EP0384101A1 - Air classifier for sifting a granular material, and grinding plant employing such a classifier - Google Patents

Air classifier for sifting a granular material, and grinding plant employing such a classifier Download PDF

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Publication number
EP0384101A1
EP0384101A1 EP90100132A EP90100132A EP0384101A1 EP 0384101 A1 EP0384101 A1 EP 0384101A1 EP 90100132 A EP90100132 A EP 90100132A EP 90100132 A EP90100132 A EP 90100132A EP 0384101 A1 EP0384101 A1 EP 0384101A1
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EP
European Patent Office
Prior art keywords
classifier
sifter
discharge
tube mill
finer
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
EP90100132A
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German (de)
French (fr)
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EP0384101B1 (en
Inventor
Albert Süssegger
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Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Priority to DE9007802U priority Critical patent/DE9007802U1/en
Publication of EP0384101A1 publication Critical patent/EP0384101A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • the invention relates to a sifter for sifting granular material, with a visible air inlet and inlet for the material to be sifted and with a sifting air and fine material outlet, as well as with a coarse material discharge for discharging the manure.
  • the invention also relates to a grinding plant in which such a classifier is switched on.
  • the invention has for its object to provide a classifier which is suitable to be switched on in a high-pressure roller press, a tube mill and a classifier having a circulation grinding system in such a way that the above-described energy-consuming venting and material pressing difficulties in the nip of the roller press are significantly reduced.
  • wear of the classifier particularly if it is a turbo-wind classifier, should be reduced when the invention is used.
  • the sifter according to the invention has at least two separate Greisses discharge openings, namely a discharge opening for coarse size and a discharge opening for finer size.
  • the grain size of the coarse semolina can e.g. B. greater than 0.5 mm and the grain size of the finer semolina z. B. be less than 0.5 mm. If one switches such a new classifier into a circulation grinding plant with a high-pressure roller press and tube mill, the possibility is created to recirculate the coarse size of the classifier for the good job of the high-pressure roller press and the finer size of the same classifier for the good task of the tube mill.
  • the high-pressure roller press is relieved of the fine material of the classifier, which significantly reduces the bleeding and material pressing difficulties in the roller gap of the roller press.
  • the operation of the roller press becomes more uniform and the energy saving associated with material bed crushing is not reduced by the difficulties described above.
  • the invention can basically be applied to a dynamic and static classifier.
  • the classifier according to the invention is advantageously a dynamic classifier, with a classifier housing, in the lower region of which the viewing air inlet opening and the discharge opening for the coarse grains and in the upper region a rotatably arranged rod basket with turbo is arranged elements which are surrounded by arranged around the circumference of the guide elements.
  • a turbo air classifier the preliminary separation of the coarse size reduces the wear on the classifier rotor, on the guide elements and on the other parts of the classifier, because in the classifier according to the invention, the coarse size before it can come into contact with the classifier internals from the classifier (separate from the finer semolina).
  • the sifter according to the invention is suitable in a rotary grinding plant with a high-pressure roller press and with a fine comminution device such as. B. tube mill to be turned on in such a way that the sifter discharge for the coarse grains for good work of the roller press and the sifter discharge for fine grains for the good work of the pipe mill are returned.
  • a fine comminution device such as. B. tube mill
  • the classifier according to FIG. 1 has a housing (10) which, seen in vertical section, tapers conically downwards in its lower region and conically upwards in its upper region.
  • a pipe (11) is inserted into the lower end of the classifier housing (10), through which the classifying air flow (12), loaded with material to be viewed, is introduced into the classifier from below.
  • the loaded stream of sifted air flows from the bottom upwards through the sifter housing (10), is deflected in its upper region, flows between the circumferential, leaf-shaped, optionally adjustable guide elements (13) into the annular channel-shaped viewing zone (14) and into the rotatably arranged sifter housing and from above via a shaft (15) driven sifting rotor or rod basket (16), which its circumference carries sheet-shaped turbo elements (17) and is closed at the bottom by a floor.
  • the classifier according to the invention according to FIG. 1 has in its lower region a pre-separation zone for the coarse grains, which also collect as a result of the cross-sectional expansion of the classifier housing (10) in the annular space (18) between the classifier housing and the tube (11) projecting into it from below which are carried out via the obliquely downwardly inclined tube (19).
  • the operating conditions of the classifier can be set so that the grain size of the discharged coarse semolina (20) z. B. is greater than 0.5 mm. It is understood that the built-in sifter is not stressed by the pre-separated coarse gravel (20), whereby the wear of the sifter according to the invention is reduced overall.
  • the finer semolina remaining in the air flow falls downward in the annular channel-shaped viewing space (14) and is passed down via a cone (21) which is located on the underside of the guide elements (13) connects, collected and over an obliquely downward inclined tube (22) as finer semolina (23) with a grain size of z. B. less than 0.5 mm separated from the coarse semolina (20) from the classifier.
  • the fine material is entrained by the sifting air flow and withdrawn from the sifter with this via a non-rotating fines discharge housing (24) placed on the rod basket (16), as indicated by arrow (25).
  • the classifier of FIG. 1 is switched on in a recirculating grinding plant with a tube mill (26), which is preceded by a high-pressure roller press (27), the classifier discharge for the coarse grains (20) for good feed of the roll press and the classifier discharge for the finer semolina (23) are returned to the tube mill (26).
  • the high-pressure roller press (27) is the feed material to be shredded (28), e.g. B. not pre-shredded cement clinker with a grain size up to 100 mm, for example, via a feed shaft (29).
  • the grain size of an essential part of the feed material (28) is larger than the width of the narrowest nip of z. B.
  • the pressing force of the rollers of the roller press which presses on the material (28, 20), is more than 2 t / cm roller length, for example 6 to 9 t / cm.
  • the material to be fed is combined in the gap between the rollers by means of combined single grain size reduction and shredded material bed.
  • the feed material to be shredded is fed to the roll gap of the press (27) in such a large quantity via the feed shaft (29) arranged above the roll gap that the material to be shredded and drawn in between the rolls by friction pushes the rolls apart and the Particles of the feed material crush each other in the roller gap in a bed or in the collective or in a bed of material.
  • the cement clinker emerges from the roll nip, crushed and partially agglomerated, that is to say pressed into slugs (30), the proportion of particles already reduced to the desired cement fineness can already be relatively high (approx. 25% less than 90 ⁇ m). While the bulk density of the fresh ground material (28) is 1,600 kg / m3, the density of the pressed slug (30) is approx. 2,400 kg / m3.
  • the tube mill (26) of FIG. 2 is an airflow mill with a central good inlet opening (31) through one end wall spigot and a central discharge opening (32) through the other end wall spigot.
  • the tube mill has, as usual, a discharge wall (33) in front of its discharge opening (32), the openings of which only allow pre-ground material of a certain grain size to pass through, which is represented by the arrow (34).
  • the discharge (30) of the roller press (27) is introduced into the material discharge of the tube mill (26) through a central scraper pre-shredding device, which may not be present, through the central mill discharge opening (32) and through the central opening of the discharge wall (33), in countercurrent to the tube mill discharge material, which together with the roller press discharge deagglomerated in the deagglomerating chamber (35) through peripheral openings of the same discharge wall (33) as material flow (34) via the riser pipe (11), the lower part (11a) of which passes to the central material discharge opening (32 ) connects to the tube mill, is transported pneumatically to the classifier (10) with the aid of a conveying air flow (36).
  • the roller press discharge material (30) arriving in the deagglomeration chamber (35) of the tube mill (26) (broken fragments) is designated by reference number (37a). These Schülpen Fragments (37a) are dissolved autogenously by pure circulation movement.
  • the classifier (10) sifts the sufficiently fine finished product both from the deagglomerated roller press discharge material (30) and from the grinding product of the tube mill (26), namely as a fine grain fraction, which via the line (25) and dust separator (37), e.g. . B. electrostatic dust collector is withdrawn, from which the fine finished product (38), in the exemplary embodiment of the sufficiently finely ground cement, is withdrawn.
  • An induced draft fan is indicated by (39).
  • an originally existing tube mill can be used without having to be converted.
  • a perforated partition wall (41) can advantageously be installed in the tube mill (26) at a distance from the discharge wall (33) which is present anyway, which separates the actual grinding chamber containing the grinding media (42) from the one between the discharge wall (33) and the partition wall (41) located disagglomerating chamber (35), unless the tube mill was already originally a two-chamber mill with a partition.
  • the tube mill can also have a material failure housing with a bucket elevator for transporting the ground material to the classifier.
  • the circulation grinding plant of FIG. 2 can be used as a grinding drying plant for grinding and drying moist material, for. B. from moist starting material for the production of raw cement meal.
  • the riser (11) between the mill (26) and classifier (10) serves as a current dryer. It is possible to branch off a partial flow (44) from the drying gas flow (43) after the induced draft fan (39) and to add this to the fresh hot gas flow (36) via line (45) and / or via line (46) below into the flow dryer (11).
  • the tube mill (26) another fine comminution device would also be conceivable.
  • Fig. 3 shows the flow diagram of a grinding drying plant for grinding and drying of moist starting material for the production of raw cement meal.
  • the starting material (28) is fed through the feed shaft (29) of the high-pressure roller press (27) and comminuted there, as in the exemplary embodiment in FIG. 2.
  • the slugs (30) that are formed are placed over a
  • Exhaust gas from a preheater for cement raw meal from a cement clinker combustion plant, hot exhaust air from a cement clinker cooler and / or hot gas from another hot gas generator can be used as hot gas.
  • the riser (11, 12) designed as a current dryer, in which the material is dried and which leads to the sifter (10), the sift discharge (19) for the coarse grains (20) a conveyor (52) for the feed (29) of the roller press (27) and the sifter discharge (22) for the finer grains (23) for the feed of a tube mill (26).
  • the finer semolina (23) are introduced into the tube mill (26) together with a hot gas stream (53) performed, which can be branched from the hot gas line (51), for. B. consists of hot flue gas or hot exhaust gas from a cement clinker combustion plant and, in so far, has inert gas properties.
  • the moist feed material (28) to be treated in the mill-drying system according to FIG. 3 is not moist cement raw materials, but rather e.g. B. is wet coal.
  • the material is introduced via line (54) into the riser (11, 12) leading to the classifier (10).
  • the fine material discharge line (25) of the classifier (10) leads to the separator (37) such as a filter, separating cyclone or the like, which is conveyed via a conveyor (55), e.g. B. screw conveyor the fines as finished goods (38), z. B. completely dried and ground cement raw meal or also completely dried and ground coal, from the classifying gas stream or drying gas stream (43).
  • the exhaust gas line (43) is connected via the branch line (44, 45) to the hot gas line (51) connected to the product inlet (49) of the deagglomerator (50) and / or via a branch line (46) to the product discharge of the deagglomerator (50) connected riser (11, 12) in connection.
  • FIG. 1 to 3 show a sifter
  • the feed material along with the view 4 shows a sifter (10), to which the feed material is fed separately from the classifying air.
  • This classifier (10) is also switched into a circulation grinding plant with a tube mill (26) and high-pressure roller press (27).
  • the discharge line (20) of the classifier (10) for the coarse semolina to feed the high-pressure roller press (27) and the discharge line (23) for the finer semolina to the material inlet of the tube mill (26) are recirculated.
  • the mill (26) can be operated in an open pass.
  • the material to be discharged from the mill is fed via line (56) to a spreading disc rotating within the classifier (10).

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Cyclones (AREA)
  • Lubricants (AREA)

Abstract

In order to ensure in a recirculating grinding plant having a choke feed roll press (27), tube mill (26) and air classifier (10) with recirculation of the classifier oversizes that as far as possible no energy-consuming problems relating to ventilation and the pressing of material occur in the choke bed in the roll nip of the roll press, it is proposed to build into the recirculating grinding plant an air classifier (10) such as is characterised by at least two mutually separate oversize removal openings, to be precise a removal opening (19, 20) for coarse oversizes and a removal opening (22, 23) separate therefrom for finer oversizes, and to recirculate to the high-pressure roll press (27) only the coarse oversizes, and to the tube mill (26) only the finer oversizes. <IMAGE>

Description

Die Erfindung betrifft einen Sichter zum Sichten von körnigem Gut, mit einem Sichtlufteintritt und Eintritt für das zu sichtende Gut und mit einem Sichtluft- und Feingutaustritt sowie mit einem Grobgutaustrag zum Austrag der Grieße. Außerdem betrifft die Erfindung eine Mahlanlage, in der ein solcher Sichter eingeschaltet ist.The invention relates to a sifter for sifting granular material, with a visible air inlet and inlet for the material to be sifted and with a sifting air and fine material outlet, as well as with a coarse material discharge for discharging the manure. The invention also relates to a grinding plant in which such a classifier is switched on.

Beim Betrieb von Hochdruck-Walzenpressen zum Verdichten bzw. zur Druckbehandlung körnigen Gutes, z. B. zum Zwecke der sogenannten Gutbett­zerkleinerung spröden Mahlgutes wie z. B. Ze­ mentklinker (EP-PS 0 084 383) muß das dem Wal­zenspalt zugeführte Aufgabegut von den gegen­läufig angetriebenen Walzen erfaßt und durch Reibung in den Walzenspalt eingezogen werden. Dabei werden die einzelnen Partikel des durch Reibung in den Walzenspalt eingezogenen Mahlgu­tes in einem Gutbett, das heißt in einer zwi­schen den beiden Walzenoberflächen zusammenge­drückten Materialschüttung bei Anwendung eines extrem hohen Druckes gegenseitig zerquetscht. Das Guteinzugsvermögen der Walzen würde an sich verbessert werden, wenn das Aufgabegut in einer solchen Menge aufgegeben wird, daß sich über dem Walzenspalt im Aufgabeschacht eine hohe Aufgabegutschüttung bildet.When operating high-pressure roller presses for compacting or for pressure treatment of granular material, e.g. B. for the purpose of so-called material bed crushing brittle ground material such. B. Ze ment clinker (EP-PS 0 084 383), the feed material fed to the nip must be gripped by the oppositely driven rollers and drawn into the nip by friction. The individual particles of the ground material drawn into the nip by friction are crushed in a bed of material, that is to say in a bed of material compressed between the two roller surfaces when an extremely high pressure is applied. The feed capacity of the rollers would be improved per se if the feed material was fed in in such an amount that a high load of feed material was formed over the nip in the feed shaft.

Bekannt ist auch, eine solche Hochdruck-Walzen­presse zur Gutbettzerkleinerung körnigen Gutes einer Umlaufmahlanlage mit Rohrmühle und Sich­ter vorzuschalten und die Grieße des Sichters wenigstens zum Teil zur Gutaufgabe der Walzen­presse zu rezirkulieren. Dabei kann insbesonde­re bei hohen Füllständen und niedrigen Schütt­gewichten des dem Aufgabeschacht der Walzen­presse zugeführten Aufgabegutes, verstärkt her­vorgerufen durch große Mengen bereits relativ feiner rezirkulierter Grieße zur Walzenpresse das Problem entstehen, daß die durch die Hoch­druckpressung aus der Aufgabegutschüttung ge­preßte Luft nicht mehr entweichen kann, was die Materialpressung und die mit der Gutbettzer­kleinerung an sich erzielbare Energieersparnis beeinträchtigt und zu einem ungleichmäßigen Be­trieb der Walzenpresse führt. Das Entlüftungs­problem im Walzenspalt wird noch dadurch ver­stärkt, daß die Schüttdichte der rezirkulierten Grieße in der Regel erheblich niedriger liegt als die Schüttdichte des frischen Aufgabegutes.It is also known to connect such a high-pressure roller press for comminuting granular material to granules of a recirculating grinding plant with a tube mill and classifier and to recirculate the size of the classifier at least in part for the purpose of the roller press. Especially with high fill levels and low bulk densities of the feed material fed to the feed shaft of the roller press, increasingly caused by large amounts of already relatively fine recirculated slurry to the roller press, the problem can arise that the air pressed by the high-pressure pressure from the feed material can no longer escape, which the Material pressure and the energy savings that can be achieved with material bed shredding are impaired and lead to uneven operation of the roller press. The venting problem in the roll nip is exacerbated by the fact that the bulk density of the recirculated semolina is generally considerably lower than the bulk density of the fresh feed.

Der Erfindung liegt die Aufgabe zugrunde, einen Sichter zu schaffen, der geeignet ist, in eine eine Hochdruck-Walzenpresse, eine Rohrmühle so­wie einen Sichter aufweisende Umlaufmahlanlage eingeschaltet zu werden in der Weise, daß die oben geschilderten energieverzehrenden Entlüf­tungs- und Materialpreßschwierigkeiten im Wal­zenspalt der Walzenpresse deutlich reduziert sind. Außerdem soll bei Anwendung der Erfindung der Verschleiß des Sichters, besonders wenn er ein Turbo-Windsichter ist, vermindert sein.The invention has for its object to provide a classifier which is suitable to be switched on in a high-pressure roller press, a tube mill and a classifier having a circulation grinding system in such a way that the above-described energy-consuming venting and material pressing difficulties in the nip of the roller press are significantly reduced. In addition, wear of the classifier, particularly if it is a turbo-wind classifier, should be reduced when the invention is used.

Diese Aufgabe wird gemäß der Erfindung mit einem Sichter bzw. mit einer einen Sichter beinhalten- den Umlaufmahlanlage gelöst, der bzw. die mit vorteilhaften Ausgestaltungen in den Ansprüchen 1 bis 7 gekennzeichnet sind.This object is achieved according to the invention with a sifter or with a recycle grinding system including a sifter, which are characterized by advantageous embodiments in claims 1 to 7.

Charakteristisch für den erfindungsgemäßen Sichter ist, daß er wenigstens zwei voneinander getrennte Grieße-Austragsöffnungen aufweist, nämlich eine Austragsöffnung für grobe Grieße und eine Austragsöffnung für feinere Grieße. Die Korngröße der groben Grieße kann z. B. grö­ßer 0,5 mm und die Korngröße der feineren Grie­ße kann z. B. kleiner 0,5 mm betragen. Schaltet man einen solchen neuartigen Sichter in eine Umlaufmahlanlage mit Hochdruck-Walzenpresse und Rohrmühle ein, so ist die Möglichkeit geschaf­fen, die groben Grieße des Sichters zur Gutauf­gabe der Hochdruck-Walzenpresse und die feine­ren Grieße desselben Sichters zur Gutaufgabe der Rohrmühle zu rezirkulieren. Dadurch wird die Hochdruck-Walzenpresse von den feinen Materialgrießen des Sichters gezielt entlastet, wodurch die Entlüftungs- und Materialpress-­Schwierigkeiten im Walzenspalt der Walzenpresse deutlich gemindert sind. Der Betrieb der Wal­zenpresse wird gleichmäßiger und die mit der Gutbettzerkleinerung verbundene Energieeinspa­rung wird nicht durch die oben geschilderten Schwierigkeiten gemindert. Die Erfindung kann grundsätzlich bei einem dynamischen und stati­schen Sichter angewandt werden.It is characteristic of the sifter according to the invention that it has at least two separate Greisses discharge openings, namely a discharge opening for coarse size and a discharge opening for finer size. The grain size of the coarse semolina can e.g. B. greater than 0.5 mm and the grain size of the finer semolina z. B. be less than 0.5 mm. If one switches such a new classifier into a circulation grinding plant with a high-pressure roller press and tube mill, the possibility is created to recirculate the coarse size of the classifier for the good job of the high-pressure roller press and the finer size of the same classifier for the good task of the tube mill. As a result, the high-pressure roller press is relieved of the fine material of the classifier, which significantly reduces the bleeding and material pressing difficulties in the roller gap of the roller press. The operation of the roller press becomes more uniform and the energy saving associated with material bed crushing is not reduced by the difficulties described above. The invention can basically be applied to a dynamic and static classifier.

Mit Vorteil ist der erfindungsgemäße Sichter ein dynamischer Sichter, mit einem Sichterge­häuse, in dessen unterem Bereich die Sichtluft­eintrittsöffnung und die Austragsöffnung für die groben Grieße und in dessen oberem Bereich ein rotierbar angeordneter Stabkorb mit Turbo­ elementen angeordnet ist, die von über den Um­fang verteilt angeordneten Leitelementen umge­ben sind. Gerade bei einem solchen Turbo-Wind­sichter wird durch die Vorabscheidung der gro­ben Grieße der Verschleiß am Sichterrotor, an den Leitelementen sowie an den anderen Sichter­innenteilen verringert, weil beim erfindungsge­mäßen Sichter die groben Grieße, bevor diese mit den Sichtereinbauten in Berührung kommen können, aus dem Sichter (getrennt von den feineren Grießen) abgezogen werden.The classifier according to the invention is advantageously a dynamic classifier, with a classifier housing, in the lower region of which the viewing air inlet opening and the discharge opening for the coarse grains and in the upper region a rotatably arranged rod basket with turbo is arranged elements which are surrounded by arranged around the circumference of the guide elements. Precisely in such a turbo air classifier, the preliminary separation of the coarse size reduces the wear on the classifier rotor, on the guide elements and on the other parts of the classifier, because in the classifier according to the invention, the coarse size before it can come into contact with the classifier internals from the classifier (separate from the finer semolina).

Der erfindungsgemäße Sichter ist geeignet, in eine Umlaufmahlanlage mit Hochdruck-Walzenpres­se und mit Feinzerkleinerungseinrichtung wie z. B. Rohrmühle eingeschaltet zu werden in der Weise, daß der Sichteraustrag für die groben Grieße zur Gutaufgabe der Walzenpresse und der Sichteraustrag für die feinen Grieße zur Gut­aufgabe der Rohrmühle zurückgeführt sind. Bei dieser Lösung arbeiten sowohl die Hochdruck-­Walzenpresse mit Gutbettzerkleinerung als auch die Rohrmühle unter optimalen Bedingungen.The sifter according to the invention is suitable in a rotary grinding plant with a high-pressure roller press and with a fine comminution device such as. B. tube mill to be turned on in such a way that the sifter discharge for the coarse grains for good work of the roller press and the sifter discharge for fine grains for the good work of the pipe mill are returned. With this solution, both the high-pressure roller press with material bed shredding and the tube mill work under optimal conditions.

Die Erfindung und deren weitere Merkmale und Vorteile werden anhand der in den Figuren sche­matisch dargestellten Ausführungsbeispiele näher erläutert.The invention and its further features and advantages are explained in more detail with reference to the exemplary embodiments shown schematically in the figures.

Es zeigt:

  • Fig. 1 schematisch im Vertikalschnitt eine erste Ausführungsform des erfindungsgemäßen Sichters;
  • Fig. 2 den Sichter eingeschaltet in eine Umlauf­mahlanlage;
  • Fig. 3 eine Umlaufmahlanlage mit eingebautem Sichter gemäß einer zweiten Ausführungs­form der Erfindung;
  • Fig. 4 eine Umlaufmahlanlage gemäß einer dritten Ausführungsform der Erfindung.
It shows:
  • Fig. 1 shows schematically in vertical section a first embodiment of the classifier according to the invention;
  • Figure 2 shows the classifier switched into a circulation grinding plant.
  • 3 shows a circulation grinding plant with a built-in sifter according to a second embodiment of the invention;
  • Fig. 4 is a circulation grinding plant according to a third embodiment of the invention.

Der Sichter nach Fig. 1 weist ein Gehäuse (10) auf, das sich im Vertikalschnitt gesehen in seinem unteren Bereich konisch nach unten und in seinem oberen Bereich konisch nach oben ver­jüngt. In das Unterende des Sichtergehäuses (10) ist ein Rohr (11) eingeführt, durch das der Sichtluftstrom (12), beladen mit zu sichtendem Gut, von unten in den Sichter eingeführt wird. Der beladene Sichtluftstrom strömt von unten nach oben durch das Sichtergehäuse (10), wird in dessen oberem Bereich umgelenkt, strömt zwischen über den Umfang verteilte blattförmige gegebe­nenfalls verstellbare Leitelemente (13) hindurch in die ringkanalförmige Sichtzone (14) und in den im Sichtergehäuse rotierbar angeordneten und von oben über eine Welle (15) angetriebenen Sichterrotor bzw. Stabkorb (16) ein, der an seinem Umfang blattförmige Turboelemente (17) trägt und nach unten durch einen Boden abge­schlossen ist.The classifier according to FIG. 1 has a housing (10) which, seen in vertical section, tapers conically downwards in its lower region and conically upwards in its upper region. A pipe (11) is inserted into the lower end of the classifier housing (10), through which the classifying air flow (12), loaded with material to be viewed, is introduced into the classifier from below. The loaded stream of sifted air flows from the bottom upwards through the sifter housing (10), is deflected in its upper region, flows between the circumferential, leaf-shaped, optionally adjustable guide elements (13) into the annular channel-shaped viewing zone (14) and into the rotatably arranged sifter housing and from above via a shaft (15) driven sifting rotor or rod basket (16), which its circumference carries sheet-shaped turbo elements (17) and is closed at the bottom by a floor.

Der erfindungsgemäße Sichter nach Fig. 1 hat in seinem unteren Bereich eine Vorabscheidezone für die groben Grieße, die sich auch infolge der Querschnittserweiterung des Sichtergehäuses (10) im Ringraum (18) zwischen Sichtergehäuse und dem in dieses von unten hineinragenden Rohr (11) sammeln und die über das schräg nach unten geneigte Rohr (19) ausgetragen werden. Dabei können die Betriebsbedingungen des Sichters so eingestellt werden, daß die Korngröße der aus­getragenen groben Grieße (20) z. B. größer 0,5 mm beträgt. Es versteht sich, daß durch die vorabgeschiedenen groben Grieße (20) die Ein­bauten des Sichters nicht belastet werden, wo­durch insgesamt der Verschleiß des erfindungs­gemäßen Sichters gemindert ist.The classifier according to the invention according to FIG. 1 has in its lower region a pre-separation zone for the coarse grains, which also collect as a result of the cross-sectional expansion of the classifier housing (10) in the annular space (18) between the classifier housing and the tube (11) projecting into it from below which are carried out via the obliquely downwardly inclined tube (19). The operating conditions of the classifier can be set so that the grain size of the discharged coarse semolina (20) z. B. is greater than 0.5 mm. It is understood that the built-in sifter is not stressed by the pre-separated coarse gravel (20), whereby the wear of the sifter according to the invention is reduced overall.

Nachdem aus dem Sichter die groben Grieße (20) abgezogen sind, fallen die im Sichtluftstrom verbliebenen feineren Grieße im ringkanalförmi­gen Sichtraum (14) nach unten und sie werden über einen Konus (21), der sich an der Unter­seite der Leitelemente (13) nach unten an­schließt, aufgefangen und über ein schräg nach unten geneigtes Rohr (22) als feinere Grieße (23) mit einer Korngröße von z. B. kleiner 0,5 mm getrennt von den groben Grießen (20) aus dem Sichter abgezogen. Das Feingut wird vom Sicht­luftstrom mitgenommen und mit diesem über ein auf den Stabkorb (16) aufgesetztes nicht mitro­tierendes Feingutaustragsgehäuse (24) aus dem Sichter abgezogen, wie durch Pfeil (25) ange­zeigt.After the coarse semolina (20) has been removed from the classifier, the finer semolina remaining in the air flow falls downward in the annular channel-shaped viewing space (14) and is passed down via a cone (21) which is located on the underside of the guide elements (13) connects, collected and over an obliquely downward inclined tube (22) as finer semolina (23) with a grain size of z. B. less than 0.5 mm separated from the coarse semolina (20) from the classifier. The fine material is entrained by the sifting air flow and withdrawn from the sifter with this via a non-rotating fines discharge housing (24) placed on the rod basket (16), as indicated by arrow (25).

Nach Fig. 2 ist der Sichter der Fig. 1 in eine Umlaufmahlanlage mit Rohrmühle (26) eingeschal­tet, der eine Hochdruck-Walzenpresse (27) vor­geschaltet ist, wobei der Sichteraustrag für die groben Grieße (20) zur Gutaufgabe der Wal­zenpresse und der Sichteraustrag für die feine­ren Grieße (23) zur Gutaufgabe der Rohrmühle (26) zurückgeführt sind. Der Hochdruck-Walzen­presse (27) wird das zu zerkleinernde Aufgabe­gut (28), z. B. nicht vorzerkleinerter Zement­klinker mit einer Korngröße bis beispielsweise 100 mm, über einen Aufgabeschacht (29) aufgege­ben. Die Korngröße eines wesentlichen Teils des Aufgabeguts (28) ist größer als die Weite des engsten Walzenspaltes von z. B. 20 mm zwischen den beiden Preßwalzen, die einen Durchmesser von beispielsweise 900 mm aufweisen können. Die auf das Gut (28, 20) drückende Preßkraft der Walzen der Walzenpresse beträgt mehr als 2 t/cm Walzenlänge, beispielsweise 6 bis 9 t/cm. Das Aufgabegut wird im Spalt zwischen den Walzen durch eine kombinierte Einzelkornzerkleinerung und Gutbettzerkleinerung zerkleinert. Zur Durchführung des letztgenannten Zerkleinerungs­prinzips wird das zu zerkleinernde Aufgabegut über den oberhalb des Walzenspaltes angeordne­ten Aufgabeschacht (29) in so großer Menge dem Walzenspalt der Presse (27) zugeführt, daß das zu zerkleinernde und zwischen die Walzen durch Reibung eingezogene Gut die Walzen auseinander­drückt und die Teilchen des Aufgabeguts sich im Walzenspalt in einer Schüttung bzw. im Kollek­tiv bzw. in einem Gutbett gegenseitig zerquet­schen. Der Zementklinker tritt aus dem Walzen­spalt zerkleinert und teilweise agglomeriert, d. h. zu Schülpen (30) verpreßt aus, deren Anteil an bereits bis zur gewünschten Zement­feinheit reduzierter Partikeln bereits relativ hoch sein kann (ca. 25 % kleiner 90 um). Wäh­rend die Schüttdichte des frischen Mahlgutes (28) 1.600 kg/m³ beträgt, beträgt die Dichte der gepreßten Schülpe (30) ca. 2.400 kg/m³.According to FIG. 2, the classifier of FIG. 1 is switched on in a recirculating grinding plant with a tube mill (26), which is preceded by a high-pressure roller press (27), the classifier discharge for the coarse grains (20) for good feed of the roll press and the classifier discharge for the finer semolina (23) are returned to the tube mill (26). The high-pressure roller press (27) is the feed material to be shredded (28), e.g. B. not pre-shredded cement clinker with a grain size up to 100 mm, for example, via a feed shaft (29). The grain size of an essential part of the feed material (28) is larger than the width of the narrowest nip of z. B. 20 mm between the two press rolls, which may have a diameter of 900 mm, for example. The pressing force of the rollers of the roller press, which presses on the material (28, 20), is more than 2 t / cm roller length, for example 6 to 9 t / cm. The material to be fed is combined in the gap between the rollers by means of combined single grain size reduction and shredded material bed. To carry out the last-mentioned shredding principle, the feed material to be shredded is fed to the roll gap of the press (27) in such a large quantity via the feed shaft (29) arranged above the roll gap that the material to be shredded and drawn in between the rolls by friction pushes the rolls apart and the Particles of the feed material crush each other in the roller gap in a bed or in the collective or in a bed of material. The cement clinker emerges from the roll nip, crushed and partially agglomerated, that is to say pressed into slugs (30), the proportion of particles already reduced to the desired cement fineness can already be relatively high (approx. 25% less than 90 μm). While the bulk density of the fresh ground material (28) is 1,600 kg / m³, the density of the pressed slug (30) is approx. 2,400 kg / m³.

Dadurch, daß in den Aufgabeschacht (29) der Walzenpresse (27) nur die groben Grieße (20) des Sichters (10) rezirkuliert werden, nicht dagegen die feineren Grieße (23), wird die Materialpressung und Entlüftung bei der Gut­bettzerkleinerung im Bereich des engsten Wal­zenspaltes der Walzenpresse nicht behindert. Ganz im Gegenteil können durch die Zumischung nur der groben Grieße (20) zum frischen Aufga­begut (28) die Einzugsbedingungen für das ge­samte Aufgabegut im Walzenspalt der Walzenpres­se (27) bei der Gutbettzerkleinerung sogar ver­bessert werden.The fact that in the feed shaft (29) of the roller press (27) only the coarse size (20) of the classifier (10) are recirculated, but not the finer size (23), the material pressure and ventilation in the material bed shredding is in the narrowest range Roll nip of the roller press is not hindered. On the contrary, by adding only the coarse semolina (20) to the fresh feed material (28), the feed conditions for the entire feed material in the roll nip of the roller press (27) can even be improved in the material bed comminution.

Die Rohrmühle (26) der Fig. 2 ist eine Luft­strommühle mit zentrischer Guteingangsöffnung (31) durch den einen Stirnwandzapfen und zen­trischer Austragsöffnung (32) durch den anderen Stirnwandzapfen. Die Rohrmühle weist vor ihrer Austragsöffnung (32) wie üblich eine Austrags­wand (33) auf, deren Öffnungen nur vorgemahle­nes Gut bestimmter Korngröße hindurchlassen, was durch den Pfeil (34) dargestellt ist. Der Austrag (30) der Walzenpresse (27) ist über eine gegebenenfalls vorhandene nicht darge­stellte Schülpenvorzerkleinerungseinrichtung durch die zentrische Mühlenaustragsöffnung (32) und durch die zentrische Öffnung der Austrags­wand (33) hindurch in den Gutaustrag der Rohr­mühle (26) eingeführt, und zwar im Gegenstrom zum Rohrmühlenaustragsgut, das zusammen mit dem in der Desagglomerier-Kammer (35) desagglome­rierten Walzenpressenaustrag durch periphere Öffnungen derselben Austragswand (33) hindurch als Gutstrom (34) über die Steigleitung (11), deren unterer Teil (11a) an die zentrische Gut­austragsöffnung (32) der Rohrmühle anschließt, mit Hilfe eines Förderluftstromes (36) pneuma­tisch zum Sichter (10) transportiert wird. Das in der Desagglomerier-Kammer (35) der Rohrmühle (26) ankommende Walzenpressen-Austragsgut (30) (Schülpenbruchstücke) ist mit Bezugsziffer (37a) bezeichnet. Diese Schülpenbruchstücke (37a) werden durch reine Umwälzbewegung autogen aufgelöst.The tube mill (26) of FIG. 2 is an airflow mill with a central good inlet opening (31) through one end wall spigot and a central discharge opening (32) through the other end wall spigot. The tube mill has, as usual, a discharge wall (33) in front of its discharge opening (32), the openings of which only allow pre-ground material of a certain grain size to pass through, which is represented by the arrow (34). The discharge (30) of the roller press (27) is introduced into the material discharge of the tube mill (26) through a central scraper pre-shredding device, which may not be present, through the central mill discharge opening (32) and through the central opening of the discharge wall (33), in countercurrent to the tube mill discharge material, which together with the roller press discharge deagglomerated in the deagglomerating chamber (35) through peripheral openings of the same discharge wall (33) as material flow (34) via the riser pipe (11), the lower part (11a) of which passes to the central material discharge opening (32 ) connects to the tube mill, is transported pneumatically to the classifier (10) with the aid of a conveying air flow (36). The roller press discharge material (30) arriving in the deagglomeration chamber (35) of the tube mill (26) (broken fragments) is designated by reference number (37a). These Schülpen Fragments (37a) are dissolved autogenously by pure circulation movement.

Der Sichter (10) sichtet das genügend feine Fertiggut sowohl aus dem desagglomerierten Wal­zenpressenaustragsgut (30) als auch aus dem Mahlprodukt der Rohrmühle (26) aus, und zwar als feine Kornfraktion, die über die Leitung (25) und Staubabscheider (37), z. B. elektro­statischer Staubabscheider abgezogen wird, aus dem das feine Fertiggut (38), im Ausführungs­beispiel der ausreichend fein gemahlene Zement abgezogen wird. Mit (39) ist ein Saugzuggebläse angezeigt. Es besteht auch die Möglichkeit, einen Teilstrom des Walzenpressen-Austragsgutes (30) über die gestrichelt gezeichnete Verbin­dung (40) in den Aufgabeschacht (29) der Wal­zenpresse (27) zu rezirkulieren.The classifier (10) sifts the sufficiently fine finished product both from the deagglomerated roller press discharge material (30) and from the grinding product of the tube mill (26), namely as a fine grain fraction, which via the line (25) and dust separator (37), e.g. . B. electrostatic dust collector is withdrawn, from which the fine finished product (38), in the exemplary embodiment of the sufficiently finely ground cement, is withdrawn. An induced draft fan is indicated by (39). There is also the possibility of recirculating a partial flow of the roller press material to be discharged (30) via the connection (40) shown in dashed lines into the feed shaft (29) of the roller press (27).

Zur Realisierung der Umlaufmahlanlage der Fig. 2 unter Einsatz des erfindungsgemäßen Sichters kann eine ursprünglich vorhanden gewesene Rohr­mühle eingesetzt werden, ohne daß diese umge­baut werden müßte. Als einzige Umbau- bzw. Er­ gänzungsmaßnahme kann mit Vorteil in die Rohr­mühle (26) mit Abstand zur ohnehin vorhandenen Austragswand (33) eine perforierte Trennwand (41) eingebaut werden, welche die die Mahlkör­per (42) enthaltende eigentliche Mahlkammer von der zwischen Austragswand (33) und Trennwand (41) gelegenen Desagglomerier-Kammer (35) trennt, sofern die Rohrmühle nicht bereits ur­sprünglich schon eine Zweikammermühle mit Trennwand gewesen ist. Die Rohrmühle kann auch ein Gutausfallgehäuse aufweisen mit einem Becherwerk zum Transport des Mahlgutes zum Sichter.2 using the classifier according to the invention, an originally existing tube mill can be used without having to be converted. As the only remodeling or Er as a supplementary measure, a perforated partition wall (41) can advantageously be installed in the tube mill (26) at a distance from the discharge wall (33) which is present anyway, which separates the actual grinding chamber containing the grinding media (42) from the one between the discharge wall (33) and the partition wall (41) located disagglomerating chamber (35), unless the tube mill was already originally a two-chamber mill with a partition. The tube mill can also have a material failure housing with a bucket elevator for transporting the ground material to the classifier.

Ist der Luftstrom (36) ein Heißgasstrom, so kann die Umlaufmahlanlage der Fig. 2 als Mahl­trocknungsanlage zur Mahlung und Trocknung von feuchtem Gut verwendet werden, z. B. von feuch­tem Ausgangsmaterial zur Herstellung von Zementrohmehl. Dann dient die Steigleitung (11) zwischen Mühle (26) und Sichter (10) als Strom­trockner. Es besteht die Möglichkeit, aus dem Trocknungsgasstrom (43) nach dem Saugzuggebläse (39) einen Teilstrom (44) abzuzweigen und die­sen über die Leitung (45) dem frischen Heißgas­strom (36) zuzumischen und/oder über Leitung (46) unten in den Stromstrockner (11) einzufüh­ren. Statt der Rohrmühle (26) wäre auch eine andere Feinzerkleinerungseinrichtung denkbar.If the air stream (36) is a hot gas stream, the circulation grinding plant of FIG. 2 can be used as a grinding drying plant for grinding and drying moist material, for. B. from moist starting material for the production of raw cement meal. Then the riser (11) between the mill (26) and classifier (10) serves as a current dryer. It is possible to branch off a partial flow (44) from the drying gas flow (43) after the induced draft fan (39) and to add this to the fresh hot gas flow (36) via line (45) and / or via line (46) below into the flow dryer (11). Instead of the tube mill (26), another fine comminution device would also be conceivable.

Fig. 3 zeigt das Fließbild einer Mahltrock­nungsanlage zur Mahlung und Trocknung von feuchtem Ausgangsmaterial zur Herstellung von Zementrohmehl. Das Ausgangsmaterial (28) wird über den Aufgabeschacht (29) der Hochdruck-Wal­zenpresse (27) aufgegeben und dort wie beim Ausführungsbeispiel der Fig. 2 zerkleinert. Die sich bildenden Schülpen (30) werden über eineFig. 3 shows the flow diagram of a grinding drying plant for grinding and drying of moist starting material for the production of raw cement meal. The starting material (28) is fed through the feed shaft (29) of the high-pressure roller press (27) and comminuted there, as in the exemplary embodiment in FIG. 2. The slugs (30) that are formed are placed over a

Fördereinrichtung (47) sowie über eine Materi­alschleuse (48) in den Guteinlauf (49) einer Prallhammermühle (50) mit geschlossenem Boden eingebracht und dort desagglomeriert. An den Guteinlauf (49) des Desagglomerators (50) ist eine gestrichelt gezeichnete Heißgasleitung (51) angeschlossen. Als Heißgas kann Abgas eines Vorwärmers für Zementrohmehl einer Zementklinker-Brennanlage, heiße Abluft eines Zementklinkerkühlers oder/und Heißgas eines sonstigen Heißgaserzeugers verwendet werden. An den Gutaustrag des Desagglomerators (50) ist die als Stromtrockner ausgebildete Steigleitung (11, 12) angeschlossen, in der das Gut getrock­net wird und die zum Sichter (10) führt, wobei der Sichteraustrag (19) für die groben Grieße (20) über einen Förderer (52) zur Gutaufgabe (29) der Walzenpresse (27) und der Sichteraus­trag (22) für die feineren Grieße (23) zur Gut­aufgabe einer Rohrmühle (26) geführt sind. Die feineren Grieße (23) werden in die Rohrmühle (26) zusammen mit einem Heißgasstrom (53) ein­ geführt, der von der Heißgasleitung (51) abge­zweigt sein kann, z. B. aus heißem Rauchgas oder heißem Abgas einer Zementklinker-Brennan­lage besteht und insofern Inertgaseigenschaft aufweist. Dies ist von Bedeutung, wenn das in der Mahltrocknungsanlage nach Fig. 3 zu behan­delnde feuchte Aufgabegut (28) nicht feuchte Zementrohstoffe sind, sondern z. B. feuchte Kohle ist. Nach der Behandlung in der Rohrmühle (26) wird das Gut über Leitung (54) in die zum Sichter (10) führende Steigleitung (11, 12) eingeführt. Die Feingutaustragsleitung (25) des Sichters (10) führt zum Abscheider (37) wie Filter, Abscheidezyklon oder dergleichen, der über einen Förderer (55), z. B. Schneckenför­derer das Feingut als Fertiggut (38), z. B. fertig getrocknetes und gemahlenes Zementroh­mehl bzw. auch fertig getrocknete und gemahlene Kohle, aus dem Sichtgasstrom bzw. Trocknungs­gasstrom (43) abscheidet. Die Abgasleitung (43) steht nach Abscheidung des Fertiggutes über die Zweigleitung (44, 45) mit der an den Guteinlauf (49) des Desagglomerators (50) angeschlossenen Heißgasleitung (51) und/oder über eine Zweig­leitung (46) mit der an dem Gutaustrag des Des­agglomerators (50) angeschlossenen Steigleitung (11, 12) in Verbindung.Conveying device (47) and a material sluice (48) into the material inlet (49) of an impact hammer mill (50) with a closed bottom and disagglomerated there. A hot gas line (51), shown in dashed lines, is connected to the inlet (49) of the deagglomerator (50). Exhaust gas from a preheater for cement raw meal from a cement clinker combustion plant, hot exhaust air from a cement clinker cooler and / or hot gas from another hot gas generator can be used as hot gas. Connected to the discharge of the deagglomerator (50) is the riser (11, 12) designed as a current dryer, in which the material is dried and which leads to the sifter (10), the sift discharge (19) for the coarse grains (20) a conveyor (52) for the feed (29) of the roller press (27) and the sifter discharge (22) for the finer grains (23) for the feed of a tube mill (26). The finer semolina (23) are introduced into the tube mill (26) together with a hot gas stream (53) performed, which can be branched from the hot gas line (51), for. B. consists of hot flue gas or hot exhaust gas from a cement clinker combustion plant and, in so far, has inert gas properties. This is important if the moist feed material (28) to be treated in the mill-drying system according to FIG. 3 is not moist cement raw materials, but rather e.g. B. is wet coal. After the treatment in the tube mill (26), the material is introduced via line (54) into the riser (11, 12) leading to the classifier (10). The fine material discharge line (25) of the classifier (10) leads to the separator (37) such as a filter, separating cyclone or the like, which is conveyed via a conveyor (55), e.g. B. screw conveyor the fines as finished goods (38), z. B. completely dried and ground cement raw meal or also completely dried and ground coal, from the classifying gas stream or drying gas stream (43). After the finished product has been separated, the exhaust gas line (43) is connected via the branch line (44, 45) to the hot gas line (51) connected to the product inlet (49) of the deagglomerator (50) and / or via a branch line (46) to the product discharge of the deagglomerator (50) connected riser (11, 12) in connection.

Während die Figuren 1 bis 3 einen Sichter zei­gen, dem das Aufgabegut zusammen mit der Sicht­ luft zugeführt wird, zeigt Fig. 4 einen Sichter (10), dem das Aufgabegut getrennt von der Sichtluft zugeführt wird. Dieser Sichter (10) ist ebenfalls in eine Umlaufmahlanlage mit Rohrmühle (26) und Hochdruck-Walzenpresse (27) eingeschaltet. Auch bei dieser Umlaufmahlanlage werden die Austragsleitung (20) des Sichters (10) für die groben Grieße zur Gutaufgabe der Hochdruck-Walzenpresse (27) und die Austrags­leitung (23) für die feineren Grieße zum Gut­einlauf der Rohrmühle (26) rezirkuliert. Die Mühle (26) kann im offenen Durchlauf betrieben werden. Das Mühlenaustragsgut wird über Leitung (56) auf einen innerhalb des Sichters (10) rotierenden Streuteller aufgegeben. Mit (12a) ist der Sichtlufteintritt in den Sichter und mit (25) ist der Abzug des mit dem Feingut be­ladenen Sichtluftstroms aus dem Sichter (10) angezeigt. Die bei der Beschreibung der Figuren 1, 2 und 3 geltend gemachten Vorteile der Er­findung gelten auch für das Ausführungsbeispiel der Fig. 4.While Figures 1 to 3 show a sifter, the feed material along with the view 4 shows a sifter (10), to which the feed material is fed separately from the classifying air. This classifier (10) is also switched into a circulation grinding plant with a tube mill (26) and high-pressure roller press (27). In this rotary grinding plant, the discharge line (20) of the classifier (10) for the coarse semolina to feed the high-pressure roller press (27) and the discharge line (23) for the finer semolina to the material inlet of the tube mill (26) are recirculated. The mill (26) can be operated in an open pass. The material to be discharged from the mill is fed via line (56) to a spreading disc rotating within the classifier (10). With (12a) the sight air entry into the classifier and with (25) the withdrawal of the fine air-laden sight air flow from the classifier (10) is indicated. The advantages of the invention claimed in the description of FIGS. 1, 2 and 3 also apply to the exemplary embodiment in FIG. 4.

Claims (7)

1. Sichter zum Sichten von körnigem Gut, mit einem Sichtlufteintritt und Eintritt für das zu sichtende Gut und mit einem Sicht­luft- und Feingutaustritt sowie mit einem Grobgutaustrag zum Austrag der Grieße, ge­kennzeichnet durch wenigstens zwei vonein­ander getrennte Grießeaustragsöffnungen, nämlich eine Austragsöffnung (19, 20) für grobe Grieße und eine Austragsöffnung (22, 23) für feinere Grieße.1. sifter for sifting of granular material, with a view of the air inlet and inlet for the material to be classified and a Sichtluft- and fine material outlet as well as a coarse material outlet for discharging the tailings, characterized by at least two separate Grießeaustragsöffnungen, namely, a discharge opening (19, 20 ) for coarse semolina and a discharge opening (22, 23) for finer semolina. 2. Sichter nach Anspruch 1, gekennzeichnet durch ein Sichtergehäuse (10), in dessen unterem Bereich die Sichtlufteintrittsöff­nung (11) und die Austragsöffnung (18, 19) für die groben Grieße (20) und dessen obe­rem Bereich ein rotierbar angeordneter Stabkorb (16) mit Turboelementen (17) ange­ordnet sind, die von über den Umfang ver­teilt angeordneten Leitelementen (13) umge­ben sind, deren Unterseite über einen Konus (21) bzw. eine nach unten geneigte Leitung mit der Austragsöffnung (22) für die feine­ren Grieße (23) verbunden ist, und daß oberhalb des Stabkorbes (16) im Sichterge­häuse die Austragsöffnung für die Sichtluft und für das Feingut (25) angeordnet ist.2. Sifter according to claim 1, characterized by a sifter housing (10), in the lower area of the visible air inlet opening (11) and the discharge opening (18, 19) for the coarse gravel (20) and the upper area of a rotatably arranged rod basket (16) are arranged with turbo elements (17) which are surrounded by guide elements (13) arranged distributed over the circumference, the underside of which is via a cone (21) or a downwardly inclined line with the discharge opening (22) for the finer sizes (23) is connected, and that above the rod basket (16) in the classifier housing, the discharge opening for the classifying air and for the fine material (25) is arranged. 3. Sichter nach den Ansprüchen 1 oder 2, da­durch gekennzeichnet, daß der Sichter in eine Umlaufmahlanlage mit Rohrmühle (26) eingeschaltet ist, der eine Hochdruck-Wal­zenpresse (27) vorgeschaltet ist, wobei der Sichteraustrag für die groben Grieße (20) zur Gutaufgabe der Walzenpresse (27) und der Sichteraustrag für die feineren Grieße (23) zur Gutaufgabe der Rohrmühle (26) zu­rückgeführt sind.3. Sifter according to claims 1 or 2, characterized in that the sifter is switched on in a circulating grinding plant with a tube mill (26), which is preceded by a high-pressure roller press (27), the sifter discharge for the coarse grains (20) for the good task the roller press (27) and the sifter discharge for the finer semolina (23) are fed back to the tube mill (26). 4. Sichter nach Anspruch 3, dadurch gekenn­zeichnet, daß am Gutauslauf der Rohrmühle (26) eine mit dieser mitrotierende Desagg­lomerier-Trommel (35) angeordnet ist, deren Guteinlauf mit dem Austrag (30) der Hoch­druck-Walzenpresse (27) und deren Gutaus­lauf mit dem Sichter (10) in Verbindung stehen, dessen Austragsleitung (22, 23) für die feineren Grieße zum Guteinlauf der Rohrmühle (26) führt.4. Sifter according to claim 3, characterized in that a co-rotating disagglomerating drum (35) is arranged at the material outlet of the tube mill (26), the material inlet with the discharge (30) of the high-pressure roller press (27) and its material outlet with the classifier (10) is connected, the discharge line (22, 23) for the finer greens leading to the inlet of the tube mill (26). 5. Sichter nach Anspruch 4, dadurch gekenn­zeichnet, daß in der Rohrmühle (26) eine perforierte Irennwand (41) angeordnet ist, die eine Mahlkörper enthaltende Mahlkammer von einer ohne Mahlkörper ausgestatteten Desagglomerier-Kammer (35) trennt.5. Sifter according to claim 4, characterized in that a perforated wall (41) is arranged in the tube mill (26) which separates a grinding chamber containing grinding media from a deagglomeration chamber (35) equipped without grinding media. 6. Sichter nach Anspruch 1, dadurch gekenn­zeichnet, daß der Sichter ein dynamischer oder statischer Sichter ist.6. Sifter according to claim 1, characterized in that the sifter is a dynamic or static sifter. 7. Mahlanlage mit Einschaltung eines Sichters nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Austrag (19) des Sichters (10) für die groben Grieße (20) mit der Gutaufgabe (29) der Hochdruck-Wal­zenpresse (27) und der Austrag (22) des Sichters für die feineren Grieße (23) mit der Gutaufgabe der Rohrmühle (26) in Ver­bindung stehen (Figuren 2, 3 und 4).7. Grinding plant with a classifier according to one of claims 1 to 6, characterized in that the discharge (19) of the classifier (10) for the coarse gravel (20) with the good job (29) of the high-pressure roller press (27) and the discharge (22) of the classifier for the finer semolina (23) is related to the task of the tube mill (26) (FIGS. 2, 3 and 4).
EP90100132A 1989-02-20 1990-01-04 Air classifier for sifting a granular material, and grinding plant employing such a classifier Expired - Lifetime EP0384101B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9007802U DE9007802U1 (en) 1989-02-20 1990-01-04 Circulating grinding plant

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3905123A DE3905123A1 (en) 1989-02-20 1989-02-20 Sifter for sifting granular material and milling system with the activation of such a sifter
DE3905123 1989-02-20

Publications (2)

Publication Number Publication Date
EP0384101A1 true EP0384101A1 (en) 1990-08-29
EP0384101B1 EP0384101B1 (en) 1995-10-11

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EP90100132A Expired - Lifetime EP0384101B1 (en) 1989-02-20 1990-01-04 Air classifier for sifting a granular material, and grinding plant employing such a classifier

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Country Link
US (1) US5005770A (en)
EP (1) EP0384101B1 (en)
AT (1) ATE128889T1 (en)
DE (4) DE3905123A1 (en)
DK (1) DK0384101T3 (en)
ES (1) ES2077590T3 (en)

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EP0829303A1 (en) * 1996-09-13 1998-03-18 DEUTZ Aktiengesellschaft Ring roller mill for pressure milling of granular material
CN1056787C (en) * 1993-08-07 2000-09-27 霍索卡瓦阿尔彼股份公司及两合公司 Method and device for separation of a fine grained solid matter into two particle fractions
WO2016062428A1 (en) * 2014-10-22 2016-04-28 Thyssenkrupp Industrial Solutions Ag Grinding system for grinding a material to be ground, and method for grinding a material to be ground
RU2623761C2 (en) * 2015-02-16 2017-06-29 Министерство сельского хозяйства Российской Федерации Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Вятская государственная сельскохозяйственная академия" (ФГБОУ ВПО ВГСХА) Centrifugal-pneumatic separator of grain material

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FR2693667A1 (en) * 1992-07-18 1994-01-21 Kloeckner Humboldt Deutz Ag Screener for screening grain products and installation equipped with such a screener.
CN1056787C (en) * 1993-08-07 2000-09-27 霍索卡瓦阿尔彼股份公司及两合公司 Method and device for separation of a fine grained solid matter into two particle fractions
EP0829303A1 (en) * 1996-09-13 1998-03-18 DEUTZ Aktiengesellschaft Ring roller mill for pressure milling of granular material
WO2016062428A1 (en) * 2014-10-22 2016-04-28 Thyssenkrupp Industrial Solutions Ag Grinding system for grinding a material to be ground, and method for grinding a material to be ground
RU2623761C2 (en) * 2015-02-16 2017-06-29 Министерство сельского хозяйства Российской Федерации Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Вятская государственная сельскохозяйственная академия" (ФГБОУ ВПО ВГСХА) Centrifugal-pneumatic separator of grain material

Also Published As

Publication number Publication date
ES2077590T3 (en) 1995-12-01
EP0384101B1 (en) 1995-10-11
DE9007802U1 (en) 1996-08-01
DE3905123A1 (en) 1990-08-23
DE59009754D1 (en) 1995-11-16
US5005770A (en) 1991-04-09
ATE128889T1 (en) 1995-10-15
DK0384101T3 (en) 1996-03-04
DE8916267U1 (en) 1996-08-08

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