EP4059624A1 - Dispositif et procédé de criblage de marchandises pulvérulentes - Google Patents

Dispositif et procédé de criblage de marchandises pulvérulentes Download PDF

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Publication number
EP4059624A1
EP4059624A1 EP22000047.5A EP22000047A EP4059624A1 EP 4059624 A1 EP4059624 A1 EP 4059624A1 EP 22000047 A EP22000047 A EP 22000047A EP 4059624 A1 EP4059624 A1 EP 4059624A1
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EP
European Patent Office
Prior art keywords
wheel
classifying
classifying wheel
internals
flow
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
EP22000047.5A
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German (de)
English (en)
Other versions
EP4059624B1 (fr
Inventor
Stefano L. Zampini
Benjamin BIBER
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.)
Hosokawa Alpine AG
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Hosokawa Alpine AG
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Publication of EP4059624A1 publication Critical patent/EP4059624A1/fr
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    • 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

Definitions

  • the invention relates to a classifying wheel for a centrifugal air classifier according to the preamble of claim 1 and a method for separating classified material dispersed in a classifying fluid into a fine and a coarse fraction according to the preamble of claim 10.
  • Air classifiers are used to separate a material dispersed in a fluid into a fine and a coarse fraction.
  • the separating effect of a classifying wheel is based on the fact that the drag force of the fluid and the centrifugal force in the flow channels between the classifying wheel blades of a classifying wheel, the so-called deflector wheel, act in opposite directions on the individual particles of the solid.
  • the drag force predominates, so that they are carried along by the fluid and discharged as fines.
  • the centrifugal force predominates, so that they are thrown out of the deflector wheel against the fluid flow.
  • the particle size for which centrifugal force and drag force are in equilibrium i.e. which is equally likely to end up in the fine or coarse material, is referred to as the cut-off size or cut-off point.
  • Centrifugal air classifiers with a deflector wheel are one of the preferred classifiers for producing very fine classifying materials with relatively little energy consumption. For a clear separation of the sifted material into fine material and coarse material, it is necessary for the fluid to flow through all flow channels of the deflector wheel with the same mean radial velocity.
  • DE 198 40 344 A2 discloses providing internals in the radially outer region of the classifier wheel channels in order to prevent unwanted and uncontrolled formation of vortices in the flow channels between the classifier wheel blades.
  • the internals in the radially outer area of the classifier wheel channels are intended to create a controlled formation of vortices to generate a classifying zone in the outer area between the classifier wheel blades.
  • This sucking out of the fines from inside the classifying wheel results in unstable flow conditions during classifying, which prevent higher fineness from being achieved.
  • this outflow occurs during the sifting and takes place at least in a flow channel between two sifting wheel blades.
  • the object of the invention is therefore to provide a classifying wheel and a classifying method which prevents unstable flow conditions due to the formation of vortices in the flow channels of classifying wheels.
  • the classifying wheel according to the invention for a centrifugal force wind classifier is rotationally driven in this and is flowed through from the outside to the inside against its centrifugal direction. It has classifying wheel vanes arranged in a ring between two retaining disks. The classifier wheel vanes and the retaining disks delimit the flow channels. Built-in components influencing the course of flow are arranged in these flow channels.
  • the classifying wheel according to the invention In its flow channels, which are delimited by the classifying wheel blades, the classifying wheel according to the invention also has internals near the outlet side of the flow channels, i.e. towards the axis of rotation of the classifying wheel. These internals mean that the individual flow channels are flowed through with the same or at least a similar quantity of fluid.
  • baffles are located within the inner two-thirds (2/3) of the classifier wheel radius in the flow channels.
  • the built-in components are preferably located on a common radial circular path, which is approximately in an area that lies within the inner two-thirds of the classifier wheel radius.
  • the flow breakers in the radially inner area of the classifier wheel blades are internals whose cross sections preferably have a polygonal (e.g. square, rectangular, quadrangular, triangular) or round shape or a combination thereof and preferably extend axially over the entire axial height of the classifier wheel blades or the flow channels .
  • a polygonal e.g. square, rectangular, quadrangular, triangular
  • round shape a combination thereof
  • any other cross-sectional shape can also be used.
  • these internals do not extend over the entire axial height of the classifier wheel blades. In a further embodiment, the internals are not on a common circular path around the axis of rotation of the classifier wheel.
  • the radial distance between these built-in components and the axis of the classifying wheel is not constant along the height of the axis of the classifying wheel.
  • the internals are designed in such a way that they continuously narrow the flow channel from a radially further outward position to a radially further inward position. This is intended to mean that the narrowing occurs without one or more angular gradations.
  • These internals can be located either on both sides of the classifier wheel blades or only on the front or rear side of the classifier wheel blades, viewed in the direction of rotation of the classifier wheel.
  • a preferred variant of the internals terminates on the inside of the classifying wheel blades approximately flush or flush with the latter.
  • the size and shape of the internals can vary depending on the application. A combination of two or more differently shaped internals is also possible.
  • the classifier wheel blades and the internals can be made from one part or from several parts.
  • the classifying wheel in the flow channels also has built-in components within the radially outer third, based on the classifying wheel radius.
  • both the radially outer sifting vortex can be advantageously influenced for fine sifting and the flow in the flow channels can be stabilized. So both vortices are bounded on both sides by internals.
  • the internals are designed as metal sheets with bores or openings and protrude over the entire height and width of the flow channels. They are arranged in the flow channels.
  • the contours of the metal sheets preferably follow the circular path around the axis of rotation of the classifying wheel on which they are arranged.
  • the sheets have a constant distance to the classifying wheel axis. The distance is less than two thirds of the radius of the separator wheel. This type of internals also limits the vortex inwards.
  • the retaining disks, between which the classifying wheel blades are arranged, can be designed as hub disks or cover disks.
  • the cover disk is provided with a fines outlet. It is preferably designed in the form of a ring.
  • the classifying wheel according to the invention can be designed either as a single-flow or as a double-flow.
  • a double-flow classifying wheel can be composed of two single-flow classifying wheels.
  • the classifying wheels are assembled on their cover disks so that they have a common axis of rotation.
  • the double-flow sifter wheel now has two hub disks and is mounted on both sides in the housing of the centrifugal air sifter.
  • the two hub disks have openings that represent the outlets for the fines.
  • the cover disks in the middle of the classifying wheel are omitted, so that it has a continuous interior area.
  • the internals a in the radially outermost area of the classifier wheel blades result in the momentum of the inflowing fluid being converted more efficiently into an increase in velocity in the classifying vortex than in the case of the patent specification EP 0 983 802 A2 revealed sight wheel.
  • the variants which have discontinuous profiles of the specially shaped classifying wheel blades due to kinks and edges, are not as efficient as variants with continuous contours due to losses in momentum exchange. Since the variants with kinked ends of the separator vane do not convert the momentum of the inflowing fluid as efficiently, the speed increases are lower there in comparison to continuous contours.
  • the flow in the classifying wheel could be stabilized and the fineness range of classifiers could be improved towards smaller finenesses by means of a classifying wheel with the installations according to the invention in the flow channels towards the outlet side.
  • the figure 1 shows a classifying wheel (10) for a centrifugal air classifier. It comprises a hub disc (2) carrying the classifying wheel hub (1) and an annular cover disc (4).
  • the classifying wheel blades (3) arranged in a ring are arranged between these discs. They are distributed evenly over the circumference of the classifying wheel (10).
  • the classifying wheel vanes (3) are aligned essentially radially and delimit the flow channels.
  • the classifying wheel (10) is flowed through from the outside inward by the particle-laden classifying fluid, for example classifying air.
  • the classifying wheel (10) according to the invention has flow channels which have internals (5) in the outer third, based on the classifying wheel radius, and in addition to these internals, further internals (7) in the inner two thirds of the flow channels, based on the classifying wheel radius. These narrow the flow channel (6) on the outlet side and thereby stabilize the flow in the separator wheel (10).
  • Sections of cross-sections of classifier wheels (10) are shown which, in addition to the known external internals (5) in the outer area of the flow channels (6), also have internals (7) in the inner two-thirds of the flow channels (6), based on the classifier wheel radius .
  • the classifying wheel blades (3) do not run exactly in the radial direction in the radially outer third, the classifying wheel radius, but are arranged inclined at an angle to the radial direction counter to the direction of rotation. In the inner two-thirds they are aligned radially.
  • the inner vortex is bounded on both sides by the internals (5, 7). There is no longer any outflow of the fluid with particles from the middle of the classifying wheel to the outside into the classifying space around the classifying wheel, as a result of which the flow through the classifying wheel is stabilized.
  • the course of the undisturbed flow of fines from the outside inwards is indicated by the thick arrow in the figures 2 and 3 shown.
  • the built-in components (7) are preferably located on a common radial circular path, which is in an area that lies within the inner two-thirds of the classifying wheel radius.
  • the internals (7) are rectangular. They are fitted inside the flow channels (6) on the two classifying wheel vanes (3) delimiting the channel.
  • FIG 3 shows a further embodiment of the internals (7). They are designed in such a way that they continuously narrow the flow channel (6) from a radially outer position to a radially inner position. This is intended to mean that the narrowing occurs without one or more angular gradations.
  • These internals (7) are only on one side of the flow channel (6). The internals (7) are almost flush with the classifier wheel blades (3) on the inside. You can also finish flush.
  • the inner installations (7) are designed in such a way that the installations (7) together with the separator wheel blades (3) converge radially inwards in a point, this prevents material deposits on the inner separator wheel blade edges.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP22000047.5A 2021-03-09 2022-03-03 Dispositif et procédé de criblage de marchandises pulvérulentes Active EP4059624B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021001239.9A DE102021001239B4 (de) 2021-03-09 2021-03-09 Vorrichtung und Verfahren zur Sichtung von staubförmigen Gütern

Publications (2)

Publication Number Publication Date
EP4059624A1 true EP4059624A1 (fr) 2022-09-21
EP4059624B1 EP4059624B1 (fr) 2023-10-04

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Application Number Title Priority Date Filing Date
EP22000047.5A Active EP4059624B1 (fr) 2021-03-09 2022-03-03 Dispositif et procédé de criblage de marchandises pulvérulentes

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EP (1) EP4059624B1 (fr)
DE (1) DE102021001239B4 (fr)
ES (1) ES2966594T3 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226682A (ja) * 1988-07-18 1990-01-29 Babcock Hitachi Kk 粉砕分級装置
US5055182A (en) * 1989-01-12 1991-10-08 Krupp Polysius Ag Separator
EP0983802A2 (fr) 1998-09-04 2000-03-08 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Roue de triage pour séparateur pneumatique centrifuge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0226682A (ja) * 1988-07-18 1990-01-29 Babcock Hitachi Kk 粉砕分級装置
US5055182A (en) * 1989-01-12 1991-10-08 Krupp Polysius Ag Separator
EP0983802A2 (fr) 1998-09-04 2000-03-08 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Roue de triage pour séparateur pneumatique centrifuge
DE19840344A1 (de) 1998-09-04 2000-05-04 Hosokawa Alpine Ag & Co Sichtrad für einen Zentrifugalkraft-Windsichter

Also Published As

Publication number Publication date
DE102021001239B4 (de) 2024-03-21
ES2966594T3 (es) 2024-04-23
DE102021001239A1 (de) 2022-09-15
EP4059624B1 (fr) 2023-10-04

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