EP1786573B1 - Apparatus for classifying charge material - Google Patents

Apparatus for classifying charge material Download PDF

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Publication number
EP1786573B1
EP1786573B1 EP06791672A EP06791672A EP1786573B1 EP 1786573 B1 EP1786573 B1 EP 1786573B1 EP 06791672 A EP06791672 A EP 06791672A EP 06791672 A EP06791672 A EP 06791672A EP 1786573 B1 EP1786573 B1 EP 1786573B1
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Prior art keywords
sifter
width
static
aerating
dynamic
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German (de)
French (fr)
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EP1786573A1 (en
Inventor
Ludwig KÖNNING
Egbert Burchardt
Olaf Hagemeier
Franz-Josef Zurhove
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ThyssenKrupp Industrial Solutions AG
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Polysius AG
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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
    • 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
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Soil Working Implements (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Disintegrating Or Milling (AREA)
  • Glass Compositions (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

The device has a static separator (1) with an inclined aeration base (1a) through which separator gas (2) flows, where the aeration base is arranged in a vertical direction. An inlet opening (3) feeds raw material (9) to the aeration base, and an outlet opening (4) is provided for coarse particles. A downstream dynamic separator (5) has a rotor (5a) and another outlet opening for the separator gas loaded with fine particles. A ratio of breadth to height of the aeration base is 0.6.

Description

Die Erfindung betrifft einen statisch-dynamischen Sichter zum Sichten von Aufgabegut mit einem statischen Sichter, der einen schräg zur Vertikalen ausgerichteten, von Sichtgas durchströmten Belüftungsboden aufweist sowie einem nachgeschalteten dynamischen Sichter.The invention relates to a static-dynamic sifter for sifting feedstock with a static sifter having an inclined to the vertical aligned, traversed by classifying gas ventilation floor and a downstream dynamic classifier.

Aus der DE 42 23 762 ist ein Sichter zum Sichten von körnigem Gut bekannt, der einen Stabkorbsichter sowie einen vorgeschalteten, schachtförmigen Kaskadensichter aufweist. Dieser Kaskadensichter weist zwei zur Vertikalen geneigte, gegenüberliegende und zwischen sich eine Vorsichtungszone bildende Schachtbegrenzungswände auf, die für die Sichtluft durchlässig sind. Die Schachtbegrenzungswände werden durch geneigte, jalousieartige Leitbleche gebildet, die von Sichtluft quer durchströmt werden. Der Kaskadensichter wird im Kreislaufbetrieb mit einer Gutbettwalzenmühle betrieben, wobei die Leitbleche zum Desagglomerieren, d.h. zum Aufschließen der in der Gutbettwalzenmühle gebildeten Schülpen dienen. Das Aufgabegut wird von oben dem Kaskadensichter aufgegeben und fällt über die treppenartig angeordneten Leitbleche nach unten und wird dabei desagglomeriert und gesichtet. Die Feinbestandteile werden zusammen mit der Sichtluft, dem Stabkorbsichter zugeführt, während die groben Bestandteile nach unten herausgeführt werden.From the DE 42 23 762 For example, there is known a sifter for sifting granular material having a rod sifter and an upstream, shaft-shaped cascade sifter. This cascade classifier has two inclined to the vertical, opposite and between them a caution zone forming Schachtbegrenzungswände, which are permeable to the Sichtluft. The shaft boundary walls are formed by inclined, louvre-like baffles, which are traversed by view air across. The cascade classifier is operated in circulatory operation with a good bed roller mill, wherein the baffles serve for deagglomerating, ie for unlocking the slugs formed in the high-bed roller mill. The feed material is fed from above the cascade classifier and falls over the staircase-like baffles down and is thereby deagglomerated and sighted. The fines, along with the classifying air, are fed to the rod cage sifter while the coarse components are led down.

Die Dimensionierung der Zuführorgane zum Sichter erfolgt anhand der zu bewältigenden Gutströme und liefert kompakte schmale Massenströme im Vergleich zum Sichter. Die Anforderungen an eine hohe Sichteffizienz verlangen zum einen die Begrenzung der Aufgabemenge pro Sichterbreite und zum anderen eine ausreichende Zahl von - aus Materialflussrichtung - sequentiell geschalteten Sichtstufen der Kaskade. Als weitere wesentliche Einflussgrößen auf die Sichteffizienz wirken sich die Gleichmäßigkeit der Breitenverteilung von Sichtgut und Sichtluft aus. Bei breiteren Sichtern ist diese Gleichmäßigkeit schwieriger zu realisieren, weshalb die Zahl der Sichtstufen mit der Größe zunimmt. Bei Sichtern für kleine Aufgabemengen liegt das Breiten-/Höhenverhältnis daher bei etwa 0,15 und nimmt bei größeren Mengen auf ca. 0,35 zu. Diese hohen und schmalen Bauformen führen zu großen Kosten für die Materialtransporte und die Gebäude.The dimensioning of the feed to the separator takes place on the basis of the Gutströme to be handled and provides compact narrow mass flows compared to the classifier. The requirements for a high visual efficiency demand on the one hand the limitation of the feed quantity per classifier width and on the other hand a sufficient number of - from material flow direction - sequentially switched sight levels of the cascade. Another important factor influencing the visual efficiency is the uniformity of the width distribution of the visible material and the classifying air. With wider classifiers, this uniformity is more difficult to realize, which is why the number of vision stages increases with size. With classifiers for small feed quantities, the width / height ratio is therefore about 0.15 and increases to about 0.35 for larger quantities. These tall and narrow designs lead to high costs for the transport of materials and the buildings.

In der DE 103 50 518 , die einen statisch-dynamischen Sichter gemäß dem Oberbegriff des Anspruchs 1 offenbart, wird daher bei großen Durchsatzleistungen eine Sichtereinrichtung zum Sichten von körnigem Gut vorgeschlagen, die einen statischen Kaskadensichter mit wenigstens einer vom schachtförmigen Sichtgehäuse umschlossenen und einem von der Vertikalen abweichenden Winkel schrägliegend angeordneten Sichtzone und einen dynamischen Stabkorbsichter umfasst. Die Besonderheit besteht darin, dass das Sichtgaseintrittsgehäuse der Sichteinrichtung in der Draufsicht betrachtet eine Strömungsverzweigung auf zwei Stränge nach Art eines Hosenrohres aufweist, wobei in beiden Hosenrohr-Gehäuseabzweigen ein fliegend gelagerter Stabkorb angeordnet ist. Die spiegelbildlich gegenüberliegend angeordneten stirnseitigen Stabkorb-Austragsenden sind zum Auslass des mit Feingut beladenden Sichtgasstromes über einen weiteren Gehäuseteil zu einem gemeinsamen Abzugsgehäuse zusammengeführt. Gemäß einer ersten Variante sind in beiden Hosenrohr-Gehäuseabzweigen jeweils ein statischer Kaskadensichter angeordnet. In einer zweiten Variante ist ein gemeinsamer Kaskadensichter vor der Verzweigung vorgesehen.In the DE 103 50 518 Therefore, in the case of high throughput rates, a sifting device for sifting granular material is proposed which comprises a static cascade classifier with at least one viewing zone enclosed by the shaft-shaped viewing housing and an angle deviating from the vertical and a dynamic rod cage sifter. The peculiarity is that viewed in plan view, the Sichtgasseintrittsgehäuse the viewing device has a flow branching on two strands in the manner of a bifurcated tube, wherein in both bifurcated tube housing branches a cantilevered rod basket is arranged. The mirror-image oppositely arranged end-side bar basket discharge ends are brought together to the outlet of the loading gas flow laden with fines via a further housing part to a common trigger housing. According to a first variant, a static cascade classifier is arranged in each of the two branch pipe branch branches. In a second variant, a common cascade classifier is provided before the branch.

Die Ausführungsform mit jeweils zwei separaten Kaskadensichtern und zwei separaten Stabkorbsichtern verursacht relativ hohe Kosten. Aber auch die Variante mit einem gemeinsamen Kaskadensichter ist relativ teuer, da der Kaskadensichter bei einer hohen Durchsatzleistung durch sein ungünstiges Breiten/Höhenverhältnis eine sehr hohe Bauhöhe benötigt.The embodiment with two separate cascade classifiers and two separate rod basket classifiers causes relatively high costs. But even the variant with a common Cascade classifier is relatively expensive, since the Cascade classifier at a high throughput due to its unfavorable width / height ratio requires a very high height.

In der EP-A-0 392 455 wird ferner eine Reinigungsmaschine beschrieben, die zwei hintereinander geschaltete statisches Sichter und ein Abscheider umfasst. Die DE-A-101 37 132 betrifft einen Sichter mit einem Fallschacht, einer ersten Klassierstufe, einem Steigschacht, einer zweiten Klassierstufe und einer Abscheideeinrichtung. Beide Klassierstufen sind dabei als statische Sichtstufen ausgebildet.In the EP-A-0 392 455 Furthermore, a cleaning machine is described which comprises two static visors connected in series and a separator. The DE-A-101 37 132 relates to a sifter with a chute, a first classifier, a riser, a second classifier and a separator. Both classification levels are designed as static viewing levels.

Der Erfindung liegt die Aufgabe zugrunde, die Bauhöhe eines statisch-dynamischen Sichters wesentlich zu verkleinern und die Sichteffizienz bei statisch-dynamischen Sichtern mit unterschiedlichen Durchsatzleistungen zu verbessern.The invention has for its object to significantly reduce the height of a static-dynamic classifier and improve the visual efficiency of static-dynamic classifiers with different throughputs.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruches 1 gelöst.According to the invention, this object is solved by the features of claim 1.

Der erfindungsgemäße statisch-dynamische Sichter zum Sichten von Aufgabegut besteht im Wesentlichen aus einem statischen Sichter, der einen schräg zur Vertikalen ausgerichteten, von Sichtgas durchströmten Belüftungsboden aufweist, einer Einlassöffnung zur Aufgabe des Aufgabegutes auf den Belüftungsboden, einer Auslassöffnung für das Grobgut, einem nachgeschalteten dynamischen Sichter, der wenigstens einen Rotor umfasst und einer Auslassöffnung für das mit Feingut beladende Sichtgas. Der Belüftungsboden weist dabei ein Verhältnis von Breite zu vertikaler Höhe von wenigstens 0.45, vorzugsweise von wenigstens 0.6, auf.The inventive static-dynamic sifter for sifting feed essentially consists of a static sifter which has a ventilation floor oriented obliquely to the vertical, through which viewing gas flows, an inlet opening for discharging the feed material onto the aeration floor, an outlet opening for the coarse material, a downstream dynamic one Classifier comprising at least one rotor and an outlet opening for the fine gas laden sighting gas. The aeration bottom has a ratio of width to vertical height of at least 0.45, preferably of at least 0.6.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further embodiments of the invention are the subject of the dependent claims.

Gemäß einer bevorzugten Ausführungsform ist ferner eine Einrichtung zum Verteilen des Aufgabegutes über die Breite des Belüftungsbodens vorgesehen. Weiterhin sind dem statischen Sichter zweckmäßigerweise Mittel zum Desagglomerieren vorgeschaltet.According to a preferred embodiment, a device for distributing the feed over the width of the ventilation floor is further provided. Furthermore, the static sifter expediently preceded by means for deagglomerating.

Gemäß einer bevorzugten Ausführungsform ist die Oberfläche des Belüftungsbodens plan ausgebildet und mit Belüftungsöffnungen, insbesondere Belüftungsschlitzen, versehen. Der Belüftungsboden wird mit einem Winkel zwischen 20° und 70°, vorzugsweise zwischen 30° und 60°, zur Vertikalen geneigt angeordnet.According to a preferred embodiment, the surface of the ventilation floor is flat and provided with ventilation openings, in particular ventilation slots. The ventilation floor is inclined at an angle between 20 ° and 70 °, preferably between 30 ° and 60 °, to the vertical.

Gemäß einer bevorzugten Ausgestaltung der Erfindung unterscheiden sich die Belüftungsböden der Vorrichtungen im Rahmen einer Baureihe für verschiedene Durchsatzleistungen nur in der Breite und nicht in der vertikalen Höhe voneinander. Dies bewirkt neben dem ohnehin schon wesentlich günstigeren Verhältnis von Breite zu vertikaler Höhe auch dann keine Steigerung der Bauhöhe, wenn die Vorrichtung mit einer höheren Durchsatzleistung konzipiert werden muss.According to a preferred embodiment of the invention, the ventilation floors of the devices differ in the context of a series for different throughputs only in the width and not in the vertical height of each other. This causes in addition to the already much more favorable ratio of width to vertical height and then no increase in height, if the device must be designed with a higher throughput.

Weitere Vorteile und Ausgestaltungen der Erfindung werden im Folgenden anhand der Beschreibung einiger Ausführungsbeispiele und der Zeichnung näher erläutert.Further advantages and embodiments of the invention will be explained in more detail below with reference to the description of some embodiments and the drawings.

In der Zeichnung zeigen

Fig. 1
eine schematische Seitenansicht der Vorrichtung zum Sichten,
Fig. 2
eine schematische Schnittdarstellung längs der Linie III-III der Fig. 1,
Fig. 3
eine Schnittdarstellung des Details III der Fig. 1,
Fig. 4
ein Flussdiagramm einer Mahlanlage mit einer erfindungsgemäßen Vorrichtung zum Sichten,
Fig. 5
eine Seitenansicht einer Vorrichtung zum Sichten mit einer Verteileinrichtung gemäß eines ersten Ausführungsbeispiels,
Fig. 6
eine schematische Schnittdarstellung längs der Linie VI-VI der Fig. 5,
Fig. 7
eine schematische Seitenansicht einer Vorrichtung zum Sichten mit einer Einrichtung zum Verteilen gemäß eines zweiten Ausführungsbeispiels,
Fig. 8
eine schematische, teilweise geschnittene Draufsicht der Fig. 7,
Fig. 9
eine schematische Ansicht von Mitteln zum Desagglomerieren gemäß eines ersten Ausführungsbeispiels und
Fig. 10
eine schematische Ansicht von Mitteln zum Desagglomerieren gemäß eines zweiten Ausführungsbeispiels.
In the drawing show
Fig. 1
a schematic side view of the device for sifting,
Fig. 2
a schematic sectional view taken along the line III-III of Fig. 1 .
Fig. 3
a sectional view of the detail III of Fig. 1 .
Fig. 4
a flow diagram of a grinding plant with a device according to the invention for sighting,
Fig. 5
a side view of a device for sifting with a distribution device according to a first embodiment,
Fig. 6
a schematic sectional view along the line VI-VI of Fig. 5 .
Fig. 7
1 is a schematic side view of a device for sifting with a device for distributing according to a second embodiment,
Fig. 8
a schematic, partially sectioned plan view of Fig. 7 .
Fig. 9
a schematic view of means for deagglomerating according to a first embodiment and
Fig. 10
a schematic view of means for deagglomerating according to a second embodiment.

Der in den Figuren 1 bis 3 dargestellte statisch-dynamische Sichter 100 zum Sichten von Aufgabegut besteht im Wesentlichen aus einem statischen Sichter 1, der einen schräg zur Vertikalen ausgerichteten, von Sichtgas 2 durchströmbaren Belüftungsboden 1a, einer Einlassöffnung 3 zur Aufgabe des Aufgabegutes 9 auf den Belüftungsboden, einer Auslassöffnung 4 für das Grobgut, einem nachgeschalteten dynamischen Sichter 5, der wenigstens einen Rotor 5a umfasst, und wenigstens einer Auslassöffnung 6 für das mit Feingut beladene Sichtgas 2'.The in the FIGS. 1 to 3 shown static-dynamic classifier 100 for sifting of feed material consists essentially of a static classifier 1, which is oriented obliquely to the vertical, by the sighting gas 2 can be flowed through aeration bottom 1a, an inlet opening 3 for the task of the feed material 9 on the ventilation floor, an outlet opening 4 for the Grobgut, a downstream dynamic classifier 5, which comprises at least one rotor 5a, and at least one outlet opening 6 for the loaded with fines sighting gas 2 '.

Der Belüftungsboden 1a ist mit einem Winkel α zwischen 20° und 70°, vorzugsweise zwischen 30° und 60°, zur Vertikalen geneigt angeordnet. Im dargestellten Ausführungsbeispiel ist die Oberfläche des Belüftungsboden 1a plan ausgebildet und mit Belüftungsöffnungen 1b, insbesondere Belüftungsschlitzen versehen (siehe Fig. 3).The ventilation base 1a is inclined at an angle α between 20 ° and 70 °, preferably between 30 ° and 60 °, to the vertical. In the illustrated embodiment, the surface of the ventilation floor 1a is flat and provided with ventilation openings 1b, in particular ventilation slots (see Fig. 3 ).

Der Belüftungsboden 1a weist ein Verhältnis von Breite b zu vertikaler Höhe h von wenigstens 0,45 vorzugsweise von wenigstens 0,6, auf. Demnach ist die Breite des Belüftungsbodens wesentlich größer als bei bekannten leistungsgleichen Ausführungen und trägt daher zur Verringerung der Bauhöhe der Vorrichtung zum Sichten entscheidend bei. (Bemerkung: Beim b/h = 0,6 ist die Breite kleiner als die Höhe!).The ventilation base 1a has a ratio of width b to vertical height h of at least 0.45, preferably of at least 0.6. Accordingly, the width of the ventilation floor is much larger than in known equivalent power versions and therefore contributes to reducing the height of the device for sifting crucial. (Note: At b / h = 0.6, the width is smaller than the height!).

Der statische Sichter 1 und der dynamische Sichter 5 sind in einem gemeinsamen Gehäuse 7 untergebracht, wobei der dynamische Sichter in der in Fig. 1 gezeigten Seitenansicht schräg oberhalb des Belüftungsbodens angeordnet ist.The static sifter 1 and the dynamic sifter 5 are housed in a common housing 7, wherein the dynamic sifter in the in Fig. 1 shown side view is arranged obliquely above the ventilation floor.

Das über die Einlassöffnung 3 zugeführte Aufgabegut 9 rutscht über den Belüftungsboden 1a nach unten und wird dabei vom Sichtgas quer durchströmt. Das Feingut des Aufgabegutes wird mit dem Sichtgas 2 zum dynamischen Sichter getragen, der ein oder mehrere Rotoren, insbesondere Stabkörbe umfasst.The feed material 9 supplied via the inlet opening 3 slides down over the ventilation floor 1a and is traversed transversely by the viewing gas. The Fine material of the feed material is carried with the classifying gas 2 to the dynamic classifier, which comprises one or more rotors, in particular rod baskets.

Die im Bereich des Rotors abgewiesene Mittelkornfraktion wird über eine innerhalb des Gehäuses angeordnete Rückführung 8 zur Auslassöffnung 4 für das Grobgut geleitet. Der Rotor ist zweckmäßigerweise beidseitig gelagert und kann in seiner Breite der Breite des Belüftungsbodens entsprechen. Es wäre aber auch denkbar, dass die Breite des Rotors größer bzw. insbesondere kleiner als die Breite des Belüftungsboden ausgebildet ist. Für diesen Fall ist zwischen dem statischen und dynamischen Sichter ein Gehäuseübergangsstück vorgesehen, welches die unterschiedlich breiten Gehäusebereiche des Gehäuses 7 im Bereich des statischen Sichters bzw. des dynamischen Sichters miteinander verbindet.The rejected in the region of the rotor medium grain fraction is passed through a disposed within the housing return 8 to the outlet opening 4 for the coarse material. The rotor is expediently mounted on both sides and can correspond in its width to the width of the ventilation floor. It would also be conceivable that the width of the rotor is larger or in particular smaller than the width of the ventilation floor is formed. For this case, a housing transition piece is provided between the static and dynamic classifier, which connects the housing sections of the housing 7 of different widths in the area of the static classifier or the dynamic classifier.

In Fig. 4 ist der statisch-dynamische Sichter 100 zum Sichten mit einer Gutbettwalzenmühle 200 dargestellt. Der statisch-dynamische Sichter 100 umfasst noch eine Einrichtung 101 zum Verteilen des Aufgabegutes über die Breite des Belüftungsbodens 1a sowie Mittel 102 zum Desagglomerieren des von der Gutbettwalzenmühle 200 zum statisch-dynamischen Sichter zurückgeführten Gutes.In Fig. 4 For example, the static-dynamic classifier 100 is shown for viewing with a good bed roller mill 200. The static-dynamic sifter 100 also comprises a device 101 for distributing the feed material across the width of the aeration bottom 1a and means 102 for deagglomerating the material returned from the good-bed roller mill 200 to the static-dynamic sifter.

In den Figuren 5 und 6 ist ein erstes Ausführungsbeispiel einer Einrichtung 101 zum Verteilen des Aufgabegutes über die Breite des Belüftungsbodens dargestellt. Diese Einrichtung besteht im dargestellten Ausführungsbeispiel aus Leitblechen die im Zuführschacht 7a des Gehäuses 7 angeordnet sind. Die Leitbleche 101 a sind dabei so ausgebildet, dass sie das Aufgabegut 9, welches über Fördermittel 10 in einer bestimmten Breite aufgegeben wird, auf die Breite b des Belüftungsbodens 1a verteilen.In the Figures 5 and 6 a first embodiment of a device 101 for distributing the feed over the width of the ventilation floor is shown. This device consists in the illustrated embodiment of baffles which are arranged in the feed chute 7a of the housing 7. The baffles 101 a are designed so that they distribute the feed material 9, which is placed over conveyor 10 in a certain width, to the width b of the ventilation floor 1a.

Anstelle einer statischen Einrichtung zum Verteilen des Aufgabegutes sind aber auch dynamische Mittel denkbar. In den Figuren 7 und 8 wird die Einrichtung 101 durch eine vibrierende Rinne 101'a gebildet.Instead of a static device for distributing the feed but also dynamic means are conceivable. In the FIGS. 7 and 8th the device 101 is formed by a vibrating groove 101'a.

Für die vorgeschalteten Mittel 102 zum Desagglomerieren kommt beispielsweise ein Schülpenbrecher 102a gemäß Fig. 10 in Betracht, der zweckmäßigerweise unterhalb der Gutbettwalzenmühle 200 angeordnet wird. Als Alternative wäre beispielsweise aber auch ein Schleuderrad 102'a gemäß Fig. 9 denkbar.For the upstream means 102 for deagglomerating, for example, a bellows breaker 102a is used Fig. 10 in consideration, which is conveniently placed below the Goodbettwalzenmühle 200. As an alternative, for example, but also a blast wheel 102'a according to Fig. 9 conceivable.

Der Massenstrom des Aufgabegutes auf dem Belüftungsboden 1a nimmt von oben nach unten ab, da während der Verweilzeit immer mehr Feingut mit der Sichtluft ausgetragen wird. Dadurch verringert sich der Durchflusswiderstand des Aufgabegutes in Richtung zur Auslassöffnung 4 für das Grobgut. Damit die Sichtluft trotzdem gleichmäßig durch das Aufgabegut strömen kann, ist der Belüftungsboden derart ausgebildet, dass er einen Druckabfall von 2 mbar bis 8 mbar, vorzugsweise 3 mbar bis 4 mbar erzeugt.The mass flow of the feed material on the aeration bottom 1a decreases from top to bottom, since during the residence more and more fines are discharged with the classifying air. This reduces the flow resistance of the feed material in the direction of the outlet opening 4 for the coarse material. So that the classifying air can nevertheless flow uniformly through the feed material, the aeration bottom is designed such that it produces a pressure drop of 2 mbar to 8 mbar, preferably 3 mbar to 4 mbar.

Der obenbeschriebene statisch-dynamische Sichter zeichnet sich dadurch aus, dass sich die Belüftungsböden 1a von Sichtern im Rahmen einer Baureihe für verschiedene Durchsatzleistungen nur in der Breite b und nicht in der vertikalen Höhe h voneinander unterscheiden. Dies bedeutet, dass sich die statisch-dynamischen Sichter lediglich in der Breite vergrößert, während die Bauhöhe im Wesentlichen gleich bleibt. Dies wiederum bedeutet, dass die Sichteffizienz für Sichter mit unterschiedlichen Durchsatzleistungen im Wesentlichen gleich sind, da im Gegensatz zu herkömmlichen Vorrichtungen die Verweilzeit, die im Wesentlichen durch die vertikale Höhe bestimmt wird, unverändert bleibt.The static-dynamic classifier described above is distinguished by the fact that the aeration bottoms 1a of classifiers for a different throughput rate differ only in the width b and not in the vertical height h from each other. This means that the static-dynamic classifier only increases in width, while the overall height remains essentially the same. This, in turn, means that the visual efficiency is substantially the same for classifiers with different throughputs, since, unlike conventional devices, the dwell time, which is essentially determined by the vertical height, remains unchanged.

Mit zunehmender Breite wird die Einrichtung zum Verteilen des Aufgabegutes über die Breite des Belüftungsbodens immer wichtiger. Im Rahmen der Baureihenbetrachtung wird die Breite des dynamischen Rotors vorzugsweise linear mit der Breite des statischen Belüftungsbodens verändert. Dabei kann die Breite des Rotors prinzipiell von der Breite der statischen Stufe abweichen. Insbesondere sind die Anforderungen in der Fertigmahlung und Teilfertigmahlung mit partieller Fertiggutausschleusung im Produktionsprozess grundsätzlich unterschiedlich, so dass hier feste Kombinationen unterschiedlich breiter statischer und dynamischer Sichter eingesetzt werden können. Die Sichträume der statischen und der dynamischen Stufe werden dann ggf. über Übergangsstücke verbunden.With increasing width, the device for distributing the feed over the width of the ventilation floor is becoming increasingly important. As part of the series consideration, the width of the dynamic rotor is preferably changed linearly with the width of the static ventilation floor. The width of the rotor may differ in principle from the width of the static stage. In particular, the requirements in the final grinding and partial finishing with partial Fertiggutausschleusung in the production process are fundamentally different, so that here fixed combinations of different width static and dynamic classifier can be used. The viewing spaces of the static and dynamic stages are then connected via transition pieces if necessary.

Je stärker der Belüftungsboden 1a belüftet wird, desto flacher kann er eingebaut werden. Unter Berücksichtigung des üblichen Sichtluftbedarfs und des Materialfließverhaltens wird man vorzugsweise eine Neigung ca. 45° + -10° verwenden. Dabei wird die Luftaustrittsgeschwindigkeit aus dem Belüftungsboden so hoch gewählt, dass das Aufgabegut überwiegend in der Schwebe gehalten wird und nur das grobe Gut den Belüftungsboden berührt. Damit wird auch verhindert, dass das Gut die Belüftungsöffnungen verstopft und es zu Ablagerungen kommt. Um dies zu erreichen, sollten Luftgeschwindigkeiten an den Austrittsöffnungen 1b des Belüftungsbodens von mindestens 20 m/s, vorzugsweise von 30 m/s eingestellt werden.The more the ventilation floor 1a is ventilated, the flatter it can be installed. Taking into account the usual demand for visible air and the material flow behavior, it is preferable to use an inclination of approx. 45 ° + -10 °. The air outlet speed from the aeration floor is chosen so high that the feed material is predominantly held in suspension and only the coarse material touches the ventilation floor. This also prevents the material clogging the ventilation holes and deposits. To achieve this, air velocities should be set at the outlet openings 1b of the aeration bottom of at least 20 m / s, preferably 30 m / s.

Der erfindungsgemäße statisch-dynamische Sichter zeichnet sich durch eine hohe Sichteffizienz aus und benötigt im Vergleich zu den bekannten Kaskadensichtern eine wesentlich geringere Bauhöhe, wodurch Kosten eingespart werden.The static-dynamic classifier according to the invention is characterized by a high visual efficiency and, in comparison to the known cascade classifiers, requires a substantially smaller structural height, which saves costs.

Claims (9)

  1. Static-dynamic sifter for sifting (100) charge material, having
    a. a static sifter (1) which has an aerating base (1a) oriented at an angle relative to the vertical and through which sifting gas (2) may flow,
    b. an inlet opening (3) for delivering the charge material (9) to the aerating base (1a),
    c. an outlet opening (4) for the coarse material,
    d. a dynamic sifter (5), located downstream, which comprises at least one rotor (5a), and
    e. at least one outlet opening (6) for the sifting gas (2') laden with fine material,
    characterised in that
    the aerating base (1a) has a width (b) to vertical height (h) ratio of at least 0.45, preferably of at least 0.6.
  2. Sifter according to claim 1, characterised in that a device (101) for uniformly distributing the charge material over the width of the aerating base is also provided.
  3. Sifter according to claim 1, wherein disagglomerating means (102) are arranged upstream of the static sifter.
  4. Sifter according to claim 1, wherein the width of the rotor (5a) is different from the width of the aerating base (1a), and a housing transition portion is provided between the static and dynamic sifters.
  5. Sifter according to claim 1, wherein the surface of the aerating base (1a) is planar and is provided with aerating openings (1b).
  6. Sifter according to claim 1, characterised in that the aerating base (1a) is at an angle of from 20° to 70°, preferably from 30° to 60°, relative to the vertical.
  7. Sifter according to claim 1, wherein the aerating base (1a) is in such a form that it produces a pressure drop of from 2 mbar to 8 mbar, preferably from 3 mbar to 4 mbar.
  8. Sifter according to claim 1, wherein the aerating bases (1a) of devices within a line for different throughputs differ from one another only in terms of their width (b) and not in terms of their vertical height (h).
  9. Milling installation having a device according to one or more of claims 1 to 8 as well as a material bed roller mill.
EP06791672A 2005-09-23 2006-08-25 Apparatus for classifying charge material Active EP1786573B1 (en)

Applications Claiming Priority (2)

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DE102005045591A DE102005045591A1 (en) 2005-09-23 2005-09-23 Raw material e.g. granular material, separating device for use in grinding plant, has static separator with aeration base through which gas flows, where base is arranged in vertical direction and has specific ratio of breadth to height
PCT/EP2006/008363 WO2007036276A1 (en) 2005-09-23 2006-08-25 Apparatus for classifying charge material

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EP1786573B1 true EP1786573B1 (en) 2010-06-09

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JP (1) JP5491029B2 (en)
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AT (1) ATE470514T1 (en)
BR (1) BRPI0616336A8 (en)
CA (1) CA2623147C (en)
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BRPI0616336A8 (en) 2015-04-28
ES2344022T3 (en) 2010-08-16
CA2623147C (en) 2015-09-29
JP5491029B2 (en) 2014-05-14
CN101272871B (en) 2013-03-06
WO2007036276A1 (en) 2007-04-05
CA2623147A1 (en) 2007-04-05
DE502006007156D1 (en) 2010-07-22
CN101272871A (en) 2008-09-24
DE102005045591A1 (en) 2007-03-29
DK1786573T3 (en) 2010-10-04
EP1786573A1 (en) 2007-05-23
JP2009508680A (en) 2009-03-05
BRPI0616336A2 (en) 2011-06-14
ATE470514T1 (en) 2010-06-15
US20080185318A1 (en) 2008-08-07

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