EP1951446A1 - Safety device for sieving granular material - Google Patents

Safety device for sieving granular material

Info

Publication number
EP1951446A1
EP1951446A1 EP06828951A EP06828951A EP1951446A1 EP 1951446 A1 EP1951446 A1 EP 1951446A1 EP 06828951 A EP06828951 A EP 06828951A EP 06828951 A EP06828951 A EP 06828951A EP 1951446 A1 EP1951446 A1 EP 1951446A1
Authority
EP
European Patent Office
Prior art keywords
separator
fines
cyclone
sifter
classifier
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
EP06828951A
Other languages
German (de)
French (fr)
Other versions
EP1951446B1 (en
Inventor
Siegfried Strasser
Albert Süssegger
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.)
KHD Humboldt Wedag AG
Original Assignee
KHD Humboldt Wedag AG
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Filing date
Publication date
Application filed by KHD Humboldt Wedag AG filed Critical KHD Humboldt Wedag AG
Publication of EP1951446A1 publication Critical patent/EP1951446A1/en
Application granted granted Critical
Publication of EP1951446B1 publication Critical patent/EP1951446B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • 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
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B04C2009/007—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with internal rotors, e.g. impeller, ventilator, fan, blower, pump

Definitions

  • the invention relates to a sifting device for sifting granular material, with at least one arranged in the sifter housing rod basket with distributed over the rotor circumference turbo elements arranged and with inlets and outlets for sight gas, reformgut, coarse material and fines, wherein at least one of the end faces of the rotatable rod basket in the classifier housing, the outlet opening is arranged for the withdrawal of the view gas laden with the fine material.
  • the fine material is counteracted by the air flow Centrifugal force between see the rods of the bar basket conveyed inwards and leaves together with the classifying air the classifier, while the coarse material passes through the centrifugal force to the outer edge of the classifier housing and is discharged by gravity down from the viewing zone.
  • BESTATlGUNGSKOPiE In the known dynamic rod sifter the loaded with the fines view air stream after leaving the classifier over a more or less long pipe to a separator such. B. cyclone directed to the separation of the fine material from the classifying air, what appropriate space is needed.
  • the connecting pipe between Stabkorbsichter and downstream fine material causes a noticeable pressure loss. All this applies in principle even if the connecting pipe between the rod basket sifter and a downstream cyclone separator is relatively short, as in the known sifter of DE-A 102 21 739 the case.
  • the invention has for its object to further develop a sifter for sifting granular material with at least one rotatable rod basket and a downstream fine material so that space and specific energy requirements for the operation of the overall device can be saved.
  • a dip tube is arranged for the withdrawal of the freed from the fine sight gas stream, while at the periphery of the Wirbelabscheidergeophuses at least one opening for discharging the separated from the classifying air flow fine material is arranged.
  • the fine-material discharge opening may be arranged approximately at the point at which the inlet for the classifying air carrying the visible goods is located in a conventional cyclone separator.
  • the axis of rotation of the rod basket as well as approximately aligned with the central axis of the cyclonic vortex separator substantially horizontally be arranged horizontally.
  • the said axes can also be arranged vertically. If the fines discharge opening is arranged in the lowest area of the vortex separator housing, the fines can advantageously be discharged by gravity.
  • the immersion tube which is arranged in the vortex separator, can have through-openings distributed around the immersion tube circumference in its end region facing the rotatable rod cage for the low-loss extraction of the classifying air.
  • This dip tube end region like the vortex separator housing, can be conically tapered in the direction of the rotatable rod cage.
  • the drawing shows in vertical section a rod basket sifter with directly attached cyclone vortex separator.
  • At least one rod cage 1 1 is rotatable with turbo elements 12 arranged distributed over the rotor circumference stored, and flying on an approximately horizontally lying shaft 13 which is driven by a motor 14.
  • the rod cage 11 with its turbo elements 12 can also be conical or frustoconical in shape instead of cylindrical.
  • a frusto-conical displacement body 15 may be arranged in the interior of the rod basket 1 1, a frusto-conical displacement body 15 may be arranged. The grainy good to be seen, the z. B. is coming from an airflow mill is suspended in a classifying air stream 16 is introduced into the classifier housing 10, where it is accelerated to the peripheral speed of the rotating rod basket 1 1.
  • the fine material contained in the feed material is conveyed inward against the centrifugal force between the rods 12 of the bar basket 1 1 and leaves together with the classifying air centrally the bar basket in the embodiment to the right side, while the coarse material 17 by the centrifugal force to the outer edge of the The sifter housing 10 is forced off and is discharged there from the classifying zone by gravitational action downwards through the discharge opening 18 from the classifier housing 10.
  • the outlet opening 19 for discharging the view gas laden with the fine material 20 is arranged in the case 10, which flows out with considerable swirl energy.
  • a cyclone-like Wirbelabscheider 21 with the smaller diameter of its housing cone 22 is grown directly from the appearance, so that the rod basket sifter 10, 1 1 and the separator 21 form a compact unit.
  • a dip tube 23 is arranged for the withdrawal of the freed from fines prepare for fines.
  • exhaust air 24 can be at least recirculated to the fan housing 23 of the vortex separator 21 in connection fan as circulating air in the classifier housing 10.
  • dip tube 23 in its the rotatable rod basket 1 1 facing end portion distributed around the dip tube circumference window-like z. B. slot-shaped passage openings 27 for the passage of the classifying air 24 have.
  • the cylindrical dip tube 23 may be conically tapered in its end towards the rotatable rod basket 1 1, wherein the dip tube 23 may be closed at its end by a closure 28, so that the swirl flow 20 of the Visual air is forced to flow through the window-like openings 27 into the dip tube 23.
  • a static cascade classifier can be connected upstream of the sifter cage 1 1 in the area of the cascade sensor, and then in the area of the rod cage sifter portion 11 the discharge 18 for the middle goods 17 and the Wirbelabscheidergeophuse 21 are associated with the discharge of the fines 26.
  • Such a static cascade classifier has two submitzonenbegrenzungscolour enclosed by the classifier housing and forming between them a visual zone and by the classifying air or hot gas as drying gas about in cross-flow through which obliquely downward th inclined cascade or louver-like arranged baffles, said two baffle walls and the intermediate viewing zone are arranged obliquely with a deviating from the vertical angle.
  • Such a static cascade sifter is well suited to Gutagglomerate contained in reformgut such.
  • B. slips a Gutbettzerklein ceremoniess roller press or high-pressure roller mill to dissolve or disagglomerate.
  • the classifier housing 10 may be arranged around the rotating rod basket 1 1 around a non-rotating, but fixed vane ring.
  • a plurality of cyclone-like vortex separators 21 of the same design can be distributed around the circumference of the classifier housing opening 19, through which the sighting gas flow 20 charged with fines and swirls emerges, the tangential component of the classifying gas flow 20 in the connection between the classifier housing 10 and the inlet the plurality of vortex separators 21 is maintained.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Crushing And Grinding (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Road Signs Or Road Markings (AREA)
  • Toys (AREA)

Abstract

In order to improve the design of a sieve device for sieving granular material with at least one rotational cage-rotor classifier and with a fines separator connected downstream therefrom, whereby saving space and specific energy demand for operating the entire device. To this end, the invention provides that a cyclone-like cyclone separator (21) is to be directly mounted with the smaller diameter of its housing cone (22) on the sieve housing opening (19) for drawing the flow of sieving gas (20), which flows out with angular momentum energy and which is loaded with the fines, whereby the cage-rotor classifier (10, 11) and the separator (21) form a compact modular unit, and an immersion tube (23) for drawing the flow of sieving gas (24), which is rid of the fines, is to be placed in the center of the cyclone separator (21), and at least one opening (25) for discharging the fines (26) is to be placed on the periphery of the cyclone separator housing (21).

Description

Sichtereinrichtung zum Sichten von körnigem Gut Classifying device for sifting granular material
B E S C H R E I B U N GDESCRIPTION
Die Erfindung betrifft eine Sichtereinrichtung zum Sichten von körnigem Gut, mit wenigstens einem im Sichtergehäuse rotierbar angeordneten Stabkorb mit über den Rotorumfang verteilt angeordneten Turboelementen und mit Ein- und Auslässen für Sichtgas, Sichtgut, Grobgut und Feingut, wobei an wenigstens einer der Stirnseiten des rotierbaren Stabkorbs im Sichtergehäuse die Auslassöffnung zum Abzug des mit dem Feingut beladenen Sichtgasstromes angeordnet ist.The invention relates to a sifting device for sifting granular material, with at least one arranged in the sifter housing rod basket with distributed over the rotor circumference turbo elements arranged and with inlets and outlets for sight gas, Sichtgut, coarse material and fines, wherein at least one of the end faces of the rotatable rod basket in the classifier housing, the outlet opening is arranged for the withdrawal of the view gas laden with the fine material.
Bekannt sind derartige dynamische Sichter, auch Stabkorbsichter genannt, bei denen das Sichtgut in der Sichtzone durch den rotierenden Stabkorb auf die Umfangsgeschwindigkeit des Stabkorbes beschleunigt wird und durch das Zusammenwirken der auf die Sichtgutteilchen wirkenden Fliehkraft (Zentrifugalkraft) und der Reibungskraft der Luft- Strömung eine Auftrennung des Sichtgutes in ein Grobgut und in ein Feingut herbeigeführt wird, z. B. Publikation "KHD Symposium '92" Band 1 , 1993, der KHD Humboldt Wedag AG, Aufsatz von A. Süßeg- ger Sichter-Report "92 Seite 63ff, insbesondere Seite 65 Bild 1. Dabei wird das Feingut durch die Luftströmung entgegen der Fliehkraft zwi- sehen die Stäbe des Stabkorbes nach innen gefördert und verlässt gemeinsam mit der Sichtluft den Sichter, während das Grobgut durch die Fliehkraft zum äußeren Rand des Sichtergehäuses gelangt und dort durch Schwerkraft nach unten aus der Sichtzone ausgetragen wird.Are known such dynamic classifier, also called Stabkorbsichter, in which the Sichtgut is accelerated in the viewing zone by the rotating rod basket on the peripheral speed of the Stabkorbes and by the interaction of acting on the Sichtgutteilchen centrifugal force (centrifugal force) and the friction force of the air flow separation the visual material is brought into a coarse material and a fines, z. B. Publication "KHD Symposium '92" Volume 1, 1993, KHD Humboldt Wedag AG, Article by A. Süßegger Sichter-Report "92 Page 63ff, especially page 65 Fig. 1. The fine material is counteracted by the air flow Centrifugal force between see the rods of the bar basket conveyed inwards and leaves together with the classifying air the classifier, while the coarse material passes through the centrifugal force to the outer edge of the classifier housing and is discharged by gravity down from the viewing zone.
BESTATlGUNGSKOPiE Bei den bekannten dynamischen Stabkorbsichtern wird der mit dem Feingut beladene Sichtluftstrom nach Verlassen des Sichters über eine mehr oder weniger lange Rohrleitung zu einem Abscheider wie z. B. Zyklon zur Abtrennung des Feinguts von der Sichtluft geleitet, wozu entsprechender Platz benötigt wird. Hinzu kommt, dass die Verbindungsrohrleitung zwischen Stabkorbsichter und nachgeschaltetem Feingutabscheider einen spürbaren Druckverlust verursacht. Dies alles gilt prinzipiell auch dann, wenn die Verbindungsrohrleitung zwischen dem Stabkorbsichter und einem nachgeschalteten Zyklonab- scheider verhältnismäßig kurz ist, wie bei der bekannten Sichtereinrichtung der DE-A 102 21 739 der Fall.BESTATlGUNGSKOPiE In the known dynamic rod sifter the loaded with the fines view air stream after leaving the classifier over a more or less long pipe to a separator such. B. cyclone directed to the separation of the fine material from the classifying air, what appropriate space is needed. In addition, the connecting pipe between Stabkorbsichter and downstream fine material causes a noticeable pressure loss. All this applies in principle even if the connecting pipe between the rod basket sifter and a downstream cyclone separator is relatively short, as in the known sifter of DE-A 102 21 739 the case.
Der Erfindung liegt die Aufgabe zugrunde, eine Sichtereinrichtung zum Sichten von körnigem Gut mit wenigstens einem rotierbaren Stabkorb und einem nachgeschalteten Feingutabscheider so weiter zu entwickeln, dass Platz und spezifischer Energiebedarf zum Betrieb der Gesamteinrichtung eingespart werden.The invention has for its object to further develop a sifter for sifting granular material with at least one rotatable rod basket and a downstream fine material so that space and specific energy requirements for the operation of the overall device can be saved.
Diese Aufgabe wird gemäß der Erfindung mit einer Sichtereinrichtung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved according to the invention with a classifying device with the features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.
Durch das Merkmal der Erfindung, bei der Sichtereinrichtung mit rotierbarem Stabkorb an der Sichtergehäuseöffnung zum Abzug des mit Drallenergie ausströmenden mit dem Feingut beladenen Sichtgasstromes unmittelbar einen vom Aussehen zyklonartigen Wirbelabscheider mit dem kleineren Durchmesser seines Gehäusekonusses anzubauen und aus dem Stabkorbsichter und dem nachgeschalteten Feingutabscheider eine kompakte Baueinheit zu bilden, ohne die üb- lieh gewesenen Verbindungsrohrleitungen einzusetzen, werden Material- und Raumbedarf der Gesamteinrichtung eingespart. Ferner ergibt sich daraus eine deutliche Reduzierung des spezifischen Ener- giebedarfs für die Gesamteinrichtung, und zwar in erster Linie durch den Wegfall des durch die Rohrleitungen sonst verursachten Strömungswiderstandes bzw. Druckverlustes für die Sichtluft, der sonst durch ein Mehr an elektrischer Antriebsleistung für das nachgeschal- tete Saugzuggebläse bzw. für den Ventilator kompensiert werden muss. Hinzu kommt ein Wegfall der Beschleunigungsverluste für die Sichtluft und das Feingut, die ein einem Stabkorbsichter nachgeschalteter Abscheidezyklon herkömmlicher Bauweise zwangsweise im Einlauf verursacht. Die Einsparung an spezifischem Energiebedarf resultiert besonders dadurch, dass bei der erfindungsgemäßen Sichtereinrichtung die Drallenergie des aus dem Stabkorb ausströmenden mit dem Feingut beladenen Sichtgasstromes für den Feingut- Abscheidevorgang im unmittelbar angebauten zyklonartigen Wirbelabscheider genutzt wird, so dass der zyklonartige Wirbelabscheider einen tangentialen Strömungseinlauf nicht benötigt.By the feature of the invention, in the sifter with rotatable rod basket at the Sichtergehäuseöffnung to extract the swirling energy flowing with the fines laden sight gas stream directly grow a cyclone-type cyclone vortex separator with the smaller diameter of its housing cone and from the rod basket sifter and the downstream fine material a compact unit To form, without using the lent leased connecting pipelines, material and space requirements of the entire device can be saved. Furthermore, this results in a significant reduction of the specific energy giebedarfs for the entire facility, and in the first place by the elimination of the otherwise caused by the pipes flow resistance or pressure loss for the classifying air, which must otherwise be compensated by an increase in electrical drive power for the downstream induced draft fan or for the fan. In addition, there is a loss of acceleration losses for the classifying air and the fine material, which caused a Stabkorbsichter downstream separation cyclone conventional design forcibly in the inlet. The saving in specific energy requirement results in particular from the fact that the swirl energy of the visible from the rod basket laden with the fines view gas flow is used for the fines deposition in directly attached cyclone vortex separator, so that the cyclone vortex trap does not require a tangential flow inlet.
Vielmehr tritt die Strömung in den angebauten zyklonartigen Wirbelabscheider der erfindungsgemäßen Einrichtung an der Stelle ein, an der sich bei einem konventionellen Zyklonabscheider die Konusspitze mit dem Grobgutaustrag befindet. Im Zentrum des zyklonartigen Wirbelabscheiders ist ein Tauchrohr zum Abzug des vom Feingut befreiten Sichtgasstromes angeordnet, während an der Peripherie des Wirbelabscheidergehäuses wenigstens eine Öffnung zum Austrag des vom Sichtluftstrom abgetrennten Feinguts angeordnet ist. So kann beim zyklonartigen Wirbelabscheider die Feingutaustragsöffnung etwa an der Stelle angeordnet sein, an dem sich bei einem konventionellen Zyklonabscheider der Einlass für die das Sichtgut tragende Sichtluft befindet.Rather, the flow enters the attached cyclone vortex separator of the device according to the invention at the point at which the Konusspitze with the coarse material discharge is in a conventional cyclone. In the center of the cyclonic vortex separator, a dip tube is arranged for the withdrawal of the freed from the fine sight gas stream, while at the periphery of the Wirbelabscheidergehäuses at least one opening for discharging the separated from the classifying air flow fine material is arranged. Thus, in the cyclone-type vortex separator, the fine-material discharge opening may be arranged approximately at the point at which the inlet for the classifying air carrying the visible goods is located in a conventional cyclone separator.
Nach einem weiteren Merkmal der Erfindung können die Drehachse des Stabkorbs sowie dazu etwa fluchtend angeordnet die Zentralachse des zyklonartigen Wirbelabscheiders im wesentlichen horizontal liegend angeordnet sein. Die genannten Achsen können aber auch vertikal angeordnet sein. Wenn die Feingut-Austragsöffnung im untersten Bereich des Wirbelabscheidergehäuses angeordnet wird, kann das Feingut mit Vorteil einfach per Schwerkraft ausgetragen werden.According to a further feature of the invention, the axis of rotation of the rod basket as well as approximately aligned with the central axis of the cyclonic vortex separator substantially horizontally be arranged horizontally. The said axes can also be arranged vertically. If the fines discharge opening is arranged in the lowest area of the vortex separator housing, the fines can advantageously be discharged by gravity.
Nach einem weiteren Merkmal der Erfindung besteht aber auch die Möglichkeit, dass das an der Peripherie des Wirbelabscheidergehäuses gesammelte Feingut suspendiert in einem Sichtgasteilstrom von einem eigenen Ventilator abgezogen wird, wobei das Tauchrohr des Wirbelabscheiders zum Abzug des restlichen Sichtgasteilstromes zu einem anderen eigenen Ventilator und Staubfilter geführt ist. Die Abluft wenigstens des mit dem Tauchrohr des Wirbelabscheiders in Verbindung stehenden Ventilators kann als Umluft in das Sichterge- häuse rezirkuliert werden.According to a further feature of the invention, however, there is also the possibility that the collected at the periphery of the Wirbelabscheidergehäuses fine suspended in a Sichtgasteilstrom is deducted from its own fan, wherein the dip tube of Wirbelabscheiders led to subtract the remaining Sichtgasteilstromes to another own fan and dust filter is. The exhaust air of at least the fan connected to the immersion tube of the vortex separator can be recirculated as circulating air into the classifier housing.
Das im Wirbelabscheider angeordnete Tauchrohr kann in seinem dem rotierbaren Stabkorb zugewandten Endbereich um den Tauchrohrum- fang verteilte Durchgangsöffnungen zum Strömungsverlustarmen Ab- zug der Sichtluft aufweisen. Dieser Tauchrohrendbereich kann, genauso wie das Wirbelabscheidergehäuse, in Richtung zum rotierbaren Stabkorb hin konisch verjüngt sein.The immersion tube, which is arranged in the vortex separator, can have through-openings distributed around the immersion tube circumference in its end region facing the rotatable rod cage for the low-loss extraction of the classifying air. This dip tube end region, like the vortex separator housing, can be conically tapered in the direction of the rotatable rod cage.
Die Erfindung und deren weitere Merkmale und Vorteile werden an- hand des in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert.The invention and its further features and advantages will be explained in more detail with reference to the embodiment schematically illustrated in the drawing.
Die Zeichnung zeigt im Vertikalschnitt einen Stabkorbsichter mit unmittelbar angebautem zyklonartigen Wirbelabscheider.The drawing shows in vertical section a rod basket sifter with directly attached cyclone vortex separator.
In einem Sichtergehäuse 10 ist wenigstens ein Stabkorb 1 1 mit über den Rotorumfang verteilt angeordneten Turboelementen 12 drehbar gelagert, und zwar fliegend an einer etwa horizontal liegenden Welle 13, die von einem Motor 14 antreibbar ist. Der Stabkorb 11 mit seinen Turboelementen 12 kann statt zylindrisch auch konisch bzw. kegel- mantelstumpfförmig ausgebildet sein. Im inneren des Stabkorbs 1 1 kann ein kegelstumpfförmiger Verdrängungskörper 15 angeordnet sein. Das zu sichtende körnige Gut, das z. B. von einer Luftstrommühle kommt, wird suspendiert in einem Sichtluftstrom 16 in das Sichtergehäuse 10 eingeführt, wo es auf die Umfangsgeschwindigkeit des rotierenden Stabkorbs 1 1 beschleunigt wird. Das im Aufgabegut enthaltene Feingut wird durch die Luftströmung entgegen der Fliehkraft zwischen die Stäbe 12 des Stabkorbs 1 1 nach innen gefördert und verlässt gemeinsam mit der Sichtluft zentral den Stabkorb im Ausführungsbeispiel zur rechten Seite hin, während das Grobgut 17 durch die Fliehkraft zum äußeren Rand des Sichtergehäuses 10 ab- gedrängt wird und dort aus der Sichtzone durch Schwerkrafteinwirkung nach unten durch Austragsöffnung 18 aus dem Sichtergehäuse 10 ausgetragen wird.In a classifier housing 10, at least one rod cage 1 1 is rotatable with turbo elements 12 arranged distributed over the rotor circumference stored, and flying on an approximately horizontally lying shaft 13 which is driven by a motor 14. The rod cage 11 with its turbo elements 12 can also be conical or frustoconical in shape instead of cylindrical. In the interior of the rod basket 1 1, a frusto-conical displacement body 15 may be arranged. The grainy good to be seen, the z. B. is coming from an airflow mill is suspended in a classifying air stream 16 is introduced into the classifier housing 10, where it is accelerated to the peripheral speed of the rotating rod basket 1 1. The fine material contained in the feed material is conveyed inward against the centrifugal force between the rods 12 of the bar basket 1 1 and leaves together with the classifying air centrally the bar basket in the embodiment to the right side, while the coarse material 17 by the centrifugal force to the outer edge of the The sifter housing 10 is forced off and is discharged there from the classifying zone by gravitational action downwards through the discharge opening 18 from the classifier housing 10.
An der rechten Stirnseite des rotierenden Stabkorbs 1 1 ist im Sich- tergehäuse 10 die Auslassöffnung 19 zum Abzug des mit dem Feingut beladenen Sichtgasstromes 20 angeordnet, der mit erheblicher Drallenergie ausströmt. An dieser Sichtergehäuseöffnung 19 ist unmittelbar ein vom Aussehen zyklonartiger Wirbelabscheider 21 mit dem kleineren Durchmesser seines Gehäusekonusses 22 angebaut, so dass der Stabkorbsichter 10, 1 1 und der Abscheider 21 eine kompakte Baueinheit bilden. Im Zentrum des zyklonartigen Wirbelabscheiders 21 ist ein Tauchrohr 23 zum Abzug des vom Feingut befreiten Sichtluftstroms 24 angeordnet, der von einem nicht dargestellten Saugzuggebläse bzw. Ventilator angesaugt wird. An der Peripherie des Wirbelabscheidergehäuses 21 , im Ausführungsbeispiel in dessen unterstem Bereich ist eine Öffnung 25 zum Austrag des Feinguts 26 per Schwerkrafteinwirkung angeordnet. Es besteht aber auch die Möglichkeit, dass das an der Peripherie des Wirbelabscheidergehäuses 21 gesammelte Feingut suspendiert in einem Sichtgasteilstrom von einem eigenen nicht dargestellten Ventilator abgezogen wird, der ein anderer Ventilator ist als derjenige, der den Sichtluftstrom 24 ab- zieht.At the right end side of the rotating bar cage 1 1, the outlet opening 19 for discharging the view gas laden with the fine material 20 is arranged in the case 10, which flows out with considerable swirl energy. At this Sichtergehäuseöffnung 19 a cyclone-like Wirbelabscheider 21 with the smaller diameter of its housing cone 22 is grown directly from the appearance, so that the rod basket sifter 10, 1 1 and the separator 21 form a compact unit. In the center of the cyclone-like vortex separator 21, a dip tube 23 is arranged for the withdrawal of the freed from fines Sichtluftstroms 24, which is sucked in by an induced draft fan or fan, not shown. At the periphery of the Wirbelabscheidergehäuses 21, in the embodiment in the lowermost region of an opening 25 for discharging the fine material 26 by gravity is arranged. But there is also the Possibility that the fines collected at the periphery of the vortex separator housing 21 are suspended in a partial stream of visible gas withdrawn from its own unillustrated fan, which is a different fan than the one which draws the classifying air stream 24.
Es versteht sich, dass die Abluft 24 wenigstens des mit dem Tauchrohr 23 des Wirbelabscheiders 21 in Verbindung stehenden Ventilators als Umluft in das Sichtergehäuse 10 rezirkuliert werden kann.It is understood that the exhaust air 24 can be at least recirculated to the fan housing 23 of the vortex separator 21 in connection fan as circulating air in the classifier housing 10.
Wie aus der Zeichnung noch hervorgeht, kann das im Wirbelabscheider 21 angeordnet Tauchrohr 23 in seinem dem rotierbaren Stabkorb 1 1 zugewandten Endbereich um den Tauchrohrumfang verteilte fensterartige z. B. schlitzförmige Durchgangsöffnungen 27 zum Durchtritt der Sichtluft 24 aufweisen. Ferner geht aus der Zeichnung noch hervor, dass das zylindrische Tauchrohr 23 in seinem Endbereich in Richtung zum rotierbaren Stabkorb 1 1 hin konisch verjüngt sein kann, wobei das Tauchrohr 23 an seinem Ende durch einen Verschluss 28 verschlossen sein kann, so dass die Drallströmung 20 der Sichtluft gezwungen ist, durch die fensterartigen Öffnungen 27 hindurch in das Tauchrohr 23 einzuströmen.As can be seen from the drawing, arranged in the vortex separator 21 dip tube 23 in its the rotatable rod basket 1 1 facing end portion distributed around the dip tube circumference window-like z. B. slot-shaped passage openings 27 for the passage of the classifying air 24 have. Furthermore, it is apparent from the drawing that the cylindrical dip tube 23 may be conically tapered in its end towards the rotatable rod basket 1 1, wherein the dip tube 23 may be closed at its end by a closure 28, so that the swirl flow 20 of the Visual air is forced to flow through the window-like openings 27 into the dip tube 23.
Im Sichtergehäuse 10 kann dem wenigstens einen Stabkorb 1 1 sicht- luftströmungsseitig ein statischer Kaskadensichter vorgeschaltet sein, so dass dann dem Sichtergehäuse 10 im Bereich des Kaskadensich- ters ein Austrag für Grobgut und im Bereich des Stabkorbsichterteils 11 der Austrag 18 dann für das Mittelgut 17 und dem Wirbelabscheidergehäuse 21 der Austrag für das Feingut 26 zugeordnet sind. Ein solcher statischer Kaskadensichter weist zwei vom Sichtergehäuse umschlossene und zwischen sich eine Sichtzone bildende sowie von der Sichtluft bzw. von Heißgas als Trocknungsgas etwa im Querstrom durchströmte Sichtzonenbegrenzungswände auf, die schräg nach un- ten geneigte kaskadenartig bzw. jalousieartig angeordnete Leitbleche aufweisen, wobei diese beiden Leitblechwände und die dazwischen liegende Sichtzone mit einem von der Vertikalen abweichenden Winkel schräg liegend angeordnet sind. Ein solcher statischer Kaskaden- sichter ist gut geeignet, im Sichtgut enthaltene Gutagglomerate wie z. B. Pressschülpen einer Gutbettzerkleinerungs-Rollenpresse bzw. Hochdruck-Walzenmühle aufzulösen bzw. zu desagglomerieren.In the classifier housing 10, a static cascade classifier can be connected upstream of the sifter cage 1 1 in the area of the cascade sensor, and then in the area of the rod cage sifter portion 11 the discharge 18 for the middle goods 17 and the Wirbelabscheidergehäuse 21 are associated with the discharge of the fines 26. Such a static cascade classifier has two Sichtzonenbegrenzungswände enclosed by the classifier housing and forming between them a visual zone and by the classifying air or hot gas as drying gas about in cross-flow through which obliquely downward th inclined cascade or louver-like arranged baffles, said two baffle walls and the intermediate viewing zone are arranged obliquely with a deviating from the vertical angle. Such a static cascade sifter is well suited to Gutagglomerate contained in Sichtgut such. B. slips a Gutbettzerkleinerungs roller press or high-pressure roller mill to dissolve or disagglomerate.
Im Sichtergehäuse 10 kann um den rotierenden Stabkorb 1 1 herum ein nicht rotierender, sondern feststehender Leitschaufelkranz angeordnet sein.In the classifier housing 10 may be arranged around the rotating rod basket 1 1 around a non-rotating, but fixed vane ring.
Erfindungsgemäß können auch mehrere zyklonartige Wirbelabscheider 21 gleicher Bauart um den Umfang der Sichtergehäuseöffnung 19 verteilt angeordnet sein, durch welche die mit Feingut und Drall bela- dene Sichtgasströmung 20 austritt, wobei die Tangentialkomponente der Sichtgasströmung 20 in der Verbindung zwischen dem Sichtergehäuse 10 und dem Eintritt in die mehreren Wirbelabscheider 21 erhalten bleibt. According to the invention, a plurality of cyclone-like vortex separators 21 of the same design can be distributed around the circumference of the classifier housing opening 19, through which the sighting gas flow 20 charged with fines and swirls emerges, the tangential component of the classifying gas flow 20 in the connection between the classifier housing 10 and the inlet the plurality of vortex separators 21 is maintained.

Claims

A N S P R Ü C H E
1. Sichtereinrichtung zum Sichten von körnigem Gut, mit wenigstens einem im Sichtergehäuse (10) rotierbar angeordneten Stabkorb1. separator device for sifting granular material, with at least one in the classifier housing (10) rotatably arranged rod basket
(1 1 ) mit über den Rotorumfang verteilt angeordneten Turboelementen(1 1) distributed over the rotor circumference arranged turbo elements
(12) und mit Ein- und Auslässen für Sichtgas (16), Sichtgut, Grobgut (17) und Feingut, wobei an wenigstens einer der Stirnseiten des rotierbaren Stabkorbs (1 1 ) im Sichtergehäuse (10) die Auslassöffnung (19) zum Abzug des mit dem Feingut beladenen Sichtgasstromes (20) angeordnet ist, gekennzeichnet durch folgende Merkmale:(12) and with inlets and outlets for sighting gas (16), Sichtgut, coarse material (17) and fines, wherein at least one of the end faces of the rotatable rod basket (1 1) in the classifier housing (10) the outlet opening (19) for the withdrawal of is arranged with the fine material loaded Sichtgasstromes (20), characterized by the following features:
a) an der Sichtergehäuseöffnung (19) zum Abzug des mit Drallenergie ausströmenden mit dem Feingut beladenen Sichtgasstromes (20) ist unmittelbar ein zyklonartiger Wirbelabscheider (21 ) mit dem kleineren Durchmesser seines Gehäuseko- nusses (22) angebaut, so dass der Stabkorbsichter (10, 1 1 ) und der Abscheider (21 ) eine kompakte Baueinheit bilden,a) a cyclone-type vortex separator (21) with the smaller diameter of its Gehäuseko- nut (22) is attached directly to the Sichtergehäuseöffnung (19) for the withdrawal of the swirling energy flowing with the fine material laden Sichtengstrom (20), so that the Stabkorbsichter (10, 1 1) and the separator (21) form a compact unit,
b) im Zentrum des zyklonartigen Wirbelabscheiders (21 ) ist ein Tauchrohr (23) zum Abzug des vom Feingut befreiten Sicht- gasstroms (24) angeordnet,b) in the center of the cyclone-type vortex separator (21) a dip tube (23) is arranged for the withdrawal of the freed of fine material Sichtgasstroms (24),
c) an der Peripherie des Wirbelabscheidergehäuses (21 ) ist wenigstens eine Öffnung (25) zum Austrag des Feinguts (26) angeordnet. c) at the periphery of the Wirbelabscheidergehäuses (21) at least one opening (25) for discharging the fine material (26) is arranged.
2. Sichtereinrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Drehachse (13) des Stabkorbs (1 1 ) sowie dazu etwa fluchtend angeordnet die Achse des zyklonartigen Wirbelabscheiders (21 ) im wesentlichen horizontal liegend ange- ordnet sind.2. sifter device according to claim 1, characterized in that the axis of rotation (13) of the rod basket (1 1) and arranged approximately in alignment with the axis of the cyclone-like vortex separator (21) are arranged substantially horizontal lying.
3. Sichtereinrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Feingut-Austragsöffnung (25) im untersten Bereich des Wirbelabscheidergehäuses (21 ) angeordnet ist und das Feingut (26) per Schwerkrafteinwirkung ausgetragen wird.3. sifter according to claim 1, characterized in that the fines discharge opening (25) in the lowermost region of the Wirbelabscheidergehäuses (21) is arranged and the fines (26) is discharged by gravity.
4. Sichtereinrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das an der Peripherie des Wirbelabscheidergehäuses (21) gesammelte Feingut (26) suspendiert in ei- nem Sichtgasteilstrom von einem eigenen Ventilator abgezogen wird, und dass das Tauchrohr (23) des Wirbelabscheiders (21 ) zum Abzug des restlichen Sichtgasteilstromes zu einem eigenen Ventilator und Staubfilter geführt ist.4. sifter device according to claim 1, characterized in that at the periphery of the Wirbelabscheidergehäuses (21) collected fines (26) is suspended withdrawn in a segregation gas partial stream of its own fan, and that the dip tube (23) of the vortex separator (21) to deduct the remaining partial gas stream to a separate fan and dust filter is performed.
5. Sichtereinrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Abluft (24) wenigstens des mit dem Tauchrohr (23) des Wirbelabscheiders (21) in Verbindung stehenden Ventilators als Umluft in das Sichtergehäuse (10) rezirkulier- bar ist.5. sifter according to claim 4, characterized in that the exhaust air (24) at least of the immersion tube (23) of the vortex separator (21) in connection with the associated fan recirculation in the classifier housing (10) is recirculated bar.
6. Sichtereinrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das im Wirbelabscheider (21 ) angeordnete Tauchrohr (23) in seinem dem rotierbaren Stabkorb (11 ) zugewandten Endbereich um den Tauchrohrumfang verteilte Durch- gangsöffnungen (27) aufweist. 6. separator device according to claim 1, characterized in that in the vortex separator (21) arranged immersion tube (23) in its the rotatable rod basket (11) facing end portion distributed around the immersion tube circumference through openings (27).
7. Sichtereinrichtung nach den Ansprüchen 1 oder 6, dadurch gekennzeichnet, dass das im Wirbelabscheider (21 ) angeordnete zylindrische Tauchrohr (23) in Richtung zum rotierbaren Stabkorb (1 1 ) hin konisch verjüngt ist.7. separator device according to claims 1 or 6, characterized in that in the vortex separator (21) arranged cylindrical dip tube (23) is tapered in the direction of the rotatable rod basket (1 1) towards conical.
8. Sichtereinrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass im Sichtergehäuse (10) dem wenigstens einen Stabkorb (1 1 ) sichtluftströmungsseitig ein statischer Kaskadensichter vorgeschaltet ist, so dass dann dem Sichtergehäuse (10) im Bereich des Kaskadensichters der Austrag für Grobgut und im Bereich des Stabkorbsichterteils (1 1 ) dann der Austrag für Mittelgut (17) und dem Wirbelabscheidergehäuse (21 ) der Austrag für das Feingut (26) zugeordnet sind. 8. sifter according to one of claims 1 to 7, characterized in that in the classifier housing (10) the at least one bar cage (1 1) sichtluftströmungsseitig a static cascade classifier is connected upstream, so that then the classifier housing (10) in the region of the cascade classifier of the discharge for Grobgut and in the field of Stabkorbsichterteils (1 1) then the discharge for medium (17) and the Wirbelabscheidergehäuse (21) are associated with the discharge of the fine material (26).
EP06828951A 2005-11-10 2006-11-08 Safety device for sieving granular material Not-in-force EP1951446B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005053617A DE102005053617A1 (en) 2005-11-10 2005-11-10 Classifying device for sifting granular material
PCT/EP2006/010670 WO2007054270A1 (en) 2005-11-10 2006-11-08 Safety device for sieving granular material

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EP1951446A1 true EP1951446A1 (en) 2008-08-06
EP1951446B1 EP1951446B1 (en) 2011-01-05

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US (1) US8083070B2 (en)
EP (1) EP1951446B1 (en)
CN (1) CN101291747A (en)
AT (1) ATE494079T1 (en)
DE (2) DE102005053617A1 (en)
DK (1) DK1951446T3 (en)
EA (1) EA200800425A1 (en)
TW (1) TW200734071A (en)
WO (1) WO2007054270A1 (en)

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CN101291747A (en) 2008-10-22
US20080290002A1 (en) 2008-11-27
EP1951446B1 (en) 2011-01-05
WO2007054270A1 (en) 2007-05-18
TW200734071A (en) 2007-09-16
EA200800425A1 (en) 2008-10-30
US8083070B2 (en) 2011-12-27
DE102005053617A1 (en) 2007-06-14
ATE494079T1 (en) 2011-01-15
DE502006008680D1 (en) 2011-02-17
DK1951446T3 (en) 2011-05-02

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