EP0164512B1 - Procédé et installation de broyage - Google Patents

Procédé et installation de broyage Download PDF

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Publication number
EP0164512B1
EP0164512B1 EP85103697A EP85103697A EP0164512B1 EP 0164512 B1 EP0164512 B1 EP 0164512B1 EP 85103697 A EP85103697 A EP 85103697A EP 85103697 A EP85103697 A EP 85103697A EP 0164512 B1 EP0164512 B1 EP 0164512B1
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EP
European Patent Office
Prior art keywords
nozzle ring
constituents
air
mill
coarse
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
EP85103697A
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German (de)
English (en)
Other versions
EP0164512A1 (fr
Inventor
Heinrich Dipl.-Ing. Henne
Lutz Thomas Dipl.-Ing. Schneider
Karl-Heiz Dipl.-Ing. Dammertz
Gotthard Dipl.-Ing. Blasczyk
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
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Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
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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
    • 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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • the invention relates to a grinding method belonging to the state of the art according to the preamble of claim 1 and also to a plant belonging to the state of the art for carrying out this method according to the preamble of claim 9.
  • Ring mills are known in particular in the form of roller mills or ball ring mills.
  • the grinding tools which are designed as balls or rollers, 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, and carries the coarse constituents downward through the nozzle ring against the air flow fall and, for example, are re-fed to the mill via a mechanical conveyor.
  • a grinding method is also known (CH-A-435 940), in which a hammer mill is used for coarse grinding, a tube mill for fine grinding, a sieve for classifying the material discharged from the hammer mill and a centrifugal sifter for classifying the fine fraction obtained during the sieving.
  • the coarse portion of the sieve is returned to the hammer mill.
  • the coarse material accumulating in the centrifugal classifier reaches the tube mill for further crushing, while the fine material of the centrifugal classifier forms the finished product.
  • the invention is based on the object of designing a grinding process of the type required in the preamble of claim 1 (i.e. using an annular mill) in such a way that at least two finished products of different fineness can be produced simultaneously in a simple manner.
  • At least two finished products of different fineness are produced simultaneously using the same ring mill (roller or ball ring mill), for example a fine finished product with a grain size between 0 and 100 microns and a coarse finished product with a grain size of 0.1 to 2 mm.
  • the amount of air and the air speed in the nozzle ring are set so that a pre-classification (caution) takes place in the nozzle ring and the coarse constituents in a defined amount and a certain grain composition precipitate downwards through the nozzle ring.
  • the coarse constituents of the ground material which have precipitated out through the nozzle ring and are conveyed up by means of a mechanical conveying device are then subjected to a reclassification (sieving or screening) in the grinding process according to the invention, at least one partial fraction of the coarse constituents being withdrawn as a further finished product and the remaining fraction containing the coarsest constituents again Mill can be abandoned.
  • the grinding system shown in FIG. 1 contains a roller mill 1 with a static classifier 2 arranged above it, a bucket elevator 3, a sieve device 4 and an electrostatic filter 5.
  • roller mill 1 The details of the roller mill 1, insofar as they are essential for the understanding of the invention, are first explained in more detail with reference to FIGS. 2 and 3.
  • the roller mill 1 schematically illustrated in FIGS. 1 and 2 contains an annular grinding plate 12 rotating about a vertical axis 11, on which two pairs of rollers 13, 14 roll.
  • a stationary nozzle ring 15 which serves to supply an air flow (see arrow 38 in FIG. 3) which detects the fine constituents of the crushed ground material discharged over the edge of the grinding plate 12 and carries it upwards (Arrow 39), while the coarse constituents of the ground material fall downward against the air flow through the nozzle ring 15 (arrow 40).
  • the nozzle ring 15 is divided into several segments, of which the segment 15a is illustrated in detail in FIG.
  • the segment 15a of the nozzle ring 15 contains an inner stationary wall part 16 which is connected to the housing 19 of the roller mill 1 via two lateral guide parts 17, 18.
  • the stationary inner wall part 16 carries a number of webs 16a which point outwards.
  • segment 15a of the nozzle ring 15 contains an outer adjustable wall part 20 which is connected to the push spindle 21 of a pneumatic cylinder 22.
  • the thrust spindle 21 is guided radially in slide guides 23, 24.
  • the pneumatic cylinder 22 is carried by a flange 25 which is fastened to the housing 19 by means of struts 26, 27.
  • the outer wall part 20 of the segment 15a of the nozzle ring 15 is adjustable by means of the spindle 21 of the pneumatic cylinder 22 in the radial direction (double arrow 28), namely between a radially outer position in which the wall part 20 is located near the housing 19 and one Position 20 'indicated by dashed lines, in which the adjustable wall part 20 touches the struts 16a of the stationary inner wall part 16 and in which it limits the clear cross section of the interior 29 of the segment 15a through which the air flows.
  • the adjustable wall part 20 of the segment 15a is guided in the region of the ends facing the adjacent segments on parallel guide surfaces 17a, 18a of the guide parts 17, 18.
  • a link guide can be provided in the area of these guide surfaces 17a, 18a in order to rule out the risk of the adjustable outer wall part 20 tilting with respect to a horizontal plane.
  • the fresh material to be ground from the roller mill 1 is fed in via a conveyor belt 41 and a chute 42.
  • the air supply to the roller mill 1 takes place via a line 43 which is divided into sub-lines 43a, 43b and which is connected to a suitable hot air source.
  • the coarse constituents of the ground material precipitating through the nozzle ring 15 reach the bucket elevator 3 via a line 44 and are fed by this to the screening device 4.
  • At least one partial fraction resulting from the reclassification of the coarse constituents in the sieving device 4 (for example the semolina with a grain size between 0 and 4 mm) is drawn off as the finished product (arrow 45), while the residual fraction containing the coarsest constituents (arrow 46) is returned to the mill 1 is supplied.
  • the fine constituents discharged pneumatically upward from the mill 1 by the air flow are subjected to a sifting in the static sifter 2.
  • the fine constituents leaving the classifier 2 with the air stream are separated in the electrostatic filter 5 as a further finished product (arrow 47).
  • the grains separated in the classifier 2 can be re-fed to the grinding table 12 of the roller mill 1 in the usual way via the separating funnel 48.
  • a selectable portion of this semolina separated in the sifter 2 can be drawn off by a discharge device 49 (for example a screw conveyor) connected to the separating funnel 48 and can also be fed to the bucket elevator 3 via a line 50.
  • a discharge device 49 for example a screw conveyor
  • the diagram according to FIG. 5 explains the relationship between the flow conditions in the nozzle ring and the quantity and fineness of the material falling down through the nozzle ring and conveyed upwards via the bucket elevator.
  • the ordinate of the diagram according to FIG. 5 shows the quantity of material in bucket elevator 3 (expressed as a percentage of the quantity of fresh material to be fed into the mill).
  • the specific air volume in the nozzle ring is plotted on the abscissa of the right part of the diagram (expressed in m 3 / kg fresh material mill feed quantity).
  • the abscissa of the left part of the diagram according to Fig. 5 corresponds to the fineness of the bucket elevator material (expressed in percent residue on a sieve with x mm mesh size). The estate becomes coarser to the left and finer to the right.
  • the two curves in the right part of the diagram show the conditions for two different air velocities V 1 and V 2 in the nozzle ring (where V, ⁇ V 2 ). It can be seen that as the specific amount of air in the nozzle ring increases, the amount of material in the bucket elevator decreases. If the air speed in the nozzle ring increases while the specific air volume remains the same, the amount of bucket material is also reduced.
  • the characteristic curve field in the left part of the diagram is assigned to the two curves in the right part of the diagram.
  • the air velocity prevailing in the nozzle ring is primarily influenced by adjusting the outer wall parts 20 of the nozzle ring
  • the amount of air supplied to the nozzle ring can be influenced, for example, by adjusting a delivery blower and / or by adjusting adjusting flaps provided in the air feeds to the nozzle ring.
  • FIG. 4 shows an embodiment in schematic form, in which four air inlets 60, 61, 62, 63 are provided, to which separately adjustable segments 15'a, 15'b, 15'c and 15'd of a nozzle ring 15 'are assigned.
  • These four segments of the nozzle ring 15 ' have, as in the exemplary embodiment already explained with reference to FIGS. 2 and 3, a wall which is adjustable from the outside during operation and which limits and through the clear cross section of the nozzle ring whose adjustment can thus change the flow conditions of the air in the area of the segment concerned.
  • the devices for adjusting the cross section of the nozzle ring are likewise not illustrated in FIG.
  • adjusting flaps 64 to 67 are provided, which permit a more or less severe throttling of the supplied air streams.
  • the air supplied by the air supply lines 60 to 63 is distributed in the manner schematically indicated by the arrows over the circumferential length of the segments 15'a to 15'd of the nozzle ring 15 '.
  • the circumferential zones of the grinding plate assigned to the individual segments 15'a to 15'd of the nozzle ring 15 ' 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 material discharge or of the coarse material falling downwards against the air flow through the nozzle ring.
  • outer wall parts 20 of the individual segments of the nozzle ring 15 are adjustable by means of pneumatic cylinders 22, within the scope of the invention an adjustment can also be actuated by an electric or hydraulic drive or by means of a handwheel Spindle are provided.
  • the number of elements of the nozzle ring 15, 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.
  • the air speed in the nozzle ring is between 30 and 60 m / s, preferably between 35 and 45 m / s in the grinding process according to the invention.
  • the amount of coarse constituents falling through the nozzle ring and conveyed up again by the mechanical conveying device is 25 to 200%, preferably 30 to 80%, of the amount of the freshly fed material to the mill.
  • the specific amount of air in the nozzle ring is between 0.5 and 4 m 3 / kg, preferably between 0.8 and 2 m 3 / kg, of the material freshly fed to the mill.
  • the coarse constituents falling down through the nozzle ring or the partial fractions obtained in the final classification and used as finished product can, if necessary, be subjected to post-drying, for which purpose, for example, a riser dryer, a spreading dryer or a drying drum can be used.
  • the flow conditions in the nozzle ring can be changed not only in the manner described by adjusting a wall that limits the cross section of the nozzle ring, by adjusting flaps in the air supply lines and by adjusting a delivery blower, but also, for example, by partially covering the nozzle ring or by partial ventilation or partially different ventilation of the nozzle ring.
  • roller mill used for the simultaneous production of at least two finished products within the scope of the grinding process according to the invention can of course also be used in the usual manner for producing a single finished product, the devices for influencing the air quantity and air speed in the nozzle ring allow optimal adaptation of the mill to the prevailing conditions.
  • the specified performance is based on dry product.
  • the feed performance is effectively due to the water contained - depending on the feed moisture, higher.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Air Transport Of Granular Materials (AREA)

Claims (17)

1. Procédé de broyage suivant lequel les composants à grains fins de la matière fractionnée dans un broyeur à anneau de mouture (1) sont déchargés pneumatiquement vers le haut au moyen d'un courant d'air dirigé par un ajutage en anneau (15) et forment un produit fini, tandis que les composants à gros grains retombent en sens inverse du courant d'air en passant par l'ajutage en anneau et sont ramenés vers le haut au moyen d'un convoyeur mécanique (3),
caractérisé en ce que la combinaison des particularités suivantes est prévue pour la fabrication simultanée d'au moins deux produits finis ayant des finesses différentes:
a) le débit et la vitesse de l'air passant dans l'ajutage en anneau (15) sont réglés de manière à produire une préclassification dans cet ajutage et de manière que les composants à gros grains retombent à un débit et avec une composition granulométrique définis en passant par ledit ajutage:
b) les composants à gros grains ramenés vers le haut au moyen du convoyeur mécanique (3) sont soumis à une postclassification, au moins une fraction des composants à gros grains étant soutirée et utilisée également en produit fini.
2. Procédé selon la revendication 1, caractérisé en ce que la fraction résiduelle contenant les composants à grains les plus gros est renvoyée dans le broyeur (1).
3. Procédé selon la revendication 1, suivant lequel les composants à grains fins déchargés pneumatiquement du broyeur (1) vers le haut sont soumis à un tamisage, caractérisé en ce qu'au moins une partie des gruaux provenant de ce tamisage est envoyée à la postclassification avec les composants à gros grains retombant en passant par l'ajutage en anneau (15).
4. Procédé selon la revendication 1, suivant lequel les composants à grains fins déchargés pneumatiquement du broyeur (1) vers le haut sont soumis à une séparation, caractérisé en ce qu'au moins une partie des gruaux provenant de cette séparation est soutirée et également utilisée en produit fini.
5. Procédé selon la revendication 1, caractérisé en ce que les composants à gros grains retombant en passant par l'ajutage en anneau (15) ou la fraction provenant de la postclassification et utilisée en produit fini sont soumis à un séchage complémentaire.
6. Procédé selon la revendication 1, caractérisé en ce que la vitesse de l'air passant par l'ajutage en anneau est comprise entre 30 et 60 m/s, de préférence entre 35 et 45 m/s.
7. Procédé selon la revendication 1, caractérisé en ce que le débit des composants à gros grains retombant en passant par l'ajutage en anneau (15) et remontés par le convoyeur mécanique (3) correspond à 25 à 200 %, de préférence à 30 à 80 % du débit de la matière brute dont le broyeur (1) est chargé.
8. Procédé selon la revendication 1, caractérisé en ce que le débit spécifique d'air passant par l'ajutage en anneau (15) est de 0,5 à 4 m3/kg, de préférence de 0,8 à 2 m3/kg de la matière brute dont le broyeur est chargé.
9. Installation pour la mise en oeuvre du procédé selon la revendication 1, comprenant:
a) un broyeur à anneau de mouture (1) comprenant un plateau de mouture (12) tournant autour d'un axe vertical (11) et sur lequel tournent des éléments broyeurs (13, 14) formés de boulets ou de rouleaux, ledit broyeur comprenant également un ajutage fixe en anneau (15) disposé sur le pourtour extérieur du plateau de mouture (12) et destiné à faire arriver un courant d'air qui saisit les composants à grains fins de la matière fractionnée et déchargée par-dessus le bord du plateau de mouture (12) et les transporte vers le haut, tandis que les composants à gros grains retombent en passant par l'ajutage en anneau (15),
b) un convoyeur mécanique (3) formé de préférence d'un élévateur à godets et destiné à faire remonter les composants à gros grains qui retombent en passant par l'ajutage en anneau (15),
caractérisée par les particularités suivantes:
c) des dispositifs sont prévus pour le réglage du débit et de la vitesse de l'air passant par l'ajutage en anneau (15);
d) un dispositif de postclassification (4) est prévu pour le tamisage ou la séparation des composants à gros grains que fait remonter le convoyeur mécanique (3).
10. Installation selon la revendication 9, dans laquelle un séparateur de préférence statique (2) est disposé au-dessus du broyeur (1), caractérisée en ce qu'un dispositif de décharge (49) destiné à soutirer une fraction optionnelle des gruaux ou du gravier éliminés dans le séparateur (2) est raccordé à la trémie (48) de ce dernier.
11. Installation selon la revendication 9, caractérisée en ce que la position d'au moins une cloison (20) délimitant la section d'ouverture de l'ajutage en anneau (15) est réglable de l'extérieur en service.
12. Installation selon la revendication 10, caractérisée en ce que l'ajutage en anneau (15) est subdivisé en plusieurs segments (15a) réglables individuellement.
13. Installation selon la revendication 11, caractérisée en ce que plusieurs arrivées d'air (60, 61, 62, 63) sont prévues et affectées à des segments réglables individuellement (15'a, 15'b, 15'c, 15'd).
14. Installation selon les revendications 10 et 11, caractérisée en ce que les éléments de cloison (20) délimitant vers l'extérieur la section d'ouverture des segments individuels (15a) de l'ajutage en anneau (15) sont déplaçables radialement au moyen d'une tige filetée pouvant être actionnée par un volant ou au moyen d'une commande électrique, hydraulique ou pneumatique (22).
15. Installation selon la revendication 13, caractérisée en ce que les extrémités des éléments réglables de cloison (20) qui sont tournées vers les segments voisins se déplacent le long de surfaces parallèles (17a, 18a) de guides fixes (17, 18).
16. Installation selon la revendication 10, caractérisée en ce que l'ajutage en anneau (15) comprend des segments individuels non ventilés entre les segments ventilés et réglables.
17. Installation selon la revendication 9, caractérisée en ce que des dispositifs de régulation du débit d'air dirigé sur l'ajutage en anneau (15') sont pévus et consistent de préférence en une soufflante réglable et/ou des clapets de réglage (64, 65, 66, 67) montés dans les arrivées d'air (60, 61, 62, 63) à l'ajutage en anneau.
EP85103697A 1984-05-16 1985-03-27 Procédé et installation de broyage Expired EP0164512B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3418197 1984-05-16
DE19843418197 DE3418197A1 (de) 1984-05-16 1984-05-16 Mahlverfahren sowie mahlanlage

Publications (2)

Publication Number Publication Date
EP0164512A1 EP0164512A1 (fr) 1985-12-18
EP0164512B1 true EP0164512B1 (fr) 1986-12-17

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ID=6236027

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Application Number Title Priority Date Filing Date
EP85103697A Expired EP0164512B1 (fr) 1984-05-16 1985-03-27 Procédé et installation de broyage

Country Status (4)

Country Link
US (1) US4927086A (fr)
EP (1) EP0164512B1 (fr)
DE (2) DE3418197A1 (fr)
ES (1) ES8607055A1 (fr)

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DE4124416A1 (de) * 1991-07-23 1993-01-28 Krupp Polysius Ag Einrichtung und verfahren zur zerkleinerung von mahlgut unterschiedlicher koernung
US5251826A (en) * 1992-03-13 1993-10-12 Pennsylvania Crusher Corporation Tumbling media mill and control system
DK12893A (da) * 1993-02-04 1994-08-05 Smidth & Co As F L Fremgangsmåde til fremstilling af normal såvel som ultrafin cement
US5667149A (en) * 1995-07-03 1997-09-16 Foster Wheeler Energy Corporation Solids pulverizer mill and process utilizing interactive air port nozzles
FR2746329B1 (fr) * 1996-03-22 1998-05-22 Fcb Procede et installation pour la production simultanee et en continu de plusieurs fractions granulometriques d'une matiere minerale
DE19836323C2 (de) 1998-08-11 2000-11-23 Loesche Gmbh Mahlanlage, Anlage zur Herstellung von Zement und Verfahren zur Vermahlung von Rohmaterialien
US6213415B1 (en) 1999-09-13 2001-04-10 W.R. Grace & Co.-Conn. Process for improving grinding of cement clinker in mills employing rollers
FI4856U1 (fi) * 1999-12-08 2001-03-12 Roxon Oy Sovitelma liikkuvassa murskauslaitteessa
DE102011014592A1 (de) * 2011-03-21 2012-09-27 Loesche Gmbh Wälzmühle
CN102861650A (zh) * 2012-09-20 2013-01-09 湖南美鑫有机天然植物科技开发有限公司 强力硬压式甘草磨粉组合机
CN102861655A (zh) * 2012-09-23 2013-01-09 湖南美鑫有机天然植物科技开发有限公司 一种精细甘草粉的硬压式研磨方法
CN104245142A (zh) * 2012-10-17 2014-12-24 德国莱歇公司 用于研磨潮湿物料的方法和装置
DE102014014945A1 (de) * 2014-10-09 2016-04-14 Micro Impact Mill Limited Vorrichtung und Verfahren zum Erzzerkleinern mit einer hydraulischen Federeinrichtung
WO2018016104A1 (fr) * 2016-07-21 2018-01-25 株式会社Ihi Broyeur à rouleaux vertical
CN107803264B (zh) * 2017-11-08 2019-06-18 赵东生 一种扰动增强粉碎与表面改性的设备

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Also Published As

Publication number Publication date
DE3560030D1 (en) 1987-01-29
DE3418197A1 (de) 1985-11-21
EP0164512A1 (fr) 1985-12-18
ES543135A0 (es) 1986-06-01
ES8607055A1 (es) 1986-06-01
US4927086A (en) 1990-05-22

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