EP3849714A1 - Roue de tamisage à éléments de voile plats - Google Patents

Roue de tamisage à éléments de voile plats

Info

Publication number
EP3849714A1
EP3849714A1 EP20804601.1A EP20804601A EP3849714A1 EP 3849714 A1 EP3849714 A1 EP 3849714A1 EP 20804601 A EP20804601 A EP 20804601A EP 3849714 A1 EP3849714 A1 EP 3849714A1
Authority
EP
European Patent Office
Prior art keywords
wheel
classifying
surface elements
classifier
sail surface
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
EP20804601.1A
Other languages
German (de)
English (en)
Other versions
EP3849714C0 (fr
EP3849714B1 (fr
Inventor
Michael Betz
Florian GEHRKE
Burkhard Kraft
Werner Hollstein
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.)
Gebr Pfeiffer Se
Original Assignee
Gebr Pfeiffer Se
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 Gebr Pfeiffer Se filed Critical Gebr Pfeiffer Se
Publication of EP3849714A1 publication Critical patent/EP3849714A1/fr
Application granted granted Critical
Publication of EP3849714C0 publication Critical patent/EP3849714C0/fr
Publication of EP3849714B1 publication Critical patent/EP3849714B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • 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
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the present invention relates to a classifying wheel for a classifying device for classifying ground comminution products, in particular particulate bulk material, the classifying wheel comprising classifying wheel lamellae which are arranged in the radially outer region of the classifying wheel.
  • WO 2017/067913 A1 discloses a viewing device with a rotor cage which can be rotated about an essentially vertically oriented axis of rotation and whose outer surface is formed by rotor blades.
  • a plurality of Lei tensen adjoin the rotor blades, which extend in the radial direction, in particular with a tangential component, downwards in the direction of the rotor axis into the rotor cage.
  • the guide elements extend as far as the axis of rotation of the rotor cage, but not into the radially inner area near the opening of the fines discharge.
  • EP 0 645 196 A1 discloses a pneumatic vortex classifier with a rotor, vortex flow adjusting vanes and a flow straightening vane.
  • EP 0 983 802 A2 discloses a classifier wheel with a circular disk carrying a classifier wheel hub and an annular cover disk.
  • the present invention has the task of providing an advantageous arrangement of sail surface elements in a classifying wheel, in particular with regard to separation efficiency and energy efficiency.
  • the invention provides a classifying wheel for a classifying device for classifying ground comminution products, in particular particulate bulk material, which comprises classifying wheel lamellae, which are arranged in the radially outer region of the classifying wheel, as well as sail surface elements, which are radially spaced from the classifying wheel lamellae in the radially inner region of the classifier wheel are arranged.
  • a classifying wheel for a classifying device for classifying ground comminution products, in particular particulate bulk material, which comprises classifying wheel lamellae, which are arranged in the radially outer region of the classifying wheel, as well as sail surface elements, which are radially spaced from the classifying wheel lamellae in the radially inner region of the classifier wheel are arranged.
  • an air stream with ground comminution products of various grain sizes carried therein flows from radially outward to radially inward into the rotating classifier wheel and through the classifier wheel lamellae, in order to be withdrawn in the axial
  • the sail surface elements are designed to break up an otherwise generated potential vortex in the classifying wheel and thereby reduce the pressure loss in the classifying air flow. Since, in particular, a different number of sail surface elements and classifying wheel lamellas is provided, the arrangement of sail surface elements relative to the classifying wheel slats is not always uniform. This can lead to different flow resistances for the flow of the classifying air through the classifying wheel lamellae in the circumferential direction of the classifying wheel.By the radial spacing of the sail surface elements in the radial direction of the classifying wheel from the classifying wheel lamellae, an essentially rotationally symmetrical flow profile can be achieved in the classifying wheel lamellas.
  • the radial spacing of the sail surface elements from the classifying wheel lamellas can create a gap between the sail surface elements and the classifier wheel elements are present, which ensures that the influence of the sail surface elements on the flow profile is kept low by the classifier wheel lamellae.
  • an essentially rotationally symmetrical flow profile can be generated in the classifying space radially outside the classifying wheel lamellae, despite the sail surface elements inside the classifying wheel, whereby good separation and, in particular, very high sharpnesses are achieved.
  • a high degree of separation ensures that ground comminution products above a certain grain size are essentially separated in the separating chamber and can thus be fed to a new grinding process.
  • the particulate bulk material is ground rock material, for example limestone, gypsum, coal or mudstone, mineral bulk material, for example cement or cement material, or recycled bulk material, for example recycled gypsum concrete slab material, blast furnace slag, flue gas desulfurization gypsum or fly ash.
  • ground rock material for example limestone, gypsum, coal or mudstone
  • mineral bulk material for example cement or cement material
  • recycled bulk material for example recycled gypsum concrete slab material, blast furnace slag, flue gas desulfurization gypsum or fly ash.
  • the classifier wheel can be used for a bulk material mill, in particular for a rock mill, advantageously in a vertical roller mill.
  • the grinding is effected in particular by rotating a grinding table relative to grinding rollers around a central axis of the grinding table, so that the grinding rollers roll around a roller axis of rotation on a grinding track of the grinding table in order to grind the particulate bulk material and reduce its grain size.
  • other bulk material mills can also be used in combination with the classifier wheel, in particular bulk material mills which initially generate grain size distributions that do not yet correspond to the desired grain size distribution of the end product.
  • a classifying device with the classifying wheel according to the invention is then used in order to separate particles with excessively large grain sizes in the comminution product and to feed them back to the grinding process.
  • the angle of inclination of the sail surface elements with respect to the axial direction of the classifier wheel in the surface spanned by the axial direction and circumferential direction of the classifier wheel is constant along the entire axial extent of the sail surface elements. In this way, a radial eddy flow generated by turning the classifier wheel can be broken up more efficiently.
  • the sail surface elements extend straight in the axial direction of the classifier wheel.
  • the sail surface elements extend in a surface spanned by the axial direction and radial direction of the classifying wheel.
  • the radial distance between the radially inner end of the classifying wheel lamellae and the radially outer end of the sail surface elements is constant along the entire axial extent of the classifying wheel.
  • the radial distance between the radially inner end of the classifying wheel lamellae and the radially outer end of the sail surface elements is at least 3% of the diameter of the classifier wheel, advantageously at least 5%.
  • the radial distance is at most 30%, advantageously at most 20% of the diameter of the classifier wheel.
  • the sail surface elements extend straight in the radial direction of the classifier wheel.
  • the sail surface elements are at least partially curved and / or inclined with respect to the radial direction of the classifier wheel.
  • the radially outer edge of the sail surface element is trailing with respect to the direction of rotation of the classifying wheel seen before, so in particular in the circumferential direction set back against the direction of rotation.
  • the curved and / or inclined design of the sail surface elements enables the flow behavior to be optimized to reduce the flow resistance in the direction of the discharge opening of the classifier wheel. In particular, potential vortices can be further reduced as a result.
  • the classifier wheel lamellas are at least partially curved and / or inclined relative to the ra-media direction of the classifier wheel, the inclination of the gel surface elements in relation to the radial direction at least at their radially outer edge being greater than the inclination of the classifier wheel lamellae compared to the radial direction at least their radially inner edge.
  • the radially outer edge of the sail surface elements is at least partially curved and / or inclined with respect to the axial direction of the classifying wheel. In this way, the flow in the direction of the discharge opening can be promoted or reduced in the axial direction in order to provide the desired flow state in the classifying space and within the classifying wheel.
  • the surface elements of the sail are in particular formed from a rigid, flat material, for example sheet steel.
  • the sail surface elements can, however, also have varying thickness along their extension, for example in order to optimize the flow conditions thereon.
  • the sail surface elements can be arranged at least partially at their radially inne Ren end on a central shaft in the classifier wheel.
  • the classifier wheel can be mounted on the central shaft.
  • the central shaft can be a solid or hollow shaft. The provision of the central shaft and the direct connection of the sail surface elements to it has the particular effect that no vortex can arise in the center of the classifier wheel.
  • the sail surface elements can be guided up to the radial center of the classifier wheel. This allows the size of the sail surface elements to be maximized.
  • a distance can be provided between a centrally arranged shaft and the Segelflä chenetti. This enables a flow between the areas separated by the sail area elements in the radially inner area of the classifier wheel.
  • the sail surface elements are evenly distributed in the circumferential direction in the sight wheel.
  • uniform flow conditions can be achieved in the classifier wheel, which in turn promotes uniform flow conditions in the classifier space.
  • At least four sail surface elements are provided. In some embodiments, more than 6, 8, 10, 12, 14 or 16 sail surface elements can be provided. In particular, the larger the diameter of the classifying wheel, the more sail surface elements are useful.
  • the sail surface elements extend at least partially over the entire height of the interior of the classifier wheel. In this way, the formation of eddies can be prevented, particularly in the area of the axial discharge opening.
  • the distance between the radially inner end of the classifying wheel lamellae and the radially outer end of the sail surface elements is advantageously adjustable. This can be light made possible in particular by a radial displaceability of the classifying wheel lamellae and / or sail surface elements.
  • the classifier wheel lamellae and / or sail surface elements can be provided ver slidable in slots in carrier plates at the axial ends of the classifier wheel. In particular, it can be fastened by screwing. In some perpetratsfor men it is also possible to adjust the classifying wheel slats and / or sail surface elements in the circumferential direction.
  • the surface elements of the sail can only extend as far as an area of the classifying wheel adjoining a discharge opening.
  • the invention further provides a sifting device for sifting ground comminution products, in particular for sifting particulate bulk material, which has the sifting wheel according to the invention and a guide vane ring, within which the sifting wheel is rotatably arranged, with a sifting space formed between the guide vane ring and the sifting wheel becomes.
  • the separation of coarse material from the sifting air primarily takes place in the sifting room by falling out of the sifting air stream under the influence of gravity.
  • the invention further provides a system for grinding feed material in the form of particulate bulk material, comprising a bulk material mill, in particular a bowl mill, and a classifying device, as defined above.
  • the sighting device is arranged in particular above the bulk material mill, with particulate bulk material being transported from the bulk material mill to the classifying device by means of the classifying air.
  • a discharge line is advantageously arranged centrally above the classifier wheel.
  • the classifier wheel has a discharge opening in its radially inner area, so that the interior of the classifier wheel is connected to the discharge line and the classifying air can convey fine material accordingly from the classifier wheel into the discharge line.
  • the discharge line can also be arranged under the classifier wheel.
  • the invention provides a method for classifying ground comminution products, in particular of particulate bulk material, wherein the ground comminution product is fed into a classifying space surrounding a rotating classifying wheel, and an air flow is provided which flows radially inward into the rotating classifying wheel and then axially Direction is discharged through a discharge opening in the classifying wheel, the air flow in the area of the classifying wheel adjacent to the discharge opening entrains part of the comminuted product in the axial direction along sail surface elements.
  • sail wheel surfaces are provided in the area of the classifier wheel adjoining the discharge opening, so that no vortex can arise within the classifier wheel that would impair the removal of the fines in the classifier air from the classifier wheel.
  • the radial distance between the radially outer end of the sail surface elements and the radially inner end of the classifier wheel lamellae of the classifier wheel can optionally be set as a function of the speed and / or the diameter of the classifier wheel. This can be done by an automatic adjustment of the sail surface elements and / or the classifying wheel lamellae in the radial and / or circumferential direction by actuators controlled by a controller. This can take place in particular during operation and as a function of the operating conditions, in particular the speed and / or the delivery rate. Alternatively, the setting can also be made manually during breaks in operation.
  • the air flow between the classifier wheel slats is rotationally symmetrical.
  • the invention further provides a method for classifying ground comminution products, in particular particulate bulk material, wherein ground comminution product is fed into a classifying space surrounding a rotating classifying wheel, and a Air flow is provided, which flows radially inward through radially outer classifying wheel lamellae in the rotating classifying wheel and then flows in the axial direction along radially inner sail surfaces elements, with an identical flow condition in all spaces between the equally spaced classifying wheel lamellae. This is achieved in particular by a radial spacing of the sail surface elements from the classifying wheel lamellae. In particular, all of the classifying wheel lamellae can be arranged at the same distance from one another.
  • the invention provides a use of sail surface elements in the sifting of ground comminution products, in particular of particulate bulk material, the sail surface elements being arranged in the radially inner region of a classifying wheel so that they are exposed to the air flow in the circumferential direction of the air flow guided through the classifying wheel, and thus can be used to recover energy from the air flow for the rotation of the classifier wheel. That is, the sail surface elements and in particular the classifier wheel lamellas are arranged or inclined in such a way that the pressure on the back of the sail surface elements in the direction of rotation of the classifier wheel is higher than the pressure on the front side of the sail surface elements in the direction of rotation.
  • Fig. 1 is a side sectional view of a viewing device according to an embodiment of the present invention
  • FIG. 2 shows a horizontal sectional view through the classifier wheel according to FIG. 1;
  • Fig. 3 is a sectional view through a classifier wheel according to an embodiment of the inven tion
  • FIG. 4 shows a sectional view through a classifier wheel according to a further embodiment of the invention.
  • FIG. 5 shows a sectional view through a classifier wheel according to a further embodiment of the invention.
  • Fig. 6 is a side sectional view through a viewing device according to a further embodiment of the invention.
  • a viewing device 1 is Darge provides.
  • the classifying device 1 enables coarse material to be separated from fine material in a stream of classifying air, the coarse material to be fed back to a grinding process and the fine material to be transported away for further processing.
  • a classifying wheel 2 is provided, which can be rotated by means of a motor 3 about a vertical axis ver.
  • the classifying wheel 2 is located within a guide vane ring 4. arranges.
  • an outer ring of classifier wheel lamellae 5 of the classifier wheel is spaced radially from the guide vane ring 4, so that a classifying space 6 is formed between the classifying wheel lamellae 5 and the guide vane ring 4.
  • a ground comminution product in particular particulate bulk material, is carried along by a stream of air from the radial outside through a guide vane ring 4 and then enters the classifying chamber 6.
  • the rotation of the classifying wheel lamellae 5 together with the classifying wheel 2 creates flow conditions in the classifying space that cause that coarse portions of the ground comminution products precipitate downwards and only comminution products which have at least a certain degree of fineness are transported radially inward into the classifying wheel 2.
  • the classifying air flows through the classifying wheel lamellae 5 into the interior of the classifying wheel and then through a discharge opening 7 in a downstream processing device.
  • the downstream processing device can only consist of the fine material being poured up, transported further and / or packaged.
  • a radial spacing 100 is provided between the sail surface elements 8 and the classifying wheel lamellae 5.
  • the effect of the sail surface elements 8 on the flow of the classifying air through the classifying wheel lamellae 5 can be reduced, so that there is a more uniform flow profile in the classifying space 6.
  • the sail surface elements prevent undesirable potential vortices from developing inside the classifier wheel 2, and can advantageously contribute to energy recovery with regard to the flow of the classifier air by reducing the required drive power of the motor 3.
  • the sail surface elements 8 are attached to the shaft 9 of the classifier wheel or at least connected to it.
  • a fines discharge line 10 is provided above the discharge opening 7, with which fines with the desired grain sizes are removed in an air stream.
  • the discharge line 10 is arranged in particular above the classifier wheel.
  • a funnel 11 can be arranged under the classifying wheel 2, which collects coarse material falling from the classifying space 6 and feeds it to a grinding process.
  • a grinding table can be arranged centrally below the funnel 11 so that the grinding stock is fed centrally to the rotating grinding table and is then comminuted again by grinding rollers before it is again gripped by a stream of classifying air and fed to the classifying device 1.
  • the ground material or the comminution products are guided through the classifier 1 until the desired shredding stage is reached, so that the corresponding fine material can pass through the classifying space 6 into the interior of the classifying wheel and then be discharged via the discharge line 10.
  • the sail surface elements 8 extend directly to the discharge opening 7 of the classifying wheel 2.
  • the classifying air flow in the classifying wheel 2 is guided through the sail surface elements 8 up to its discharge opening 7. This prevents the creation of undesired air vortices in the classifier wheel 2 and improves the energy recovery from the Air flow.
  • the sail surface elements 8 extend over the entire height of the classifier wheel 2.
  • FIG. 2 shows the horizontal sectional view A-A drawn in FIG. 1 through the embodiment of the classifying wheel 2 according to the invention.
  • the classifying wheel 2 has a central shaft 9 with sail surface elements 8 extending therefrom in the radial direction.
  • the classifying wheel lamellae 5 are arranged at a radial distance 100 from the radially outer ends 8 of the sail surface elements 8.
  • the classifying wheel lamellae 5 are here slightly inclined in pairs in opposite directions with respect to the radial direction. Furthermore, a higher number of classifier wheel elements 5 than of sail surface elements 8 is provided.
  • FIG 3 a further embodiment of a classifier wheel 2 is shown in a horizontal sectional view.
  • the sail surface elements 8 are designed with a corrugated profile.
  • the sail surface elements 8 are curved counter to the intended direction of rotation. That is, the sail surface elements each have different angles to the radial direction over their extension.
  • the classifying wheel lamellae 5 are inclined with respect to the radial direction.
  • the angle 200 of the radially outer end of the sail surface element 8 with respect to the radial direction is greater than the angle 300 of the classifying wheel lamellas 5. This enables an advantageous flow profile in the classifying space 6, i.e. radially outside of the classifying wheel lamellas 5.
  • FIG. 4 shows by way of example how the sail surface elements can be guided up to the radial center of the classifier wheel. This is particularly possible if no shaft 9 is provided in this area, but rather the shaft is flanged, for example, only axially outside on the classifying wheel 2.
  • a classifier wheel 2 is shown, in which a radial distance between the centrally arranged shaft 9 and the sail surface elements 8 is provided.
  • the wing surface elements arranged in the radially central area nevertheless enable an effective reduction of vortices, but it can be advantageous if the wing surface elements 8 are guided at least in the area of the area adjacent to the discharge opening 7 up to the central shaft 9.
  • the sail surface elements 8 in FIGS. 2 to 5 each extend straight in the axial direction of the classifier wheel 2.
  • FIG. 6 shows an embodiment in which the radially outer edge of the sail surface elements is inclined with respect to the axial direction.
  • the area of the sail surface elements 8 increases towards the discharge opening, so that in these areas where a there is an increased air flow, an effective suppression of air eddies is possible.
  • the sail surface elements 8 can not only be used to suppress eddy currents, but can also be driven by the air flow, and thus at least reduce the power input via the motor 3 for driving the classifier wheel Sail surface elements 8 from the classifying wheel lamellae 5 a reaction of the sail surface elements on the classifying space 6 can be reduced. In particular, it can be prevented that there is an uneven air flow in the circumferential direction depending on the sail surface elements 8 in the viewing space 6.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Abstract

L'invention concerne une roue de criblage (2) pour un dispositif de tamisage (1) pour tamiser des produits de meunerie moulus, en particulier un matériau en vrac particulaire, comprenant des lamelles de roue de tamisage (5), qui sont disposées dans la zone radialement extérieure de la roue de tamisage (2), et des éléments de tissu de toile (8), qui sont disposés dans la zone radialement intérieure de la roue de tamisage (2) à une distance radiale des lamelles de roue de tamisage (5). L'invention concerne en outre un procédé de tamisage de produits de meunerie moulus et l'utilisation d'éléments de tissu de toile (8) lors du tamisage de produits de meunerie moulus.
EP20804601.1A 2019-11-22 2020-11-18 Roue de triage à éléments de voile plats et procédé de tamisage avec une telle roue Active EP3849714B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19210946 2019-11-22
PCT/EP2020/082550 WO2021099396A1 (fr) 2019-11-22 2020-11-18 Roue de tamisage à éléments de voile plats

Publications (3)

Publication Number Publication Date
EP3849714A1 true EP3849714A1 (fr) 2021-07-21
EP3849714C0 EP3849714C0 (fr) 2023-08-23
EP3849714B1 EP3849714B1 (fr) 2023-08-23

Family

ID=68654388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20804601.1A Active EP3849714B1 (fr) 2019-11-22 2020-11-18 Roue de triage à éléments de voile plats et procédé de tamisage avec une telle roue

Country Status (4)

Country Link
US (1) US11826786B2 (fr)
EP (1) EP3849714B1 (fr)
CN (1) CN114728312B (fr)
WO (1) WO2021099396A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1229371B (de) 1966-02-04 1966-11-24 Polysius Gmbh Windsichter
WO1994022599A1 (fr) * 1993-03-31 1994-10-13 Onoda Cement Co., Ltd. Separateur a air a tourbillon
AT401741B (de) * 1993-08-19 1996-11-25 Thaler Horst Dipl Ing Windsichter
DE19606672A1 (de) * 1996-02-22 1997-08-28 Krupp Polysius Ag Sichter
DE19840344C2 (de) 1998-09-04 2002-04-04 Hosokawa Alpine Ag & Co Sichtrad für einen Zentrifugalkraft-Windsichter
US6902126B2 (en) * 2002-11-04 2005-06-07 Alstom Technology Ltd Hybrid turbine classifier
NO321643B1 (no) * 2004-05-18 2006-06-19 Comex As Partikkelseparator
DE102006044833B4 (de) * 2006-09-20 2010-01-21 Babcock Borsig Service Gmbh Zentrifugalsichter und Verfahren zum Sichten
FR2941389B1 (fr) * 2009-01-29 2011-10-14 Fives Fcb Dispositif de separation granulometrique selective de matieres pulverulentes solides, a action centrifuge, et procede d'utilisation d'un tel dispositif
JP2010227924A (ja) * 2009-03-03 2010-10-14 Ricoh Co Ltd 分級装置及び分級方法
DE102015220269A1 (de) * 2015-10-19 2017-04-20 Thyssenkrupp Ag Sichteinrichtung zum Sichten eines Materialstroms
DE102016106588B4 (de) * 2016-04-11 2023-12-14 Neuman & Esser Process Technology Gmbh Sichter

Also Published As

Publication number Publication date
EP3849714C0 (fr) 2023-08-23
WO2021099396A1 (fr) 2021-05-27
CN114728312A (zh) 2022-07-08
US11826786B2 (en) 2023-11-28
EP3849714B1 (fr) 2023-08-23
US20220410212A1 (en) 2022-12-29
CN114728312B (zh) 2024-07-09

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