EP0165429B1 - Procédé pour l'entraînement d'une installation de broyage et dispositif pour l'exécution de ce procédé - Google Patents

Procédé pour l'entraînement d'une installation de broyage et dispositif pour l'exécution de ce procédé Download PDF

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Publication number
EP0165429B1
EP0165429B1 EP85105567A EP85105567A EP0165429B1 EP 0165429 B1 EP0165429 B1 EP 0165429B1 EP 85105567 A EP85105567 A EP 85105567A EP 85105567 A EP85105567 A EP 85105567A EP 0165429 B1 EP0165429 B1 EP 0165429B1
Authority
EP
European Patent Office
Prior art keywords
nozzle ring
mill
segments
sifter
control circuit
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.)
Expired
Application number
EP85105567A
Other languages
German (de)
English (en)
Other versions
EP0165429A1 (fr
Inventor
Heinrich Dipl.-Ing. Henne
Ludger Dipl.-Ing. Lohnherr
Walter Dipl.-Ing. Holz
Peter Dipl.-Ing. Rittscher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0165429A1 publication Critical patent/EP0165429A1/fr
Application granted granted Critical
Publication of EP0165429B1 publication Critical patent/EP0165429B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface

Definitions

  • the invention relates to a prior art method according to the preamble of claim 1, furthermore to a grinding system operating according to this method and also belonging to the prior art according to the preamble of claim 5.
  • the amount of hot gas flow passing through the mill and the classifier is kept constant by a control circuit, a constant gas speed also being established in the nozzle ring of the mill. Due to dynamic processes within the grinding system, however, the amount of material falling through the nozzle ring and transported back up by the bucket elevator and its particle size distribution fluctuate even at constant gas velocity in the nozzle ring. This change in the quantity and grain distribution of the circulating material is disadvantageous, since when producing special products or, for example, also during cement grinding, it is often desirable to keep the quantity and grain distribution of the circulating material constant, for example in order to pull a certain grain belt from the circulating material.
  • the prior art includes a process (CH-A-435940) which uses a hammer mill heated with hot gas for coarse comminution and a tube mill for comminution, a screening device and a centrifugal separator being provided between these two mills.
  • the material discharged from the hammer mill first arrives at the screening device, the coarse fraction being fed back to the hammer mill, while the fine fraction is fed to the centrifugal classifier.
  • the semolina accumulating in the centrifuge goes to the tube mill for further crushing, while the fine fraction of the centrifuge forms the finished product.
  • the coarse material fed back from the screening device to the hammer mill is dosed as a function of the pressure difference of the hot gases at the outlet and inlet of the hammer mill.
  • the invention has for its object to provide a method of the type required in the preamble of claim 1 so that the amount and grain composition of the goods conveyed via the bucket elevator (ie the material in circulation) is kept constant and at the same time possible operational disruptions (such as filling up or emptying) Mill) can be avoided.
  • the roller mill schematically illustrated in FIGS. 1 and 2 contains an annular grinding plate 2 rotating about a vertical axis 1, on which two pairs of rollers 3, 4 roll.
  • a stationary nozzle ring 5 is arranged, which serves to supply an air flow which detects the fine components of the crushed ground material discharged over the edge of the grinding plate and carries them upwards, while the coarse components through the nozzle ring 5 counter to that Airflow falling down.
  • the nozzle ring 5 is divided into several segments, of which the segment 5a is illustrated in detail in FIG. 1.
  • the segment 5a of the nozzle ring 5 contains an inner stationary wall part 6 which is connected to the housing 9 of the mill via two lateral guide parts 7, 8.
  • the stationary inner wall part 6 carries a number of webs 6a which point outwards.
  • segment 5a of the nozzle ring 5 contains an outer adjustable wall part 10 which is connected to the push spindle 11 of a pneumatic cylinder 12.
  • the thrust spindle 11 is guided radially in slide guides 13, 14.
  • the pneumatic cylinder 12 is supported by a flange 15 which is fastened to the housing 9 by means of struts 16, 17.
  • the outer wall part 10 of the segment 5a of the nozzle ring 5 is adjustable by means of the spindle 11 of the pneumatic cylinder 12 in the radial direction (double arrow 18), namely between a radially outer position in which the wall part 10 is located near the housing 9 and one Position 10 'indicated by dashed lines, in which the adjustable wall part 10 touches the struts 6a of the stationary inner wall part 6 and in which it limits the clear cross-section of the interior 19 of the segment 5a through which the air flows, to a minimum.
  • the adjustable wall part 10 of the segment 5a is guided in the region of the ends facing the adjacent segments on parallel guide surfaces 7a, 8a of the guide parts 7, 8.
  • a link guide can be provided in the area of these guide surfaces 7a, 8a in order to exclude the risk of the adjustable outer wall part 10 tilting with respect to a horizontal plane.
  • the number of segments of the nozzle ring 5, each provided with a separate drive, ventilated and adjustable, is adapted to the respective application.
  • the nozzle ring can also contain individual non-ventilated segments between ventilated and adjustable segments. For example, a version with eight ventilated, adjustable segments and four non-ventilated segments arranged between them is conceivable.
  • Fig. 3 shows in schematic form an embodiment in which four air inlets 20, 21, 22, 23 are provided, to which separately adjustable segments 5'a, 5'b, 5'c and 5'd are assigned.
  • These four segments 5'a to 5'd of the nozzle ring 5 ' have, as in the exemplary embodiment already explained with reference to FIGS. And 2, a wall which is adjustable from the outside during operation and which provides the clear opening Cross-section of the nozzle ring is limited and the flow conditions of the air in the area of the relevant segment can be changed by adjusting them.
  • the devices for adjusting the cross section of the nozzle ring are likewise not illustrated in FIG. 3.
  • Adjusting flaps 24 to 27 are provided in the air inlets 20 to 23, which allow a more or less severe throttling of the supplied air streams.
  • the air supplied by the air inlets 20 to 23 is distributed in the manner schematically indicated by the arrows over the circumferential length of the segments 5'a to 5'd of the nozzle ring 5 '.
  • the circumferential zones of the grinding table assigned to the individual segments 5'a to 5'd of the nozzle ring 5 ' can be ventilated differently (with regard to the flow quantities and flow velocities), which is due to the different material accumulation in the individual zones Optimization of the pneumatic good discharge possible.
  • the air also flows essentially from bottom to top through the nozzle ring 5 '.
  • the air flow through the nozzle ring 5 is indicated by the arrow 28.
  • the fine constituents of the comminuted material discharged over the edge of the grinding plate 2 are taken upward - arrow 29 -, while the coarse constituents of the ground material fall downward against the air flow (arrow 29 ').
  • Fig. 4 shows the diagram of a grinding plant operated according to the inventive method.
  • This grinding system contains a ring or roller mill 31, a classifier 32 arranged above the mill 31, a fan 33, an electrostatic filter 34, a bucket elevator 35 and a dosing belt scale 36.
  • the fan 33 generates a hot gas flow which is fed to the mill 31 via a line 37, which passes through the mill with the nozzle ring 5 already explained, then flows through the classifier 32 and is discharged via a line 38 and the electrostatic filter 34 into a chimney 39 .
  • a return air line 40 with a flap 41 arranged therein enables the return of an adjustable portion of the gas flow from line 38 to line 37.
  • the material to be ground is fed from a silo 42 via the dosing belt scale 36 and a material line 43 to the mill 31.
  • the fine constituents of the comminuted ground material discharged over the edge of the grinding plate 2 are caught by the gas stream and transported upwards to the classifier 32, where the finished material is separated.
  • the coarse constituents of the comminuted ground material discharged through the nozzle ring 5 fall down through a feed line 44 into the bucket elevator 35, which conveys them upwards to a sieving or distribution device 45.
  • a certain proportion, for example a certain grain fraction, of the circulating material can be drawn off, while the circulating material is otherwise guided back to the mill 31 via the material line 43.
  • the system according to FIG. 4 contains a first control circuit which keeps the amount of the hot gas flow passing through the mill 31 and the classifier 32 constant.
  • This first control circuit includes a controller 46, which receives a signal from a Venturi tube 47 in line 38 via the amount of gas passing through line 38 and which controls the fan 33 via a motor 48 in order to keep the amount of gas constant.
  • the system contains a second control circuit by means of which the gas velocity in the nozzle ring 5 is changed as a function of the power consumption of the bucket elevator 35 in such a way that the quantity of the material conveyed via the bucket elevator 35 and its grain composition are kept constant.
  • This second control loop contains a higher-level controller 49 and downstream controllers 50a, 50b, 50c etc., the interaction of which will be explained in detail with reference to FIG. 6.
  • a third control loop is also provided. which reduces the material feed to the mill 31 when the gas speed in the nozzle ring 5 exceeds a predetermined maximum value, while it increases the material feed when the gas speed in the nozzle ring 5 falls below a predetermined minimum value steps.
  • This third control circuit contains a controller 51, which is connected to one or more of the downstream controllers 50a, 50b, 50c and acts on the dosing belt scale 36.
  • a fourth control circuit which controls the temperature of the hot gas flow passing through the mill 31 and the classifier 32 in such a way that the gas temperature after the classifier 32 is used as a guide variable for the setpoint value of the gas temperature before the mill 31.
  • This fourth control circuit contains a controller 52, to which the gas temperature downstream of the classifier 32 is supplied by a temperature measuring element 53 as a reference variable for the target value of the gas temperature upstream of the mill 31.
  • the corresponding gas temperature upstream of the mill 31 is set via a motor 54, which acts on the flap 41 arranged in the return air line 40.
  • a fresh air flap (not shown) can of course also be adjusted.
  • the quantity of the material conveyed via the bucket elevator 35 and its grain composition are kept constant by the second control loop. If the amount of the coarse constituents of the comminuted material to be discharged, which falls downward against the gas flow through the nozzle ring, increases, and as a result the power consumption of the bucket elevator 35 increases, the controller 49 increases the gas velocity in the nozzle ring 5 by correspondingly reducing the clear nozzle ring -Section. Accordingly, the gas velocity in the nozzle ring 5 is reduced when the power consumption of the bucket elevator 38 is reduced.
  • the third control circuit comes into operation when the gas speed in the nozzle ring 5 exceeds a predetermined maximum value or falls below a predetermined minimum value.
  • the material feed to the mill 31 is reduced by the controller 51 via the dosing belt scale 36
  • the material feed to the mill is increased.
  • FIG. 5 illustrates the devices for changing the clear cross section of the nozzle ring 5, which is divided into several, separately adjustable segments 5a to 5h. Hydraulic or pneumatic cylinders 12 are used for the adjustment, as was explained in detail with reference to FIGS. 1 to 3. Non-contact displacement transducers 55 are provided to determine the free cross-sectional area of the nozzle ring 5 in the individual segments 5a to 5h.
  • the interaction of the higher-level controller 49 and the downstream controllers 50a, 50b, 50c ... assigned to the individual segments 5a, 5b, 5c ... can be seen from FIG. 6.
  • the higher-level controller 49 receives an actual value (arrow 56) of the current clear cross section of the nozzle ring 5 from a selected segment (for example from segment 5b).
  • the controller 49 receives the setpoint (arrow 57) as a function of the power consumption of the bucket elevator 35.
  • the signal formed by the higher-level controller 49 (arrows 58a, 58b, 58c ...) is then used as the setpoint for the downstream controllers 50a, 50b, 50c. .. supplied, the hydraulically unlockable shut-off valves 59a, 60a, 59b, 60b, 59c, 60c ... actuate the cylinder 12 of the individual segments 5a to 5h.
  • the zero positions of the individual segments can be set differently, i. H. are assigned to a different clear cross-sectional side of the nozzle ring in the area of the individual segments, so that 5 different amounts of gas (corresponding to the different material loading in these peripheral areas) are set in the individual peripheral areas of the nozzle ring.

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

Claims (13)

1. Procédé d'exploitation d'une installation de broyage comprenant :
a) un broyeur à anneau de mouture (3) équipé d'un plateau annulaire de mouture (2) tournant autour d'un axe vertical (1) et coopérant avec des éléments broyeurs (3, 4), ainsi que d'un ajustage fixe en anneau (5) disposé sur le pourtour extérieur du plateau de mouture (2),
b) un séparateur (32) disposé au-dessus du broyeur (31),
c) un ventilateur (33) destiné à produire un courant de gaz chaud passant par l'ajutage en anneau (5) et par le séparateur (32), ce courant saisissant les composants à fines particules de la matière fractionnée et déchargée par-dessus le bord du plateau de mouture (2) et les transportant vers le haut en direction du séparateur (32),
d) un élévateur à godets (35) qui transporte vers le haut les composants à gros grains retombant en passant par l'ajutage en anneau (5) et provenant de la matière fractionnée et déchargée par-dessus le bord du plateau de mouture (2),
e) un premier circuit de réglage étant destiné à maintenir à une valeur constante le débit du courant de gaz chaud passant par le broyeur (31) et le séparateur (32), caractérisé par les particularités suivantes :
f) un second circuit de réglage fait varier la vitesse des gaz dans l'ajutage en anneau (5) en fonction de la consommation d'énergie par l'élévateur à godets (35) de manière que le débit de la matière transportée par cet élévateur ainsi que sa composition granulométrique demeurent constants ;
g) un troisième circuit de réglage réduit l'arrivée de matière au broyeur (31) lorsque la vitesse des gaz dans l'ajutage en anneau (5) dépasse un maximum prédéterminé, ce circuit de réglage' augmentant le débit d'arrivée de matière lorsque la vitesse des gaz passant dans l'ajutage en anneau (5) descend sous un minimum prédéterminé.
2. Procédé selon la revendication 1, caractérisé en ce qu'un quatrième circuit assure le réglage de la température du courant de gaz chaud passant par le broyeur (31) et le séparateur (32) de la manière suivante : la température du gaz à la sortie du séparateur (32) est utilisée en grandeur de référence pour la valeur de consigne de la température du gaz à l'entrée du broyeur (31), la modification de la température du gaz en amont du broyeur s'effectuant de préférence par arrivée d'air frais et/ou d'air recyclé.
3. Procédé selon la revendication 1, caractérisé en ce que la variation de la vitesse du gaz dans l'ajutage en anneau (5) s'effectue par réglage de la position d'une cloison (10) qui délimite la section d'ouverture de l'ajutage en anneau.
4. Procédé selon la revendication 1, caractérisé en ce que les débits de gaz sont réglés de manière à différer dans des zones individuelles de la circonférence (segments 5a à 5h) de l'ajutage en anneau (5) conformément aux différences de la charge en matière de ces zones circonférentielles.
5. Installation de broyage pour la mise en œuvre du procédé selon la revendication 1, comprenant :
a) un broyeur à anneau de mouture (31), qui comprend un plateau annulaire de mouture (2) tournant autour d'un axe vertical (1) et coopérant avec des éléments broyeurs (3, 4), ainsi qu'un ajutage fixe en anneau (5) disposé sur le pourtour extérieur du plateau de mouture (2),
b) un séparateur (32) disposé au-dessus du broyeur (31),
c) un ventilateur (33) destiné à produire un courant de gaz chaud passant par l'ajutage en anneau (5) et par le séparateur (32),
d) un élévateur à godets (35) qui fait remonter les composants à gros grains retombant en passant par l'ajutage (5) et provenant de la matière fractionnée et déchargée par-dessus le bord du plateau de mouture,
e) un premier circuit de réglage destiné à maintenir le débit du courant de gaz chaud passant par le broyeur (31) et par le séparateur (32) à une valeur constante,
caractérisée par :
f) un second circuit de réglage destiné à faire varier la vitesse des gaz dans l'ajutage en anneau (5) en fonction de la consommation d'énergie par l'élévateur à godets (35),
g) un troisième circuit de réglage destiné à modifier le débit d'arrivée de la matière au broyeur (31) lorsque la vitesse des gaz passant dans l'ajutage en anneau (5) dépasse un maximum prédéterminé ou descend sous un minimum prédéterminé.
6. Installation de broyage selon la revendication 5, caractérisée en ce que la position d'au moins une cloison (10) délimitant la section d'ouverture de l'ajutage en anneau (5) est modifiable par l'extérieur en service.
7. Installation de broyage selon la revendication 6, caractérisée en ce que l'ajutage en anneau (5) est subdivisé en plusieurs segments (5a) réglables individuellement.
8. Installation de broyage selon la revendication 7, caractérisée en ce que plusieurs arrivées d'air (20, 21, 22, 23) sont prévues et sont affectées aux segments réglables individuellement (5', 5'b, 5'c, 5'd).
9. Installation de broyage selon la revendication 7, caractérisée en ce que les éléments de cloison (10) délimitant à l'extérieur la section d'ouverture des segments individuels (5a) de l'ajutage en anneau (5) sont déplaçables radialement au moyen d'une commande électrique, hydraulique ou pneumatique (12).
10. Installation de broyage selon la revendication 9, caractérisée en ce que les extrémités des éléments mobiles de cloison (10) qui sont tournées vers les segments voisins sont déplaçables le long de surfaces parallèles (7a, 8a) de guides fixes (7, 8).
11. Installation de broyage selon la revendication 7, caractérisée en ce que l'ajutage en anneau (5) comprend des segments individuels non ventilés entre les segments ventilés et réglables.
12. Installation de broyage selon la revendication 7, caractérisée en ce que des capteurs de déplacement sans contact (55) sont prévus pour déceler la surface de la section d'ouverture de l'ajutage en anneau (5) dans les segments individuels (5a à 5h).
13. Installation de broyage selon la revendication 7, caractérisée par :
a) un régulateur prioritaire (49) qui reçoit sa valeur réelle d'un segment (par exemple 5b) de l'ajutage en anneau (5) et sa valeur de consigne de l'élévateur à godets (35).
b) un régulateur (50a à 50h) affecté aux segments individuels (5a à 5h) de l'ajutage en anneau (5) et qui reçoit sa valeur de consigne du régulateur prioritaire (49) et sa valeur réelle, du segment concerné de l'ajutage.
EP85105567A 1984-05-16 1985-05-07 Procédé pour l'entraînement d'une installation de broyage et dispositif pour l'exécution de ce procédé Expired EP0165429B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3418196A DE3418196A1 (de) 1984-05-16 1984-05-16 Ringmuehle mit verstellbarem duesenring
DE3418196 1984-05-16

Publications (2)

Publication Number Publication Date
EP0165429A1 EP0165429A1 (fr) 1985-12-27
EP0165429B1 true EP0165429B1 (fr) 1986-12-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105567A Expired EP0165429B1 (fr) 1984-05-16 1985-05-07 Procédé pour l'entraînement d'une installation de broyage et dispositif pour l'exécution de ce procédé

Country Status (4)

Country Link
US (1) US4598872A (fr)
EP (1) EP0165429B1 (fr)
DE (2) DE3418196A1 (fr)
ES (1) ES8703297A1 (fr)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
US5090631A (en) * 1990-10-15 1992-02-25 Wark Rickey E Air flow rate control device for pulverizer vane wheel
US5312052A (en) * 1992-06-01 1994-05-17 Dellekamp Michael D Method for reclaiming fiber reinforcement from a composite
DE4223151C2 (de) * 1992-07-14 1994-11-10 Loesche Gmbh Verfahren zur Mahlung von Rohbraunkohle
DE4412197A1 (de) * 1994-04-08 1995-10-19 Loesche Gmbh Verfahren und Einrichtung zum Zerkleinern von Material unterschiedlicher Körnung, insbesondere Luftstrommühle
DE19844112A1 (de) * 1998-09-25 2000-03-30 Loesche Gmbh Schaufelkranz für Luftstrom-Wälzmühlen
DE19844113A1 (de) 1998-09-25 2000-03-30 Loesche Gmbh Schaufelkranz für Luftstrom-Wälzmühlen
US6213415B1 (en) 1999-09-13 2001-04-10 W.R. Grace & Co.-Conn. Process for improving grinding of cement clinker in mills employing rollers
US6409108B1 (en) 2000-12-22 2002-06-25 Sure Alloy Steel Corporation Damage-resistant deflector vane
GB2451457B (en) * 2007-07-31 2010-04-14 Paul Andrew Comer Improvement in relation to grinding mills
CN104759338B (zh) * 2015-03-13 2017-06-13 东莞市美力自动化设备有限公司 自动化研磨机
WO2018016104A1 (fr) * 2016-07-21 2018-01-25 株式会社Ihi Broyeur à rouleaux vertical

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Publication number Priority date Publication date Assignee Title
DE548852C (de) * 1931-06-18 1932-04-20 Ernst Curt Loesche Federrollenmuehle mit Luftstromsichtung
DE719987C (de) * 1938-10-08 1942-04-24 Carbo Union Ind Mij Nv Federrollenmuehle
DE818721C (de) * 1949-05-11 1952-08-04 Ernst Guenter Loesche Federrollenmuehle
AT189039B (de) * 1954-05-18 1957-02-25 Combustion Eng Federrollenmühle
AT254670B (de) * 1964-02-27 1967-06-12 Georg Claes Fa Anlage zum Mahlen eines trockenen bis grubenfeuchten Rohstoffes für die Zementindustrie
DE1238753B (de) * 1964-06-24 1967-04-13 Polysius Gmbh Waelzmuehle
US3730446A (en) * 1971-10-21 1973-05-01 Babcock & Wilcox Co Pulverizing apparatus
US3951347A (en) * 1972-09-21 1976-04-20 Polysius Ag Apparatus for crushing material containing particles that are hard to pulverize
DE3134601C2 (de) * 1981-09-01 1985-10-31 Loesche GmbH, 4000 Düsseldorf Walzen-Schüsselmühle

Also Published As

Publication number Publication date
DE3418196A1 (de) 1985-11-21
DE3560034D1 (en) 1987-02-05
ES8703297A1 (es) 1987-02-16
EP0165429A1 (fr) 1985-12-27
ES543134A0 (es) 1987-02-16
US4598872A (en) 1986-07-08

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