EP3618964B1 - Vertikalwälzmühle - Google Patents

Vertikalwälzmühle Download PDF

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Publication number
EP3618964B1
EP3618964B1 EP17735401.6A EP17735401A EP3618964B1 EP 3618964 B1 EP3618964 B1 EP 3618964B1 EP 17735401 A EP17735401 A EP 17735401A EP 3618964 B1 EP3618964 B1 EP 3618964B1
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EP
European Patent Office
Prior art keywords
grinding
bowl
roller
mill
bed
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.)
Active
Application number
EP17735401.6A
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German (de)
English (en)
French (fr)
Other versions
EP3618964A1 (de
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
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Loesche GmbH
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Publication of EP3618964A1 publication Critical patent/EP3618964A1/de
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Publication of EP3618964B1 publication Critical patent/EP3618964B1/de
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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
    • 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 rollers which roll on the grinding bed during operation.
  • the ground material is fed to the grinding rollers by rotating the grinding bowl around its center.
  • the ground material to be comminuted is usually fed into the grinding bowl centrally.
  • the ground material is transported by centrifugal force from the center of the grinding bowl towards the edge of the grinding bowl and accelerated in the direction of rotation.
  • the millbase is accelerated by the peripheral speed, i.e. the speed of rotation of the grinding bowl.
  • the ground material does not reach the exact circumferential speed or the tangential speed of the grinding bowl on any radius of the grinding bowl.
  • the fresh regrind is regrind freshly added to the grinding process.
  • Sifter size is the material that is rejected by the sifter in roller mills, for example with integrated sifters.
  • These two grist streams can be delivered to the center of the grinding bowl in a relatively targeted manner, so that, ideally, the rotation of the grinding bowl assumes a uniform distribution on the grinding bowl.
  • there is not always a constant flow of material, especially in the classifier grit and when feeding fresh regrind it does not always occur that a uniformly uniform grinding bed is formed over the entire surface of the grinding bowl.
  • the internal circulation is, in particular, vertical roller mills that are operated in recirculating air mode, material that has fallen over the grinding plate and is pulled up in the direction of the classifier by the prevailing air flow, but is not conveyed completely to the classifier, but back to the classifier beforehand Grinding bowl falls.
  • This also includes the regrind that is carried away and deposited again by the circulating air flow or by the turbulence present in it.
  • the grinding rollers are not supplied with a uniform flow of regrind with a uniform grinding bed, but that the rollers have to be continuously adapted to the different grinding bed heights by means of hydraulic damping.
  • Another problem is that the surface pressure is different across the width of the grinding rollers in the case of an unequal grinding bed, so that no uniform and optimal comminution takes place.
  • additional preparation rollers are provided in front of the actual grinding rollers, which cause the ground material to be pre-compacted on the grinding bowl. This is intended to ensure that part of the air present in the grinding bed due to the loose filling is already removed from the grinding bed and, in addition, there is a more uniform height of the grinding bed when it enters the grinding gap between the actual grinding roller and the grinding bowl.
  • Another option for setting the grinding bed height is from the WO 2004/012693 A1 known.
  • slides are provided in the area in front of the grinding rollers, via which the grinding bed height can be adjusted.
  • the slides are inserted at different heights over the grinding bed or into the grinding bed and accumulate the material in front of them.
  • a grinding bed with a desired height or height distribution should be adjustable in front of the rollers.
  • the US4489895A shows according to the preamble of claim 1 a vertical roller mill with a scratch in front of each roller in the direction of rotation.
  • the invention is therefore based on the object of providing a vertical roller mill which is very quiet in operation.
  • one device for peeling the regrind is arranged in front of each grinding roller in the direction of rotation of the grinding bowl.
  • Each of these devices for peeling the regrind is designed such that part of the regrind on the grinding bowl can be removed from the grinding bowl in front of the respective grinding roller.
  • a basic idea of the invention lies in the knowledge that, although regrind is actively removed from the grinding bowl and is therefore not fed to the rollers for further grinding, overall more efficient grinding or comminution can be achieved with less energy expenditure or a higher throughput.
  • the device for peeling the regrind actively removes regrind from the grinding bowl.
  • the ground material not to be dammed up in any way on the grinding bowl or to be compressed differently by compression.
  • the grinding roller can be provided with a very even flow of regrind.
  • Uniform in the sense of the invention can be understood in particular to mean both a uniform grinding material height and a similar compression, that is to say density of the grinding material on the grinding bed. A similar density is achieved in particular by an identical or similar pre-compression.
  • This uniformity means that the entire vertical roller mill system can be operated at a higher throughput.
  • the existing one Throughput and performance limits lifted or moved to higher values.
  • the device for peeling regrind can be designed as desired. It is preferred, however, if the device for peeling regrind has a base plate and a peeling agent arranged on the base plate.
  • the base plate and / or the peeling agent are advantageously made of ceramic or hard metal or have this / these materials at particularly exposed locations in order to reduce the wear that results from the peeled ground material or the ground material passed under the base plate.
  • a two-part design has the advantage that only the peeling agent, which has increased wear compared to the base plate, can be replaced individually.
  • Providing the peeling agent on a base plate also has the advantage that, in addition to peeling, a further smoothing of the grinding bed can be achieved. It is also possible to design the device for peeling regrind in one piece, that is to say with an integrated base plate or integrated peeling means.
  • Efficient removal or discharge of the ground material from the grinding bowl can be achieved in particular if the device for peeling the ground material has a concave shape on its side facing away from the grinding roller.
  • the peeling agent can in particular have a plow-like shape. It has been found that with such a shape, the millbase can be efficiently removed, in other words, can even be cut off, and the millbase stream which has been removed can be easily removed from the grinding bowl.
  • the shape also offers, compared to other shapes, relatively little wear, which is given by the shape.
  • the device for peeling the regrind is designed such that the regrind to be removed is conveyed outside the grinding bowl via a grinding bowl edge.
  • the regrind removed from the grinding bowl in this way can then be carried either with a circulating air flow when operating the mill in the circulating air mode in the direction of the classifier, via the internal or an external grinding circuit the so-called reject can be traced back to the grinding bowl or rejected as greetings by the classifier and thus returned to the grinding bowl.
  • pneumatic conveying back to the grinding bowl is also possible, for example together with feed material or separately therefrom. Wiping off the excess ground material from the grinding bowl to the outside of the grinding bowl has also proven to be the most energy-efficient method for removing the excess ground material.
  • the device for peeling the regrind is designed such that, by removing the regrind, a grinding bed with a uniform height and / or uniform density or bulk density is formed in front of the grinding roller. Due to a uniform grinding bed with a height that is as constant as possible, which is fed to the grinding rollers, they have a smoother run, so that vibrations in the mill can be reduced.
  • the type of uniform grinding bed depends on the exact shape of the grinding bowl and the grinding rollers. If, for example, conical grinding rollers with a straight or flat grinding bowl are used in this area, the grinding bed should ideally also be formed parallel to the grinding bowl surface. The situation is different when spherical grinding rollers are used, in which corresponding grinding tracks are often formed on the grinding bowl.
  • the grinding bed has a constant or an essentially constant or uniform height.
  • the feature can be understood in such a way that the regrind is fed the regrind at a height and / or density that is optimal 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 grinding plate and grinding bowl used in roller mills are to be regarded as equivalents.
  • the height of the grinding bed after the device for peeling the grinding bed can be any. It is advantageous if, viewed in the direction of rotation of the grinding bowl, it is larger in front of the grinding roller than the grinding gap between the grinding roller and the grinding bowl is. In other words, this ensures that sufficient material is available to be crushed by the roller in the grinding gap. This comminution takes place by applying or applying pressure from the roller in the direction of the grinding bowl. If the height of the grinding bed in front of the grinding roller were only the height of the grinding gap, not enough ground material would be ground. What is important here is the difference between the bulk density before it is drawn into the grinding gap and the maximum compression density in the grinding gap, the grinding bed height in front of the roller and in the gap being proportional to the respective densities.
  • the device for peeling regrind is designed to be height-adjustable.
  • the height of the device above the grinding bowl can be adjusted, whereby the height of the grinding bed can also be varied.
  • the height at which the ground material is fed to the grinding roller can thus be varied, so that an optimization can be carried out for the respective process.
  • the device for peeling the regrind can extend over part of the width or over the entire width of the grinding rollers.
  • the device for peeling the grinding material does not extend over the entire width of the grinding roller and thus part of an unsmoothed grinding bed is also fed to the grinding roller.
  • this reduces the effort and the force which acts on the device for peeling the regrind, as a result of which it has to be made less stable and also has less wear.
  • This also has the advantage that in the area of the grinding rollers not covered by the device for peeling the regrind, regrind particles can be drawn in and comminuted which have a larger diameter than the distance between the device for peeling the regrind and the grinding bowl.
  • the grinding bowl has a storage edge which serves to accumulate the ground material transported from the center of the grinding bowl to the edge of the grinding bowl by rotating it. It is preferred if the Milling material peeling device extends from the storage edge of the grinding bowl in the direction of the center of the grinding bowl along the width of the grinding rollers.
  • an embankment of regrind is often formed on it, which is significantly higher than the rest of the grinding bed.
  • This slope can be removed by means of the device for peeling the regrind by removing it from the grinding bowl.
  • This embankment in particular, as it has a significantly higher height than the rest of the grinding bed, can lead to uneven wear on the grinding rollers.
  • the fact that the device for peeling the regrind removes the embankment means that the wear of the grinding rollers becomes significantly more uniform over the entire width of the grinding rollers.
  • the embankment must be transformed into a vertical section when it is drawn into the nip from an imaginary triangle to an imaginary rectangle. The energy consumed by this can be significantly reduced by using the plow, as experiments have shown.
  • the device for peeling regrind can be arranged obliquely with respect to the direction of rotation of the grinding bowl. In this case, it is preferably at a greater distance from the grinding bowl surface on the side facing away from the grinding roller than on the side facing the grinding roller.
  • the device for peeling the regrind in particular its base plate, lies obliquely on the grinding bed, so that pre-compaction can be carried out.
  • the pre-compression essentially serves to remove air from the grinding bed, so that the grinding roller can already be offered a pre-compressed grinding bed, which reduces oscillations and vibrations that occur on the grinding roller and must be absorbed by its suspension are. As a result, the mill runs more smoothly, which in turn enables an increased rotational speed of the grinding bowl and the efficiency and the throughput can be increased.
  • the device for peeling regrind 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 extending up to the grinding gap or shortly before.
  • the fact that the device for peeling regrind or its base plate up to short extends in front of the grinding gap it can be achieved that a uniform grinding bed is fed to the grinding gap and thus to the grinding roller with a relatively high degree of certainty. If, for example when using preparation rollers, the grinding bed were pre-compressed relatively far in front of the grinding rollers compared to this version, there would again be malfunctions in the grinding bed on the transport route from the pre-compression to the actual grinding rollers, which would result in a more restless run.
  • the device for peeling the grinding material extends far within the area of the vertical projection of the grinding rollers onto the grinding bowl in order to achieve the smallest possible distance between the grinding gap and the device for peeling the grinding material.
  • a better ventilation of the ground material can also be achieved by providing fins which extend into the grinding bed and extend essentially in the direction of rotation of the grinding bowl on the underside of the device for peeling the ground material, in particular on the base plate. These fins or projections form notches in the grinding bed, which ideally is also fed to the grinding roller.
  • the air escaping from the material to be ground 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 material to be ground. This in turn leads to the fact that there is no sudden venting of the grinding bed, but instead a continuous escape, to a quieter running 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 also be influenced with the pressure of the injection, so that an even more compact and easier to grind grinding bed can be produced with less water consumption.
  • the lower water consumption represents an energetic advantage because less water has to evaporate during the milling drying.
  • a grinding roller 4 is shown in a schematic representation on a grinding bowl 3, a device according to the invention for peeling the regrind 10 also being shown.
  • the grinding bowl 3 rotates in the direction of rotation 8. Usually, the grinding bowl 3 is circular. In the middle, regrind 20 is fed in, which is moved or conveyed to the outside by the rotation of the grinding bowl 3 or the resulting flying forces. As a result, a grinding bed 20 is formed on the grinding bowl 3.
  • the material to be ground 2 becomes the grinding roller by the rotation of the grinding bowl 3 4 fed and crushed 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 of non-uniform design. This results in significantly different forces in time, which 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 a so-called vibration of the grinding roller 4 or the entire system, i.e. the vertical roller mill, in which the grinding bowl 3 with several grinding rollers 4 is located, from a certain strength. As soon as vibrations occur, the rotational speed 8 of the grinding bowl 3 can no longer be increased, as a result of which the throughput can no longer be increased.
  • a grinding plant is often designed for a constant rotational speed of the grinding bowl. Vibrations that occur therefore represent an upper limit for the throughput and / or fineness of the ground material. This means that the desired values cannot be achieved in a system or the throughput and / or fineness cannot be increased further. However, if the use of regrind peeling leads to reduced vibrations in terms of process technology, new systems could be planned and delivered from the start with higher grinding bowl speeds and thus higher throughputs.
  • the device according to the invention for peeling the regrind 10 is used. This is in the direction of rotation 8 of the grinding bowl 3 in front of the grinding roller 4.
  • the device for peeling the regrind 10 consists of two essential components which can be made in two parts, but can also be in one part.
  • a peeling agent 14 is provided, which in other words removes the regrind 22, which is poured higher than the height h 1 in the grinding bed 20, from the grinding bed 20. This is clear in Fig. 2 shown, from which it appears that the removed regrind 23 is conveyed to the outside of the grinding bowl 3.
  • a base plate 12 is provided on which the peeling agent 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.
  • the point or area at which the grinding roller 4 is at its smallest distance from the grinding bowl 3 can be regarded as the grinding gap 5.
  • the base plate 12 and thus also the device for peeling the ground material 10 can run essentially parallel to the grinding bowl 3 on its underside.
  • the device for peeling the regrind 10 it is also possible for the device for peeling the regrind 10 to be arranged at a slight incline, so that it is at a greater distance h 1 to the top of the grinding bowl 3 on the side facing away from the grinding roller 4 than on the side facing the grinding roller 4. In Fig. 1 this distance is referred to as h 2 .
  • the ground material 22 which forms the grinding bed 20 is slightly pre-compressed. 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 filling of the material to be ground 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 even force load on the grinding roller 4, as a result of which a smoother running is achieved.
  • the means for peeling 14 is designed like a plow. Combined with Fig. 2 this emerges again. It has proven to be an advantage here if the means 14 has a concave shape for this purpose, which is preferably designed such that it transports the peeled ground material 23 outside the grinding bowl 3 beyond the edge of the grinding bowl.
  • the device for peeling the regrind is suspended flexibly, so that both the height h 1 and the height h 2 can be set. This is preferred since 22 different heights h 1 , h 2 are optimal, depending on the throughput and regrind used. It is essential here, however, 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 a view according to II Fig. 1 shows, discussed further advantages of the device according to the invention for peeling regrind 10.
  • a storage edge 6 on the edge of the grinding bowl 3 is visible.
  • the regrind 22 running from the center of the grinding bowl 3 to the outside in the direction of the edge of the grinding bowl 3 is jammed and a slope 25 is formed, which is also referred to as a grist reel.
  • a bulge or embankment 25 in the direction of the center of the grinding bowl 3 since here the material 22 is given up and is only carried to the edge of the grinding bowl 3 by the rotation outwards and is thus distributed.
  • the device for peeling the regrind 10 begins close to the accumulation edge 6. This makes it possible to remove the reel 25 from the accumulation edge 6 and thus remove the accumulation from the grinding bed 20, so that the grinding roller 4 has a grinding bed 20 which is as uniform and homogeneous as possible is made available for rolling over.
  • FIG. 3 shows a plan view of the grinding roller 4 is shown.
  • FIG. 4 shows a side view of the grinding roller 4 with the device for peeling the grinding bed 10 according to the invention
  • Fig. 5 a view corresponding to V. Fig. 4 shown.
  • fin-like projections 16 are provided on the underside of the base plate 12 and are pressed into the grinding bed 20. These projections 16 thus press air escape grooves 31 into the grinding bed 20. These serve to allow the air which is displaced in this way to escape when the grinding bed 20 is compressed in the grinding gap 5.
  • the device for peeling regrind 10 or the fins 16 or fin-like projections extend as far as possible to the grinding gap 5, but end shortly before that leaving space for escaping air.
  • the fin-like projections 16 it is also possible for the fin-like projections 16 to be hollow on the inside and with Provide channels that end above the base plate in the open in order to discharge the air in a targeted manner.
  • FIG. 6 again shows a side view of the grinding roller 4.
  • FIG. 7 shows an enlarged view of a nozzle 25 for 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.
  • a fluid in particular water, can be introduced directly into the grinding bed 20 via this feed line 37. Among other things, this serves to further displace the air still present and to increase the density of the grinding bed.
  • Water injection is a known means of preventing or reducing vibrations during the operation of a vertical roller mill. It is advantageous in the embodiment shown here that the direct injection of the water into the grinding bed 20 can ensure that the water gets into 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 peeling agent 14.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
EP17735401.6A 2017-06-13 2017-06-13 Vertikalwälzmühle Active EP3618964B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/064410 WO2018228675A1 (de) 2017-06-13 2017-06-13 Vertikalwälzmühle

Publications (2)

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

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EP17735401.6A Active EP3618964B1 (de) 2017-06-13 2017-06-13 Vertikalwälzmühle

Country Status (6)

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EP (1) EP3618964B1 (da)
JP (1) JP6894986B2 (da)
CN (1) CN110799269A (da)
AR (1) AR112136A1 (da)
DK (1) DK3618964T3 (da)
WO (1) WO2018228675A1 (da)

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Publication number Priority date Publication date Assignee Title
EP3909682B1 (de) * 2020-05-14 2022-04-06 Gebr. Pfeiffer SE Verfahren und wälzmühle zum thermomechanischen aktivieren eines tongemischs
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

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DE3921986C1 (da) * 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
US6193176B1 (en) * 1997-02-18 2001-02-27 Kawasaki Jukogyo Kabushiki Kaisha Cement clinker grinding method using vertical roller mill and apparatus
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
JP2000140663A (ja) * 1998-11-09 2000-05-23 Babcock Hitachi Kk ローラミル
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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
EP2637790B1 (de) * 2010-12-16 2014-05-07 Loesche GmbH Verfahren zur zerkleinerung von mahlgut und wälzmühle
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

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Publication number Publication date
JP2020523192A (ja) 2020-08-06
EP3618964A1 (de) 2020-03-11
AR112136A1 (es) 2019-09-25
WO2018228675A1 (de) 2018-12-20
JP6894986B2 (ja) 2021-06-30
CN110799269A (zh) 2020-02-14
DK3618964T3 (da) 2020-11-02

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