EP2254708B1 - Process for sifting a mixture of a milled material and a fluid, and mill sifter - Google Patents
Process for sifting a mixture of a milled material and a fluid, and mill sifter Download PDFInfo
- Publication number
- EP2254708B1 EP2254708B1 EP09777119A EP09777119A EP2254708B1 EP 2254708 B1 EP2254708 B1 EP 2254708B1 EP 09777119 A EP09777119 A EP 09777119A EP 09777119 A EP09777119 A EP 09777119A EP 2254708 B1 EP2254708 B1 EP 2254708B1
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- European Patent Office
- Prior art keywords
- classifier
- mill
- displacement body
- dynamic
- fluid flow
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- 239000012530 fluid Substances 0.000 title claims abstract description 59
- 239000000463 material Substances 0.000 title claims abstract description 24
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- 230000008569 process Effects 0.000 title abstract description 9
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 46
- 239000002245 particle Substances 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 9
- 238000000265 homogenisation Methods 0.000 claims description 6
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- 238000009434 installation Methods 0.000 abstract description 2
- 238000003801 milling Methods 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 description 11
- 238000000227 grinding Methods 0.000 description 10
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- 230000005514 two-phase flow Effects 0.000 description 2
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- 230000008021 deposition Effects 0.000 description 1
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Images
Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
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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
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/10—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects
- B07B13/11—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects involving travel of particles over surfaces which separate by centrifugal force or by relative friction between particles and such surfaces, e.g. helical sorters
Definitions
- the invention relates to a method for the screening of a millbase-fluid mixture according to the preamble of claim 1 and a mill classifier for carrying out the method according to the preamble of claim 6.
- the invention is particularly suitable for roller mill classifiers, which may be integrated in a roller mill or in a roller mill, for example, in an air flow mill or placed on this.
- the classifiers typically include a dynamic classifier such as a ridge rotor, and stationary vanes which are annularly disposed about the dynamic indexer to form a viewing space.
- the millbase-fluid mixture passes in an upwardly directed, spiral flow close to the housing into the viewing area, where the coarse material particles are separated off and fall back into the grinding chamber via a semolina cone for renewed comminution.
- the fine material entering the inguinal rotor is fed to the sifter upper part in a fine-material fluid flow and to a fine-material separation via a fine-material discharge and a pipeline ( EP 1 239 966 B1 . DE 44 23 815 C2 . EP 1 153 661 B1 . DE 36 17 746 A1 . DE 34 03 940 C2 ).
- Air separators are described with a device for influencing the flow path, which is arranged in a Heilabströmraum. Of the Heilabströmraum is enclosed by a crusherrad and its blades, and around the reformerrad a reformraum is formed, to which the reformgut is supplied together with or separated from the reformluft.
- the device for influencing the flow path in the separator consists of guide vanes, which are curved in the radial direction and are arranged along the radial outer boundary of the air outlet space.
- the Beerabströmraum merges into a coaxially formed fines-air outlet, and the edges arranged in the Lucasabströmraum, arcuate vanes are attached to the inside of the air outlet.
- the arrangement of the device for influencing the flow within the classifier rotor and close to the blades of the classifier rotor can adversely affect the sighting in the viewing area and lead to a reduced quality of the sighting.
- a subsequent installation of the device or a replacement is relatively expensive.
- the fine material aerosol is sucked in the flow direction immediately behind the rotor blades in an annular suction or in a suction tube below the rotor.
- a Leitschaufelapparat or a diffuser which is arranged in the annular suction channel or in the suction tube, should be taken out of the flow after the suction at least a portion of the still in the extracted fine material aerosol dispersion swirl.
- the interactions between the suction channel or suction tube and the arrangement and / or dimensioning of the rotor blades can affect the throughput, selectivity and separation limits.
- an air classifier with a rotating in a viewing chamber classifying wheel.
- the classifying wheel is provided with a cover disk, and the fine-fine-air flow passes through an axial discharge opening in the cover plate of the classifying wheel in an expansion housing, which is designed as a spiral housing and provided with a lateral outlet channel.
- an expansion housing which is designed as a spiral housing and provided with a lateral outlet channel.
- fan blades reaching into the expansion vessel are arranged, which are to supply additional kinetic energy in the expansion vessel to the fine-material air flow.
- Out EP 0 645 196 A is a Spiralstromsichter with a strip rotor and a viewing space between the strip rotor and a vane ring known in which by a defined dimensioning of Rotorauslassö réelle, the distance between the rotor bars and the width of the rotor bars and the viewing space depending on the visual outcome or the grain size of the fine material also a Reduction of the pressure loss should be achieved.
- a lesser pressure drop should also be achieved by two- or three-row arranged rotor strips, a frusto-conical design of the inner rotor bottom with a defined inclination angle and a flow straightening means, which is fixed to the rotor shaft and planar radially oriented plates having a helical foot near the rotor base.
- a Zentrifugalwindsichter which is equipped with a stationary suction pipe.
- the suction tube covers the viewing space in the axial direction and is connected via openings with the viewing space.
- the suction pipe is provided with fluidic means.
- a central displacement body with a lower, cone-shaped projection which is arranged at the outlet of the suction tube, reduce its free cross-section or act as a diffuser.
- an outlet spiral is arranged, which is to convert the air rotating in the intake manifold in a rectilinear motion.
- the visual process has a great influence on the efficiency of a grinding plant.
- the visual process influences the smoothness of the mill, the throughput of finished goods and the pressure loss of the entire system.
- the differential pressure to overcome the flow resistances in the classifier and the power consumption at the rotor have a considerable share in the energy balance of the entire grinding plant.
- the invention has for its object to provide a visual method and a mill classifier, which increase the quality of the visual process and at the same time contribute to an improvement of the energy balance and a lower investment technical effort of the entire grinding plant.
- a basic idea of the invention can be seen in the fact that the fine material-fluid stream which emerges from the dynamic separator part due to the rotation of the rotor in a rotational movement or under a twist, to uniform and achieve a twist resolution or at least a significant reduction of the twist.
- twist is dependent on the peripheral speed of the rotor, which in turn depends on the particle size to be observed. Finer views require a higher peripheral speed than rougher views.
- the fine-material-fluid flow emerging with an angular momentum from the dynamic separator part is disadvantageous in various aspects.
- the fine material or the dust of the two-phase flow is pressed due to the centrifugal force generated by the swirl on the wall of the reformeroberteils, where due to the friction flow losses and wear.
- dust strands form, which leads with respect to the fine material-fluid flow to an uneven distribution of the fines particles in the classifier and also in the downstream dust collector.
- Cyclones and / or filters for example a bag filter, may be provided as dust separators. In visual processes and classifiers with no or only insufficient spin dissolution, overdimensioning of the dust collectors was carried out in many cases.
- the swirl of the two-phase flow emerging from the dynamic separator part is dissolved or at least considerably reduced and conveyed in the form of an approximately linear flow from the separator into the downstream separation unit.
- the dissolution of the twist avoids disadvantageous storage of flow energy and achieves a considerable saving in differential pressure or energy consumption.
- the equalization according to the invention of the fine material-fluid flow after exiting the dynamic separator part thus comprises a reduction or resolution of the angular momentum of the fine-fluid flow emerging from the rotor directly above the outlet cross-section of the dynamic separator part and the formation of a linear flow up to the outlet opening of the prepareers and down to the downstream units.
- the homogenization of the fine material-fluid flow comprises a deflection from a spiraling flow into a nearly vertical flow with the aid of a diffuser, which is arranged in a classifier outlet housing above the outlet cross-section of the dynamic classifier.
- the displacement body is expediently designed and arranged in such a way that the disadvantages of a pressure sink forming on account of the rotation of the dynamic separator part are largely avoided.
- the pressure sink or potential vortex sink stores the flow energy in the form of angular momentum.
- a part of the fine material-fluid flow is drawn into the rotor interior, whereby a backflow into the rotor center takes place and the regrind particles fall onto the rotor bottom.
- the displacement body is designed and arranged so that the pressure sink is covered and thus can not develop their effect, a further homogenization and an efficient fine-material fluid discharge is achieved without backflow into the dynamic safety part.
- An inventive mill classifier which is provided with a Leitklappenkranz and a dynamic separator portion to form a reformraums and with a Groggutab arrangement and at least one discharge opening for a fine material-fluid flow, has a device for equalization and spin dissolution downstream of the dynamic separator part in a reformeraustrittsgephaseuse ,
- the mill classifier according to the invention is a classifier integrated into or attached to an air flow roller mill with a strip rotor as the dynamic separator part and with a semolina cone for discharging the coarse material particles from the classifying chamber and returning them to the grinding chamber for further comminution.
- a nozzle with guide elements is provided, which influences the fine material-fluid flow aerodynamically.
- a displacement body in particular coaxial with the classifier or rotor axis, is also arranged.
- the device for equalization and spin dissolution of the fine material-fluid flow emerging from the dynamic separator part is designed to be stationary and, in addition, the distributor device forms a unit with the displacement body.
- the distributor is arranged according to the invention above an outlet cross-section of the dynamic separator in the reformerausbergsgephaseuse.
- the displacement body expediently extends beyond the distributor and may, for example, have a height which is two to five times the height of the distributor.
- the displacement body can expediently protrude with a lower, for example conical region in the dynamic separator part and prevent the formation of a pressure sink. If the dynamic sifter is a ridge rotor with an upwardly directed rotor cone, the lower conical portion of the pusher body can reach close to that rotor cone.
- the displacement body is formed as a double cone, in which the upper conical or frusto-conical region has a lower conicity than the lower conical or frusto-conical region.
- the displacement body can also be simplistic in axial section substantially cylindrical.
- a displacement body co-rotating with the rotor can also be provided.
- the diffuser can have the most diverse design in order to capture the fine material-fluid flow exiting with an angular momentum from the dynamic separator part and divert it into a substantially vertical linear flow.
- the distributor can have flat or plate-shaped guide elements, which are arranged in a radial manner.
- the guide elements may be formed as sheets and fastened to a guide tube, which is expediently arranged coaxially to the rotor axis.
- a guide tube which is expediently arranged coaxially to the rotor axis.
- the guide elements can also be arcuate and / or blade-shaped or spherical in order to capture the fine material-fluid flow in a streamlined manner and to redirect it in a sliding or gentle manner in a vertical flow direction.
- the guide elements can be attached with their rectifier surfaces on the outer circumference of the displacement body. Conveniently, this takes place in a lower region of the upper conical or frustoconical region of the displacement body, so that a larger area protrudes upward beyond the guide elements and contributes to the homogenization and linear flow of the fine material / fluid mixture.
- the apparatus it is expedient to provide a withdrawerauseriesgephaseuse which allows a further vertical upward flow of the uniform, linear fine material-fluid mixture between the displacement body and classifier housing.
- the reformerauseriesgephaseuse be designed for integrated arrangement of the nozzle and advantageously the displacement body and have an overall height H, which is twice to four times greater in relation to the height H L of the nozzle.
- the reformerauseriesgephaseuse is expediently cylindrical or conical and has in an upper and / or lateral area at least one outlet opening for the deflected, linear fine material-fluid flow.
- An outlet connection for the fine-material-fluid stream flowing out in the direction of the dust separator can, in particular, be arranged laterally obliquely or horizontally.
- the displacement body extends in a lateral arrangement of the outlet nozzle over the lower edge of the outlet nozzle.
- the advantages of the method according to the invention and the mill classifier according to the invention consist in a virtually swirl-free, well-mixed fine material-fluid mixture or dust-air flow with a uniform dust distribution at the classifier outlet and thus also at the inlet cross-section of the subsequent dust collector.
- the more even distribution of dust results in lower air consumption for the pneumatic transport of the dust or fine particles, with less wear on the walls of the classifier housing.
- the twist resolution according to the invention reduces the pressure loss in the classifier and thus also the power consumption of the classifier drive.
- the protestrungstrittsgephase may also have a simple construction. Essential are energy recovery or reduction and a much better efficiency in the downstream storage separation due to a more uniform distribution of the dust on individual filter chambers (modules) or a more even distribution on Abscheidezyklone. In addition to an improvement of the visual process and thus also the milling process thus a considerable increase in efficiency is achieved when operating a grinding plant.
- the method according to the invention is preferably suitable for air flow roller mills with a built-in classifier, but not limited to these.
- the device for spin dissolution or swirl reduction can basically be used in all classifiers with a dynamic rotating separator part. It is advantageous that the arrangement of the device according to the invention for swirl dissolution prefabricated with a diffuser and with a displacement body and also can be retrofitted in a classifier or placed on this.
- Fig. 1 shows a mill classifier 2, which is integrated into a roller mill. From the roller mill, only an upper region of the mill housing 21 with a lateral Mahlgutzu operation 23 is shown. At the Mahlgutgeophuse 21, the classifier housing 22 connects.
- the mill classifier 2 has a dynamic separator part 4, which in this exemplary embodiment is a strip rotor with rotor strips 5 arranged concentrically about a rotor axis 14. Coaxially to the dynamic separator part 4, a guide flap ring 6 is provided with guide flaps 7, which are arranged stationarily and optionally adjustable.
- a grinding material-fluid mixture 3 rising from the grinding chamber passes in a rotational flow out of the grinding chamber into the classifying chamber 8, in which the coarse material particles 13 are separated off and fed via a semolina cone 9 as coarse material removal to the comminution.
- Fig. 1 shows that the height H L of the device 10 in this embodiment is about one third of the total height H of the prepare for preparation.
- the device 10 for equalization and spin dissolution of the fine material-fluid flow 11 emerging with an angular momentum from the dynamic separator 4 is designed as a fixed guide 15, which is provided with guide elements 16 arranged and formed in a defined manner.
- the guide elements 16 are arranged for the rotating, rising fine material-fluid flow 11 substantially vertically and radially and attached to a guide tube 18 of the nozzle 15.
- the guide tube 18 of the distributor 15 is circular-cylindrical and arranged coaxially with the rotor axis 14.
- Fig. 3 shows the radial arrangement of the guide elements 16 on the guide tube 18 of the nozzle 15.
- the guide elements 16 extend radially from the guide tube 18 and the guide device 15 extends almost over the entire outlet cross section 27 of the dynamic sifter part 4 and the almost equal inlet cross section of the sifter outlet housing 19, the guide tube 18 already serving as a cover for the corresponding larger diameter can act in the dynamic separator 4 formed pressure sink.
- the radially or radially oriented guide elements 16 of the distributor 15 cause equalization and almost linear alignment of the fine material fluid flow 11 and a reduction in the angular momentum or resolution of the twist.
- the schematic representation of a guide element 16 in Fig. 4 shows the substantially flat or plate-like shape and in a lower region which is located in the installed state near the dynamic separator part 4, a Anström Scheme 17, which in the direction of the incoming fine material-fluid flow 11, that is, opposite to the twisting direction, curved is formed to capture and redirect the emerging from the dynamic separator 4 fine-material-fluid flow 11.
- an outlet opening 12 for the linear fine material-fluid flow 11 is arranged in an upper and lateral area of the classifier outlet housing 19 and directed obliquely upwards.
- the fine material-fluid flow is with a much more uniform distribution of dust or fine particles over a Piping (not shown) a subsequent fine material deposition (not shown) supplied.
- Fig. 2 shows a preferred embodiment of a separator 2 according to the invention, in which the device 10 for equalization and swirl reduction or dissolution next to the nozzle 15 has a displacement body 20.
- the displacement body 20 is arranged coaxially to the rotor axis 14 or mill axis and formed in a vertical section double-cone-shaped, wherein a lower conical or frusto-conical portion 25 extends into the dynamic separator part 4 and almost to a rotor cone 24.
- An upper conical or frusto-conical region 26 is substantially higher than the lower conical region 25, but formed with a smaller conicity and has a height which is approximately two to five times the height of the diffuser.
- the displacement body 20 is arranged and designed such that a pressure sink, which forms due to the rotation of the dynamic sifter part 4, which is a strip rotor in this embodiment, is not effective, so that it does not lead to a backflow of a fine material-fluid portion comes into the rotor center.
- the guide elements 16 of the nozzle 15 are mounted in a lower region of the upper frusto-conical portion 26 of the displacement body 20, wherein the formation and arrangement of the guide elements 16 with their rectifier surfaces as in FIGS. 3 and 4 shown, radiating and can be provided with a curved Anström Society 17.
- the diameter D 2 at the upper end of the displacement body 20 according to the embodiment of the Fig. 2 can in relation to the diameter D R of the diffuser 15, which coincides largely with the inner diameter of the prepare for preparation, are in the range of about 0.35 to 0.6.
- the displacement body may be approximately cylindrical in vertical section.
- the displacement body can also be formed with the rotor around the axis of rotation 14 encircling.
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- Combined Means For Separation Of Solids (AREA)
- Crushing And Grinding (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Sichtung eines Mahlgut-Fluid-Gemisches gemäß dem Oberbegriff des Anspruchs 1 und einen Mühlensichter zur Durchführung des Verfahrens gemäß dem Oberbegriff des Anspruchs 6.The invention relates to a method for the screening of a millbase-fluid mixture according to the preamble of claim 1 and a mill classifier for carrying out the method according to the preamble of claim 6.
Die Erfindung ist insbesondere für Wälzmühlensichter geeignet, welche in einer Walzenschüsselmühle oder in einer Wälzmühle, beispielsweise in einer Luftstrommühle integriert angeordnet oder auf diese aufgesetzt sein können.The invention is particularly suitable for roller mill classifiers, which may be integrated in a roller mill or in a roller mill, for example, in an air flow mill or placed on this.
Die Sichter weisen in der Regel ein dynamisches Sichterteil, beispielsweise einen Leistenrotor, und feststehende Leitschaufeln auf, welche kranzförmig um das dynamische Sicherteil unter Ausbildung eines Sichtraums angeordnet sind. Das Mahlgut-Fluid-Gemisch gelangt in einer aufwärts gerichteten, gehäusenahen Spiralströmung in den Sichtraum, wo die Grobgutpartikel abgetrennt und über einen Grießekonus zur erneuten Zerkleinerung in den Mahlraum zurück fallen. Das in den Leistenrotor gelangende Feingut wird in einem Feingut-Fluid-Strom zum Sichteroberteil und über einen Feingutaustrag und eine Rohrleitung einer Feingutabscheidung zugeführt (
Aus
In
Die Anordnung der Einrichtung zur Strömungsbeeinflussung innerhalb des Sichterrotors und nahe an den Schaufeln des Sichterrotors kann sich nachteilig auf die Sichtung im Sichtraum auswirken und zu einer verminderten Qualität der Sichtung führen. Außerdem ist ein nachträglicher Einbau der Einrichtung oder ein Auswechseln relativ aufwändig.The arrangement of the device for influencing the flow within the classifier rotor and close to the blades of the classifier rotor can adversely affect the sighting in the viewing area and lead to a reduced quality of the sighting. In addition, a subsequent installation of the device or a replacement is relatively expensive.
Bei einem aus
In
Aus
In
Bei einem aus
Der Sichtprozess hat einen großen Einfluss auf die Effizienz einer Mahlanlage. Beispielsweise beeinflusst der Sichtprozess die Laufruhe der Mühle, den Durchsatz an Fertiggut und den Druckverlust der gesamten Anlage. Der Differenzdruck zur Überwindung der Strömungswiderstände im Sichter und die Leistungsaufnahme am Rotor haben einen erheblichen Anteil an der Energiebilanz der gesamten Mahlanlage.The visual process has a great influence on the efficiency of a grinding plant. For example, the visual process influences the smoothness of the mill, the throughput of finished goods and the pressure loss of the entire system. The differential pressure to overcome the flow resistances in the classifier and the power consumption at the rotor have a considerable share in the energy balance of the entire grinding plant.
Der Erfindung liegt die Aufgabe zugrunde, ein Sichtverfahren und einen Mühlensichter zu schaffen, welche die Qualität des Sichtprozesses erhöhen und gleichzeitig zu einer Verbesserung der Energiebilanz sowie einem geringeren investitionstechnischen Aufwand der gesamten Mahlanlage beitragen.The invention has for its object to provide a visual method and a mill classifier, which increase the quality of the visual process and at the same time contribute to an improvement of the energy balance and a lower investment technical effort of the entire grinding plant.
Verfahrensmäßig wird die Aufgabe durch die Merkmale des Anspruchs 1 und in Bezug auf einen Mühlensichter durch die Merkmale des Anspruchs 6 gelöst. Zweckmäßige und vorteilhafte Ausgestaltungen sind in den untergeordneten Ansprüchen sowie in der Figurenbeschreibung enthalten.In terms of method, the object is achieved by the features of claim 1 and in relation to a mill classifier by the features of claim 6. Advantageous and advantageous embodiments are contained in the subordinate claims and in the description of the figures.
Ein Grundgedanke der Erfindung kann darin gesehen werden, den Feingut-Fluid-Strom, welcher aus dem dynamischen Sichterteil aufgrund der Rotation des Rotors in einer Rotationsbewegung beziehungsweise unter einem Drall austritt, zu vergleichmäßigen und eine Drallauflösung beziehungsweise wenigstens eine erhebliche Verringerung des Dralls zu erreichen.A basic idea of the invention can be seen in the fact that the fine material-fluid stream which emerges from the dynamic separator part due to the rotation of the rotor in a rotational movement or under a twist, to uniform and achieve a twist resolution or at least a significant reduction of the twist.
Die Ausprägung des Dralls ist abhängig von der Umfangsgeschwindigkeit des Rotors, welche sich wiederum nach der zu sichtenden Partikelgröße richtet. Feinere Aussichtungen erfordern eine höhere Umfangsgeschwindigkeit als gröbere Aussichtungen.The expression of the twist is dependent on the peripheral speed of the rotor, which in turn depends on the particle size to be observed. Finer views require a higher peripheral speed than rougher views.
Die mit einem Drehimpuls aus dem dynamischen Sichterteil austretende Feingut-Fluid-Strömung ist unter verschiedenen Aspekten nachteilig. So wird das Feingut beziehungsweise der Staub der Zweiphasenströmung aufgrund der durch den Drall erzeugten Fliehkraft an die Wandung des Sichteroberteils gepresst, wo aufgrund der Reibung Strömungsverluste und Verschleiß entstehen. Außerdem wurde festgestellt, dass sich sogenannte "Staubsträhnen" bilden, welche in Bezug auf den Feingut-Fluid-Strom zu einer ungleichmäßigen Verteilung der Feingutpartikel im Sichter und auch im nachgeschalteten Staubabscheider führt. Als Staubabscheider können Zyklone und/oder Filter, beispielsweise ein Schlauchfilter, vorgesehen sein. Bei Sichtverfahren und Sichtern ohne oder nur unzureichender Drallauflösung wurde in vielen Fällen eine Überdimensionierung der Staubabscheider vorgenommen.The fine-material-fluid flow emerging with an angular momentum from the dynamic separator part is disadvantageous in various aspects. Thus, the fine material or the dust of the two-phase flow is pressed due to the centrifugal force generated by the swirl on the wall of the Sichteroberteils, where due to the friction flow losses and wear. In addition, it was found that so-called "dust strands" form, which leads with respect to the fine material-fluid flow to an uneven distribution of the fines particles in the classifier and also in the downstream dust collector. Cyclones and / or filters, for example a bag filter, may be provided as dust separators. In visual processes and classifiers with no or only insufficient spin dissolution, overdimensioning of the dust collectors was carried out in many cases.
Bei dem erfindungsgemäßen Sichtverfahren wird der Drall der aus dem dynamischen Sichterteil austretenden Zweiphasenströmung aufgelöst oder wenigstens erheblich reduziert und diese in Form einer annähernd linearen Strömung vom Sichter in das nachgeschaltete Abscheideaggregat gefördert. Durch die Auflösung des Dralls wird eine nachteilige Speicherung von Strömungsenergie vermieden und eine erhebliche Einsparung im Differenzdruck beziehungsweise Energieverbrauch erreicht.In the method according to the invention, the swirl of the two-phase flow emerging from the dynamic separator part is dissolved or at least considerably reduced and conveyed in the form of an approximately linear flow from the separator into the downstream separation unit. The dissolution of the twist avoids disadvantageous storage of flow energy and achieves a considerable saving in differential pressure or energy consumption.
Die erfindungsgemäße Vergleichmäßigung des Feingut-Fluid-Stroms nach Austritt aus dem dynamischen Sichterteil umfasst somit eine Verringerung oder Auflösung des Drehimpulses der aus dem Rotor austretenden Feingut-Fluid-Strömung direkt oberhalb des Austrittsquerschnitts des dynamischen Sichterteils und die Bildung einer linearen Strömung bis zur Austrittsöffnung des Sichters und bis in die nachgeschalteten Aggregate.The equalization according to the invention of the fine material-fluid flow after exiting the dynamic separator part thus comprises a reduction or resolution of the angular momentum of the fine-fluid flow emerging from the rotor directly above the outlet cross-section of the dynamic separator part and the formation of a linear flow up to the outlet opening of the Sichters and down to the downstream units.
Gleichzeitig umfasst die Vergleichmäßigung des Feingut-Fluid-Stroms eine Umlenkung von einer spiralförmig aufsteigenden Strömung in eine nahezu vertikale Strömung mit Hilfe eines Leitapparates, welcher in einem Sichteraustrittsgehäuse oberhalb des Austrittsquerschnitts des dynamischen Sichterteils angeordnet ist.At the same time, the homogenization of the fine material-fluid flow comprises a deflection from a spiraling flow into a nearly vertical flow with the aid of a diffuser, which is arranged in a classifier outlet housing above the outlet cross-section of the dynamic classifier.
Gemäß der Erfindung ist außerdem vorgesehen, den Feingut-Fluid-Strom zusätzlich zu dem Leitapparat einem Verdrängungskörper auszusetzen. Dieser Verdrängungskörper wird zweckmäßigerweise derart ausgebildet und angeordnet, dass die Nachteile einer sich aufgrund der Rotation des dynamischen Sichterteils bildenden Drucksenke weitgehend vermieden werden. Die Drucksenke beziehungsweise Potenzialwirbelsenke speichert die Strömungsenergie in Form von Drehimpuls. Gleichzeitig wird ein Teil des Feingut-Fluid-Stroms in den Rotorinnenraum eingezogen, wodurch eine Rückströmung in das Rotorzentrum erfolgt und die Mahlgutpartikel auf den Rotorboden fallen. Indem der Verdrängungskörper derart ausgebildet und angeordnet ist, dass die Drucksenke abgedeckt wird und damit ihre Wirkung nicht entfalten kann, wird eine weitere Vergleichmäßigung und ein effizienter Feingut-Fluid-Austrag ohne Rückströmung in das dynamische Sicherteil erreicht.According to the invention, it is also provided to expose the fine material-fluid flow in addition to the distributor to a displacement body. This displacement body is expediently designed and arranged in such a way that the disadvantages of a pressure sink forming on account of the rotation of the dynamic separator part are largely avoided. The pressure sink or potential vortex sink stores the flow energy in the form of angular momentum. At the same time a part of the fine material-fluid flow is drawn into the rotor interior, whereby a backflow into the rotor center takes place and the regrind particles fall onto the rotor bottom. By the displacement body is designed and arranged so that the pressure sink is covered and thus can not develop their effect, a further homogenization and an efficient fine-material fluid discharge is achieved without backflow into the dynamic safety part.
Ein erfindungsgemäßer Mühlensichter, welcher mit einem Leitklappenkranz und einem dynamischen Sichterteil unter Ausbildung eines Sichtraums sowie mit einer Grobgutabführung und wenigstens einer Austragsöffnung für einen Feingut-Fluid-Strom versehen ist, weist eine Einrichtung zur Vergleichmäßigung und Drallauflösung stromabwärts nach dem dynamischen Sichterteil in einem Sichteraustrittsgehäuse auf.An inventive mill classifier, which is provided with a Leitklappenkranz and a dynamic separator portion to form a Sichtraums and with a Groggutabführung and at least one discharge opening for a fine material-fluid flow, has a device for equalization and spin dissolution downstream of the dynamic separator part in a Sichteraustrittsgehäuse ,
Bevorzugt handelt es sich bei dem erfindungsgemäßen Mühlensichter um einen in eine Luftstrom-Wälzmühle integrierten oder aufgesetzten Sichter mit einem Leistenrotor als dynamischem Sichterteil und mit einem Grießekonus zur Abführung der Grobgutpartikel aus dem Sichtraum und Rückführung in den Mahlraum zur erneuten Zerkleinerung. Als Einrichtung zur Vergleichmäßigung und Drallauflösung des aus dem dynamischen Sichterteil austretenden Feingut-Fluid-Stroms ist erfindungsgemäß ein Leitapparat mit Leitelementen vorgesehen, welcher den Feingut-Fluid-Strom strömungsgünstig beeinflusst.Preferably, the mill classifier according to the invention is a classifier integrated into or attached to an air flow roller mill with a strip rotor as the dynamic separator part and with a semolina cone for discharging the coarse material particles from the classifying chamber and returning them to the grinding chamber for further comminution. As a device for equalization and spin dissolution of emerging from the dynamic separator part fines-fluid flow according to the invention a nozzle with guide elements is provided, which influences the fine material-fluid flow aerodynamically.
Erfindungsgemäß ist außerdem ein Verdrängungskörper, insbesondere koaxial zur Sichter- beziehungsweise Rotorachse, angeordnet.According to the invention, a displacement body, in particular coaxial with the classifier or rotor axis, is also arranged.
Vorteilhaft ist es, wenn die Einrichtung zur Vergleichmäßigung und Drallauflösung des aus dem dynamischen Sichterteil austretenden Feingut-Fluid-Stroms feststehend ausgebildet ist und außerdem der Leitapparat mit dem Verdrängungskörper eine Einheit bildet.It is advantageous if the device for equalization and spin dissolution of the fine material-fluid flow emerging from the dynamic separator part is designed to be stationary and, in addition, the distributor device forms a unit with the displacement body.
Der Leitapparat ist erfindungsgemäß oberhalb eines Austrittsquerschnitts des dynamischen Sichterteils in dem Sichteraustrittsgehäuse angeordnet. Der Verdrängungskörper reicht zweckmäßigerweise über den Leitapparat hinaus und kann beispielsweise eine Höhe aufweisen, welche das Zwei- bis Fünffache der Höhe des Leitapparats beträgt.The distributor is arranged according to the invention above an outlet cross-section of the dynamic separator in the Sichteraustrittsgehäuse. The displacement body expediently extends beyond the distributor and may, for example, have a height which is two to five times the height of the distributor.
Der Verdrängungskörper kann zweckmäßigerweise mit einem unteren, beispielsweise konischen Bereich in das dynamische Sichterteil ragen und die Ausbildung einer Drucksenke verhindern. Wenn das dynamische Sichterteil ein Leistenrotor mit einem nach oben gerichteten Rotorkonus ist, kann der untere konische Bereich des Verdrängungskörpers bis nahe an diesen Rotorkonus reichen. In einer bevorzugten Ausführungsform ist der Verdrängungskörper als ein Doppelkonus ausgebildet, bei welchem der obere konische beziehungsweise kegelstumpfförmige Bereich eine geringere Konizität als der untere konische beziehungsweise kegelstumpfförmige Bereich aufweist.The displacement body can expediently protrude with a lower, for example conical region in the dynamic separator part and prevent the formation of a pressure sink. If the dynamic sifter is a ridge rotor with an upwardly directed rotor cone, the lower conical portion of the pusher body can reach close to that rotor cone. In a preferred embodiment, the displacement body is formed as a double cone, in which the upper conical or frusto-conical region has a lower conicity than the lower conical or frusto-conical region.
Speziell bei kleineren Mühlensichtern kann der Verdrängungskörper auch vereinfachend im Achsschnitt im Wesentlichen zylindrisch ausgebildet sein.Especially with smaller mill classifiers, the displacement body can also be simplistic in axial section substantially cylindrical.
Abhängig von der Spezifikation des Mühlensichters kann auch ein mit dem Rotor mitrotierender Verdrängungskörper vorgesehen werden.Depending on the specification of the mill classifier, a displacement body co-rotating with the rotor can also be provided.
Bezogen auf den Durchmesser eines Sichteraustrittsgehäuses, in welchem Leitapparat und Verdrängungskörper aufgenommen sind, kann der Durchmesser D2 am oberen Ende des Verdrängungskörpers im Verhältnis zum Durchmesser des Sichteraustrittsgehäuses beziehungsweise Innendurchmesser DR des Rotors im Bereich von 0,35 bis 0,6 liegen.Based on the diameter of a Sichteraustrittsgehäuses, in which the nozzle and displacer are accommodated, the diameter D 2 at the upper end of the displacer in relation to the diameter of the Sichteraustrittsgehäuses or inner diameter D R of the rotor in the range of 0.35 to 0.6 are.
Grundsätzlich kann der Leitapparat die unterschiedlichste Ausbildung aufweisen, um die mit einem Drehimpuls aus dem dynamischen Sichterteil austretende Feingut-Fluid-Strömung einzufangen und in eine im Wesentlichen vertikale lineare Strömung umzulenken.In principle, the diffuser can have the most diverse design in order to capture the fine material-fluid flow exiting with an angular momentum from the dynamic separator part and divert it into a substantially vertical linear flow.
Der Leitapparat kann ebene beziehungsweise plattenförmige Leitelemente, welche strahlenförmig angeordnet sind, aufweisen. Beispielsweise können die Leitelemente als Bleche ausgebildet sein und an einem Führungsrohr befestigt werden, welches zweckmäßigerweise koaxial zur Rotorachse angeordnet ist. Zur Drallauflösung und Umlenkung des rotierenden Feingut-Fluid-Stroms ist es zweckmäßig, die Leitelemente mit einem Anströmbereich auszubilden, welcher zum Anströmen durch die Feingut-Fluid-Mischung in einem unteren, rotornahen Bereich entgegen der Drallrichtung gekrümmt ausgebildet ist.The distributor can have flat or plate-shaped guide elements, which are arranged in a radial manner. For example, the guide elements may be formed as sheets and fastened to a guide tube, which is expediently arranged coaxially to the rotor axis. For swirl dissolution and deflection of the rotating fine material-fluid stream, it is expedient to form the guide elements with an inflow region, which for influx through the fine material-fluid mixture is formed curved in a lower region near the rotor against the twisting direction.
Die Leitelemente können auch bogen- und/oder schaufelförmig beziehungsweise sphärisch ausgebildet sein, um den Feingut-Fluid-Strom strömungsgünstig einzufangen und gleitend beziehungsweise sanft in eine vertikale Strömungsrichtung umzulenken.The guide elements can also be arcuate and / or blade-shaped or spherical in order to capture the fine material-fluid flow in a streamlined manner and to redirect it in a sliding or gentle manner in a vertical flow direction.
Bei der bevorzugten Ausbildung der Einrichtung zur Vergleichmäßigung und Drallreduzierung beziehungsweise Auflösung mit einem Leitapparat und einem Verdrängungskörper ist es besonders vorteilhaft, dass die Leitelemente mit ihren Gleichrichterflächen am Außenumfang des Verdrängungskörpers befestigt werden können. Zweckmäßigerweise erfolgt das in einem unteren Bereich des oberen konus- beziehungsweise kegelstumpfförmigen Bereich des Verdrängungskörpers, so dass ein größerer Bereich über die Leitelemente nach oben übersteht und zur Vergleichmäßigung und linearen Strömung der Feingut-Fluid-Mischung beiträgt.In the preferred embodiment of the device for equalization and swirl reduction or resolution with a diffuser and a displacement body, it is particularly advantageous that the guide elements can be attached with their rectifier surfaces on the outer circumference of the displacement body. Conveniently, this takes place in a lower region of the upper conical or frustoconical region of the displacement body, so that a larger area protrudes upward beyond the guide elements and contributes to the homogenization and linear flow of the fine material / fluid mixture.
Indem der Drall aufgelöst beziehungsweise der Drehimpuls erheblich verringert wird, wird die Bildung von Turbulenzen reduziert und die Vermischung der Feingutpartikel beziehungsweise der Staubpartikel mit dem Fluid, beispielsweise Luft, wirkungsvoll unterstützt.By the swirl dissolved or the angular momentum is significantly reduced, the formation of turbulence is reduced and the mixing of the fine particles or the dust particles with the fluid, such as air, effectively supported.
Es ist zweckmäßig, ein Sichteraustrittsgehäuse vorzusehen, welches eine weitere vertikale Aufwärtsströmung des vergleichmäßigten, linearen Feingut-Fluid-Gemisches zwischen dem Verdrängungskörper und Sichtergehäuse ermöglicht. Beispielsweise kann das Sichteraustrittsgehäuse zur integrierten Anordnung des Leitapparates und vorteilhafterweise des Verdrängungskörpers ausgebildet sein und eine Gesamthöhe H aufweisen, welche in Bezug auf die Höhe HL des Leitapparates zweimal bis viermal größer ist. Das Sichteraustrittsgehäuse ist zweckmäßigerweise zylindrisch oder konisch ausgebildet und weist in einem oberen und/oder seitlichen Bereich wenigstens eine Austrittsöffnung für den umgelenkten, linearen Feingut-Fluid-Stroms auf. Ein Austrittsstutzen für den in Richtung Staubabscheider abströmenden Feingut-Fluid-Strom kann insbesondere seitlich schräg oder horizontal angeordnet sein.It is expedient to provide a Sichteraustrittsgehäuse which allows a further vertical upward flow of the uniform, linear fine material-fluid mixture between the displacement body and classifier housing. For example, the Sichteraustrittsgehäuse be designed for integrated arrangement of the nozzle and advantageously the displacement body and have an overall height H, which is twice to four times greater in relation to the height H L of the nozzle. The Sichteraustrittsgehäuse is expediently cylindrical or conical and has in an upper and / or lateral area at least one outlet opening for the deflected, linear fine material-fluid flow. An outlet connection for the fine-material-fluid stream flowing out in the direction of the dust separator can, in particular, be arranged laterally obliquely or horizontally.
Es ist vorteilhaft, wenn der Verdrängungskörper bei einer seitlichen Anordnung des Austrittsstutzens bis über die Unterkante des Austrittsstutzens reicht.It is advantageous if the displacement body extends in a lateral arrangement of the outlet nozzle over the lower edge of the outlet nozzle.
Die Vorteile des erfindungsgemäßen Sichtverfahrens und des Mühlensichters gemäß der Erfindung bestehen in einer nahezu drallfreien, gut vermischten Feingut-Fluid-Mischung beziehungsweise Staub-Luft-Strömung mit einer gleichmäßigen Staubverteilung am Sichteraustritt und damit auch am Eintrittsquerschnitt des nachfolgenden Staubabscheiders. Indem ein Rückströmen eines Anteils des Feingut-Fluid-Stroms in das Rotorzentrum mit Hilfe des Verdrängungskörpers der erfindungsgemäßen Einrichtung vermieden wird, da die sich ausbildende Drucksenke quasi abgedeckt wird, wird ein Ausfallen von Mahlgutpartikeln auf den Rotorboden verhindert und die Effizienz des Sichtprozesses erhöht.The advantages of the method according to the invention and the mill classifier according to the invention consist in a virtually swirl-free, well-mixed fine material-fluid mixture or dust-air flow with a uniform dust distribution at the classifier outlet and thus also at the inlet cross-section of the subsequent dust collector. By avoiding a return flow of a portion of the fine material-fluid flow into the rotor center with the aid of the displacement body of the device according to the invention, since the pressure sink which forms is virtually covered, precipitation of regrind particles onto the rotor bottom is prevented and the efficiency of the visual process is increased.
Die gleichmäßigere Staubverteilung bewirkt einen geringeren Luftbedarf für den pneumatischen Transport des Staubs beziehungsweise der Feingutpartikel, verbunden mit einem geringeren Verschleiß an den Wänden des Sichtergehäuses. Die erfindungsgemäße Drallauflösung verringert den Druckverlust im Sichter und damit auch die Leistungsaufnahme des Sichterantriebes. Gleichzeitig kommt es zu einer verbesserten Anströmung des nachfolgenden Staubabscheiders, beispielsweise eines Filters, und damit zu einer Vermeidung einer Überdimensionierung dieses Staubabscheiders. Auch das Sichteraustrittsgehäuse kann eine einfache Konstruktion aufweisen. Wesentlich sind eine Energierückgewinnung beziehungsweise -reduzierung und ein wesentlich besserer Wirkungsgrad bei der nachgeschalteten Stauabscheidung infolge einer gleichmäßigeren Verteilung des Staubes auf einzelne Filterkammern (Module) beziehungsweise eine gleichmäßigere Aufteilung auf Abscheidezyklone. Neben einer Verbesserung des Sichtprozesses und damit auch des Mahlprozesses wird somit eine erhebliche Effizienzsteigerung beim Betreiben einer Mahlanlage erreicht.The more even distribution of dust results in lower air consumption for the pneumatic transport of the dust or fine particles, with less wear on the walls of the classifier housing. The twist resolution according to the invention reduces the pressure loss in the classifier and thus also the power consumption of the classifier drive. At the same time there is an improved flow of the subsequent dust collector, such as a filter, and thus to avoid overdimensioning of this dust collector. The Sichteraustrittsgehäuse may also have a simple construction. Essential are energy recovery or reduction and a much better efficiency in the downstream storage separation due to a more uniform distribution of the dust on individual filter chambers (modules) or a more even distribution on Abscheidezyklone. In addition to an improvement of the visual process and thus also the milling process thus a considerable increase in efficiency is achieved when operating a grinding plant.
Das erfindungsgemäße Verfahren ist bevorzugt für Luftstrom-Wälzmühlen mit einem integrierten Sichter geeignet, jedoch nicht auf diese begrenzt. Die Einrichtung zur Drallauflösung beziehungsweise Drallreduzierung kann grundsätzlich bei allen Sichtern mit einem dynamischen rotierenden Sichterteil verwendet werden. Es ist vorteilhaft, dass die Anordnung der erfindungsgemäßen Einrichtung zur Drallauflösung mit einem Leitapparat und mit einem Verdrängungskörper vorgefertigt und außerdem nachträglich in einen Sichter eingebaut oder auf diesen aufgesetzt werden kann.The method according to the invention is preferably suitable for air flow roller mills with a built-in classifier, but not limited to these. The device for spin dissolution or swirl reduction can basically be used in all classifiers with a dynamic rotating separator part. It is advantageous that the arrangement of the device according to the invention for swirl dissolution prefabricated with a diffuser and with a displacement body and also can be retrofitted in a classifier or placed on this.
Die Erfindung wird nachfolgend anhand einer Zeichnung weiter erläutert; in dieser zeigen in einer stark schematisierten Darstellung:
- Fig. 1
- einen erfindungsgemäßen Mühlensichter mit einem Leitapparat;
- Fig. 2
- einen erfindungsgemäßen Mühlensichter mit einem Leitapparat und einem Verdrängungskörper;
- Fig. 3
- einen Horizontalschnitt gemäß Linie II-II in
Fig. 1 und - Fig. 4
- eine perspektivische Darstellung eines Leitelementes eines Leitapparates des erfindungsgemäßen Mühlensichters.
- Fig. 1
- a mill classifier according to the invention with a nozzle;
- Fig. 2
- a mill classifier according to the invention with a nozzle and a displacement body;
- Fig. 3
- a horizontal section along the line II-II in
Fig. 1 and - Fig. 4
- a perspective view of a guide element of a nozzle of the mill classifier according to the invention.
Der Mühlensichter 2 weist ein dynamisches Sichterteil 4 auf, welches in diesem Ausführungsbeispiel ein Leistenrotor mit konzentrisch um eine Rotorachse 14 angeordneten Rotorleisten 5 ist. Koaxial zu dem dynamischen Sichterteil 4 ist ein Leitklappenkranz 6 mit Leitklappen 7 vorgesehen, welche stationär und gegebenenfalls verstellbar angeordnet sind. Ein aus dem Mahlraum aufsteigendes Mahlgut-Fluid-Gemisch 3 gelangt in einer Rotationsströmung aus dem Mahlraum in den Sichtraum 8, in welchem die Grobgutpartikel 13 abgeschieden und über einen Grießekonus 9 als Grobgutabführung der erneuten Zerkleinerung zugeführt werden.The
Ein Feingut-Fluid-Strom 11, welcher auch als Staub-Luft-Gemisch bezeichnet werden kann, gelangt über einen Austrittsquerschnitt 27 des dynamischen Sichterteils 4 in ein Sichteraustrittsgehäuse 19, welches eine Höhe H aufweist und sich vom Austrittsquerschnitt 27 des dynamischen Sichterteils 4 nach oben erstreckt.A fine material-
In einem unteren, nahezu direkt an das dynamische Sicherteil 4 anschließenden Bereich des Sichteraustrittsgehäuses 19 ist eine Einrichtung 10 zur Vergleichmäßigung und Drallauflösung des mit einem Drehimpuls aus dem dynamischen Sichterteil 4 austretenden Feingut-Fluid-Stroms 11 angeordnet.In a lower, almost directly adjoining the
Die Einrichtung 10 zur Vergleichmäßigung und Drallauflösung des mit einem Drehimpuls aus dem dynamischen Sichterteil 4 austretenden Feingut-Fluid-Stroms 11 ist als ein feststehender Leitapparat 15 ausgebildet, welcher mit definiert angeordneten und ausgebildeten Leitelementen 16 versehen ist.The
Beim vorliegenden Ausführungsbeispiel sind die Leitelemente 16 für den rotierenden, aufsteigenden Feingut-Fluid-Strom 11 im Wesentlichen vertikal sowie strahlenförmig angeordnet und an einem Führungsrohr 18 des Leitapparates 15 befestigt. Das Führungsrohr 18 des Leitapparates 15 ist dabei kreiszylindrisch ausgebildet und koaxial zur Rotorachse 14 angeordnet.In the present embodiment, the
Die strahlenförmig, beziehungsweise radial ausgerichteten Leitelemente 16 des Leitapparats 15 bewirken eine Vergleichmäßigung und nahezu lineare Ausrichtung des Feingut-Fluid-Stroms 11 und eine Verringerung des Drehimpulses beziehungsweise Auflösung des Dralls.The radially or radially oriented
Die schematische Darstellung eines Leitelementes 16 in
Beim Sichter 2 gemäß
Die Bauteile des Sichters 2 gemäß
Der Verdrängungskörper 20 ist koaxial zur Rotorachse 14 beziehungsweise Mühlenachse angeordnet und im Vertikalschnitt doppelkonusförmig ausgebildet, wobei ein unterer konischer beziehungsweise kegelstumpfförmiger Bereich 25 in das dynamische Sichterteil 4 und bis nahezu an einen Rotorkonus 24 reicht.The
Ein oberer konischer beziehungsweise kegelstumpfförmiger Bereich 26 ist wesentlich höher als der untere konische Bereich 25, jedoch mit einer geringeren Konizität ausgebildet und weist eine Höhe auf, welche etwa das Zwei- bis Fünffache der Höhe des Leitapparates beträgt. In Bezug auf das Sichteraustrittsgehäuse 19 reicht der Verdrängungskörper 20 bis über die halbe Höhe des Sichteraustrittsgehäuses 19 und über die untere Kante der Austrittsöffnung 12 für das vergleichmäßigte, linear strömende Feingut-Fluid-Gemisch 11.An upper conical or frusto-
Der Verdrängungskörper 20 ist derart angeordnet und ausgebildet, dass eine Drucksenke, welche sich infolge der Rotation des dynamischen Sichterteils 4, welches in diesem Ausführungsbeispiel ein Leistenrotor ist, ausbildet, nicht wirksam wird, so dass es nicht zu einer Rückströmung eines Feingut-Fluid-Anteils in das Rotorzentrum kommt.The
Die Leitelemente 16 des Leitapparates 15 sind in einem unteren Bereich des oberen kegelstumpfförmigen Bereichs 26 des Verdrängungskörpers 20 befestigt, wobei die Ausbildung und Anordnung der Leitelemente 16 mit ihren Gleichrichterflächen wie in den
Der Durchmesser D2 am oberen Ende des Verdrängungskörpers 20 gemäß dem Ausführungsbeispiel der
Insbesondere bei kleineren Sichtern kann der Verdrängungskörper im Vertikalschnitt etwa zylindrisch ausgebildet sein.Especially with smaller classifiers, the displacement body may be approximately cylindrical in vertical section.
Abhängig vom Typ des Mühlensichters kann der Verdrängungskörper auch mit dem Rotor um die Rotationsachse 14 umlaufend ausgebildet werden.Depending on the type of mill classifier, the displacement body can also be formed with the rotor around the axis of
Claims (24)
- Method for classifying a ground material-fluid mixture, in particular from a roller mill,
wherein coarse material is separated from the ground material-fluid mixture using a dynamic classifier part and a fine material-fluid flow is made uniform and discharged using a device,
characterised in that
the fine material-fluid flow leaving the dynamic classifier part with an angular momentum is fed to a classifier outlet housing above an outlet cross-section of the dynamic classifier part and made uniform in the classifier outlet housing and before the classifier outlet and subjected to a swirl reduction or swirl elimination and additionally exposed to a displacement body. - Method according to claim 1,
characterised in that
the fine material-fluid flow in the classifier outlet housing is fed to a guiding apparatus and the displacement body, deflected into a linear flow and after leaving the classifier is fed for a dust separation. - Method according to claim 1 or 2,
characterised in that
the fine material-fluid flow entering the classifier outlet housing is collected and deflected by guide plates of a guiding apparatus. - Method according to claim 3,
characterised in that
the deflected, virtually linear fine material-fluid flow is discharged via at least one outlet opening of the classifier outlet housing and subjected to the dust separation. - Method according to one of the claims 1 to 4,
characterised in that
a pressure drop formed as a result of the rotation of the dynamic classifier part is covered by the displacement body. - Mill classifier for a ground material-fluid mixture,
having a dynamic classifier part (4) and a guide vanes ring (6), of which the guide vanes (7) surround the dynamic classifier part (4) at least in areas, thereby forming a classification chamber (8), a coarse material removal and a device (10) for homogenization and swirl elimination of the fine material-fluid flow (11) leaving the dynamic classifier part (4) with an angular momentum, and at least one discharge opening (12) for the fine material-fluid flow (11), in particular for carrying out the method according to any one of the claims 1 to 5,
characterised in that
a classifier outlet housing (19) is arranged in relation to the flow direction after the dynamic classifier part (4) and above an outlet cross-section (27) of the dynamic classifier part (4),
in the classifier outlet housing (19) as a device (10) for homogenization and swirl elimination of the fine material-fluid flow (11) leaving the dynamic classifier part (4) with an angular momentum a guiding apparatus (15) for a rising fine material-fluid flow (11) and a displacement body (20) are disposed and
the outlet opening (12) for the homogenized, linear fine material-fluid flow (11) is arranged spaced apart from the guiding apparatus (15) in an upper and / or lateral region of the classifier outlet housing (19). - Mill classifier according to claim 6,
characterised in that
the device (10) is formed such that the fine material-fluid flow (11) leaving the dynamic classifier part (4) is collected in a flow-enhancing way and deflected into a virtually linear flow. - Mill classifier according to claim 6 or 7,
which is placed on or integrated into a roller mill, in particular an air-swept roller mill, and comprises as a dynamic classifier part (4) a bladed rotor with rotor blades (5) arranged concentrically around a rotor axis (14) and as a coarse material removal for the coarse material particles (13) separated in the classifier chamber (8) a grit cone (9),
characterised in that
the device (10) for homogenization and swirl elimination of the fine material-fluid flow (11) leaving the dynamic classifier part (4) and entering the classifier outlet housing (19) has a fixed construction. - Mill classifier according to one of the claims 6 to 8,
characterised in that
the displacement body (20) is arranged to cover a pressure drop formed in the region through rotation of the dynamic classifier part (4). - Mill classifier according to claim 8 or 9,
characterised in that
the displacement body (20) and the guiding apparatus (15) are formed as one unit and arranged coaxially with the rotor axis (14) in the classifier outlet housing (19). - Mill classifier according to claims 8 to 10,
characterised in that
the guiding apparatus (15) comprises guide elements (16) which are radially arranged. - Mill classifier according to one of the claims 8 to 11,
characterised in that
the guide elements (16) are virtually planar and have an inflow region (17) with a curvature only in a region close to the dynamic classifier part (4). - Mill classifier according to one of the claims 8 to 11,
characterised in that
the guide elements (16) for the inflow of the fine material-fluid flow (11) leaving the dynamic classifier part (4) are formed in the shape of an arc, blade or spherically. - Mill classifier according to one of the claims 8 to 13,
characterised in that
the guide elements (16) are fixed to a guide tube (18) of the guiding apparatus (15) or to the displacement body (20) and are vertically orientated. - Mill classifier according to one of the claims 8 to 14,
characterised in that
the displacement body (20) has the form of a double cone in its vertical section and comprises a lower conical region which extends into the dynamic classifier part (4) and for example runs up to the vicinity of a rotor cone (24) which is orientated towards the classifier outlet housing (19). - Mill classifier according to one of the claims 8 to 15,
characterised in that
the displacement body (20) comprises an upper conical region (26), on which the guide elements (16) are fixed close to the dynamic classifier part (4) and in that the upper conical region (26) of the displacement body (20) extends beyond the guide elements (16). - Mill classifier according to one of the claims 8 to 16,
characterised in that
the upper conical region (26) of the displacement body (20) exhibits a lower conicity than the lower conical region (25) and in that the height of the displacement body (20) is two to five times the height of the guiding apparatus (15). - Mill classifier according to one of the claims 8 to 17,
characterised in that
the displacement body (20) has a diameter D2 at the upper end which has a ratio of 0.35 to 0.6 in relation to the diameter DR of the classifier outlet housing (19) or the guiding apparatus (15) respectively or the inner diameter of the dynamic classifier part (4). - Mill classifier according to one of the claims 8 to 18,
characterised in that
the guiding apparatus (15) and a cylindrical guide tube (18) or a double cone shaped displacement body (20) are arranged in a cylindrical classifier outlet housing (19) with an overall height H and in that the guiding apparatus (15) has a height HL which is around a third to a fifth of the overall height H of the classifier outlet housing (19). - Mill classifier according to one of the claims 8 to 19,
characterised in that
the guide elements (16) extend radially from the guide tube (18) or displacement body (20) up to the vicinity of the inner wall of the classifier outlet housing (19). - Mill classifier according to one of the claims 8 to 20,
characterised in that
the guide elements (16) of the guiding apparatus (15) are formed as metal plates. - Mill classifier according to one of the claims 8 to 21,
characterised in that
the displacement body (20) is arranged with the upper conical region (26) on the end side approximately at the height of the discharge opening (12). - Mill classifier according to claim 8,
characterised in that
the displacement body (20) is formed as a body rotating with the rotor (4, 14). - Mill classifier according to one of the claims 8 to 14 or 18 to 21 or 23,
characterised in that
the displacement body (20) is approximately cylindrical in the vertical section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL09777119T PL2254708T3 (en) | 2008-08-12 | 2009-07-10 | Process for sifting a mixture of a milled material and a fluid, and mill sifter |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008038776.2A DE102008038776B4 (en) | 2008-08-12 | 2008-08-12 | Process for the screening of a millbase fluid mixture and mill classifier |
| PCT/EP2009/005039 WO2010017865A2 (en) | 2008-08-12 | 2009-07-10 | Process for sifting a mixture of a milled material and a fluid, and mill sifter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2254708A2 EP2254708A2 (en) | 2010-12-01 |
| EP2254708B1 true EP2254708B1 (en) | 2011-09-28 |
Family
ID=41549900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09777119A Active EP2254708B1 (en) | 2008-08-12 | 2009-07-10 | Process for sifting a mixture of a milled material and a fluid, and mill sifter |
Country Status (21)
| Country | Link |
|---|---|
| US (2) | US8453846B2 (en) |
| EP (1) | EP2254708B1 (en) |
| JP (1) | JP5200168B2 (en) |
| KR (1) | KR101289841B1 (en) |
| CN (1) | CN102123798B (en) |
| AR (1) | AR075746A1 (en) |
| AT (1) | ATE526093T1 (en) |
| BR (1) | BRPI0917672A8 (en) |
| CA (1) | CA2731691C (en) |
| CL (1) | CL2011000213A1 (en) |
| DE (1) | DE102008038776B4 (en) |
| DK (1) | DK2254708T3 (en) |
| EA (1) | EA020660B1 (en) |
| ES (1) | ES2370595T3 (en) |
| MX (1) | MX2011000954A (en) |
| MY (1) | MY159928A (en) |
| PE (1) | PE20110483A1 (en) |
| PL (1) | PL2254708T3 (en) |
| UA (1) | UA101045C2 (en) |
| WO (1) | WO2010017865A2 (en) |
| ZA (1) | ZA201100499B (en) |
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| PL233435B1 (en) * | 2016-04-14 | 2019-10-31 | Sosnowski Wlodzimierz | Device for separation and removal of light impurities from grainy materials |
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-
2008
- 2008-08-12 DE DE102008038776.2A patent/DE102008038776B4/en not_active Expired - Fee Related
-
2009
- 2009-07-10 BR BRPI0917672A patent/BRPI0917672A8/en not_active IP Right Cessation
- 2009-07-10 PE PE2011000074A patent/PE20110483A1/en not_active Application Discontinuation
- 2009-07-10 PL PL09777119T patent/PL2254708T3/en unknown
- 2009-07-10 MY MYPI2011000539A patent/MY159928A/en unknown
- 2009-07-10 UA UAA201101478A patent/UA101045C2/en unknown
- 2009-07-10 MX MX2011000954A patent/MX2011000954A/en active IP Right Grant
- 2009-07-10 EP EP09777119A patent/EP2254708B1/en active Active
- 2009-07-10 EA EA201100186A patent/EA020660B1/en not_active IP Right Cessation
- 2009-07-10 JP JP2011522391A patent/JP5200168B2/en not_active Expired - Fee Related
- 2009-07-10 ES ES09777119T patent/ES2370595T3/en active Active
- 2009-07-10 WO PCT/EP2009/005039 patent/WO2010017865A2/en active Application Filing
- 2009-07-10 CA CA2731691A patent/CA2731691C/en not_active Expired - Fee Related
- 2009-07-10 AT AT09777119T patent/ATE526093T1/en active
- 2009-07-10 DK DK09777119.0T patent/DK2254708T3/en active
- 2009-07-10 CN CN200980131483.6A patent/CN102123798B/en not_active Expired - Fee Related
- 2009-07-10 US US13/058,506 patent/US8453846B2/en not_active Expired - Fee Related
- 2009-07-10 KR KR1020117003148A patent/KR101289841B1/en not_active IP Right Cessation
- 2009-08-11 AR ARP090103092A patent/AR075746A1/en not_active Application Discontinuation
-
2011
- 2011-01-20 ZA ZA2011/00499A patent/ZA201100499B/en unknown
- 2011-01-31 CL CL2011000213A patent/CL2011000213A1/en unknown
-
2013
- 2013-05-24 US US13/902,712 patent/US9162256B2/en not_active Expired - Fee Related
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