EP0156311A2 - Procédé pour l'introduction d'une solution d'un agent auxiliaire dans la chambre d'entrée d'un décanteur centrifuge, et dispositif pour la mise en oeuvre dudit procédé - Google Patents

Procédé pour l'introduction d'une solution d'un agent auxiliaire dans la chambre d'entrée d'un décanteur centrifuge, et dispositif pour la mise en oeuvre dudit procédé 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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EP
European Patent Office
Prior art keywords
solution
liquid
solids
auxiliary
auxiliary agent
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.)
Withdrawn
Application number
EP85103308A
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German (de)
English (en)
Other versions
EP0156311A3 (fr
Inventor
Walter Dr. Dipl.-Ing. Goesele
Heinz Dipl.-Ing. Kulle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP0156311A2 publication Critical patent/EP0156311A2/fr
Publication of EP0156311A3 publication Critical patent/EP0156311A3/fr
Withdrawn legal-status Critical Current

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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.

Landscapes

  • Centrifugal Separators (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
EP85103308A 1984-03-30 1985-03-21 Procédé pour l'introduction d'une solution d'un agent auxiliaire dans la chambre d'entrée d'un décanteur centrifuge, et dispositif pour la mise en oeuvre dudit procédé Withdrawn EP0156311A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843411728 DE3411728A1 (de) 1984-03-30 1984-03-30 Verfahren zum einbringen einer hilfsstoff-loesung in die einlaufkammer einer dekantierzentrifuge sowie eine anordnung zur durchfuehrung des verfahrens
DE3411728 1984-03-30

Publications (2)

Publication Number Publication Date
EP0156311A2 true EP0156311A2 (fr) 1985-10-02
EP0156311A3 EP0156311A3 (fr) 1987-10-14

Family

ID=6232042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103308A Withdrawn EP0156311A3 (fr) 1984-03-30 1985-03-21 Procédé pour l'introduction d'une solution d'un agent auxiliaire dans la chambre d'entrée d'un décanteur centrifuge, et dispositif pour la mise en oeuvre dudit procédé

Country Status (2)

Country Link
EP (1) EP0156311A3 (fr)
DE (1) DE3411728A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288197A2 (fr) * 1987-04-21 1988-10-26 Klöckner-Humboldt-Deutz Aktiengesellschaft Décanteur centrifuge comportant un dispositif de déchargement pneumatique
US20110105292A1 (en) * 2008-06-06 2011-05-05 M-I L.L.C. Dual feed centrifuge
CN102886315A (zh) * 2011-07-19 2013-01-23 上海市离心机械研究所有限公司 一种卧螺离心机工作状态的模拟装置及其使用方法
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 (de) * 1957-08-23 1961-03-02 Krauss Maffei Ag Verfahren und Vorrichtung zum Eindicken von Schlamm, insbesondere Abwasserschlamm, der schwer sedimentierbare Bestandteile enthaelt, durch Zentrifugieren unter Verwendung eines Flockungsmittels
GB954172A (en) * 1963-02-15 1964-04-02 Bird Machine Co Centrifugal separator
DE1215606B (de) * 1963-01-31 1966-04-28 Beteiligungs & Patentverw Gmbh Vorrichtung zum Vermischen von Flockungsmitteln mit Schlaemmen in Absetzzentrifugen
DE2822533A1 (de) * 1977-05-24 1978-12-07 Broadbent & Sons Ltd Thomas Festkoerper-vollmanteldekantierzentrifuge

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 (de) * 1957-08-23 1961-03-02 Krauss Maffei Ag Verfahren und Vorrichtung zum Eindicken von Schlamm, insbesondere Abwasserschlamm, der schwer sedimentierbare Bestandteile enthaelt, durch Zentrifugieren unter Verwendung eines Flockungsmittels
DE1215606B (de) * 1963-01-31 1966-04-28 Beteiligungs & Patentverw Gmbh Vorrichtung zum Vermischen von Flockungsmitteln mit Schlaemmen in Absetzzentrifugen
GB954172A (en) * 1963-02-15 1964-04-02 Bird Machine Co Centrifugal separator
DE2822533A1 (de) * 1977-05-24 1978-12-07 Broadbent & Sons Ltd Thomas Festkoerper-vollmanteldekantierzentrifuge

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0288197A2 (fr) * 1987-04-21 1988-10-26 Klöckner-Humboldt-Deutz Aktiengesellschaft Décanteur centrifuge comportant un dispositif de déchargement pneumatique
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 (zh) * 2011-07-19 2013-01-23 上海市离心机械研究所有限公司 一种卧螺离心机工作状态的模拟装置及其使用方法
CN102886315B (zh) * 2011-07-19 2014-01-15 上海市离心机械研究所有限公司 一种卧螺离心机工作状态的模拟装置及其使用方法

Also Published As

Publication number Publication date
DE3411728A1 (de) 1985-10-10
EP0156311A3 (fr) 1987-10-14

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Inventor name: GOESELE, WALTER, DR. DIPL.-ING.

Inventor name: KULLE, HEINZ, DIPL.-ING.