EP0331924A2 - Centrifugeuse à poussoir - Google Patents
Centrifugeuse à poussoir Download PDFInfo
- Publication number
- EP0331924A2 EP0331924A2 EP89102291A EP89102291A EP0331924A2 EP 0331924 A2 EP0331924 A2 EP 0331924A2 EP 89102291 A EP89102291 A EP 89102291A EP 89102291 A EP89102291 A EP 89102291A EP 0331924 A2 EP0331924 A2 EP 0331924A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve drum
- surface elements
- drum
- sieve
- centrifuge according
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
- B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges
Definitions
- the invention relates to a pusher centrifuge with at least one rotatable, at least approximately cylindrical sieve drum in a housing, in the interior of which a centrifugal material can be fed at one end, and with at least one co-rotating thrust ring, which oscillates in the axial direction of the sieve drum while transporting the at least partially dewatered Spin material is able to carry out on the inside of the sieve drum in the direction of a solids outlet provided at the other end thereof.
- Such push centrifuges are known, for example, from US-A-4 217 226 and US-A-4 209 405 and are used for the continuous dewatering of a centrifugal material, said centrifugal material being fed to the inner end of a material via a feed pipe Centrifugal chamber is fed and is gradually drained on the inside of the sieve drums. During this process, the centrifugal material is gradually transported towards the solids outlet by the axially oscillating movement of one or more thrust rings, the innermost of which is designed as a push floor, and at the same time non-dewatered centrifugal material is refilled in the vicinity of the first thrust ring.
- Such a pusher centrifuge can have a plurality of sieve drums, two adjacent sieve drums each oscillating in the axial direction relative to one another and the edge of the inner sieve drum acting as a push ring.
- the push floor can oscillate in a single-stage push centrifuge, the drum in a two-step centrifuge, the push floor and the second drum in a three-step centrifuge, and the first and third drums in a four-step centrifuge.
- the degree of dewatering or the residual moisture of the discharged solid is, however, not yet optimal in the case of known push centrifuges.
- An improvement could be achieved by extending the drainage time are, however, which reduces the throughput of the centrifuged material, or by increasing the speed of the centrifuge, which is not possible due to the abrasion occurring and for reasons of strength, and also makes the solid cake even more compact and therefore even more impermeable.
- the object of the invention is to increase the degree of dewatering of a pusher centrifuge of the type specified at the outset and to reduce the residual moisture of the discharged solid without changing the operating parameters of the centrifuge and without a more complicated construction.
- this object is achieved in that surface elements are provided on the outer edge of at least one thrust ring, which are oriented obliquely to the axis of the sieve drum and impart an additional movement component in the circumferential direction of the centrifugal drum during the oscillating movement. It is particularly advantageous to provide the outer edge of at least one inner sieve drum, which is able to oscillate relative to an outer sieve drum, with such inclined surface elements.
- the surface elements can be provided on the edge of an oscillating screen drum, or else on the edge of a non-oscillating drum, the sideways movement or shearing action being provided by the following oscillating drum.
- the surface elements can be flat surfaces which form an angle with the axis of the screening drum approximately between 30 ° and 60 °, or they can be curved surfaces. In this case, adjacent surface elements on the circumference of the thrust ring can have the same orientation of the inclination or can alternately be inclined in opposite directions to one another.
- the invention takes advantage of the fact that hitherto has not been taken into account and not recognized in the design of pusher centrifuges, that with each dewatering in the centrifugal field a capillary layer is formed which is dependent on the granulometry and which can be several millimeters thick and which influences the residual moisture content of the centrifugal material. Characterized in that the inclined surface elements the centrifugal material in addition to the movement component in the axial direction If a transverse component is given to the outlet in the circumferential direction, the bottom layer of the centrifugal goods cake is destroyed by shearing action and released for further drainage.
- the degree of dewatering of the centrifuged material on the transport route from the entry to the discharge can thus be increased without changing the operating parameters of the centrifuge, or the amount of the dewatered centrifuged material which has been passed through can be increased or the speed can be reduced and the wear can be reduced will.
- the pusher centrifuge shown in FIGS. 1 and 2 in perspective and in section has a centrifugal unit consisting of two rotatable, approximately cylindrical sieve drums 1 and 2, a centrifuge housing 3 surrounding them, one against the Centrifugal unit adjacent to the outlet end containing a gaseous medium, e.g. air, solid space 4, a feed line 5 for the centrifuged material to be dewatered, a solids outlet 6, and a liquid space 7 for the centrifugal unit inlet 9 opening at the inner end of the centrifugal unit near a co-rotating sliding floor 8 ejected liquid.
- a gaseous medium e.g. air, solid space 4
- the inner screening drum 1 is mounted on a shaft 10, by means of which they can be set in rotation at a certain speed.
- the shaft 10 is displaceable in the axial direction and, with the aid of a drive device (not shown), is able to perform an oscillating movement in the axial direction with a certain amplitude in addition to its rotation.
- the outer screening drum 2 is fastened to a hollow shaft 11 with which it can also be rotated, but without an oscillating movement in the axial direction.
- the speed of the two drums 1 and 2 is usually identical.
- the centrifugal material to be dewatered is introduced into the interior of the innermost sieve drum 1 immediately afterwards through the feed pipe 5 and flows there radially outwards onto the sieve drum 1, where the dewatering process begins.
- the partially dewatered centrifuged material is transported by the oscillating sieve drum 1 in the direction of the adjoining outer sieve drum 2 and is further dewatered in the process. Additional centrifugal material to be dewatered is now continuously through the inlet pipe 5 delivered later.
- the outer edge of the push floor 8 thus acts as the first push ring.
- the inclination of the thrust surfaces 12 is advantageously between 30 ° and 60 °, for example 45 °. With such thrust surfaces it is achieved that the centrifugal material additionally receives a movement component in the circumferential direction when the sieve drums 1 and 2 oscillate against one another. This is obviously the directly on the interior surface of the sieve drum 2 under the action of the continuous feed impulses forming and preventing the passage of filtrate, the capillary layer is torn open and largely eliminated, so that a larger amount of filtrate can pass through with the same centrifugal force and the dewatering performance is significantly improved.
- the invention has been described above using a pusher centrifuge with two sieve drums and additional thrust segments on the edge of the inner sieve drum. It goes without saying that the push segments according to the invention with an analog advantage can also be provided for push centrifuges with a different number of drums, for example for push centrifuges with more than two sieve drums on the outer edges of the respective inner sieve drums. Thrust segments can also be arranged on the outer edge of the sliding floor.
- the thrust segments are not designed as flat surfaces inclined at approximately 45 ° to the axis, as shown in the example described, but in a suitable other form, as shown for example in FIGS. 3a-3d.
- the push surfaces can be flat surfaces (FIGS. 3a and 3b) or have a curvature (FIGS. 3c and 3d).
- the thrust surfaces on the thrust ring can all be inclined in the same direction (FIGS. 3a and 3c), or neighboring thrust surfaces may alternately have an opposite inclination (FIGS. 3b and 3d).
- the surface elements can also be formed by a suitable design of the thrust edge of the corresponding sieve drum, for example by designing the edge 1 'with sawtooth-shaped notches 12', as shown in FIG. 3a.
- the notches can be milled directly into the edge of the sieve drum, or they can be formed by triangular segments placed on the edge, for example screwed on. The latter has the advantage that when the edge is inevitably worn, the segments can be easily replaced and no reworking of the edge is required, so that the push centrifuge is particularly easy to maintain and can always be operated with optimum performance without great effort.
Landscapes
- Centrifugal Separators (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH834/88 | 1988-03-07 | ||
| CH834/88A CH675374A5 (fr) | 1988-03-07 | 1988-03-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0331924A2 true EP0331924A2 (fr) | 1989-09-13 |
| EP0331924A3 EP0331924A3 (en) | 1990-03-21 |
| EP0331924B1 EP0331924B1 (fr) | 1992-12-23 |
Family
ID=4196283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89102291A Expired - Lifetime EP0331924B1 (fr) | 1988-03-07 | 1989-02-10 | Centrifugeuse à poussoir |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4889627A (fr) |
| EP (1) | EP0331924B1 (fr) |
| JP (1) | JPH0624648B2 (fr) |
| CN (1) | CN1017407B (fr) |
| BR (1) | BR8900818A (fr) |
| CH (1) | CH675374A5 (fr) |
| DE (2) | DE3810565C1 (fr) |
| ES (1) | ES2037888T3 (fr) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH679016A5 (fr) * | 1989-09-29 | 1991-12-13 | Escher Wyss Ag | |
| AU3228693A (en) * | 1991-11-27 | 1993-06-28 | Baker Hughes Incorporated | Feed accelerator system including feed slurry accelerating nozzle apparatus |
| US5380266A (en) * | 1991-11-27 | 1995-01-10 | Baker Hughes Incorporated | Feed accelerator system including accelerator cone |
| US5401423A (en) * | 1991-11-27 | 1995-03-28 | Baker Hughes Incorporated | Feed accelerator system including accelerator disc |
| EP0618845B1 (fr) * | 1991-12-31 | 1998-09-02 | Baker Hughes Incorporated | Accelerateur d'alimentation comportant une aube d'acceleration |
| US5948256A (en) * | 1997-08-22 | 1999-09-07 | Baker Hughes Incorporated | Centrifuge with cake churning |
| ES2800499T3 (es) | 2014-02-26 | 2020-12-30 | Ferrum Ag | Centrífuga así como procedimiento para cargar una centrífuga |
| EP2959977B1 (fr) * | 2014-06-24 | 2018-10-03 | Ferrum AG | Centrifugeuse à poussoir double ainsi que système de plancher coulissant |
| KR102504657B1 (ko) * | 2019-11-18 | 2023-02-27 | 주식회사 엘지화학 | 가압 원심 탈수기 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1065333B (de) * | 1959-09-10 | Gebr. Heine, Viersen (RhId.) | Kontinuierlich arbeitende Siebzentrifuge mit einem gegenüber der Siebtrommel vor- oder nacheilend umlaufenden Boden | |
| DE1089686B (de) * | 1958-06-06 | 1960-09-22 | Karl Marx Stadt Maschf | Schubzentrifuge mit konischer Schleudertrommel |
| DE1120379B (de) * | 1959-06-13 | 1961-12-21 | Julius Von Roetel | Kontinuierlich arbeitende Siebzentrifuge |
| FR1295577A (fr) * | 1961-04-28 | 1962-06-08 | Filtres centrifuges | |
| DE1219407B (de) * | 1961-04-28 | 1966-06-16 | Toru Iono | Schubzentrifuge |
| DE2407833A1 (de) * | 1974-02-19 | 1975-08-21 | Eberhard Dipl Ing Simon | Schub- schaelschleuder zur abtrennung von feststoffen aus suspensionen |
| CH624858A5 (fr) * | 1977-11-25 | 1981-08-31 | Escher Wyss Ag | |
| CH627376A5 (de) * | 1977-12-07 | 1982-01-15 | Escher Wyss Ag | Zentrifuge mit einem ein gasfoermiges medium enthaltenden feststoffraum. |
-
1988
- 1988-03-07 CH CH834/88A patent/CH675374A5/de not_active IP Right Cessation
- 1988-03-29 DE DE3810565A patent/DE3810565C1/de not_active Expired
-
1989
- 1989-02-10 EP EP89102291A patent/EP0331924B1/fr not_active Expired - Lifetime
- 1989-02-10 ES ES198989102291T patent/ES2037888T3/es not_active Expired - Lifetime
- 1989-02-10 DE DE8989102291T patent/DE58903062D1/de not_active Expired - Fee Related
- 1989-02-23 BR BR898900818A patent/BR8900818A/pt not_active IP Right Cessation
- 1989-02-23 US US07/314,195 patent/US4889627A/en not_active Expired - Fee Related
- 1989-03-07 CN CN89101210.9A patent/CN1017407B/zh not_active Expired
- 1989-03-07 JP JP1053075A patent/JPH0624648B2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CH675374A5 (fr) | 1990-09-28 |
| US4889627A (en) | 1989-12-26 |
| DE58903062D1 (de) | 1993-02-04 |
| CN1036714A (zh) | 1989-11-01 |
| EP0331924B1 (fr) | 1992-12-23 |
| DE3810565C1 (fr) | 1989-07-13 |
| BR8900818A (pt) | 1989-10-17 |
| JPH01274856A (ja) | 1989-11-02 |
| CN1017407B (zh) | 1992-07-15 |
| EP0331924A3 (en) | 1990-03-21 |
| JPH0624648B2 (ja) | 1994-04-06 |
| ES2037888T3 (es) | 1993-07-01 |
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