse. Damit ist dieser Bereich oberhalb des Düsenringes in besonders starkem Maße dem Verschleiß ausgesetzt.The regrind bed, which is loosened by the air flow, rotates constantly and is in the vortex state outside the grinding rings, that is, between the grinding balls or rollers and the mill housing. This area above the nozzle ring is particularly exposed to wear.

Die Aufgabe der Erfindung besteht darin, einen Düsenring der eingangs genannten Art zu schaffen, bei dem mit einfachen Mitteln die Düsengröße leicht eingestellt und verstellt werden kann und bei dem verhältnismäßig kleine Verschleißteile einfach ausgewechselt werden können.The object of the invention is to provide a nozzle ring of the type mentioned, in which the nozzle size can be easily adjusted and adjusted with simple means and in which relatively small wear parts can be easily replaced.

Die erfindungsgemäße Lösung besteht darin, daß die Düsensegmente in Radialrichtung verschiebbar, an einem Tragring in unterschiedlichem Abstand zum unteren Mahlring befestigbar sind, und daß der Düsenring Schutzsegmente zum Abdecken der Befestigungseinrichtungen der Düsensegmente aufweist, die die gleiche Länge in Umfangsrichtung wie die Düsensegmente haben.The solution according to the invention is that the nozzle segments are displaceable in the radial direction, can be fastened to a support ring at different distances from the lower grinding ring, and that the nozzle ring has protective segments for covering the fastening devices of the nozzle segments, which have the same length in the circumferential direction as the nozzle segments.

Der Düsenring besteht also aus mehreren Düsensegmenten, so daß einzelne zu stark dem Verschleiß ausgesetzte Düsensegmente ausgetauscht werden können, ohne daß gleich der ganze Düsenring ausgetauscht werden muß. Die Düsenkanäle sind an drei Seiten durch die Düsensegmente begrenzt; an der vierten Seite sind sie durch den unteren Mahlring begrenzt. Werden nun die Düsensegmente in Radialrichtung bewegt, so wird die Größe der Düse, die durch den Kanal des Düsensegments und den Mahlring definiert wird, vergrößert oder verkleinert, so daß diese Düsengröße auch dann sehr genau eingestellt ist, wenn die Düsensegmente selbst keine Präzisionsteile sind, also etwa gegossen sind.The nozzle ring thus consists of several nozzle segments, so that individual nozzle segments that are exposed to excessive wear can be replaced without having to replace the entire nozzle ring. The nozzle channels are delimited on three sides by the nozzle segments; on the fourth side they are delimited by the lower grinding ring. If the nozzle segments are now moved in the radial direction, the size of the nozzle, which is defined by the channel of the nozzle segment and the grinding ring, is increased or decreased, so that this nozzle size is set very precisely even if the nozzle segments themselves are not precision parts, are about poured.

Durch die radiale Verschiebbarkeit der Düsensegmente kann zwar der Düsenquerschnitt verändert werden. Erstaunlicherweise kann man dabei durchaus in Kauf nehmen, daß sich der Ringspalt zwischen dem unteren Mahlring und den diesem benachbarten Teilen der Düsensegmente (den Düsenschaufeln) ändert. Dies hat nämlich innerhalb ziemlich weiter Grenzen keine weiteren Nachteile. Die radiale Verschiebbarkeit hat noch den weiteren Vorteil, daß Ungenauigkeiten zwischen Mühlengehäuse und unterem Mahlring, das heißt Differenzen im radialen Abstand, auf einfache Art und Weise so ausgeglichen werden können, daß der Ringspalt klein und der Düsenquerschnitt auf dem gesamten Umfang glichbleibend eingestellt werden können.The nozzle cross section can be changed due to the radial displaceability of the nozzle segments. Surprisingly, it can be accepted that the annular gap between the lower grinding ring and the adjacent parts of the nozzle segments (the nozzle blades) changes. This has no further disadvantages within fairly wide limits. The radial displaceability has the further advantage that inaccuracies between the mill housing and the lower grinding ring, that is to say differences in the radial distance, can be compensated in a simple manner in such a way that the annular gap can be set small and the nozzle cross section can be set to be the same over the entire circumference.

Die Befestigungseinrichtungen, mit denen die Düsensegmente in unterschiedlicher radialer Stellung befestigt werden können, sind durch die Schutzsegmente vor Abnutzung geschützt. Auch diese Schutzsegmente können einzeln ausgewechselt werden, wenn sie zu stark abgenutzt sind.The fastening devices with which the nozzle segments can be fastened in different radial positions are protected against wear by the protective segments. These protection segments can also be replaced individually if they are excessively worn.

Zwischen den einzelnen Düsensegmenten verbleibt meistens ein Spalt, durch den Falschluft hindurchtreten könnte. Um diese Probleme zu verringern ist vorteilhafterweise vorgesehen, daß die Schutzsegmente in Umfangsrichtung zu den Düsensegmenten versetzt angeordnet sind, wodurch dieser Spalt wenigstens im Bereich der Schutzsegmente abgedeckt ist.There is usually a gap between the individual nozzle segments through which the wrong air could pass. In order to reduce these problems, it is advantageously provided that the protective segments are offset in the circumferential direction from the nozzle segments, as a result of which this gap is covered at least in the region of the protective segments.

Die zur Seite des Mahlringes offenen Düsenkanäle können vorteilhafterweise dadurch gebildet werden, daß die Düsensegmente einen im wesentlichen sich in Umfangsrichtung erstreckenden Schaufelteil und mindestens eine sich von diesem in Richtung zum unteren Mahlring erstreckende, zur Umfangsrichtung geneigte Schaufel aufweisen. Durch die Neigung der Schaufel wird dabei der gewünschte Drall der aus den Düsen austretenden Luft erreicht. Ein Kanal wird dann jeweils zwischen einer Schaufel eines Düsensegmentes und der nächsten Schaufel des benachbarten Düsensegmentes gebildet. Besonders vorteilhaft hat es sich aber erwiesen, wenn pro Düsensegment zwei Schaufeln vorgesehen sind, wobei ein Kanal zwischen diesen beiden Schaufeln und je ein weiterer Kanal auf der Außenseite dieser Schaufeln in Zusammenwirkung mit einer Schaufel eines benachbarten Düsensegmentes gebildet wird.The nozzle channels open to the side of the grinding ring can advantageously be formed in that the nozzle segments have a blade part which extends essentially in the circumferential direction and at least one blade which extends in the direction of the lower grinding ring and is inclined in the circumferential direction. The desired swirl of the air emerging from the nozzles is achieved by the inclination of the blade. A channel is then formed between a blade of one nozzle segment and the next blade of the adjacent nozzle segment. However, it has proven to be particularly advantageous if two blades are provided per nozzle segment, a channel being formed between these two blades and a further channel on the outside of these blades in cooperation with a blade of an adjacent nozzle segment.

Die Düsensegmente können auf besonders vorteilhafte Weise radial verschiebbar befestigt werden, wenn sie mit Leisten am Tragring befestigbar sind, die mit durch in Radialrichtung längliche Bohrungen des Düsensegments hindurchreichenden Schrauben gehalten sind. Auf diese Weise wird das Düsensegment zwischen der mit Schrauben befestigten Leiste und dem Tragring eingeklemmt.The nozzle segments can be fastened in a particularly advantageous manner in a radially displaceable manner if they can be fastened to the supporting ring with strips which are held by screws which extend through holes in the radial direction of the nozzle segment. In this way, the nozzle segment is clamped between the strip fastened with screws and the support ring.

An jeder Leiste ist dabei vorteilhafterweise eine Bohrung zum Befestigen eines Schutzsegmentes mit einer Schraube vorgesehen, die an einer Gabellasche des Schutzsegments angreift. Dabei übergreift das Schutzsegment nicht nur die Befestigungseinrichtung für das Düsensegment, sondern auch seine eigene Befestigungsschraube und schützt sie so vor Abnutzung. Dieser Befestigungsschraube für das Schutzsegment kann dabei, solange wie das benachbarte Schutzsegment noch nicht eingebaut ist, angezogen werden. Das letzte Schutzsegment kann dann mit einer Heftnaht befestigt werden.A hole for attaching a protective segment with a screw is advantageously provided on each bar, which acts on a fork plate of the protective segment. The protective segment not only overlaps the fastening device for the nozzle segment, but also its own fastening screw and thus protects it from wear. This fastening screw for the protective segment can be tightened as long as the neighboring protective segment has not yet been installed. The last protective segment can then be fastened with a stitching.

Die Abnutzung der Schutzsegmente ist besonders klein, wenn sie eine dachförmig von innen nach außen ansteigende obere Oberfläche haben.The wear of the protective segments is particularly small if they have a roof surface that rises from inside to outside.

Das Durchtreten von Falschluft durch den Düsenring wird weiter vermindert, wenn der Raum zwischen dem Tragring und den Schutzsegmenten mit Isoliermaterial, insbesondere Isolierbeton verfüllbar ist.The passage of false air through the nozzle ring is further reduced if the space between the support ring and the protective segments can be filled with insulating material, in particular insulating concrete.

Die Erfindung wird im folgenden beispielsweise unter Bezugnahme auf die beigefügten Zeichnungen anhand von vorteilhaften Ausführungsformen beschrieben. Es zeigen:

  • Fig. 1 in Draufsicht einen Teil des erfindungsgemäßen Düsenringes;
  • Fig. 2 in Seitenansicht einen Teil des Düsenringes, gesehen vom Mittelpunkt des Düsenringes her, und zwar teilweise im Schnitt; und
  • Fig. 3 eine vereinfachte Schnittansicht entlang der Linie 111-111 von Fig. 2.
The invention is described below, for example with reference to the accompanying drawings using advantageous embodiments. Show it:
  • Figure 1 is a plan view of part of the nozzle ring according to the invention.
  • Figure 2 is a side view of part of the nozzle ring, seen from the center of the nozzle ring, partly in section. and
  • 3 is a simplified sectional view taken along line 111-111 of FIG. 2.

Wie dies in Fig. 3 dargestellt ist, ist der erfindungsgemäße Düsenring zwischen der Mühlenwand, die bei 1 angedeutet ist, und der unteren, bei dieser Ausführungsform drehbaren Mahlschüssel 2 angeordnet. Der erfindungsgemäße Düsenring ist dabei an einem Tragring 3 befestigt, der an der Mühlenwand 1 befestigt ist.As shown in FIG. 3, the nozzle ring according to the invention is arranged between the mill wall, which is indicated at 1, and the lower grinding bowl 2, which can be rotated in this embodiment. The nozzle ring according to the invention is attached to a support ring 3 which is attached to the mill wall 1.

Der Düsenring besteht aus Düsensegmenten 4 und Schutzsegmenten 5. Die Düsensegmente 4 erstrecken sich dabei in Radialrichtung mit einem dem Rand der Mahlschüssel 2 gegenüberstehenden Schaufelteil 6 und einem im wesentlichen dazu senkrechten Befestigungsteil 7, der auf der Tragleiste 3 aufliegt. Dabei hat der Schaufelteil 6 eine solche Form, die den gewünschten Düseneigenschaften entspricht; bei der Darstellung der Fig. 3 verengt sich der Düsenquerschnitt zwischen der Schaufelwand 6 und der Mahlschüssel 2 z.B. von unten nach oben.The nozzle ring consists of nozzle segments 4 and protective segments 5. The nozzle segments 4 extend in the radial direction with a blade part 6 opposite the edge of the grinding bowl 2 and an essentially perpendicular fastening part 7 which rests on the support bar 3. The blade part 6 has a shape which corresponds to the desired nozzle properties; 3 the nozzle cross-section between the blade wall 6 and the grinding bowl 2 is narrowed e.g. from the bottom up.

Am Schaufelteil 6 sind Schaufeln 17 angebracht, die sich vom Schaufelteil 6 bis in die Nähe der Mahlschüssel 2 erstrecken. Diese Schaufeln sind schräg geneigt, um eine Drallbewegung der durchströmenden Luft zu bewirken. Bei der gezeigten Ausführungsform sind zwei solcher Schaufeln pro Düsensegment 4 vorgesehen. Auch die in Umfangsrichtung vorne und hinten liegenden Begrenzungen der Schaufelteile haben dabei eine Neigung, die der Neigung der Schaufeln 17 entspricht, wie dies z.B. in Fig. 2 deutlich zu sehen ist. Die Düsenkanäle werden dabei durch einen Teil des Schaufelteils 6, zwei benachbarte Schaufeln 17 (möglicherweise an einander angrenzenden Düsensegmenten 4) und die Mahlschüssel 2 begrenzt.On the blade part 6, blades 17 are attached, which extend from the blade part 6 to the vicinity of the grinding bowl 2. These blades are inclined at an angle to cause the air flowing through them to swirl. In the embodiment shown, two such blades are provided per nozzle segment 4. The boundaries of the blade parts lying at the front and rear in the circumferential direction also have an inclination which corresponds to the inclination of the blades 17, as is the case, can be clearly seen in Fig. 2. The nozzle channels are delimited by a part of the blade part 6, two adjacent blades 17 (possibly adjacent nozzle segments 4) and the grinding bowl 2.

Die Düsensegmente 4 sind mit Hilfe des Befstigungsteiles 7 befestigt, der zu diesem Zweck zwei radial nach außen offene längliche Ausnehmungen 8 aufweist, durch die Schrauben 9 in Gewindebohrungen 10 des Tragringes 3 hineinreichen. Die Schrauben 9 greifen dabei an einer Leiste 11 an, wobei der Befestigungsteil 7 zwischen der Leiste 11 und dem Tragring 3 eingeklemmt wird. Die Schrauben 9 sind dabei noch durch ein Sicherungsbleck 12 gegen Losewerden gesichert.The nozzle segments 4 are fastened by means of the fastening part 7, which for this purpose has two elongate recesses 8 which are open radially outwards, by means of the screws 9 extend into threaded bores 10 of the support ring 3. The screws 9 engage a strip 11, the fastening part 7 being clamped between the strip 11 and the support ring 3. The screws 9 are still secured by a locking plate 12 against loosening.

Die Befestigungseinrichtungen, mit denen die Düsensegmente 4 in verschiedenen radialen Stellungen befestigt werden können, sind durch die Schutzsegmente 5 gegen Abnutzung geschützt. Diese Schutzsegmente 5 weisen eine Gabellasche 13 auf, mit der sie mit Hilfe einer Schraube 14 und einer Unterlegscheiben 15 auf dem Befestigungsteil 7 eines Düsensegments 4 befestigt werden können. Zu diesem Zweck wird die Schraube 14 in eine entsprechende mit Gewinde versehene Bohrung in der Leiste 11 eingeschraubt. Wie dies z. B. aus Fig. 1 ersichtlich ist, sind dabei die Schutzsegmente 5 relativ zu den Düsensegmenten 4 in Umfangsrichtung versetzt angeordnet, so daß die Spalten zwischen den Düsensegmenten wenigstens teilweise abgedeckt werden.The fastening devices with which the nozzle segments 4 can be fastened in different radial positions are protected against wear by the protective segments 5. These protective segments 5 have a fork plate 13 with which they can be fastened on the fastening part 7 of a nozzle segment 4 with the aid of a screw 14 and a washers 15. For this purpose, the screw 14 is screwed into a corresponding threaded hole in the strip 11. How this z. 1, the protective segments 5 are offset in the circumferential direction relative to the nozzle segments 4, so that the gaps between the nozzle segments are at least partially covered.

Der Raum zwischen Tragring 3 und Schutzsegment 5 kann noch mit einer Isoliermasse, z. B. Isolierbeton gefüllt sein, wie dies in Fig. 3 bei 16 angedeutet ist.The space between the support ring 3 and the protective segment 5 can still be covered with an insulating compound, for. B. Insulated concrete can be filled, as indicated in Fig. 3 at 16.

Claims (8)

1. A vertical mill, in particular a roller mill for crushing coal, with two crushing rings or bowls arranged one above the other, one of which is non-rotational and the other one of which can be rotated by a motor, with crushing rollers or balls running between the crushing rings so as to comminute the material being crushed and with a nozzle ring which is arranged around the lower crushing ring (2) and through which a gas can be blown from below into the region of the crushing rollers, the nozzle ring comprising a plurality of peripherally spaced nozzle segments (4), in which the nozzle ducts are bounded on three sides by parts of the nozzle segments (6, 17) and are open towards the lower crushing ring (2), characterised in that the nozzle segments (4), which are displaceable in the radial direction, can be secured to a support ring (3) at different spacings from the lower crushing ring (2), and in that it has protective segments (5) to cover the securing means (9 to 12) for the nozzle segments (4), which are of the same length as the nozzle segments (4) in the peripheral direction.
2. A vertical mill according to claim 1, characterised in that the protective segments (5) are disposed offset relative to the nozzle segments (4) in the peripheral direction.
3. A vertical mill according to claim 1 or 2, characterised in that the nozzle segments (4) have a blade part (6) extending substantially in the peripheral direction with at least one blade (17) extending from the latter towards the lower crushing ring (2) and inclined towards the peripheral direction.
4. A vertical mill according to claim 3, characterised in that each nozzle segment (4) has two blades (17).
5. A vertical mill according to any one of claims 1 to 4, characterised in that the nozzle segments (4) are secured to the supporting ring (3) with fillets (11) which are retained by screws (9) passing through radially elongate bores (8) of the nozzle segment (4)
6. A vertical mill according to claim 5, characterised in that each fillet (11) has a bore for securing a protective segment (5) with a screw (14) which engages on a forked strap (13) of the protective segment (5).
7. A vertical mill according to any one of claims 1 to 6, characterised in that the protective segments (5) have an upper surface rising radially from the interior towards the exterior.
8. A vertical mill according to any one of claims 1 to 7, characterised in that the space between the support ring (3) and the protective segments (5) is filled with insulating material (16), in particular insulating concrete.
EP85105688A 1984-06-25 1985-05-09 Vertical mill, especially a roller mill for crushing coal Expired EP0166139B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3423412 1984-06-25
DE3423412A DE3423412A1 (en) 1984-06-25 1984-06-25 VERTICAL MILL, ESPECIALLY GRINDING MILL FOR COAL GRINDING

Publications (3)

Publication Number Publication Date
EP0166139A2 EP0166139A2 (en) 1986-01-02
EP0166139A3 EP0166139A3 (en) 1986-06-04
EP0166139B1 true EP0166139B1 (en) 1988-08-10

Family

ID=6239106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105688A Expired EP0166139B1 (en) 1984-06-25 1985-05-09 Vertical mill, especially a roller mill for crushing coal

Country Status (4)

Country Link
EP (1) EP0166139B1 (en)
DE (2) DE3423412A1 (en)
DK (1) DK284185A (en)
ES (1) ES8607051A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN105498910A (en) * 2016-01-16 2016-04-20 广西辉煌机械股份有限公司 Grinding roller protecting sleeve of vertical grinder

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605247B1 (en) * 1986-10-15 1988-12-02 Stein Industrie DEVICE FOR CHANNELING THE VERTICAL AIR FLOW ON THE PERIPHERY OF A ROTARY TANK OF A CRUSHER WITH VERTICAL AXIS ROLLERS
US5340041A (en) * 1992-11-25 1994-08-23 The Babcock & Wilcox Company Welded rotating annular passage segment for coal pulverizers with replaceable vanes and adjustable passage port area
DE19844112A1 (en) * 1998-09-25 2000-03-30 Loesche Gmbh Bucket ring for airflow roller mills
US6874715B1 (en) * 2000-10-27 2005-04-05 The Babcock & Wilcox Company EL type pulverizers
US9399222B2 (en) 2013-06-03 2016-07-26 Alstom Technology Ltd Air flow control arrangement for pulverizer

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Publication number Priority date Publication date Assignee Title
US2545254A (en) * 1945-06-20 1951-03-13 Babcock & Wilcox Co Air swept pulverizer having an eccentrically arranged air throat flow area
BE649901A (en) * 1963-06-28
US3511445A (en) * 1968-04-05 1970-05-12 Ronald A Ashdown Air flow control means for pulverizing mill
EP0027681B1 (en) * 1979-10-18 1984-02-15 F.L. Smidth & Co. A/S Nozzle ring assembly for a roller mill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105498910A (en) * 2016-01-16 2016-04-20 广西辉煌机械股份有限公司 Grinding roller protecting sleeve of vertical grinder

Also Published As

Publication number Publication date
DE3423412A1 (en) 1986-01-02
DK284185A (en) 1985-12-26
DE3564198D1 (en) 1988-09-15
DK284185D0 (en) 1985-06-24
ES8607051A1 (en) 1986-06-01
ES542881A0 (en) 1986-06-01
EP0166139A3 (en) 1986-06-04
EP0166139A2 (en) 1986-01-02

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