EP0631820B1 - Verfahren zum Betrieb von Schneckenzentrifugen - Google Patents
Verfahren zum Betrieb von Schneckenzentrifugen Download PDFInfo
- Publication number
- EP0631820B1 EP0631820B1 EP94107900A EP94107900A EP0631820B1 EP 0631820 B1 EP0631820 B1 EP 0631820B1 EP 94107900 A EP94107900 A EP 94107900A EP 94107900 A EP94107900 A EP 94107900A EP 0631820 B1 EP0631820 B1 EP 0631820B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifuge
- conveyor
- drum
- helix
- screw
- 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
Links
- 238000000034 method Methods 0.000 title claims description 10
- 239000007787 solid Substances 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 5
- 238000000605 extraction Methods 0.000 claims 2
- 230000005484 gravity Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 37
- 239000000126 substance Substances 0.000 description 14
- 239000004744 fabric Substances 0.000 description 6
- 239000008247 solid mixture Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
-
- 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
- B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
Definitions
- the invention relates to a method for operating screw centrifuges for the Separation of liquid-solid mixtures directed, consisting of a centrifuge drum, which is rotatably mounted about its longitudinal axis and the one coaxially arranged, rotating with different speed (leading or lagging) Conveying screw encloses the screw spirals on a screw drum are attached, wherein means for feeding the mixture to be separated in the centrifuge drum along its axis and on opposite Ends of the centrifuge drum openings for the discharge of the separated light and heavy materials are provided, the radial distance from the centrifuge drum shaft axis is less than the distance of the centrifuge drum wall from the centrifuge drum axis, so that when the screw centrifuge is operating under the influence of the centrifugal force inside the centrifuge drum Forms liquid ring.
- the separation takes place in this liquid ring under the influence of the centrifugal force in specifically heavy and in specifically light substances instead, whereby the specifically heavy substances (the solids) on the outer edge of the ring, i.e. on the centrifuge drum wall and the specifically light substances (the Layer) in the inner area of the ring.
- DE-A-25 51 788 describes a screw centrifuge with a screw conveyor rotating with respect to the drum at a differential speed, both the centrifuge drum and the screw being driven by a hydraulic motor. It is now known to brake the centrifuge drum, whereby the contents of the drum are completely emptied and the liquid reaches the solids discharge or the other end of the drum, depending on the direction of incline of the screw.
- US-A-4,978,331 also describes a screw centrifuge with respect to the Drum with differential speed rotating screw conveyor.
- the centrifuge When switching off the centrifuge is first switched off the drum drive motor. Hereby there is a maximum differential speed between the drum and the screw conveyor, which removes the remaining content from the screw conveyor becomes. Only then is the drive motor of the screw conveyor switched off. The drum or the screw conveyor will not slow down made, but only the respective drive motor switched off. Also this is only about emptying or clearing out one as completely as possible Screw centrifuge when it is switched off. In no way is it guaranteed that when turning off the screw centrifuge is not undesirable Liquid is flushed out through the solids discharge openings.
- the invention is therefore based on the object of a method for operating To create screw centrifuges, with which avoided when turning off the centrifuge is that in the centrifugal force field from the solid-liquid mixture separated light phase, i.e. the liquid gushing through the solids discharge openings is washed out.
- the collapsing Liquid ring also discharged on the solids discharge side of the centrifuge is and undesirably gets back into the separated solid proposed according to the invention, immediately before reaching the centrifuge speed, where the corresponding centrifugal force corresponds to the gravitational force, to change the speed of the screw conveyor suddenly.
- the measure is taken because the liquid ring revolves at drum speed sudden speed change due to its inertia can not follow and itself thus the difference in speed between the rotating liquid ring and the screw conveyor reverses, also the direction of conveyance in relation to the Liquid ring vice versa. Now if the liquid ring breaks down, the liquid screws itself along the spiral path of the screw conveyor Liquid discharge so that no liquid at the solids discharge openings Centrifuge is discharged.
- the conveying effect of screw conveyors is based on a speed difference between the screw conveyor and the material to be conveyed, the direction of conveyance by the direction of rotation and by the direction of the spiral of the screw conveyor is determined.
- the Speed of the screw conveyor is greater than the speed of the with the centrifuge drum circulating material to be conveyed, the heavy substances, which means that they Screw conveyor according to the direction of the spiral to one end of the Centrifuge are promoted.
- the liquid ring rotating with the centrifuge drum keeps as a result of it Sluggishness initially increases its speed, but is now faster than the braked one Screw conveyor, which causes the direction of conveyance towards the other Reverse end of the centrifuge.
- the liquid "screws up" the end of the centrifuge, at which the discharge openings for the light substances are arranged, and no occurs at the discharge openings for the heavy substances Liquid.
- the Speed of the screw conveyor is lower than the speed of the centrifuge drum (the direction of rotation of the centrifuge drum and screw conveyor or the direction the spiral of the screw conveyor runs in reverse to the screw centrifuge with leading screw conveyor), so that there is also a transport in the direction to the discharge openings for the heavy substances.
- the measure according to the invention thus successfully prevents when the liquid ring collapses, there is also liquid at the discharge opening (6) for the heavy substances (10) is also carried out.
- the invention is not only based on the embodiment shown in the drawing figure a countercurrent screw centrifuge, but also limited to other screw centrifuges, e.g. B. DC screw centrifuges, screen screw centrifuges etc. applicable, the screw conveyor with leading or lagging speed are driven.
Landscapes
- Centrifugal Separators (AREA)
Description
Claims (3)
- Verfahren zum Betrieb von Schneckenzentrifugen (1) für die Trennung von Flüssigkeits-Feststoffgemischen, bestehend aus einer Zentrifugentrommel (2), die um ihre Längsachse drehbar gelagert ist und die eine koaxial angeordnete, mit abweichender Drehzahl (voreilend oder nacheilend) umlaufende Förderschnecke (4) umschließt, deren Schneckenwendeln auf einer Schneckentrommel (13) befestigt sind, wobei Einrichtungen zum Zuführen des zu trennenden Gemisches in die Zentrifugentrommel längs deren Achse sowie an entgegengesetzten Enden der Zentrifugentrommel Öffnungen (5, 6) für den Austrag der getrennten leichten und schweren Stoffe vorgesehen sind, deren radialer Abstand von der Zentrifugentrommelwellenachse geringer ist als der Abstand der Zentrifugentrommelwand von der Zentrifugentrommelachse, so daß sich beim Betrieb der Schneckenzentrifuge (1) unter dem Einfluß der Zentrifugalkraft innerhalb der Zentrifugentrommel (2) ein Flüssigkeitsring ausbildet, dadurch gekennzeichnet, daß beim Abstellen der Zentrifuge (1) unmittelbar vor Erreichen der Zentrifugendrehzahl, bei der die entsprechende Zentrifugalkraft der Gravitationskraft entspricht und bei deren Unterschreitung dann ein Zusammenbrechen des Flüssigkeitsrings erfolgen würde, die Drehzahl der Förderschnecke (4) kurzfristig schlagartig so geändert wird, daß, da der Flüssigkeitsring aufgrund seiner Trägheit dieser Drehzahländerung nicht folgt, sich die Förderrichtung der Schneckenwendel (3) gegenüber dem Flüssigkeitsring umkehrt und der zusammenbrechende Flüssigkeitsring mit Hilfe der Schneckenwendel (3) zur Austragsöffnung (5) für die leichten Stoffe (11) transportiert wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Schneckenzentrifugen (1) mit voreilender Förderschnecke (4) die kurzfristig schlagartige Drehzahländerung durch einen Abbremsvorgang der Förderschnecke (4) hervorgerufen wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß bei Schneckenzentrifugen (1) mit nacheilender Förderschnecke (4) die kurzfristig schlagartige Drehzahländerung durch eine Beschleunigung der Förderschnecke (4) erfolgt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4321964 | 1993-07-01 | ||
DE4321964A DE4321964A1 (de) | 1993-07-01 | 1993-07-01 | Verfahren zum Betrieb von Schneckenzentrifugen |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0631820A2 EP0631820A2 (de) | 1995-01-04 |
EP0631820A3 EP0631820A3 (de) | 1995-05-31 |
EP0631820B1 true EP0631820B1 (de) | 1999-10-27 |
Family
ID=6491739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94107900A Expired - Lifetime EP0631820B1 (de) | 1993-07-01 | 1994-05-21 | Verfahren zum Betrieb von Schneckenzentrifugen |
Country Status (4)
Country | Link |
---|---|
US (1) | US5474515A (de) |
EP (1) | EP0631820B1 (de) |
DE (2) | DE4321964A1 (de) |
DK (1) | DK0631820T3 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4439938A1 (de) | 1994-11-09 | 1996-05-15 | Kloeckner Humboldt Deutz Ag | Verfahren zum Betrieb von Schneckenzentrifugen |
DE19952804C2 (de) * | 1999-11-02 | 2003-07-03 | Westfalia Separator Ind Gmbh | Vollmantel-Schneckenzentrifuge zur Verarbeitung eines zur Schäumung neigenden Schleudergutes |
DE10220757B4 (de) * | 2002-05-08 | 2004-06-24 | Westfalia Separator Ag | Zentrifuge, insbesondere Separator |
DE10223802B4 (de) * | 2002-05-29 | 2005-06-09 | Westfalia Separator Ag | Vollmantel-Schneckenzentrifuge |
US6972411B2 (en) * | 2002-10-03 | 2005-12-06 | Schick Technologies, Inc. | Method of event detection for intraoral image sensor |
KR100920449B1 (ko) | 2007-10-04 | 2009-10-08 | 이강찬 | 원심분리기 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1632325B1 (de) * | 1967-06-02 | 1970-05-27 | Turbo Separator Ag | Kontinuierlich arbeitende, sieblose Schneckenzentrifuge |
US3494542A (en) * | 1968-05-27 | 1970-02-10 | Pennwalt Corp | Centrifuging process and apparatus |
DE2063063C3 (de) * | 1970-12-22 | 1975-10-16 | Amberger Kaolinwerke Gmbh, 8452 Hirschau | Verfahren zum Abtrennen der Feststoffe aus einer Suspension, sowie zur Förderung des inneren Transportes und des Austrage des eingedickten Schlammes in Vollmantelzentrifugen, sowie zur Durchführung des Verfahrens dienende Zentrifugen |
DE2125522A1 (en) * | 1971-05-22 | 1972-12-07 | Mse Holdings Ltd | Centrifugal separator - with by-pass chamber esp for machine tool coolant with swarf |
DE2551788A1 (de) * | 1975-11-18 | 1977-06-02 | Flottweg Werk Bruckmayer | Vollmantel-schneckenzentrifuge mit differenzdrehzahlvariabler kupplung zwischen mantelteil und schneckenteil |
SU582001A1 (ru) * | 1976-06-23 | 1977-11-30 | Всесоюзный научно-исследовательский и проектный институт галургии | Способ автоматического управлени процессом разделени суспензии в шнековой осадительной центрифуге |
DE2835108A1 (de) * | 1978-08-10 | 1980-02-14 | Lacher Jorge Halder | Verfahren zum trennen von zuckerkristallen aus einer fluiden substanz, die zuckerkristalle enthaelt, und automatisch austragende zentrifuge |
DE3044797A1 (de) * | 1980-11-28 | 1982-07-01 | Fluormatic GmbH, 7407 Rottenburg | Verfahren und vorrichtung zum mechanischen trennen von feststoffteilen aus fluessigkeiten durch zentrifugieren |
US5176616A (en) * | 1989-06-29 | 1993-01-05 | Kloeckner-Humboldt-Deutz Aktiengesellschaft | Method and apparatus for the after-treatment of the thick material in the thick material discharge region of a solid bowl worm centrifuge |
US4978331A (en) * | 1989-07-11 | 1990-12-18 | Alfa-Laval Ab | Method and apparatus for cleaning in place of a decanter centrifuge |
DE4104752A1 (de) * | 1990-02-15 | 1991-08-22 | Krauss Maffei Ag | Verfahren zum reinigen des filtermittels einer filterzentrifuge |
-
1993
- 1993-07-01 DE DE4321964A patent/DE4321964A1/de not_active Withdrawn
-
1994
- 1994-05-21 DK DK94107900T patent/DK0631820T3/da active
- 1994-05-21 EP EP94107900A patent/EP0631820B1/de not_active Expired - Lifetime
- 1994-05-21 DE DE59408853T patent/DE59408853D1/de not_active Expired - Fee Related
- 1994-06-28 US US08/267,561 patent/US5474515A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5474515A (en) | 1995-12-12 |
EP0631820A2 (de) | 1995-01-04 |
DK0631820T3 (da) | 2000-01-17 |
EP0631820A3 (de) | 1995-05-31 |
DE59408853D1 (de) | 1999-12-02 |
DE4321964A1 (de) | 1995-01-12 |
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