EP3618964A1 - Broyeur à rouleaux vertical - Google Patents

Broyeur à rouleaux vertical

Info

Publication number
EP3618964A1
EP3618964A1 EP17735401.6A EP17735401A EP3618964A1 EP 3618964 A1 EP3618964 A1 EP 3618964A1 EP 17735401 A EP17735401 A EP 17735401A EP 3618964 A1 EP3618964 A1 EP 3618964A1
Authority
EP
European Patent Office
Prior art keywords
grinding
bowl
roller mill
vertical roller
mill according
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.)
Granted
Application number
EP17735401.6A
Other languages
German (de)
English (en)
Other versions
EP3618964B1 (fr
Inventor
Jörg LANGEL
Paul Otto
Paul ERWERTH
André BÄTZ
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.)
Loesche GmbH
Original Assignee
Loesche GmbH
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 Loesche GmbH filed Critical Loesche GmbH
Publication of EP3618964A1 publication Critical patent/EP3618964A1/fr
Application granted granted Critical
Publication of EP3618964B1 publication Critical patent/EP3618964B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed

Definitions

  • the invention relates to a vertical roller mill with a rotatable grinding bowl on which a grinding bed of regrind is formed during operation and which has at least two stationary, rotatable grinding rolls which roll on the grinding bed during operation.
  • the ground material is fed by rotation of the grinding bowl around the center of the grinding rollers.
  • the grinding bowl In generic vertical roller mills to be comminuted regrind the grinding bowl is usually abandoned centrally. By rotation of the grinding bowl, the abandoned ground material is transported by centrifugal force from the grinding bowl center towards the edge of the grinding bowl and accelerated in the direction of rotation. The material to be ground is accelerated by the peripheral speed, that is to say the speed of rotation of the grinding bowl. However, since this only happens by friction on the surface, the ground material does not reach the exact circumferential speed or the tangential speed of the grinding bowl at any radius of the grinding bowl.
  • Mahlgutströme Basically, three major Mahlgutströme are present in common vertical roller mills. This is a regrind stream of fresh feed, a regrind stream of rejected classifier grain and a regrind stream from the inner circulation.
  • the fresh regrind is fresh grind added to the milling process.
  • Sizer burrs are the material that is rejected by the sifter in roller mills, for example with integrated sifters.
  • These two regrind streams can be discharged relatively targeted to the center of the grinding bowl, so that ideally can be assumed by the rotation of the grinding bowl of a uniform distribution on the grinding bowl.
  • a constant flow of material is present in the sifter grinder as well as the task of fresh ground material, it happens that over the entire surface of the grinding bowl no necessarily uniform grinding bed is formed.
  • Mahlgutstrom that enters through the inner circulation to take into account.
  • the internal circulation is in particular in vertical roller mills, which are operated in the recirculation mode to material which has fallen over the grinding table and pulled up by the prevailing air flow in the direction of the classifier, but is not completely promoted to the classifier, but already back to the Grinding bowl falls. Also falls down here also directly through the circulating air flow or through existing turbulence away from the grinding plate and again deposited regrind.
  • Another problem is that the surface pressure across the width of the grinding rollers is different for an unequal grinding bed, so that no uniform and optimal comminution takes place.
  • Mahlbettiere Another possibility for setting the Mahlbett way is known from WO 2004/012693 A1.
  • slides are provided, over which the Mahlbettiere can be adjusted.
  • the slides are moved in at different heights on the grinding bed or in the grinding bed and accumulate the material in front of them. So should be adjustable in front of the rollers a grinding bed with a desired height or height distribution.
  • the invention is therefore based on the invention to provide a vertical rolling mill, which has a high degree of smoothness.
  • each device for grinding stock removal is arranged in front of each grinding roller in the direction of rotation of the grinding bowl.
  • Each of these devices for MahlgutabSlen is designed such that a part of the grinding material located on the grinding bowl can be removed before the respective grinding roller of the grinding bowl.
  • a basic idea of the invention lies in the realization that, although regrind is actively removed from the grinding bowl and thus is not fed to the rolls for further grinding, overall more efficient grinding or comminution can be achieved with less expenditure of energy or a higher throughput.
  • the device for MahlgutabClen be performed arbitrarily. It is preferred, however, if the means for AbschgutabClen has a base plate and arranged on the base plate Abtechlkar.
  • the base plate and / or the peeling means are made of ceramic or hard metal or have this / these materials at particularly exposed points in order to reduce the wear resulting from the peeled regrind or passed through under the base plate millbase to reduce.
  • a two-part design has the advantage that only the peeling agent, which has an increased wear in comparison to the base plate, can be replaced individually. Also, the provision of the peeling means on a base plate has the advantage that, in addition to peeling, further smoothing of the grinding bed can be achieved. It is also possible, the device for MahlgutabClen integrally, that is to perform with an integrated base plate or integrated Abwellstoffn.
  • the device for grinding-off peeling has a concave shape on its side facing away from the grinding roll.
  • the peeling-off agent may in particular have a plow-like shape. It has been found that by such a form the ground material can be efficiently removed, in other words, can even be cut off, and the removed Mahlgutstrom can be easily removed from the grinding bowl. Also, the mold offers a relatively low wear, compared to other shapes, given by the shape.
  • the device for Mahlgutfellen is designed such that the grinding material to be removed is conveyed to the outside of the grinding bowl on a grinding bowl edge.
  • the ground material thus removed from the grinding bowl can then be carried either in the direction of the sifter with a recirculating air stream during operation of the mill in recirculation mode, via the internal or an external grinding mill. be returned to the so-called Reject on the grinding bowl or rejected as a grain of the separator and so be led back to the grinding bowl.
  • the device for MahlgutabSlen is designed such that a grinding bed is formed by removing the ground material with a uniform height and / or uniform density or bulk density in front of the grinding roller.
  • a uniform grinding bed with a constant height as possible which is fed to the grinding rollers, they have a quieter run, so that vibrations in the mill can be reduced.
  • the nature of the uniform grinding bed can be seen depending on the exact shape of the grinding bowl and the grinding rolls. If, for example, conical grinding rolls are used with a grinding bowl that is straight or flat in this area, the grinding bed should ideally also be formed parallel to the grinding bowl surface. The situation is different when ball-shaped grinding rolls are used, in which corresponding grinding paths are often formed on the grinding bowl.
  • the grinding bed has a constant or a substantially constant or uniform height.
  • the feature may be understood to mean that the millbase is fed with the millbase having an optimum height and / or density for it and for its contour. This does not necessarily have to be uniform over the entire length or width of the grinding roller.
  • the two terms used in Wälzmühlen grinding plate and grinding bowl are to be regarded as equivalents.
  • the height of the grinding bed after the device for MahlbettabClen may be arbitrary. It is advantageous, if viewed in the direction of rotation of the grinding bowl, to be larger in front of the grinding roll than the grinding gap between the grinding roll and the grinding roll. Bowl is. In other words, this ensures that sufficient material is present to be comminuted by the roller in the grinding gap. This comminution takes place by applying or introducing pressure of the roller in the direction of the grinding bowl. If the Mahlbettiereiere before the grinding roller amount only to the height of the grinding gap, so would not be ground sufficiently ground. What is important here is the difference between the bulk density prior to entry into the grinding gap and the maximum compression density in the grinding gap, wherein the Mahlbettiereiereiereiere before roll and in the gap behave proportional to the respective densities.
  • the device for MahlgutabSlen is designed to be height adjustable.
  • the height of the device can be adjusted over the grinding bowl, whereby the height of the grinding bed can be varied.
  • the height at which the millbase is fed to the grinding roller can thus be varied, as a result of which an optimization to the respective process can be carried out.
  • the MahlgutabClen device may extend over part of the width or over the entire width of the grinding rollers.
  • the means for AbschgutabClen does not extend over the entire width of the grinding roller and so a part of a non-smoothed grinding bed of the grinding roller is supplied.
  • the grinding bowl on a storage area which serves to damming of the Mahlschüssel congresss to the edge of the grinding bowl by rotation of these transported ground material. It is preferred if the Device for AbschgutabClen extending from the storage area of the grinding bowl in the direction of the center of the grinding bowl along the width of the grinding rolls.
  • the MahlgutabClen means may be arranged obliquely with respect to the rotational direction of the grinding bowl. In this case, it preferably has a greater distance to the grinding bowl surface on the side facing away from the grinding roll than on the side facing the grinding roll.
  • the device for MahlgutabClen in particular their base plate, obliquely on the grinding bed, so that a pre-compression can be performed.
  • the pre-compression serves essentially to remove air which is in the grinding bed from this, so that the grinding roller can already be offered a precompressed grinding bed, which vibrations and vibrations that arise on the grinding roller and intercepted by their suspension, reduced are.
  • a quieter running of the mill is achieved, which in turn allows an increased rotational speed of the grinding bowl and the efficiency and throughput can be increased.
  • the device for MahlgutabSlen extends to the grinding gap and even extends within the surface of the vertical projection of the grinding roller. This can be achieved, in particular, by a base plate that extends as far as the grinding gap or until just before it.
  • the fact that the device for MahlgutabClen or their base plate until shortly extends before the refining gap it can be achieved that with a relatively high degree of safety, a uniform grinding bed the Mahlspalt and thus the grinding roller is supplied.
  • the grinding bed when used with preparation rollers, the grinding bed would be precompressed comparatively far in advance of the grinding rolls in comparison to this embodiment, disturbances in the grinding bed would again result on the transport path from precompression to the actual grinding rolls, which would bring about a more restless running.
  • the device for MahlgutabClen extends far within the surface of the vertical projection of the grinding rollers on the grinding bowl to achieve the smallest possible distance between the grinding gap and the device for MahlgutabClen.
  • a better venting of the material to be ground can also be achieved by providing fin on the underside of the device for grinding stock removal, in particular on the base plate, into the grinding bed, which extend substantially in the direction of rotation of the grinding bowl. These fins or projections form notches in the grinding bed, which is ideally also supplied to the grinding roller.
  • the air escaping from the millbase in the grinding gap by the pressure of the grinding roller on the grinding bowl is offered a way from which it can escape from the millbase. This in turn leads, as it comes to no sudden venting of the grinding bed more but a continuous escape, a quieter run of the vertical roller mill, which in turn can be operated at a higher speed and thus a higher throughput.
  • the water or other fluids are injected directly into the grinding bed.
  • the penetration depth of the fluid can be influenced, so that with less water consumption, a more compact and better to be comminuted grinding bed can be produced.
  • the lower water consumption represents an energetic advantage because less water must evaporate during the mill drying.
  • Fig. 1 a side view of a grinding roller with a device according to the invention for MahlgutabSlen;
  • Fig. 2 is a view according to II of Fig. 1;
  • FIG. 3 is a plan view of a grinding roller with a device according to the invention for Mahlabtechlen;
  • Fig. 4 a side view of a grinding roller with a device according to the invention for MahlgutabSlen;
  • Fig. 5 is a view according to V of Fig. 4;
  • Fig. 6 a side view of a grinding roller with a device according to the invention for MahlgutabSlen with water injection;
  • Fig. 7 an enlarged view of a nozzle for water injectors.
  • a grinding roller 4 is shown on a grinding bowl 3 in a schematic representation, wherein further a device according to the invention for MahlgutabSlen 10 is shown.
  • the grinding bowl 3 rotates in the direction of rotation 8. Most of the grinding bowl 3 is circular. In their middle ground material 20 is abandoned, which is moved or conveyed by the rotation of the grinding bowl 3 and resulting fly forces to the outside. As a result, a grinding bed 20 is formed on the grinding bowl 3. As a result of the rotation of the grinding bowl 3, the grinding stock 2 of the grinding roll ze 4 fed and comminuted in its grinding gap 5 by the pressure of the grinding roller 4 and possibly additional pressure on the grinding roller 4.
  • the grinding bed 20 is often formed unevenly. This results in time significantly different forces that occur on the grinding roller 4 when rolling on the grinding bed 20. These forces can be intercepted in part by a suspension system of the grinding roller 4, but also provide from a certain strength to a so-called vibration of the grinding roller 4 and the entire system, that is the vertical roller mill, in which the grinding bowl 3 is located with a plurality of grinding rollers 4. Once a vibration occurs, the rotational speed 8 of the grinding bowl 3 can not be further increased, whereby the throughput can not be increased.
  • a grinding plant is often designed for a constant rotational speed of the grinding bowl. Occurring vibrations thus represent an upper limit for throughput and / or fineness of the ground material. This means that one can not achieve the desired values in a system or the throughput and / or the fineness can not be further increased. However, if the use of grinding regrind leads to reduced vibrations in terms of process engineering, new systems could be planned and delivered right from the start with higher grinding bowl speeds and therefore higher throughputs.
  • the device according to the invention for MahlgutabClung 10 is used. This is located in the direction of rotation 8 of the grinding bowl 3 in front of the grinding roller 4.
  • the device for MahlgutabClen 10 of two essential components which may be made in two parts, but may also be in one piece.
  • a AbMlkar 14 is provided, the regrind 22, which is piled higher than the height hi in the grinding bed 20, away from the grinding bed 20 in other words peels off.
  • a base plate 12 is provided, on which the Abrobolatori 14 is attached.
  • the base plate 12 extends as far as possible in the direction of the grinding gap 5 between the grinding roller 4 and the grinding bowl 3. As the grinding gap 5, the point or area can be considered at which the grinding roller 4 has its smallest distance to the grinding bowl 3.
  • the base plate 12 and thus also the device for MahlgutabClen 10 may extend substantially parallel to the grinding bowl 3 on its underside. However, it is also possible that the device for MahlgutabClen 10 is arranged slightly inclined so that it has on the side facing away from the grinding roller 4 a greater distance hi to the top of the grinding bowl 3, as on the grinding roller 4 side facing. In Fig. 1, this distance is referred to as h 2 .
  • the material to be ground 22 which forms the grinding bed 20, slightly precompressed. This means in particular that it is vented. This is understood to mean that air which is located in the grinding bed 20 due to the loose bedding of the ground material 22 is removed from the grinding bed 20 and a denser packing of the particles is produced. This in turn also leads to a more uniform force loading of the grinding roller 4, whereby a quieter run is achieved.
  • the means for peeling 14 is formed like a plow. In connection with Fig. 2, this is apparent again. It has proved to be an advantage here if the means 14 for this purpose has a concave shape, which is preferably designed such that it conveys the peeled grinding material 23 to the outside of the grinding bowl 3 on the Mahlschüsselrand addition.
  • the device for MahlgutabClen is flexibly suspended, so that both the height hi and the height h 2 can be adjusted. This is preferred since 22 different heights hi, h 2 are optimal, depending on the throughput and grinding stock used. However, it is essential here that the height h 2 always has a greater height than the grinding gap 5 with its height h 3 . Otherwise, it would lead to a reduced throughput of the ground material 22.
  • FIG. 2 which shows a view according to II from FIG. 1, further advantages of the apparatus according to the invention for grinding stock peeling 10 will be discussed.
  • a storage edge 6 at the edge of the grinding bowl 3 is visible. At this accumulates from the center of the grinding bowl 3 to the outside in the direction of the edge of the grinding bowl 3 running ground 22 and there is a slope 25, which is also referred to as Mahlgutzwickel. Similarly, a slope or embossment 25 is in the direction of the center of the grinding bowl 3, since here the material 22 is abandoned and is carried only by the rotation to the outside to the edge of the grinding bowl 3 and is distributed therewith.
  • the device for MahlgutabClen 10 starts close to the Staurand 6. This makes it possible to remove the Mahlgutzwickel 25 on the storage edge 6 and so remove the accumulation of the grinding bed 20, so that the grinding roller 4 as evenly as possible and homogeneously formed grinding bed 20 is provided for rolling over.
  • FIGS. 3, 4, and 5 a further embodiment of the apparatus for grinding stock peeling 10 according to the invention will now be discussed.
  • a plan view of the grinding roller 4 is shown in FIG. 4 shows a side view of the grinding roller 4 with the device according to the invention for MahlbettabClen 10.
  • Fig. 5 is a view corresponding to V of Fig. 4 is shown.
  • fin-like projections 16 are provided on the underside of the base plate 12, which are pressed into the grinding bed 20. These projections 16 thus press Gutausweichrillen 31 in the grinding bed 20. These serve to ensure that during the compression of the grinding bed 20 in the grinding gap 5, the air that is displaced so can escape. In this context, it is important that, so that the resulting Heilausweichrillen 31 are not refilled with regrind 22, the means for MahlgutabSlen 10 and the fin 16 or fin-like protrusions zoom as far as possible to the grinding gap 5, but shortly before end to the to give way to escaping air. In a further embodiment, it is also possible the fin-like projections 16 hollow inside and with Channels that end above the base plate outdoors to purge the air targeted.
  • FIG. 7 shows an enlarged view of a nozzle 25 for a water injection, which is provided in this embodiment.
  • one or more nozzles 35 are provided in the base plate 12, which are connected to a feed line 37. Via this feed line 37, a fluid, in particular water, can be introduced directly into the grinding bed 20. This serves, inter alia, to further displace the remaining air and to increase the density of the grinding bed.
  • the water injection is a known means to prevent or reduce vibrations in the operation of a vertical roller mill. It is advantageous in the embodiment shown here that can be ensured by the direct injection of water into the grinding bed 20, that the water enters the grinding bed 20 without significant losses.
  • a ceramic armor 33 is indicated in the embodiments shown here, which serves to minimize the wear of the base plate 12 and the AbJelffens 14.

Landscapes

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

Abstract

L'invention concerne un broyeur à rouleaux vertical comportant une cuve de broyage rotative sur laquelle, lors du fonctionnement, un lit de broyage est formé à partir du produit à broyer. En outre, ledit broyeur à rouleaux vertical comporte au moins deux rouleaux de broyage stationnaires et rotatifs, qui, lors du fonctionnement, roulent sur le produit à broyer, le produit à broyer étant alimenté au rouleau de broyage par rotation de la cuve de broyage. Selon l'invention, un dispositif d'écorçage du produit à broyer est disposé en amont de chaque rouleau de broyage et une partie du produit à broyer écorcé est enlevée en amont du rouleau de broyage.
EP17735401.6A 2017-06-13 2017-06-13 Broyeur à rouleaux vertical Active EP3618964B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/064410 WO2018228675A1 (fr) 2017-06-13 2017-06-13 Broyeur à rouleaux vertical

Publications (2)

Publication Number Publication Date
EP3618964A1 true EP3618964A1 (fr) 2020-03-11
EP3618964B1 EP3618964B1 (fr) 2020-08-05

Family

ID=59285146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17735401.6A Active EP3618964B1 (fr) 2017-06-13 2017-06-13 Broyeur à rouleaux vertical

Country Status (6)

Country Link
EP (1) EP3618964B1 (fr)
JP (1) JP6894986B2 (fr)
CN (1) CN110799269A (fr)
AR (1) AR112136A1 (fr)
DK (1) DK3618964T3 (fr)
WO (1) WO2018228675A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3909682B1 (fr) * 2020-05-14 2022-04-06 Gebr. Pfeiffer SE Procédé et broyeur à rouleaux permettant l'activation thermomécanique d'un mélange d'argiles
CN113198606B (zh) * 2021-04-27 2023-10-24 烟台卫康动物保健品有限公司 一种生物制药业辅助研磨装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118457B (en) * 1982-04-13 1985-05-22 Smidth & Co As F L Edge runner mills
DD258325A3 (de) * 1986-03-10 1988-07-20 Ruedersdorf Zementwerke Verfahren zur beeinflussung des fertigproduktes bei der zerkleinerung in waelzmuehlen
DE3921986C1 (fr) * 1989-07-04 1990-10-25 Loesche Gmbh, 4000 Duesseldorf, De
JPH03127637A (ja) * 1989-10-11 1991-05-30 Babcock Hitachi Kk 竪形ローラ式微粉砕機およびその運転方法
JPH10230179A (ja) * 1997-02-18 1998-09-02 Kawasaki Heavy Ind Ltd 竪型ローラミルによるセメントクリンカの粉砕方法および装置
US6193176B1 (en) * 1997-02-18 2001-02-27 Kawasaki Jukogyo Kabushiki Kaisha Cement clinker grinding method using vertical roller mill and apparatus
JP2000140663A (ja) * 1998-11-09 2000-05-23 Babcock Hitachi Kk ローラミル
BR0313249B1 (pt) 2002-08-05 2014-04-22 Colgate Palmolive Co Composição dentária para eliminar ou reduzir o desconforto e a dor associados com a hipersensibilidade dentinária
JP4288650B2 (ja) * 2002-10-07 2009-07-01 宇部興産機械株式会社 竪型粉砕機
DE102010010752A1 (de) 2010-03-09 2011-09-15 Loesche Gmbh Wälzmühle
CN103379961B (zh) * 2010-12-16 2015-11-25 德国莱歇公司 用于研磨材料的方法和辊磨机
CN103480460B (zh) * 2013-10-15 2015-08-12 南京西普水泥工程集团有限公司 一种磨机料层稳定装置
CN204247345U (zh) * 2014-09-17 2015-04-08 上海世邦机器有限公司 一种生料立磨预压实铺料装置
JP6656805B2 (ja) * 2014-12-22 2020-03-04 川崎重工業株式会社 竪型ローラミル
CN106563534A (zh) * 2016-11-22 2017-04-19 合肥中亚建材装备有限责任公司 一种犁式立磨料层塑形排气装置

Also Published As

Publication number Publication date
CN110799269A (zh) 2020-02-14
AR112136A1 (es) 2019-09-25
WO2018228675A1 (fr) 2018-12-20
JP6894986B2 (ja) 2021-06-30
EP3618964B1 (fr) 2020-08-05
JP2020523192A (ja) 2020-08-06
DK3618964T3 (da) 2020-11-02

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