EP0156311A2 - Method for introducing a solution of an auxiliary agent into the entry chamber of a decanting centrifuge, and device for carrying out this method - Google Patents

Method for introducing a solution of an auxiliary agent into the entry chamber of a decanting centrifuge, and device for carrying out this method Download PDF

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Publication number
EP0156311A2
EP0156311A2 EP85103308A EP85103308A EP0156311A2 EP 0156311 A2 EP0156311 A2 EP 0156311A2 EP 85103308 A EP85103308 A EP 85103308A EP 85103308 A EP85103308 A EP 85103308A EP 0156311 A2 EP0156311 A2 EP 0156311A2
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Prior art keywords
solution
liquid
solids
auxiliary
auxiliary agent
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EP85103308A
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German (de)
French (fr)
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EP0156311A3 (en
Inventor
Walter Dr. Dipl.-Ing. Goesele
Heinz Dipl.-Ing. Kulle
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BASF SE
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BASF SE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl

Definitions

  • the present invention relates to a method for introducing an auxiliary substance solution into a liquid loaded with solids and fed to the inlet chamber of a decanter centrifuge, and to an arrangement for carrying out the method.
  • Decanter centrifuges - hereinafter referred to as centrifuges - are used to separate solids from a liquid, for example when separating finely divided solids from waste water sludges.
  • centrifuges - are used to separate solids from a liquid, for example when separating finely divided solids from waste water sludges.
  • the effectiveness of such centrifuges is improved by adding a flocculant to the liquid flowing into the inlet chamber of the centrifuge. This flocculant agglomerates the finely divided solid particles so that they sediment better, which in turn improves the degree of separation of the centrifuge.
  • the object of the invention is therefore to improve the mixing of the flocculant with the sludge in such a way that the consumption of flocculant is minimized.
  • auxiliary solution of the liquid loaded with solids is supplied within the inlet chamber of the decanter centrifuge so that the mixing of the auxiliary solution with the liquid takes place where the highest shear forces occur.
  • the centrifuge drum 1 is rotatably mounted about a horizontal axis. Coaxial within the centrifuge drum is a likewise rotating screw conveyor 2 with screw conveyor blades 3.
  • the inlet pipe 5 opens into the inlet chamber 4, via which the liquid 6 (sludge) containing solids enters the inlet chamber.
  • At least one, advantageously several, injection tubes 7 are arranged in the interior of the inlet pipe and protrude beyond the end of the inlet pipe. Via these injection tubes, the auxiliary solution 8 is supplied under pressure to the inlet chamber and injected into the sludge 6, which is in a turbulent rotary movement in the inlet chamber.
  • auxiliary solution 8 In order to inject the auxiliary solution 8 at high pressure from the injection tubes 7 into the rotating sludge 6, they are closed at the front, as shown in FIG. 2, and are provided with a plurality of lateral openings 15. These openings are preferably bores with a diameter of 0.5 to 3 mm and are oriented in such a way that the emerging auxiliary substance solution is evenly distributed in the rotating sludge. In the drawing, for example, only one opening is indicated through which the Auxiliary solution is sprayed out in the middle of the inlet chamber. If there are several openings, they are designed in a fan-like manner in order to distribute the auxiliary solution evenly.
  • the number and size of the openings are coordinated such that the auxiliary solution does not emerge as a drop at the desired throughput, but rather as a jet.
  • auxiliary solution containing 0.1% synthetic polymeric flocculant an opening with a diameter of 1 mm is suitable.
  • the jet formation becomes more difficult.
  • 1% synthetic polymeric flocculant in the auxiliary solution a pressure of 4 bar and a throughput of 17 l / h are required in order to allow a jet to emerge from the opening of 1 mm in diameter.
  • auxiliary solution often has to be varied within wide limits in practice.
  • wastewater sludges from biological sewage treatment plants which have strongly changing properties and accordingly require periodically fluctuating amounts of flocculants.
  • This variation of the throughput of auxiliary material solution is possible above the minimum throughput at which a liquid jet is created by adjusting the metering unit up to the maximum pressure. If this range of variation is insufficient, several injection tubes 7 can be installed, which are switched on and off individually depending on the throughput.
  • this possibility only exists in the case of large centrifuges with a throughput of auxiliary material solution which is sufficient for several liquid jets. In the case of smaller centrifuges, the throughput of auxiliary substance solution must be reduced by preparing the auxiliary substance solution with a reduced concentration.
  • the arrangement b according to the invention achieved on average 5 to 10% higher separations than with arrangement a, for example 95% separation efficiency versus 90% separation efficiency.

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  • Centrifugal Separators (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Method for introducing a solution of an auxiliary agent into a liquid charged with solids and fed into the entry chamber of a decanting centrifuge, the solution of the auxiliary agent of the liquid charged with solids being fed to the decanting centrifuge inside the entry chamber in such a way that the mixing of the solution of the auxiliary agent with the liquid takes place where the highest shearing forces occur. <IMAGE>

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Einbringen einer Hilfsstoff-Lösung in eine mit Feststoffen beladene, der Einlaufkammer einer Dekantierzentrifuge zugeführte Flüssigkeit sowie eine Anordnung zur Durchführung des Verfahrens.The present invention relates to a method for introducing an auxiliary substance solution into a liquid loaded with solids and fed to the inlet chamber of a decanter centrifuge, and to an arrangement for carrying out the method.

Dekantierzentrifugen - im weiteren Zentrifuge genannt - dienen dazu, Feststoffe aus einer Flüssigkeit abzutrennen, beispielsweise bei der Abtrennung von feinteiligen Feststoffen aus Abwasserschlämmen. Bei solchen feinteiligen Feststoffen wird die Wirksamkeit solcher Zentrifugen dadurch verbessert, daß der in die Einlaufkammer der Zentrifuge zulaufenden Flüssigkeit ein Flockungsmittel zugegeben wird. Dieses Flockungsmittel bringt die feinteiligen Feststoffteile zum Agglomerieren, so daß dieselben besser sedimentieren, was wiederum den Abscheidegrad der Zentrifuge verbessert.Decanter centrifuges - hereinafter referred to as centrifuges - are used to separate solids from a liquid, for example when separating finely divided solids from waste water sludges. With such fine-particle solids, the effectiveness of such centrifuges is improved by adding a flocculant to the liquid flowing into the inlet chamber of the centrifuge. This flocculant agglomerates the finely divided solid particles so that they sediment better, which in turn improves the degree of separation of the centrifuge.

Eine solche Zentrifuge ist im Aufbau und in der Wirkungsweise in der DE-OS 28 22 533 ausführlich und detailliert beschrieben. Gemäß Zeichnung la der vorgenannten DE-OS wird die Flüssigkeit (Suspension) über eine stationäre Zuführleitung in die Einlaufkammer der Zentrifuge eingeführt. Über eine in der Zuführleitung angeordnete zweite Zuführleitung - die innerhalb der Zuführleitung für die Suspension endet - wird die Hilfsstoff-Lösung, die das Flockungsmittel enthält, drucklos der Zulaufkammer zugeführt. Die Flockung der feinteiligen Feststoffteile sowie die Trennung von Flüssigkeit und Feststoffteilen unter Wirkung der Zentrifugalkraft erfolgt wie in der obigen DE-OS beschrieben.Such a centrifuge is described in detail and in detail in the structure and mode of operation in DE-OS 28 22 533. According to drawing la of the aforementioned DE-OS, the liquid (suspension) is introduced into the inlet chamber of the centrifuge via a stationary feed line. Via a second feed line arranged in the feed line - which ends within the feed line for the suspension - the auxiliary substance solution, which contains the flocculant, is fed to the feed chamber without pressure. The flocculation of the finely divided solid parts and the separation of liquid and solid parts under the action of the centrifugal force takes place as described in the above DE-OS.

Für den sparsamen Verbrauch und die gute Wirkung des Flockungsmittels ist es jedoch von entscheidender Bedeutung, an welcher Stelle das Flockungsmittel dem Schlamm beigemischt wird.For the economical use and the good effect of the flocculant, it is of crucial importance at which point the flocculant is added to the sludge.

So erwies sich als Nachteil bei der beschriebenen Zentrifuge, daß die Vermischung von Schlamm und Flockungsmittel nicht ausreichend war.A disadvantage of the centrifuge described was that the mixing of sludge and flocculant was not sufficient.

Der Erfindung liegt daher die Aufgabe zugrunde, das Vermischen des Flokkungsmittels mit dem Schlamm so zu verbessern, daß der Verbrauch an Flokkungsmittel minimiert wird.The object of the invention is therefore to improve the mixing of the flocculant with the sludge in such a way that the consumption of flocculant is minimized.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Hilfsstoff--Lösung der mit Feststoffen beladenen Flüssigkeit innerhalb der Einlaufkammer der Dekantierzentrifuge so zugeführt wird, daß die Vermishung der Hilfsstoff-Lösung mit der Flüssigkeit dort erfolgt, wo die höchsten Scherkräfte auftreten.This object is achieved in that the auxiliary solution of the liquid loaded with solids is supplied within the inlet chamber of the decanter centrifuge so that the mixing of the auxiliary solution with the liquid takes place where the highest shear forces occur.

Weitere Merkmale des erfindungsgemäßen Verfahrens sind Gegenstand der Unteransprüche.Further features of the method according to the invention are the subject of the dependent claims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and will be described in more detail below.

Es zeigen

  • Figur 1 einen Längsschnitt durch eine Zentrifuge,
  • Figur 2 einen Längsschnitt durch einen Teil der Zentrifuge, speziell der Einlaufkammer.
Show it
  • FIG. 1 shows a longitudinal section through a centrifuge,
  • Figure 2 shows a longitudinal section through part of the centrifuge, especially the inlet chamber.

Wie in Figur 1 dargestellt, ist die Zentrifugentrommel 1 um eine horizontale Achse drehbar gelagert. Koaxial innerhalb der Zentrifugentrommel befindet sich eine ebenfalls rotierende Förderschnecke 2 mit Förderschneckenblätter 3.In die Einlaufkammer 4 mündet das Zulaufrohr 5, über das die Feststoffe enthaltende Flüssigkeit 6 (Schlamm) in die Einlaufkammer gelangt. Im Inneren des Zulaufrohres sind mindestens eines, vorteilhaft mehrere, Einspritzröhrchen 7 angeordnet, die über das Ende des Zulaufrohrs hinausragen. Über diese Einspritzröhrchen wird die Hilfsstoff-Lösung 8 unter Druck der Einlaufkammer zugeführt und in den Schlamm 6 eingespritzt, der sich in der Einlaufkammer in turbulenter Drehbewegung befindet. Derselbe tritt von der Einlaufkammer in den Sedimentationsraum 9 ein, wo er als rotierender Ring starker Fliehkraft ausgesetzt ist. Dort werden die suspendierten Feststoffe auf der rotierenden Trommelwand abgeschieden, und die feststoffreie Flüssigkeit 10 läuft über die öffnungen 11 und 12 aus der Zentrifuge ab. Die abgeschiedenen Feststoffe werden mittels der Förderschnecke mit den Förderschneckenblättern zum anderen Ende der Zentrifugentrommel befördert und dort als Konzentrat 13 über die öffnung 14 aus der Zentrifuge ausgetragen.As shown in Figure 1, the centrifuge drum 1 is rotatably mounted about a horizontal axis. Coaxial within the centrifuge drum is a likewise rotating screw conveyor 2 with screw conveyor blades 3. The inlet pipe 5 opens into the inlet chamber 4, via which the liquid 6 (sludge) containing solids enters the inlet chamber. At least one, advantageously several, injection tubes 7 are arranged in the interior of the inlet pipe and protrude beyond the end of the inlet pipe. Via these injection tubes, the auxiliary solution 8 is supplied under pressure to the inlet chamber and injected into the sludge 6, which is in a turbulent rotary movement in the inlet chamber. The same enters the sedimentation chamber 9 from the inlet chamber, where it is exposed to strong centrifugal force as a rotating ring. There the suspended solids are separated on the rotating drum wall, and the solids-free liquid 10 runs out of the centrifuge via the openings 11 and 12. The separated solids are conveyed to the other end of the centrifuge drum by means of the screw conveyor with the screw conveyor blades and are discharged there as concentrate 13 from the centrifuge via the opening 14.

Um die Hilfsstofflösung 8 mit hohem Druck aus den Einspritzröhrchen 7 in den rotierenden Schlamm 6 auszuspritzen, sind dieselben - wie in Figur 2 dargestellt - vorne verschlossen und mit mehreren seitlichen öffnungen 15 versehen. Diese öffnungen sind vorzugsweise Bohrungen mit 0,5 bis 3 mm Durchmesser und sind so ausgerichtet, daß die austretende Hilfsstoff--Lösung gleichmäßig in den rotierenden Schlamm verteilt wird. In der Zeichnung ist beispielweise nur eine öffnung angedeutet, durch die die Hilfsstoff-Lösung in der Mitte der Einlaufkammer ausgespritzt wird. Sind mehrere öffnungen vorhanden, so werden diese fächerartig ausgebildet, um die Hilfsstoff-Lösung gleichmäßig zu verteilen. Zahl und Größe der öffnungen sind so abgestimmt, daß die Hilfsstoff-Lösung beim gewünschten Durchsatz nicht als Tropfen, sondern als Strahl austritt. So ist beispielsweise bei einem Durchsatz von 10 1/h Hilfsstoff-Lösung mit einem Gehalt von 0,1 % synthetischem polymeren Flockungsmittel eine öffnung mit 1 mm Durchmesser geeignet. Bei Hilfsstoff-Lösungen mit einem höheren Gehalt an synthetischem, polymerem Flockungsmittel wird die Strahlbildung schwieriger. So ist bei 1 % synthetischem polymerem Flockungsmittel in der Hilfsstoff-Lösung ein Druck von 4 bar und ein Durchsatz von 17 1/h erforderlich, um aus der öffnung von 1 mm Durchmesser einen Strahl austreten zu lassen.In order to inject the auxiliary solution 8 at high pressure from the injection tubes 7 into the rotating sludge 6, they are closed at the front, as shown in FIG. 2, and are provided with a plurality of lateral openings 15. These openings are preferably bores with a diameter of 0.5 to 3 mm and are oriented in such a way that the emerging auxiliary substance solution is evenly distributed in the rotating sludge. In the drawing, for example, only one opening is indicated through which the Auxiliary solution is sprayed out in the middle of the inlet chamber. If there are several openings, they are designed in a fan-like manner in order to distribute the auxiliary solution evenly. The number and size of the openings are coordinated such that the auxiliary solution does not emerge as a drop at the desired throughput, but rather as a jet. For example, with a throughput of 10 1 / h auxiliary solution containing 0.1% synthetic polymeric flocculant, an opening with a diameter of 1 mm is suitable. With auxiliary solutions with a higher content of synthetic, polymeric flocculant, the jet formation becomes more difficult. With 1% synthetic polymeric flocculant in the auxiliary solution, a pressure of 4 bar and a throughput of 17 l / h are required in order to allow a jet to emerge from the opening of 1 mm in diameter.

Der Durchsatz an Hilfsstoff-Lösung muß in der Praxis oft in weiten Grenzen variiert werden. So gibt es Abwasserschlämme aus biologischen Kläranlagen, die stark wechselnde Eigenschaften haben und entsprechend periodisch schwankende Mengen an Flockungsmittel benötigen. Diese Variation des Durchsatzes an Hilfstoff-Lösung ist oberhalb des Mindestdurchsatzes, bei dem ein Flüssigkeitsstrahl entsteht, durch Verstellen des Dosieraggregats bis zum Maximaldruck möglich. Falls dieser Variationsbereich nicht ausreicht, können mehrere Einspritz-Röhrchen 7 eingebaut werden, die je nach Durchsatz einzeln zu- und abgeschaltet'werden. Diese Möglichkeit besteht jedoch nur bei großen Zentrifugen mit einem Durchsatz an Hilfsstoff--Lösung, der für mehrere Flüssigkeitsstrahlen ausreicht. Bei kleineren Zentrifugen muß der Durchsatz an Hilfsstoff-Lösung dadurch verringert werden, daß die Hilfsstoff-Lösung mit verminderter Konzentration angesetzt wird.The throughput of auxiliary solution often has to be varied within wide limits in practice. There are wastewater sludges from biological sewage treatment plants, which have strongly changing properties and accordingly require periodically fluctuating amounts of flocculants. This variation of the throughput of auxiliary material solution is possible above the minimum throughput at which a liquid jet is created by adjusting the metering unit up to the maximum pressure. If this range of variation is insufficient, several injection tubes 7 can be installed, which are switched on and off individually depending on the throughput. However, this possibility only exists in the case of large centrifuges with a throughput of auxiliary material solution which is sufficient for several liquid jets. In the case of smaller centrifuges, the throughput of auxiliary substance solution must be reduced by preparing the auxiliary substance solution with a reduced concentration.

Beispielsweise war Belebtschlamm aus einer biologischen Kläranlage auf 3 g/1 statisch eingedickt und wurde in einer Zentrifuge bis auf 9 % Feststoffgehalt aufkonzentriert. Dabei wurde als Flockungsmittel eine Hilfsstoff-Lösung mit 0,1 % synthetischem polymerem Flockungsmittel verwendet. Diese Hilfsstoff-Lösung wurde im mehrfachen Wechsel an zwei verschiedenen Stellen dem Schlamm beigemischt:

  • a) über ein vorne offenes Röhrchen, das bis zum Ende des Zulaufrohres reichte
  • b) über ein Einspritzrohr mit einer seitlichen öffnung von 1 mm Durchmesser gemäß dieser Erfindung.
For example, activated sludge from a biological sewage treatment plant had been statically thickened to 3 g / 1 and was concentrated in a centrifuge to a solids content of 9%. An auxiliary solution with 0.1% synthetic polymeric flocculant was used as the flocculant. This auxiliary solution was mixed into the sludge several times at two different locations:
  • a) via a tube open at the front, which reached to the end of the inlet pipe
  • b) via an injection pipe with a lateral opening of 1 mm diameter according to this invention.

Bei gleicher Menge an zugegebener Flockungsmittel-Lösung wurden mit der erfindungsgemäßen Anordnung b im Durchschnitt 5 bis 10 % höhere Abscheide grade als mit Anordnung a erreicht, beispielsweise 95 % Abscheidegrag gegenüber 90 % Abscheidegrad.With the same amount of added flocculant solution, the arrangement b according to the invention achieved on average 5 to 10% higher separations than with arrangement a, for example 95% separation efficiency versus 90% separation efficiency.

Zeichn.Sign.

Claims (4)

1. Verfahren zum Einbringen einer Hilfsstoff-Lösung in eine mit Feststoffen beladene, der Einlaufkammer einer Dekantierzentrifuge zugeführte Flüssigkeit, dadurch gekennzeichnet, daß die Hilfsstoff-Lösung der mit Feststoffen beladenen Flüssigkeit innerhalb der Einlaufkammer der Dekantierzentrifuge so zugeführt wird, daß die Vermischung der Hilfsstoff-Lösung mit der Flüssigkeit dort erfolgt, wo die höchsten Scherkräfte auftreten.1. A method for introducing an auxiliary substance solution into a liquid loaded with solids, the inlet chamber of a decanter centrifuge, characterized in that the auxiliary substance solution of the liquid laden with solids is supplied within the inlet chamber of the decanter centrifuge such that the mixing of the auxiliary substance Solution with the liquid takes place where the highest shear forces occur. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Hilfsstoff--Lösung als Flüssigkeitsstrahl mit Druck, vorzugsweise 0,5 bis 10 bar, in die mit Feststoffen beladene Flüssigkeit eingespritzt wird.2. The method according to claim 1, characterized in that the auxiliary solution is injected as a liquid jet with pressure, preferably 0.5 to 10 bar, into the liquid loaded with solids. 3. Anordnung zur Durchführung des Verfahrens gemäß Ansprüchen 1 und 2, dadurch gekennzeichnet, daß ein oder mehrere Einspritzröhrchen (7) verwendet werden, die mit ihrem vorderen Ende über das Zulaufrohr (5) hinausragen.3. Arrangement for performing the method according to claims 1 and 2, characterized in that one or more injection tubes (7) are used, which protrude with their front end over the inlet pipe (5). 4. Anordnung zur Durchführung des Verfahrens gemäß Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Einspritzdüsen (7) vorne verschlossen sind und am vorderen Ende seitliche Bohrungen (15) oder Schlitze aufweisen.4. Arrangement for performing the method according to claims 1 to 3, characterized in that the injection nozzles (7) are closed at the front and have lateral bores (15) or slots at the front end.
EP85103308A 1984-03-30 1985-03-21 Method for introducing a solution of an auxiliary agent into the entry chamber of a decanting centrifuge, and device for carrying out this method Withdrawn EP0156311A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843411728 DE3411728A1 (en) 1984-03-30 1984-03-30 METHOD FOR INPUTING AN AUXILIARY SOLUTION INTO THE INLET CHAMBER OF A DECANTER CENTRIFUGE, AND AN ARRANGEMENT FOR IMPLEMENTING THE METHOD
DE3411728 1984-03-30

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EP0156311A2 true EP0156311A2 (en) 1985-10-02
EP0156311A3 EP0156311A3 (en) 1987-10-14

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288197A2 (en) * 1987-04-21 1988-10-26 Klöckner-Humboldt-Deutz Aktiengesellschaft Decanter centrifuge incorporating airlift device
US20110105292A1 (en) * 2008-06-06 2011-05-05 M-I L.L.C. Dual feed centrifuge
CN102886315A (en) * 2011-07-19 2013-01-23 上海市离心机械研究所有限公司 Device for simulating operating state of horizontal spiral centrifuge, and use method of device
US9266122B2 (en) 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1101301B (en) * 1957-08-23 1961-03-02 Krauss Maffei Ag Method and device for thickening sludge, in particular sewage sludge, which contains constituents that are difficult to sediment, by centrifugation using a flocculant
GB954172A (en) * 1963-02-15 1964-04-02 Bird Machine Co Centrifugal separator
DE1215606B (en) * 1963-01-31 1966-04-28 Beteiligungs & Patentverw Gmbh Device for mixing flocculants with slurries in settling centrifuges
DE2822533A1 (en) * 1977-05-24 1978-12-07 Broadbent & Sons Ltd Thomas SOLID FULL CASE DECANTING CENTRIFUGE

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228594A (en) * 1965-02-05 1966-01-11 Clifford L Amero Centrifugal separator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1101301B (en) * 1957-08-23 1961-03-02 Krauss Maffei Ag Method and device for thickening sludge, in particular sewage sludge, which contains constituents that are difficult to sediment, by centrifugation using a flocculant
DE1215606B (en) * 1963-01-31 1966-04-28 Beteiligungs & Patentverw Gmbh Device for mixing flocculants with slurries in settling centrifuges
GB954172A (en) * 1963-02-15 1964-04-02 Bird Machine Co Centrifugal separator
DE2822533A1 (en) * 1977-05-24 1978-12-07 Broadbent & Sons Ltd Thomas SOLID FULL CASE DECANTING CENTRIFUGE

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288197A2 (en) * 1987-04-21 1988-10-26 Klöckner-Humboldt-Deutz Aktiengesellschaft Decanter centrifuge incorporating airlift device
EP0288197A3 (en) * 1987-04-21 1989-10-25 Robert Edward High Decanter centrifuge incorporating airlift device
US20110105292A1 (en) * 2008-06-06 2011-05-05 M-I L.L.C. Dual feed centrifuge
US8961381B2 (en) * 2008-06-06 2015-02-24 M-I L.L.C. Dual feed centrifuge
US9266122B2 (en) 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator
CN102886315A (en) * 2011-07-19 2013-01-23 上海市离心机械研究所有限公司 Device for simulating operating state of horizontal spiral centrifuge, and use method of device
CN102886315B (en) * 2011-07-19 2014-01-15 上海市离心机械研究所有限公司 Device for simulating operating state of horizontal spiral centrifuge, and use method of device

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EP0156311A3 (en) 1987-10-14
DE3411728A1 (en) 1985-10-10

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