EP0325770B1 - Grinding method and arrangement - Google Patents
Grinding method and arrangement Download PDFInfo
- Publication number
- EP0325770B1 EP0325770B1 EP88121321A EP88121321A EP0325770B1 EP 0325770 B1 EP0325770 B1 EP 0325770B1 EP 88121321 A EP88121321 A EP 88121321A EP 88121321 A EP88121321 A EP 88121321A EP 0325770 B1 EP0325770 B1 EP 0325770B1
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- European Patent Office
- Prior art keywords
- grinding
- ring
- air stream
- elevated
- air
- 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.)
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
Definitions
- the invention relates to a grinding process (according to the preamble of claim 1) and a grinding plant (according to the preamble of claim 5).
- Ring mills are known in particular in the form of roller bowl mills, roller mills or ball ring mills.
- the grinding tools designed as rollers, rollers or balls roll on an annular grinding plate, the grinding pressure being generated by spring force, hydraulic cylinders, by centrifugal force or by the weight of the grinding tools.
- an air stream is fed through a nozzle ring which is arranged in a fixed manner on the outer circumference of the grinding plate and which detects and carries up the fine constituents of the comminuted ground material discharged over the edge of the grinding plate, while carrying the coarse constituents downward against the air flow through the nozzle ring fall and, for example, are re-fed to the mill via a mechanical conveyor.
- the grinding material is also comminuted using the known design according to DE-A-3 443 808, but in this case not from a nozzle ring, but only from a circular gap or an opening for the air passage between the outer circumference of the grinding table and the mill housing is spoken.
- the gas stream blown upward through the above-mentioned opening should have a speed sufficient to at least partially upward in a fine-grained powder to promote air classifiers arranged above the grinding table, while the remaining part of the relatively small-grained particles is to be blown back onto the grinding table, and in addition only the coarse-grained particles should fall down from the grinding table at the selected speed.
- These coarse-grained particles falling down are first collected with the aid of a mechanical conveyor and conveyed to a mechanical vertical conveyor, which in turn feeds the coarse-grained particles - via a feed channel - directly to the grinding table.
- the prerequisite in the preamble of claim 1 Art is set the air speed in the nozzle ring so high that essentially the entire, down to final fineness of material that is discharged over the edge of the grinding track, captured by the air flow and conveyed pneumatically to the classifier.
- the coarse fraction of the ground material that falls downward through the nozzle ring against the air flow is conveyed up by a mechanical conveying device and directly fed back into the grinding path.
- a disadvantage of this known method is the high pressure loss associated with the pneumatic conveying of the fine material, which requires the installation of a considerable fan output and entails considerable energy consumption during operation.
- the invention is therefore based on the object of designing a grinding method in accordance with the preamble of claim 1 and a grinding system in accordance with the preamble of claim 5 in such a way that the pressure loss associated with the pneumatic conveying is reduced, so that the required fan output is reduced and the energy consumption is reduced .
- the invention is based on the knowledge confirmed by extensive tests that a significant reduction in pressure loss and consequently a considerable reduction in the fan output to be installed and a considerable reduction in energy consumption can be achieved if the air speed in the nozzle ring is chosen to be so low that a part of the material, which has already been reduced to final fineness, falls downwards against the air flow through the nozzle ring and is conveyed up mechanically, whereby this is achieved by the mechanical conveyor highly conveyed goods are subjected to a screening and the resulting coarse fraction is returned to the grinding path of the ring mill.
- the mechanically conveyed goods are advantageously sifted using the same air stream, through which part of the goods discharged over the edge of the grinding track is carried upwards.
- the grinding system shown contains an annular mill 1 which contains a grinding table 3 rotating about a vertical axis 2 and which is driven from below by a drive 4. On the grinding path 3a of the grinding plate 3, grinding rollers 5 are supported, which rotate about horizontal axes 5a and are pressed onto the grinding path 3a by a holder (not shown in more detail).
- the grinding table 3 of the ring mill 1 is surrounded by a nozzle ring 6, which is used to supply an air flow, which is supplied via a connection 7 and through which Arrows 8 is illustrated.
- the width of the nozzle ring 6 and thus the air speed in the nozzle ring 6 can be adjusted by adjusting the nozzle ring 6.
- a dynamic classifier 9 is arranged above the ring mill 1 and has a fixed classifier Guide vane ring 10 contains.
- a rotor 11 is arranged within this guide vane ring 10 and can be rotated about a vertical axis and is driven by a drive motor (not shown) via a shaft 12.
- the shaft 12 is supported at the lower end in a bearing 13 which is adjustable in the radial direction via struts 14.
- the rotor 11 contains on its periphery a large number of adjustable deflector elements 15, which are preferably formed by wings or rods arranged parallel to the axis.
- the rotor 11 is open at the top and bottom.
- annular spreading plate 16 At the top of the rotor 11 there is an annular spreading plate 16 which can be rotated together with the rotor 11. In the housing cover 17 there are two connections 18a, 18b for feeding material to the spreading plate 16.
- the classifier 9 also contains a coarse material hopper 19 below the rotor 11, the lower hopper opening of which opens out above the grinding path 3a of the grinding plate 3. Goods are fed to the ring mill 1 via a goods feed opening 20.
- the grinding system also contains a mechanical conveyor device 21 and a gutter 22.
- the operation of the grinding plant according to the grinding process according to the invention is as follows:
- the material fed to the grinding table 3 of the ring mill 1 is crushed by the action of the grinding rollers 5 and discharged over the outer edge of the grinding track 3a.
- the air speed in the nozzle ring 6 is now chosen to be so low that not only the coarse material, but also part of the material, which has already been comminuted to its final fineness, fails downward against the air flow (arrows 23).
- the rest of the fine material (arrows 24) is caught by the air flow (arrows 8) and pneumatically conveyed up to the classifier 9.
- the material which has fallen downward in the nozzle ring 6 against the air flow (arrows 23) is conveyed up by the mechanical conveying device 21 and fed to the spreading plate 16 via the connections 18a, 18b (arrows 23a).
- the mechanically conveyed goods can also be fed directly to the grinding table 3 via the switch 22 (arrow 23b).
- the part of the mechanically conveyed material which is fed to the spreading plate 16 via the connections 18a, 18b is carried radially outward by the spreading plate 16, deflected downward via an annular deflecting member arranged on the housing ceiling 17 and then enters the room in front of the guide vane ring 10.
- the material conveyed up by the mechanical conveying device 21 and scattered in via the spreading plate 16 enters the air flow (arrow 8) which contains the pneumatically entrained material (arrow 24).
- the technical progress achieved by the invention is illustrated by the following experimental example:
- the air speed in the nozzle ring was reduced from 55 m / s to 40 m / s on a grinding plant.
- about 250 t / h of material were conveyed pneumatically upwards, this quantity dropped to 50 t / h, while the quantity to be mechanically increased accordingly.
- the entire mechanically conveyed material was immediately returned to the grinding path, so with the air speed reduced to 40 m / s, the entire mechanically conveyed material was fed into the spreading disc.
- the measures according to the invention resulted in an energy saving of approximately 20% for the entire system (mill and fan).
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Description
Die Erfindung betrifft ein Mahlverfahren (entsprechend dem Oberbegriff des Anspruches 1) sowie eine Mahlanlage (gemäß dem Gattungsbegriff des Anspruches 5).The invention relates to a grinding process (according to the preamble of claim 1) and a grinding plant (according to the preamble of claim 5).
Ringmühlen sind insbesondere in Form von Walzenschüsselmühlen, Rollenmühlen oder Kugelringmühlen bekannt. Dabei rollen die als Walzen, Rollen oder Kugeln ausgebildeten Mahlwerkzeuge auf einem ringförmigen Mahlteller ab, wobei der Mahldruck durch Federkraft, Hydraulikzylinder, durch Fliehkraft oder durch das Eigengewicht der Mahlwerkzeuge erzeugt wird.Ring mills are known in particular in the form of roller bowl mills, roller mills or ball ring mills. The grinding tools designed as rollers, rollers or balls roll on an annular grinding plate, the grinding pressure being generated by spring force, hydraulic cylinders, by centrifugal force or by the weight of the grinding tools.
Durch einen ortsfest am äußeren Umfang des Mahltellers angeordneten Düsenring wird bei derartigen Mühlen ein Luftstrom zugeführt, der die feinen Bestandteile des über den Rand des Mahltellers ausgetragenen, zerkleinerten Mahlgutes erfaßt und nach oben trägt, während die groben Bestandteile durch den Düsenring entgegen dem Luftstrom nach unten fallen und beispielsweise über ein mechanisches Förderwerk erneut der Mühle aufgegeben werden.In such mills, an air stream is fed through a nozzle ring which is arranged in a fixed manner on the outer circumference of the grinding plate and which detects and carries up the fine constituents of the comminuted ground material discharged over the edge of the grinding plate, while carrying the coarse constituents downward against the air flow through the nozzle ring fall and, for example, are re-fed to the mill via a mechanical conveyor.
In ähnlicher Weise erfolgt die Zerkleinerung von Mahlgut auch mit Hilfe der bekannten Ausführung gemäß DE-A-3 443 808, wobei in diesem Falle jedoch nicht von einem Düsenring, sondern lediglich von einem kreisförmigen Spalt oder einer Öffnung für den Luftdurchgang zwischen äußerem Mahltellerumfang und Mühlengehäuse gesprochen wird. Bei dem hier beschriebenen Mahlverfahren soll der durch die genannte Öffnung nach oben geblasene Gasstrom eine Geschwindigkeit haben, die ausreicht, um das feinkörnige Pulver wenigstens teilweise nach oben in einen über dem Mahlteller angeordneten Windsichter zu fördern, während der übrige Teil der relativ kleinkörnigen Partikel auf den Mahlteller zurückgeblasen werden soll, außerdem sollen bei der gewählten Geschwindigkeit nur die grobkörnigen Partikel vom Mahlteller nach unten fallen. Diese nach unten fallenden grobkörnigen Partikel werden zunächst mit Hilfe eines mechanischen Förderers gesammelt und zu einem mechanischen Senkrechtförderer gefördert, der seinerseits die grobkörnigen Partikel - über eine Aufgaberinne - direkt auf den Mahlteller zurückführt.In a similar way, the grinding material is also comminuted using the known design according to DE-A-3 443 808, but in this case not from a nozzle ring, but only from a circular gap or an opening for the air passage between the outer circumference of the grinding table and the mill housing is spoken. In the grinding process described here, the gas stream blown upward through the above-mentioned opening should have a speed sufficient to at least partially upward in a fine-grained powder to promote air classifiers arranged above the grinding table, while the remaining part of the relatively small-grained particles is to be blown back onto the grinding table, and in addition only the coarse-grained particles should fall down from the grinding table at the selected speed. These coarse-grained particles falling down are first collected with the aid of a mechanical conveyor and conveyed to a mechanical vertical conveyor, which in turn feeds the coarse-grained particles - via a feed channel - directly to the grinding table.
Bei dem bisher bekannten Mahlverfahren der im Oberbegriff des Anspruches 1 vorausgesetzten Art wird die Luftgeschwindigkeit im Düsenring so hoch eingestellt, daß im wesentlichen das gesamte, bis auf Endfeinheit zerkleinerte Gut, das über den Rand der Mahlbahn ausgetragen wird, vom Luftstrom erfaßt und pneumatisch zum Sichter hochgefördert wird. Der entgegen dem Luftstrom nach unten durch den Düsenring ausfallende Grobanteil des Mahlgutes wird durch eine mechanische Fördereinrichtung hochgefördert und direkt der Mahlbahn wieder aufgegeben.In the previously known grinding process, the prerequisite in the preamble of
Nachteilig ist bei diesem bekannten Verfahren der mit der pneumatischen Förderung des Feingutes verbundene hohe Druckverlust, der die Installation einer beträchtlichen Ventilatorleistung bedingt und im Betrieb einen erheblichen Energieverbrauch mit sich bringt.A disadvantage of this known method is the high pressure loss associated with the pneumatic conveying of the fine material, which requires the installation of a considerable fan output and entails considerable energy consumption during operation.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Mahlverfahren entsprechend dem Oberbegriff des Anspruches 1 sowie eine Mahlanlage gemäß dem Gattungsbegriff des Anspruches 5 so auszubilden, daß der mit der pneumatischen Förderung verbundene Druckverlust verringert wird, so daß die erforderliche Ventilatorleistung verkleinert und der Energieverbrauch gesenkt wird.The invention is therefore based on the object of designing a grinding method in accordance with the preamble of
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale der Ansprüche 1 bzw. 5 gelöst. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the characterizing features of
Der Erfindung liegt die durch umfangreiche Versuche bestätigte Erkenntnis zugrunde, daß sich eine wesentliche Verringerung des Druckverlustes und infolgedessen eine erhebliche Verkleinerung der zu installierenden Ventilatorleistung sowie eine beträchtliche Senkung des Energieverbrauches erreichen läßt, wenn die Luftgeschwindigkeit im Düsenring so niedrig gewählt wird, daß auch ein Teil des bereits auf Endfeinheit zerkleinerten Gutes entgegen dem Luftstrom durch den Düsenring nach unten ausfällt und mechanisch hochgefördert wird, wobei das durch die
mechanische Fördereinrichtung hochgeförderte Gut einer Sichtung unterworfen und der hierbei anfallende Grobanteil auf die Mahlbahn der Ringmühle zurückgeführt wird.The invention is based on the knowledge confirmed by extensive tests that a significant reduction in pressure loss and consequently a considerable reduction in the fan output to be installed and a considerable reduction in energy consumption can be achieved if the air speed in the nozzle ring is chosen to be so low that a part of the material, which has already been reduced to final fineness, falls downwards against the air flow through the nozzle ring and is conveyed up mechanically, whereby this is achieved by the
mechanical conveyor highly conveyed goods are subjected to a screening and the resulting coarse fraction is returned to the grinding path of the ring mill.
Vorteilhaft erfolgt hierbei die Sichtung des mechanisch hochgeförderten Gutes mit Hilfe desselben Luftstromes, durch den ein Teil des über den Rand der Mahlbahn ausgetragenen Gutes nach oben mitgenommen wird.In this case, the mechanically conveyed goods are advantageously sifted using the same air stream, through which part of the goods discharged over the edge of the grinding track is carried upwards.
Zweckmäßig wird dabei in der Sichtzone, in der die Sichtung des durch den Luftstrom nach oben mitgenommenen Gutes erfolgt, zugleich die Sichtung des mechanisch hochgeförderten Gutes vorgenommen. Auf diese Weise wird der für die Sichtung des pneumatisch hochgeförderten Gutes ohnehin erforderliche Sichter zugleich für die Sichtung des mechanisch hochgeförderten Gutes verwendet, was zu einer kostengünstigen Gesamtanlage führt.In this case, it is expedient in the viewing zone in which the goods carried along by the air flow to be viewed are at the same time the goods that are conveyed up mechanically to be viewed. In this way, the for pneumatically conveyed goods are used in any case necessary classifiers for the sighting of the mechanically conveyed goods, which leads to an inexpensive overall system.
Ein Ausführungsbeispiel einer Mahlanlage zur Durchführung des erfindungsgemäßen Mahlverfahrens ist in der Zeichnung schematisch veranschaulicht.An exemplary embodiment of a grinding plant for carrying out the grinding process according to the invention is illustrated schematically in the drawing.
Die dargestellte Mahlanlage enthält eine Ringmühle 1, die einen um eine vertikale Achse 2 rotierenden Mahlteller 3 enthält, der von unten her durch einen Antrieb 4 angetrieben ist. Auf der Mahlbahn 3a des Mahltellers 3 stützen sich Mahlrollen 5 ab, die um horizontale Achsen 5a rotieren und durch eine nicht näher veranschaulichte Halterung auf die Mahlbahn 3a gedrückt werden.The grinding system shown contains an
Der Mahlteller 3 der Ringmühle 1 ist von einem Düsenring 6 umgeben, der zur Zuführung eines Luftstromes dient, der über einen Anschluß 7 zugeführt wird und durch die
Pfeile 8 veranschaulicht ist. Die Weite des Düsenringes 6 und damit die Luftgeschwindigkeit im Düsenring 6 läßt sich durch Verstellen des Düsenringes 6 einstellen.The grinding table 3 of the
Oberhalb der Ringmühle 1 ist ein dynamischer Sichter 9 angeordnet, der einen feststehenden Leitschaufelkranz 10 enthält. Innerhalb dieses Leitschaufelkranzes 10 ist ein Rotor 11 angeordnet, der um eine vertikale Achse drehbar ist und über eine Welle 12 von einem nicht dargestellten Antriebsmotor angetrieben wird. Die Welle 12 ist am unteren Ende in einem Lager 13 gelagert, das über Streben 14 in radialer Richtung einstellbar ist.A dynamic classifier 9 is arranged above the
Der Rotor 11 enthält an seinem Umfang eine Vielzahl von verstellbaren Abweiserelementen 15, die vorzugsweise durch achsparallel angeordnete Flügel oder Stäbe gebildet werden. Stirnseitig ist der Rotor 11 am oberen und unteren Ende offen.The
An der Oberseite des Rotors 11 ist ein ringförmiger Streuteller 16 vorgesehen, der zusammen mit dem Rotor 11 drehbar ist. In der Gehäusedecke 17 befinden sich zwei Anschlüsse 18a, 18b zur Zuführung von Gut zum Streuteller 16.At the top of the
Der Sichter 9 enthält ferner unterhalb des Rotors 11 einen Grobguttrichter 19, dessen untere Trichteröffnung oberhalb der Mahlbahn 3a des Mahltellers 3 ausmündet. Die Zuführung von Gut zur Ringmühle 1 erfolgt über eine Gutaufgabeöffnung 20.The classifier 9 also contains a
Die Mahlanlage enthält ferner eine mechanische Fördereinrichtung 21 sowie eine Gutweiche 22.The grinding system also contains a
Die Wirkungsweise der Mahlanlage nach dem erfindungsgemäßen Mahlverfahren ist wie folgt:
Das dem Mahlteller 3 der Ringmühle 1 zugeführte Gut wird durch die Wirkung der Mahlrollen 5 zerkleinert und über den äußeren Rand der Mahlbahn 3a ausgetragen. Die Luftgeschwindigkeit im Düsenring 6 wird nun so niedrig gewählt, daß nicht nur das Grobgut, sondern auch ein Teil des bereits auf Endfeinheit zerkleinerten Gutes entgegen dem Luftstrom nach unten ausfällt (Pfeile 23). Der Rest des Feingutes (Pfeile 24) wird vom Luftstrom (Pfeile 8) erfaßt und pneumatisch zum Sichter 9 hochgefördert.The operation of the grinding plant according to the grinding process according to the invention is as follows:
The material fed to the grinding table 3 of the
Das entgegen dem Luftstrom im Düsenring 6 nach unten ausgefallene Gut (Pfeile 23) wird durch die mechanische Fördereinrichtung 21 hochgefördert und über die Anschlüsse 18a, 18b dem Streuteller 16 zugeführt (Pfeile 23a). Wahlweise (z. B. bei Mahlung unterschiedlicher Sorten) kann das mechanisch hochgeförderte Gut über die Gutweiche 22 auch direkt dem Mahlteller 3 zugeleitet werden (Pfeil 23b).
Der über die Anschlüsse 18a, 18b dem Streuteller 16 aufgegebene Teil des mechanisch hochgeförderten Gutes wird vom Streuteller 16 radial nach außen getragen, über ein an der Gehäusedecke 17 angeordnetes, ringförmiges Ablenkorgan nach unten umgelenkt und gelangt sodann in den Raum vor dem Leitschaufelkranz 10. Hier tritt das durch die mechanische Fördereinrichtung 21 hochgeförderte und über den Streuteller 16 eingestreute Gut (Pfeile 23a) in den Luftstrom (Pfeil 8) ein, der das pneumatisch mitgenommene Gut (Pfeil 24) enthält.The material which has fallen downward in the nozzle ring 6 against the air flow (arrows 23) is conveyed up by the
The part of the mechanically conveyed material which is fed to the spreading
In dem Sichtraum vor und hinter dem Leitschaufelkranz 10 erfolgt eine intensive Windsichtung, die durch die Abweiserelemente 15 am Umfang des Rotors 11 unterstützt wird. Das Feingut (Pfeil 25) verläßt zusammen mit dem Luftstrom (Pfeil 8) den Sichter 9 über eine zentrisch oberhalb des Rotors 11 angeschlossene Abzugsleitung 26, während das Grobgut (Pfeil 27) nach unten ausfällt und über den Grobguttrichter 19 zurück auf den Mahlteller 3 gelangt. Frisches Mahlgut (Pfeil 28) wird über die Gutaufgabeöffnung 20 zugeführt.In the viewing area in front of and behind the
Der durch die Erfindung erzielte technische Fortschritt sei an folgendem Versuchsbeispiel erläutert: An einer Mahlanlage wurde die Luftgeschwindigkeit im Düsenring von 55 m/s auf 40 m/s verringert. Wurden ursprünglich ca. 250 t/h Gut pneumatisch hochgefördert, so sank diese Menge auf 50 t/h, während die mechanisch hochzufördernde Menge entsprechend anstieg. Wurde ursprünglich (bei der Luftgeschwindigkeit von 55 m/s) das gesamte mechanisch hochgeförderte Material unmittelbar wieder der Mahlbahn zugeführt, so wurde bei der auf 40 m/s verringerten Luftgeschwindigkeit das gesamte mechanisch hochgeförderte Gut dem Streuteller aufgegeben. Für die gesamte Anlage (Mühle und Ventilator) ergab sich durch die erfindungsgemäßen Maßnahmen eine Energieersparnis von ca. 20 %.The technical progress achieved by the invention is illustrated by the following experimental example: The air speed in the nozzle ring was reduced from 55 m / s to 40 m / s on a grinding plant. Originally, about 250 t / h of material were conveyed pneumatically upwards, this quantity dropped to 50 t / h, while the quantity to be mechanically increased accordingly. Originally (at an air speed of 55 m / s), the entire mechanically conveyed material was immediately returned to the grinding path, so with the air speed reduced to 40 m / s, the entire mechanically conveyed material was fed into the spreading disc. The measures according to the invention resulted in an energy saving of approximately 20% for the entire system (mill and fan).
Claims (8)
- Grinding method in whicha) a proportion of the material which is comminuted in a ring mill (1) and discharged over the edge of the grinding track (3a) of this ring mill is carried upwards by an air stream which is delivered from below via an air ring (6) which surrounds the grinding track,b) whilst the remaining proportion of the material discharged over the edge of the grinding track falls out downwards against the air stream and through the air ring and is elevated by a mechanical conveyor (21),
characterized by the following features:c) the air speed in the air ring (6) is chosen so that it is sufficiently low that a proportion of the material already comminuted to the fineness of the finished product falls downwards against the air stream and through the air ring (6);d) the material elevated by the mechanical conveyor (21) is subjected to separation, the resulting tailings being delivered back to the grinding track (3a) of the ring mill (1). - Grinding method as claimed in claim 1, characterised in that the mechanically elevated material is separated with the aid of the same air stream by means of which a proportion of the material discharged over the edge of the grinding track (3) is carried upwards.
- Grinding method as claimed in claims 1 and 2, in which the material carried upwards by the air stream is delivered to a separation zone from which the tailings resulting from the separation are delivered back to the grinding track (3a) of the ring mill (1), characterised in that the separation of the mechanically elevated material is also carried out at the same time in the separation zone in which the material carried upwards by the air stream is separated.
- Grinding method as claimed in claim 1, characterised in that if required the mechanically elevated material is delivered back directly to the grinding track (3a) of the ring mill (1).
- Grinding apparatus containinga) a ring mill (1), the grinding track (3a) of which is surrounded by an air ring (6) which serves for delivery of an air stream which carries the material discharged over the edge of the grinding track upwards with it,b) a separator (9) arranged above the grinding track (3a) for separation of the air stream which is charged with material, the tailings deposited in this separator being delivered back to the grinding track,c) a mechanical conveyor (21) for elevating the material falling down through the air ring (6).
characterised by the following feature:d) the separator is provided with a material delivery arrangement (16, 18a, 18b) by means of which the material elevated by the mechanical conveyor (21) is introduced into the air stream which is used for the pneumatic elevation of material. - Grinding apparatus as claimed in claim 5, characterised by the following components of the separator:a) a stationary guide vane ring (10) for delivery of the air stream which is charged with pneumatically elevated material,b) a rotor (11) which is arranged inside the guide vane ring (10), is rotatable about a vertical axis and has a plurality of adjustable deflector elements (15) on its periphery,c) an annular distributor plate (16) which is arranged on the upper face of the rotor (11) and rotatable therewith to deliver and distribute the mechanically elevated material,d) a connection (26) arranged centrally above the rotor (11) to discharge the air stream which is charged with fines,e) a hopper (19) which is arranged below the rotor (11) and opens above the grinding track (3a) for removal of the tailings.
- Grinding apparatus as claimed in claim 6, characterised in that at least two connections (18a, 18b) distributed symmetrically about the periphery are provided above the annular distributor plate (16) for the delivery of the mechanically elevated material.
- Grinding apparatus as claimed in claim 5, characterised in that a material divider (22) is provided by means of which the material elevated by the mechanical conveyor (21) can be delivered as required to the separator (9) or direct to the grinding track (3a).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3801229A DE3801229A1 (en) | 1988-01-18 | 1988-01-18 | GRINDING METHOD AND MILLING PLANT |
| DE3801229 | 1988-01-18 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0325770A2 EP0325770A2 (en) | 1989-08-02 |
| EP0325770A3 EP0325770A3 (en) | 1990-02-14 |
| EP0325770B1 true EP0325770B1 (en) | 1992-04-01 |
Family
ID=6345452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88121321A Expired - Lifetime EP0325770B1 (en) | 1988-01-18 | 1988-12-20 | Grinding method and arrangement |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4919341A (en) |
| EP (1) | EP0325770B1 (en) |
| DE (2) | DE3801229A1 (en) |
| ES (1) | ES2030148T3 (en) |
| ZA (1) | ZA889554B (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2617623B2 (en) * | 1991-01-21 | 1997-06-04 | 三菱重工業株式会社 | Roller mill |
| US5251831A (en) * | 1991-01-21 | 1993-10-12 | Mitsubishi Jukogyo Kabushiki Kaisha | Roller mill |
| DE4124416A1 (en) * | 1991-07-23 | 1993-01-28 | Krupp Polysius Ag | DEVICE AND METHOD FOR CRUSHING GROUND DIFFERENT GRAIN |
| US5137218A (en) * | 1991-08-26 | 1992-08-11 | Western Farmers Electric Cooperative | Pulverizer for reducing the possibility of explosions |
| US5330110A (en) * | 1993-07-12 | 1994-07-19 | Williams Robert M | Apparatus for grinding material to a fineness grade |
| DE4323587C2 (en) * | 1993-07-14 | 1996-07-18 | Loesche Gmbh | Method and device for crushing material of different grain sizes |
| GB9317849D0 (en) * | 1993-08-27 | 1993-10-13 | Bpb Industries Plc | Improvements in calcination |
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| US7156235B2 (en) * | 2004-02-26 | 2007-01-02 | Foster Wheeler Energy Corporation | Apparatus for and method of classifying particles discharged from a vertical mill |
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| CN115650704B (en) * | 2022-10-25 | 2023-08-15 | 宜兴市国强炉业有限公司 | High-heat-conductivity wear-resistant material and crushing and grinding process thereof |
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| US3951347A (en) * | 1972-09-21 | 1976-04-20 | Polysius Ag | Apparatus for crushing material containing particles that are hard to pulverize |
| DE2600499A1 (en) * | 1976-01-08 | 1977-07-21 | Polysius Ag | PROCESS AND EQUIPMENT FOR PROCESSING ABRASIVE GOODS |
| US4084754A (en) * | 1976-07-27 | 1978-04-18 | Loesche Hartzerkleinerungs-Und Zementmaschinen Gmbh & Co. Kg | Combined vane-rotor separator |
| US4597537A (en) * | 1982-09-14 | 1986-07-01 | Onoda Cement Company, Ltd. | Vertical mill |
| US4504018A (en) * | 1982-12-13 | 1985-03-12 | Foster Wheeler Energy Corporation | Particle classifier apparatus and method with rudder control vane |
| JPS60118250A (en) * | 1983-11-30 | 1985-06-25 | 三菱重工業株式会社 | Method of grinding solid substance |
| DE3418197A1 (en) * | 1984-05-16 | 1985-11-21 | Krupp Polysius Ag, 4720 Beckum | GRINDING METHOD AND MILLING PLANT |
| GB2181971B (en) * | 1985-10-29 | 1988-11-09 | Smidth & Co As F L | Vertical roller mill |
| US4752037A (en) * | 1987-04-01 | 1988-06-21 | Combustion Engineering, Inc. | Vane wheel assembly for rb mills |
-
1988
- 1988-01-18 DE DE3801229A patent/DE3801229A1/en not_active Withdrawn
- 1988-12-20 ES ES198888121321T patent/ES2030148T3/en not_active Expired - Lifetime
- 1988-12-20 DE DE8888121321T patent/DE3869759D1/en not_active Expired - Fee Related
- 1988-12-20 EP EP88121321A patent/EP0325770B1/en not_active Expired - Lifetime
- 1988-12-21 ZA ZA889554A patent/ZA889554B/en unknown
- 1988-12-23 US US07/289,059 patent/US4919341A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US4919341A (en) | 1990-04-24 |
| EP0325770A2 (en) | 1989-08-02 |
| ES2030148T3 (en) | 1992-10-16 |
| ZA889554B (en) | 1989-09-27 |
| DE3869759D1 (en) | 1992-05-07 |
| DE3801229A1 (en) | 1989-07-27 |
| EP0325770A3 (en) | 1990-02-14 |
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