EP0443382B1 - Method for cleaning the filtration element of a filter centrifuge - Google Patents
Method for cleaning the filtration element of a filter centrifuge Download PDFInfo
- Publication number
- EP0443382B1 EP0443382B1 EP91101733A EP91101733A EP0443382B1 EP 0443382 B1 EP0443382 B1 EP 0443382B1 EP 91101733 A EP91101733 A EP 91101733A EP 91101733 A EP91101733 A EP 91101733A EP 0443382 B1 EP0443382 B1 EP 0443382B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- drum
- centrifuge
- liquid
- base layer
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B15/00—Other accessories for centrifuges
- B04B15/06—Other accessories for centrifuges for cleaning bowls, filters, sieves, inserts, or the like
Definitions
- the invention relates to a method for cleaning the filter medium of a filter centrifuge according to the preamble of patent claim 1.
- the invention is therefore based on the object of specifying a method of the aforementioned type in which a particularly thorough cleaning of the filter medium from product residues can be achieved with small amounts of liquid and in a short time.
- the lower amount of liquid required according to the invention and the lower liquid content of the detached base layer solid constituents mean that the detachment and regeneration of the base layer requires less time and thus more time is available for the actual operation of the centrifuge.
- the invention is based on the knowledge that on the one hand the adhesive effect of the solid components among one another and on the filter medium is reduced by the saturating penetration and flooding of the base layer with liquid and on the other hand due to the inertia when the drum brakes strongly between the filter medium on the one hand and the solid residues as well as the liquid on the other hand, shear forces are generated, which cause a largely complete detachment of the base layer from the filter medium.
- Fig. 1 shows a filter centrifuge of the type with a siphon or backwashing device.
- a drum 3 is mounted in a housing 1 with a horizontal drum axis of rotation 2.
- the drum consists of a drum base 4, a solid casing 5, a ring cup 6, a rim 7 and a filter medium 8.
- the solid shell 5 and the filter medium 8 enclose a filtrate collecting space 9, which is connected to the ring cup via a passage opening 10 arranged in the drum base 4 6 communicates.
- a liquid supply pipe 11 and a peeling pipe 11a open into the ring cup 6.
- a discharge device 14 Extending into the drum interior 12 is a discharge device 14 which can be pivoted about a pivot axis 13 and carries a peeling knife 15 which extends over the axial length of the drum 3.
- the peeling knife 15 is followed by a discharge hopper 16 which opens into a discharge pipe 17 equipped with a discharge screw (not shown).
- a suspension feed pipe 18 also projects into the drum interior 12.
- the filter medium 8 there is a base layer 19 made of solid material, the thickness of which is determined by the radially outermost pivoting position of the peeling knife 15 during the discharge process. In the position shown, the peeling knife 15 is in a position pivoted back again from the surface of the base layer.
- suspension is filled into the drum 3 via the suspension feed tube 18, whereupon the solid layer settles on the filter medium 8 during centrifugation and the filtrate flows through the filter medium 8 via the filtrate collecting space 9 and the passage opening 10 into the ring cup 6 where the filtrate can be completely drawn off by means of the peeling tube 11a which can be swiveled to the bottom of the ring cup.
- the solid layer deposited on the filter medium 8 can then be peeled off by swiveling in the peeling knife 15 and discharged via the discharge funnel 16 and the discharge tube 17, the base layer 19 remaining on the filter medium 8, which in particular compresses after repeated peeling processes while increasing the filtration resistance.
- liquid is poured into the ring cup 6 via the liquid feed tube 16, which liquid enters the filtrate collecting space 9 through the passage opening 10 and then the filter medium 8 and the base layer radially from the outside flows through until the base layer is flooded.
- the drum speed is then reduced with strong negative acceleration, so that the liquid-saturated base layer 19 detaches from the filter medium 8 with all solid particles and slides over the filter medium 8.
- the intensity of the cleaning effect depends on the rotation difference between the liquid loaded with solids in the base layer and the drum.
- product residues that have become stuck under the filter medium or on its support structure (not shown) or on the inner wall of the full casing 5 can also be washed away and drawn off from the ring cup 6 together with the liquid with the peeling tube 11a.
- the drum speed is determined by how strongly the residues of the base layer adhere to the filter medium.
- the liquid loaded with the solids of the base layer can be discharged in such a way that the solid-liquid mixture collecting in the lower region when the drum speed slows down is suctioned off.
- the procedure according to claim 4 is more rational, in which suspension is again filled onto the mixture consisting of solids of the base layer and the liquid, whereupon a normal operating cycle for dewatering a batch of suspension is started.
- the emptying process is particularly simple for centrifuges with a vertical axis of rotation and bottom emptying, in which the mixture consisting of solids of the base layer and liquid is used after braking the drum slowly sinks down and falls out of the drum.
- FIG. 2 shows a filter centrifuge of simple design without a siphon or backwashing device, but the components which correspond to the embodiment according to FIG. 1 are provided with the same reference numerals.
- the liquid supply pipe 20 does not open into a ring cup, but into the drum interior 12.
- the liquid is applied to the base layer 19 from the inside via the liquid supply pipe 20, the speed of the drum 3 and the number of previous peeling processes in accordance with the measures according to claim 2 is determined.
- the procedure for completely cleaning the filter medium from constituents of the base layer is to be carried out as in the filter centrifuge described with the embodiment according to FIG. 1 with a siphon or backwashing drum.
- the mixture consisting of base layer constituents and liquid can be discharged, whereby instead of discharging, a fresh supply of suspension can be started for a subsequent normal functional cycle for dewatering a batch of suspension.
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- Centrifugal Separators (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Reinigen des Filtermittels einer Filterzentrifuge gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for cleaning the filter medium of a filter centrifuge according to the preamble of
Aus der FR-A-23 80 820 ist ein Verfahren bekannt, bei dem der Ablauf des Filtratsammelraumes geschlossen oder gedrosselt wird, bis die Flüssigkeit des Filtratsammelraumes bei rotiernder Schleudertrommel mindestens einen Teil der Filterschicht erreicht. Die durch die Filterschicht gedrückte Flüssigkeit führt zu einer Aufschwemmung und Lockerung und damit zu einer Regeneration der Grundschicht. Voraussetzung hierfür ist allerdings, daß die Grundschicht nicht zu sehr an der Siebfläche haftet und noch so porös ist, daß sie von der Flüssigkeit durchdrungen werden kann. Zur Ablösung einer Grundschicht, die sich nach mehreren Abschälvorgängen stark verdichtet und fest in der Siebfläche verankert hat, ist dieses Verfahren jedoch nicht immer geeignet und erfordert die Zufuhr einer großen Flüssigkeitsmenge, wodurch zum einen das Ablösen der Grundschicht eine lange Zeit erfordert und zum anderen das Regenerat mit einer großen Flüssigkeitsmenge durchsetzt ist.From FR-A-23 80 820 a method is known in which the outlet of the filtrate collecting space is closed or throttled until the liquid of the filtrate collecting space reaches at least part of the filter layer when the centrifugal drum is rotating. The liquid pressed through the filter layer leads to a suspension and loosening and thus to a regeneration of the base layer. The prerequisite for this, however, is that the base layer does not adhere too strongly to the screen surface and is still so porous that the liquid can penetrate it. However, this method is not always suitable for detaching a base layer that has become densely compacted and firmly anchored in the sieve surface after several peeling processes and requires the supply of a large amount of liquid, which on the one hand takes a long time to detach the base layer and on the other hand it does this Regenerate is interspersed with a large amount of liquid.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der vorgenannten Art anzugeben, bei dem mit geringen Flüssigkeitsmengen und in kurzer Zeit eine besonders gründliche Reinigung des Filtermittels von Prdouktresten erzielt werden kann.The invention is therefore based on the object of specifying a method of the aforementioned type in which a particularly thorough cleaning of the filter medium from product residues can be achieved with small amounts of liquid and in a short time.
Die Aufgabe wird durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst. Der Unteranspruch betrifft eine vorteilhafte Ausgestaltung der Erfindung.The object is achieved by the characterizing features of
Die nach der Erfindung geringere erforderliche Flüssigkeitsmenge und der geringere Flüssigkeitsgehalt der abgelösten Grundschicht-Feststoffbestandteile führen dazu, daß die Ablösung und Regenerierung der Grundschicht einen geringeren Zeitaufwand erfordert und somit zum eigentlichen Betrieb der Zentrifuge mehr Zeit zur Verfügung steht.The lower amount of liquid required according to the invention and the lower liquid content of the detached base layer solid constituents mean that the detachment and regeneration of the base layer requires less time and thus more time is available for the actual operation of the centrifuge.
Die Erfindung geht dabei von der Erkenntnis aus, daß sich zum einen durch die sättigende Durchsetzung und Überflutung der Grundschicht mit Flüssigkeit die Haftwirkung der Feststoffbestandteile untereinander und am Filtermittel reduziert und zum anderen aufgrund der Massenträgheit beim starken Abbremsen der Trommel zwischen dem Filtermittel einerseits und den Feststoffresten sowie der Flüssigkeit andererseits, Scherkräfte erzeugt werden, die ein weitestgehend vollständiges Ablösen der Grundschicht vom Filtermittel bewirken.The invention is based on the knowledge that on the one hand the adhesive effect of the solid components among one another and on the filter medium is reduced by the saturating penetration and flooding of the base layer with liquid and on the other hand due to the inertia when the drum brakes strongly between the filter medium on the one hand and the solid residues as well as the liquid on the other hand, shear forces are generated, which cause a largely complete detachment of the base layer from the filter medium.
Ausführungsformen der Erfindung werden anhand der Zeichnung erläutert; es zeigen:
- Fig. 1
- in schematischer Darstellung eine Filterzentrifuge mit einem das Filtermittel umgebenden Vollmantel und einer Ringtasse und
- Fig. 2
- in schematischer Darstellung eine Filterzentrifuge mit einfachem Aufbau
- Fig. 1
- a schematic representation of a filter centrifuge with a solid jacket surrounding the filter medium and a ring cup and
- Fig. 2
- a filter centrifuge with a simple structure in a schematic representation
Die Fig. 1 zeigt eine Filterzentrifuge der Bauart mit einer Siphon- oder Rückspüleinrichtung. In einem Gehäuse 1 ist mit horizontaler Trommel-Drehachse 2 eine Trommel 3 gelagert. Die Trommel besteht dabei aus einem Trommelboden 4, einem Vollmantel 5, einer Ringtasse 6, einem Bordring 7 sowie einem Filtermittel 8. Der Vollmantel 5 und das Filtermittel 8 schließen einen Filtratsammelraum 9 ein, der über eine im Trommelboden 4 angeordnete Durchgangsöffnung 10 mit der Ringtasse 6 in Verbindung steht. In die Ringtasse 6 mündet ein Flüssigkeitszufuhrrohr 11 sowie ein Schälrohr 11a.Fig. 1 shows a filter centrifuge of the type with a siphon or backwashing device. A drum 3 is mounted in a
In den Trommelinnenraum 12 ragt eine um eine Schwenkachse 13 schwenkbare Austragsvorrichtung 14, die ein über die axiale Länge der Trommel 3 sich erstreckendes Schälmesser 15 trägt. An das Schälmesser 15 schließt sich ein Austragstrichter 16 an, der in ein mit einer Austragschnecke (nicht dargestellt) bestücktes Austragrohr 17 mündet. In den Trommelinnnenraum 12 ragt ferner ein Suspensionszufuhrrohr 18.Extending into the
Auf dem Filtermittel 8 befindet sich eine Grundschicht 19 aus Feststoffmaterial, deren Stärke sich durch die radial äußerste Schwenkstellung des Schälmessers 15 beim Austragvorgang bestimmt. In der dargestellten Stellung befindet sich das Schälmesser 15 in einer von der Grundschichtoberfläche wieder zurückgeschwenkten Stellung.On the
Im Betrieb der Filterzentrifuge wird über das Suspensionszufuhrrohr 18 Suspension in die Trommel 3 gefüllt, worauf sich während des zentrifugierens auf dem Filtermittel 8 die Feststoffschicht absetzt und das Filtrat durch das Filtermittel 8 über den Filtratsammelraum 9 und die Durchgangsöffnung 10 in die Ringtasse 6 strömt, von wo das Filtrat mittels des bis zum Grund der Ringtasse einschwenkbaren Schälrohres 11a vollständig abgezogen werden kann. Die sich auf dem Filtermittel 8 abgesetzte Feststoffschicht kann anschließend durch Einschwenken des Schälmessers 15 abgeschält und über den Austragtrichter 16 und das Austragrohr 17 ausgetragen werden, wobei auf dem Filtermittel 8 die Grundschicht 19 verbleibt, die sich insbesondere nach mehrmaligen Schälvorgängen unter Erhöhung des Filtrationswiderstandes verdichtet.During operation of the filter centrifuge, suspension is filled into the drum 3 via the
In der Betriebsphase, in der die Grundschicht 19 vom Filtermittel 8 entfernt werden soll, wird über das Flüssigkeitszufuhrrohr 16 in die Ringtasse 6 Flüssigkeit eingefüllt, die über die Durchgangsöffnung 10 in den Filtratsammelraum 9 gelangt und sodann das Filtermittel 8 und die Grundschicht radial von außen nach innen durchströmt, bis die Grundschicht überflutet ist.In the operating phase, in which the
Die Trommeldrehzahl wird anschließend mit starker negativer Beschleunigung reduziert, so daß sich die mit Flüssigkeit gesättigte Grundschicht 19 vom Filtermittel 8 mit allen Feststoffpartikeln löst und über das Filtermittel 8 gleitet. Die Intensität der Reinigungswirkung hängt dabei von der Rotationsdifferenz zwischen der mit Feststoffen der Grundschicht beladenen Flüssigkeit und der Trommel ab.The drum speed is then reduced with strong negative acceleration, so that the liquid-
Bei diesem Vorgang können auch Produktreste, die sich unter dem Filtermittel oder an dessen Stützstruktur (nicht dargestellt) oder an der Innenwandung des Vollmantels 5 festgesetzt haben, weggespült und zusammen mit der Flüssigkeit mit dem Schälrohr 11a aus der Ringtasse 6 abgezogen werden.During this process, product residues that have become stuck under the filter medium or on its support structure (not shown) or on the inner wall of the
Während des Rückspülens, bzw. während der überflutung der Grundschicht mit Flüssigkeit bestimmt sich die Trommeldrehzahl danach, wie stark die Rückstände der Grundschicht auf dem Filtermittel haften.During backwashing or during the flooding of the base layer with liquid, the drum speed is determined by how strongly the residues of the base layer adhere to the filter medium.
In hartnäckigen Fällen kann das erfindungsgemäße Verfahren wiederholt werden.In stubborn cases, the method according to the invention can be repeated.
Der Austrag der mit den Feststoffen der Grundschicht beladenen Flüssigkeit kann in der Weise erfolgen, daß das bei verlangsamter Trommeldrehzahl sich im unteren Bereich sammelnde Feststoff-Flüssigkeitsgemisch abgesaugt wird. Rationeller ist jedoch die Verfahrensweise nach Patentanspruch 4, bei dem auf das aus Feststoffen der Grundschicht und der Flüssigkeit bestehende Gemisch erneut Suspension gefüllt wird, worauf ein normaler Funktionszyklus zum Entwässern einer Charge von Suspension in Gang gesetzt wird.The liquid loaded with the solids of the base layer can be discharged in such a way that the solid-liquid mixture collecting in the lower region when the drum speed slows down is suctioned off. However, the procedure according to claim 4 is more rational, in which suspension is again filled onto the mixture consisting of solids of the base layer and the liquid, whereupon a normal operating cycle for dewatering a batch of suspension is started.
In besonders einfacher Weise gestaltet sich der Entleerungsvorgang bei Zentrifugen mit vertikaler Drehachse und Untenentleerung, bei der das aus Feststoffen der Grundschicht und aus Flüssigkeit bestehende Gemisch nach dem Abbremsen der Trommel langsam nach unten sinkt und aus der Trommel fällt.The emptying process is particularly simple for centrifuges with a vertical axis of rotation and bottom emptying, in which the mixture consisting of solids of the base layer and liquid is used after braking the drum slowly sinks down and falls out of the drum.
Die Fig. 2 zeigt eine Filterzentrifuge einfacher Bauart ohne Siphon- oder Rückspüleinrichtung, wobei aber die Bauteile, die der Ausführungsform nach Fig. 1 entsprechen, mit den gleichen Bezugszeichen versehen sind. In Abweichung zu der Ausführungsform nach Fig. 1 mündet das Flüssigkeitszufuhrrohr 20 nicht in eine Ringtasse, sondern in den Trommelinnenraum 12.2 shows a filter centrifuge of simple design without a siphon or backwashing device, but the components which correspond to the embodiment according to FIG. 1 are provided with the same reference numerals. In a departure from the embodiment according to FIG. 1, the
In der Betriebsphase, in der die Grundschicht 19 vom Filtermittel 8 entfernt werden soll, wird die Flüssigkeit über das Flüssigkeitszufuhrrohr 20 von innen auf die Grundschicht 19 aufgegeben, wobei die Drehzahl der Trommel 3 und die Anzahl der vorangegangenen Schälvorgänge nach Maßgabe der Maßnahmen nach Patentanspruch 2 bestimmt wird. Nach der sättigenden Beaufschlagung und Überflutung der Grundschicht 19 mit Flüssigkeit ist das Vefahren zur vollständigen Reinigung des Filtermittels von Bestandteilen der Grundschicht wie bei der zu der Ausführungsform nach Fig 1 beschriebenen Filterzentrifuge mit Siphon - oder Rückspültrommel durchzuführen.In the operating phase, in which the
In zur Ausführungsform nach Fig. 1 entsprechender Weise kann das Austragen des aus Grundschichtbestandteilen und Flüssigkeit bestehenden Gemisches erfolgen, wobei anstelle des Austragens auch eine erneute Zuführung von Suspension für einen nachfolgenden normalen Funktionszyklus zum Entwässern einer Charge von Suspension in Gang gesetzt werden kann.In a manner corresponding to the embodiment according to FIG. 1, the mixture consisting of base layer constituents and liquid can be discharged, whereby instead of discharging, a fresh supply of suspension can be started for a subsequent normal functional cycle for dewatering a batch of suspension.
Claims (2)
- A method of cleaning the filter medium of a filter centrifuge from a basic layer which has formed on the filter agent after one or more extractions of the solids cake by means of a pairing knife and an extraction means, the basic layer being penetrated to saturation by fluid, characterised in that the drum speed of the filter centrifuge is in per se known manner reduced in accordance with the fact that the contents of the centrifuge rotate more rapidly than the drum (3) of the filter centrifuge with complete detachment from the filter medium, the speed of the drum (3) of the filter centrifuge being determined prior to its speed reduction so that there is no substantial degree of filtration of the fluid applied to the basic layer (19) from inside.
- A method according to Claim 1, characterised in that after detachment of the basic layer (19), the filter centrifuge is again filled with suspension as a result of the intense braking of the drum (3) and a normal cycle is set in motion to drain the suspension by centrifugal action and subsequent pairing and extraction of the layer of solids.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4004763 | 1990-02-15 | ||
| DE4004763 | 1990-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0443382A1 EP0443382A1 (en) | 1991-08-28 |
| EP0443382B1 true EP0443382B1 (en) | 1994-07-27 |
Family
ID=6400254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91101733A Expired - Lifetime EP0443382B1 (en) | 1990-02-15 | 1991-02-08 | Method for cleaning the filtration element of a filter centrifuge |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0443382B1 (en) |
| JP (1) | JPH04219156A (en) |
| DE (1) | DE59102298D1 (en) |
| ES (1) | ES2057619T3 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10114598A1 (en) | 2001-03-23 | 2002-10-02 | Aventis Pharma Gmbh | CIP-compliant design of a horizontal centrifuge with a solid jacket drum |
| CN106694246B (en) * | 2016-12-26 | 2019-04-23 | 江苏迈达新材料股份有限公司 | A kind of centrifugal material conveying device for 2,6 di tert butyl 4 methyl phenol |
| CN113286922A (en) * | 2019-01-17 | 2021-08-20 | 松下知识产权经营株式会社 | Washing machine and control method thereof |
| CN114011591A (en) * | 2021-09-18 | 2022-02-08 | 安徽东至广信农化有限公司 | Centrifugal machine for producing glyphosate and use method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE349605A (en) * | 1927-03-12 | |||
| DE1062633B (en) * | 1958-07-14 | 1959-07-30 | Westfalia Separator Ag | Method and device for cleaning centrifuge drums with outlet openings on the drum circumference |
| CH615604A5 (en) * | 1977-02-22 | 1980-02-15 | Escher Wyss Ag | |
| JPS5617497B1 (en) * | 1978-06-26 | 1981-04-22 | ||
| CH659007A5 (en) * | 1982-10-29 | 1986-12-31 | Escher Wyss Ag | METHOD FOR REGENERATING A COMPACT, IN PARTICULAR AN INSOLUBLE RESIDUAL LAYER IN A CENTRIFUGAL DRUM. |
| JPS6172144A (en) * | 1984-09-13 | 1986-04-14 | 東陶機器株式会社 | Toilet bowl washing apparatus |
| JPS6417935A (en) * | 1987-07-14 | 1989-01-20 | Inax Corp | Washer for closet |
| JPH0437676U (en) * | 1990-07-20 | 1992-03-30 |
-
1991
- 1991-02-08 DE DE59102298T patent/DE59102298D1/en not_active Expired - Fee Related
- 1991-02-08 EP EP91101733A patent/EP0443382B1/en not_active Expired - Lifetime
- 1991-02-08 ES ES91101733T patent/ES2057619T3/en not_active Expired - Lifetime
- 1991-02-12 JP JP3018790A patent/JPH04219156A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0443382A1 (en) | 1991-08-28 |
| JPH04219156A (en) | 1992-08-10 |
| DE59102298D1 (en) | 1994-09-01 |
| ES2057619T3 (en) | 1994-10-16 |
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