EP0204081B1 - Method and installation for double-stage crushing - Google Patents

Method and installation for double-stage crushing Download PDF

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Publication number
EP0204081B1
EP0204081B1 EP86103293A EP86103293A EP0204081B1 EP 0204081 B1 EP0204081 B1 EP 0204081B1 EP 86103293 A EP86103293 A EP 86103293A EP 86103293 A EP86103293 A EP 86103293A EP 0204081 B1 EP0204081 B1 EP 0204081B1
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EP
European Patent Office
Prior art keywords
mill
tailings
roller mill
roller
fresh material
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Expired
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EP86103293A
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German (de)
French (fr)
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EP0204081A3 (en
EP0204081A2 (en
Inventor
Tyark Dipl.-Ing. Allers
Gotthardt Dipl.-Ing. Blasczyk
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius 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
    • B02C4/00—Crushing or disintegrating by roller mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

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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 Verfahren entsprechend dem Oberbegriff des Anspruches 1, ferner eine Anlage zur Durchführung dieses Verfahrens.The invention relates to a method according to the preamble of claim 1, furthermore a system for performing this method.

Ein Verfahren der im Oberbegriff des Anspruches 1 vorausgesetzten Art ist durch die europäische Patentanmeldung 00 84 383 bekannt.A method of the type required in the preamble of claim 1 is known from European patent application 00 84 383.

In Abhängigkeit von der Mahlbarkeit des Gutes unterliegt die Menge der vom Sichter zum Mahlsystem rückgeführten Grieße gewissen Schwankungen. Um hierbei die Zerkleinerungsverhältnisse in der zweiten Mühle, beispielsweise einer Kugelmühle, optimal zu halten, ist es bekannt, die Frischgutmenge in Abhängigkeit von der rückgeführten Grießmenge so zu regeln, daß die Summe von Frischgutmenge und Grießmenge und damit der Füllungsgrad der nachgeschalteten Mühle konstant bleibt.Depending on the grindability of the material, the amount of the semolina returned from the classifier to the grinding system is subject to certain fluctuations. In order to optimally keep the comminution conditions in the second mill, for example a ball mill, it is known to regulate the quantity of fresh material as a function of the returned quantity of semolina so that the sum of the quantity of fresh material and quantity and thus the degree of filling of the downstream mill remains constant.

Durch Veränderung der Frischgutmenge würde sich nun bei konstanter Drehzahl der Walzenmühle ein unterschiedlicher Materialfüllstand im Aufgabeschacht der Walzenmühle einstellen. Dies würde eine Änderung der Mahlverhältnisse in der Walzenmühle mit sich bringen und unter Umständen zu einem Vollaufen oder Leerlaufen des Aufgabeschachtes führen.By changing the quantity of fresh material, a different material fill level would now occur in the feed shaft of the roller mill at a constant speed of rotation of the roller mill. This would result in a change in the grinding conditions in the roller mill and possibly lead to the feed chute becoming full or empty.

Um diesen Nachteil zu vermeiden, ist es bekannt, bei einer Änderung der Frischgutmenge (die in Anpassung an die jeweilige Grießmenge erfolgt) die Drehzahl der Walzenmühle entsprechend zu verändern, um auf diese Weise einen konstanten Füllstand im Aufgabeschacht der Walzenmühle zu erzielen. Ein solches Verfahren erfordert jedoch Regelantriebe für die beiden Walzen der Walzenmühle, was einen verhältnismäßig großen Aufwand darstellt.In order to avoid this disadvantage, it is known to change the speed of the roller mill accordingly in the event of a change in the quantity of fresh material (which takes place in adaptation to the respective quantity of semolina), in order in this way to achieve a constant fill level in the feed shaft of the roller mill. However, such a method requires control drives for the two rolls of the roll mill, which represents a relatively large outlay.

Die Erfindung geht demgegenüber von einem Verfahren aus, bei dem die Walzen der Walzenmühle mit konstanter Drehzahl umlaufen, so daß einfache, ungeregelte Antriebe Verwendung finden können.In contrast, the invention is based on a method in which the rollers of the roller mill rotate at a constant speed, so that simple, uncontrolled drives can be used.

Der Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren der im Oberbegriff des Anspruches 1 vorausgesetzten Art so auszubilden, daß mit einem vergleichsweise geringen anlagentechnischen Aufwand optimale Zerkleinerungsverhältnisse in der Walzenmühle und in der nachgeschalteten Mühle gewährleistet sind.The invention is based on the object of designing a method of the type required in the preamble of claim 1 in such a way that optimal comminution ratios in the roller mill and in the downstream mill are ensured with a comparatively low system outlay.

Diese Aufgabe wird erfindungsgemäß durch das kennzeichnende Merkmal des Anspruches 1 gelöst.This object is achieved by the characterizing feature of claim 1.

Um auch bei einer Änderung der Mahlbarkeit und einer dadurch bedingten Änderung der rückgeführten Grießmenge sowie einer entsprechend geänderten Frischgutmenge konstante Zerkleinerungsverhältnisse nicht nur in der nachgeschalteten zweiten Mühle, sondern auch in der Walzenmühle zu erzielen, wird erfindungsgemäß gerade ein so großer Teil der Grieße der Walzenmühle zugeführt, daß im Aufgabeschacht der Walzenmühle auch bei wechselnder Frischgutmenge ein konstanter Füllstand aufrechterhalten wird.In order to achieve constant comminution ratios not only in the downstream second mill, but also in the roller mill, even with a change in the grindability and a consequent change in the quantity of recirculated semolina and a correspondingly changed quantity of fresh material, according to the invention such a large part of the size is fed to the roller mill that a constant fill level is maintained in the feed shaft of the roller mill even with changing quantities of fresh material.

Wenn sich beispielsweise bei verringerter Mahlbarkeit des Gutes die Grießmenge erhöht und infolgedessen (zur Erzielung eines konstanten Füllungsgrades in der nachgeschalteten Mühle) die Frischgutmenge verringert wird, so wird erfindungsgemäß ein vergrößerter Anteil der Grieße der Walzenmühle zugeführt, so daß der konstante Füllstand im Aufgabeschacht dieser Mühle gleichbleibende Einzugsbedingungen und damit optimale Zerkleinerungsverhältnisse gewährleistet.For example, if the quantity of semolina increases with reduced grindability of the material and, as a result (to achieve a constant degree of filling in the downstream mill), the quantity of fresh material is reduced, then according to the invention an increased proportion of the size of the roller mill is fed so that the constant level in the feed shaft of this mill constant feed conditions and thus optimal shredding conditions guaranteed.

Mit dem erfindungsgemäßen Verfahren ist es damit beispielsweise möglich, in derselben Mahlanlage mehrere Zementsorten unterschiedlicher Feinheit mit optimaler Auslastung der Anlage bei geringem spezifischen Energieverbrauch zu erzeugen. So wird beim Mahlen von Zement hoher Feinheit und entsprechend verringerter Frischgutmenge der in der Walzenmühle fehlende Teil der Frischgutmenge durch einen erhöhten Anteil an rückgeführten Grie- ßen ersetzt. Es wird auf diese Weise ein gewisser Teil der Zerkleinerungsarbeit von der nachgeschalteten Mühle auf die Walzenmühle verlagert, wobei beide Mühlen des Mahlsystemes unter optimalen Zerkleinerungsbedingungen arbeiten können.With the method according to the invention it is thus possible, for example, to produce several types of cement of different fineness in the same grinding plant with optimum utilization of the plant with low specific energy consumption. When grinding cement with a high degree of fineness and a correspondingly reduced quantity of fresh material, the part of the quantity of fresh material missing in the roller mill is replaced by an increased proportion of recycled semolina. In this way, a certain part of the shredding work is shifted from the downstream mill to the roller mill, both mills of the grinding system being able to work under optimal shredding conditions.

Ein Ausführungsbeispiel einer Anlage zur Durchführung des erfindungsgemäßen Verfahrens ist in der Zeichnung schematisch veranschaulicht.An exemplary embodiment of a system for carrying out the method according to the invention is illustrated schematically in the drawing.

Die Anlage enthält eine Walzenmühle 1, eine nachgeschaltete zweite Mühle 2, die beispielsweise als Kugelmühle ausgebildet ist, und einen Sichter 3.The system contains a roller mill 1, a downstream second mill 2, which is designed, for example, as a ball mill, and a classifier 3.

Das Mahlgut wird aus einem Vorratsbunker 4 über eine Dosierbandwaage 5 dem Aufgabeschacht 6 der Walzenmühle 1 zugeführt, die zwei angetriebene Walzen 7, 8 enthält, die zwischen sich einen Walzenspalt 9 bilden.The regrind is fed from a storage hopper 4 via a dosing belt scale 5 to the feed shaft 6 of the roller mill 1, which contains two driven rollers 7, 8, which form a roller gap 9 between them.

Das in der Walzenmühle 1 zerkleinerte Mahlgut gelangt über ein Förderorgan 10 zur zweiten Mühle 2, wo die in der Walzenmühle 1 gebildeten Agglomerate aufgelöst und eventuell weiter zerkleinert werden.The ground material comminuted in the roller mill 1 passes via a conveying element 10 to the second mill 2, where the agglomerates formed in the roller mill 1 are dissolved and possibly further comminuted.

Das aus der Mühle 2 ausgetragene Gut wird über ein Becherwerk 11 dem Sichter 3 zugeführt, aus dem einerseits das Fertiggut (Pfeil 12) und andererseits Grieße (Pfeil 13) abgezogen werden.The material discharged from the mill 2 is fed to the sifter 3 via a bucket elevator 11, from which the finished product (arrow 12) and semolina (arrow 13) are drawn off.

Die Grieße (Pfeil 13) gelangen zu einer Verteilereinrichtung 14 und von hier aus teilweise zurück zur Aufgabeseite der Mühle 2 (Pfeil 15) und teilweise (Pfeil 16) zum Aufgabeschacht 6 der Walzen mühle 1.The semolina (arrow 13) arrive at a distributor device 14 and from here partly back to the feed side of the mill 2 (arrow 15) and partly (arrow 16) to the feed shaft 6 of the roller mill 1.

Weiterhin enthält die Anlage folgende Regelkreise:

  • Ein erster Regelkreis dient dazu, die Summe von Frischgutmenge und Grießmenge bei Schwankungen der Mahlbarkeit konstantzuhalten. Dieser Regelkreis enthält einen Regler 17, der über ein Element 18 ein der jeweiligen Grießmenge entsprechendes Signal erhält und der über ein Element 19 auf die Dosierbandwaage 5 einwirkt. Hierdurch wird die Frischgutmenge verringert, wenn die Grießmenge steigt und umgekehrt.
The system also contains the following control loops:
  • A first control loop serves to keep the sum of the quantity of fresh material and the amount of semolina constant in the event of fluctuations in the grindability. This control circuit contains a controller 17 which receives a signal corresponding to the respective semolina quantity via an element 18 and which acts on the dosing belt scale 5 via an element 19. This reduces the amount of fresh produce when the amount of semolina increases and vice versa.

Ein zweiter Regelkreis dient dazu, unabhängig von Schwankungen der Frischgutmenge (Pfeil 20) den Füllstand im Aufgabeschacht 6 der Walzenmühle 1 konstantzuhalten. Dieser Regelkreis enthält einen Regler 21, der über ein (beispielsweise auf Ultraschallbasis arbeitendes)Füllstandsmeßgerät 22 und ein Element 23 ein dem jeweiligen Füllstand im Aufgabeschacht 6 entsprechendes Signal erhält und der ein entsprechendes Steuersignal über ein Element 24 an die Verteilereinrichtung 14 liefert.A second control loop is used to keep the fill level in the feed shaft 6 of the roller mill 1 constant, regardless of fluctuations in the quantity of fresh material (arrow 20). This control circuit contains a controller 21 which receives a signal corresponding to the respective fill level in the feed chute 6 via a fill level measuring device 22 (for example operating on an ultrasound basis) and an element 23 and which delivers a corresponding control signal via an element 24 to the distribution device 14.

Verringert sich die Mahlbarkeit des Gutes oder wird ein Endprodukt höherer Feinheit gewünscht, so vergrößert sich die Grießmenge (Pfeil 13). Die Frischgutmenge (Pfeil 20) wird durch den Regler 17 entsprechend verringert. Um trotzdem den Füllstand im Aufgabeschacht 6 konstantzuhalten, vergrößert der Regler 21 in diesem Falle über die Verteilereinrichtung 14 den Anteil der Grieße, der zum Aufgabeschacht 6 zurückgeführt wird (Pfeil 16).If the grindability of the goods is reduced or if an end product of higher fineness is desired, the amount of semolina increases (arrow 13). The amount of fresh material (arrow 20) is reduced accordingly by the controller 17. In order to keep the fill level in the feed chute 6 constant in this case, the controller 21 in this case increases the portion of the semolina via the distributor device 14, which portion is returned to the feed chute 6 (arrow 16).

Bei einer Verbesserung der Mahlbarkeit des Gutes bzw. einer gewünschten gröberen Körnung des Endproduktes verlaufen die Regelvorgänge in umgekehrter Richtung.If the grindability of the material or the desired coarser grain of the end product is improved, the control processes run in the opposite direction.

Die beiden Walzen 7 und 8 der Walzenmühle 1 werden durch ungeregelte einfache Antriebe 25, 26 mit konstanter Drehzahl angetrieben.The two rollers 7 and 8 of the roller mill 1 are driven by uncontrolled simple drives 25, 26 at a constant speed.

Die in den Reglern 17, 21 und in den weiteren Elementen 18, 19, 23 und 24 der beiden Regelkreise enthaltenen Buchstaben haben folgende Bedeutung:

  • F = Menge
  • I = Anzeige
  • R = Aufzeichnung
  • C = Regelung
  • A = Alarm
  • L = Füllstand
  • POS = Stellung

Die Korngröße zumindest eines Teiles der Frischgutes ist zweckmäßig größer als der Walzenspalt 9, so daß dieser Teil des Mahlgutes im Walzenspalt 9 zunächst eine Einzelkornzerkleinerung und anschließend eine Gutbettzerkleinerung erfährt. Die auf das Mahlgut wirkende Preßkraft der Walzen 7 und 8 beträgt hierbei mehr als 2 t/cm Walzenlänge.The letters contained in the controllers 17, 21 and in the further elements 18, 19, 23 and 24 of the two control loops have the following meaning:
  • F = quantity
  • I = display
  • R = record
  • C = regulation
  • A = alarm
  • L = level
  • POS = position

The grain size of at least a part of the fresh material is expediently larger than the nip 9, so that this part of the ground material in the nip 9 is first subjected to an individual grain size reduction and then to a material bed size reduction. The pressing force of the rollers 7 and 8 acting on the regrind is more than 2 t / cm roller length.

Während bei dem dargestellten und beschriebenen Ausführungsbeispiel Walzen 7, 8 angetrieben sind, ist es im Rahmen der Erfindung auch möglich, nur eine dieser Walzen, vorzugsweise die Festwalze, anzutreiben.While rollers 7, 8 are driven in the illustrated and described exemplary embodiment, it is also possible within the scope of the invention to drive only one of these rollers, preferably the fixed roller.

Claims (3)

1. Method of two-stage crushing of brittle material for grinding, such as cement clinker, in which
a) the material for grinding first of all undergoes material bed crushing in the gap (9) of a roller mill (1
b) the agglomerates formed hereby are than broken up and if necessary further crushed in a second mill (2) arranged after the roller mill (1),
c) the material discharged from the second mill (2) is subjected to separation and the resulting tailings (13) are delivered back to the grinding system,
d) and the quantity of fresh material (2) is regulated as a function of the quantity of tailings (13) returned so that the sum of the quantities of fresh material and tailings remains constant, characterised by the following feature:
e) the quantity (16) of tailings (13) delivered to the roller mill (1) is such that an almost constant filling level is maintained in the delivery shaft (6) of the roller mill even when the quantity of fresh material (2) alters.
2. Method as claimed in claim 1, characterised in that the grain size of at least a proportion of the fresh material (20) is greater than the roller gap (9), so that in the roller gap this proportion of the material for grinding first undergoes individual grain crushing and then material bed crushing.
3. Apparatus for carrying out the method according to claim 1, containing
a) a roller mill (1) with two rollers (7, 8) of which at least one roller is provided with a constant-speed drive (25, 26),
b) a delivery shaft (6) which has an arrangement (2) for monitoring the filling level,
c) a second mill (2) arranged after the roller mill (1
d) at least one separator (3) for separating the material discharged from the second mill,
e) arrangements for delivering the tailings (13) resulting from the separation back to the grinding system,
f) a regulator (17) which regulates the quantity of fresh material (20) as a function of the quantity of tailings (13) returned in such a way that the sum of the quantities of fresh material and tailings remains constant.
g) a distributor arrangement (14) by means of which adjustable proportions of the tailings (13) resulting from the separation are delivered some to the roller mill (1) and some to the subsequent second mill (2); characterised by the following feature:
h) there is a further regulator (21) which via the distributor arrangement (14) controls the proportion of the tailings (13) delivered to the roller mill (1) in such a way that an almost constant filling level is maintained in the delivery shaft of the roller mill (1) even when the quantity of fresh material alters.
EP86103293A 1985-06-04 1986-03-12 Method and installation for double-stage crushing Expired EP0204081B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3520069 1985-06-04
DE19853520069 DE3520069A1 (en) 1985-06-04 1985-06-04 METHOD AND PLANT FOR TWO-STAGE CRUSHING

Publications (3)

Publication Number Publication Date
EP0204081A2 EP0204081A2 (en) 1986-12-10
EP0204081A3 EP0204081A3 (en) 1987-08-19
EP0204081B1 true EP0204081B1 (en) 1989-08-02

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ID=6272442

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Application Number Title Priority Date Filing Date
EP86103293A Expired EP0204081B1 (en) 1985-06-04 1986-03-12 Method and installation for double-stage crushing

Country Status (9)

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US (1) US4690335A (en)
EP (1) EP0204081B1 (en)
JP (1) JPS61278363A (en)
KR (2) KR870000105A (en)
BR (1) BR8601745A (en)
CA (1) CA1246518A (en)
DE (2) DE3520069A1 (en)
ES (1) ES8801881A1 (en)
IN (1) IN166229B (en)

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Also Published As

Publication number Publication date
KR870000105A (en) 1987-02-16
EP0204081A3 (en) 1987-08-19
BR8601745A (en) 1987-03-10
ES555667A0 (en) 1988-03-01
KR900003784B1 (en) 1990-05-31
CA1246518A (en) 1988-12-13
IN166229B (en) 1990-03-31
DE3520069A1 (en) 1986-12-04
DE3664731D1 (en) 1989-09-07
EP0204081A2 (en) 1986-12-10
US4690335A (en) 1987-09-01
ES8801881A1 (en) 1988-03-01
JPH0239938B2 (en) 1990-09-07
JPS61278363A (en) 1986-12-09

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