EP0331924B1 - Schubzentrifuge - Google Patents

Schubzentrifuge Download PDF

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Publication number
EP0331924B1
EP0331924B1 EP89102291A EP89102291A EP0331924B1 EP 0331924 B1 EP0331924 B1 EP 0331924B1 EP 89102291 A EP89102291 A EP 89102291A EP 89102291 A EP89102291 A EP 89102291A EP 0331924 B1 EP0331924 B1 EP 0331924B1
Authority
EP
European Patent Office
Prior art keywords
sieve
drum
drums
sieve drum
surface elements
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
Application number
EP89102291A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0331924A3 (en
EP0331924A2 (de
Inventor
Bernd Hoppe
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.)
Sulzer Escher Wyss AG
Original Assignee
Sulzer Escher Wyss AG
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 Sulzer Escher Wyss AG filed Critical Sulzer Escher Wyss AG
Publication of EP0331924A2 publication Critical patent/EP0331924A2/de
Publication of EP0331924A3 publication Critical patent/EP0331924A3/de
Application granted granted Critical
Publication of EP0331924B1 publication Critical patent/EP0331924B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 inner and one outer, rotatable in a housing with identical speed, at least approximately cylindrical sieve drum, wherein the sieve drums perform an oscillating movement in the axial direction relative to each other, and one end of the interior of the sieve drums dewatering centrifugal material can be fed, and with at least one co-rotating sliding floor, which is able to execute an oscillating movement in the axial direction of the sieve drums while transporting the at least partially dewatered centrifugal material on the inside of the sieve drums in the direction of a solids outlet provided at the other end of the sieve drums, whereby on the outlet side edge a push ring is provided for at least one inner sieve drum.
  • 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, which is fed to the inner end of a centrifugal space via a feed pipe and is successively dewatered on the inside of the sieve drums .
  • the centrifugal material is gradually transported in the direction of a solid material outlet by the axially oscillating movement of the push floor and one or more push rings, and at the same time non-drained centrifugal material is refilled in the vicinity of the push floor.
  • Such a pusher centrifuge has 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 drum can oscillate in a two-stage pusher centrifuge, the second drum in a three-stage centrifuge, and the first and third drums in a four-stage 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. Improvement could be achieved by increasing the dewatering time, which, however, 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 in addition the solid cake is even more compact and therefore still more becomes more impermeable.
  • the invention has for its object to increase the degree of dewatering of a pusher centrifuge of the type mentioned and to reduce the residual moisture content of the discharged solid without changing the operating parameters of the centrifuge and without a complicated construction.
  • this object is achieved in that the thrust ring is provided with surface elements which are oriented obliquely to the axis of the sieve drum and, in the oscillating movement of the sieve drum relative to the following sieve drum, impart an additional movement component in the circumferential direction of the sieve drums to the items to be transported in the axial direction.
  • the surface elements can be provided on the edge of an inner sieve drum, which is able to oscillate axially relative to an outer sieve drum, or else on the edge of a non-oscillating drum, the lateral movement or shearing action being provided by the following oscillating drum.
  • the surface elements can be flat surfaces that form an angle with the axis of the screening drum approximately between 30 o and 60 o , 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 makes use of the fact that has apparently 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. Because the inclined surface elements give the centrifugal material a transverse component in the circumferential direction in addition to the movement component in the axial direction towards the outlet, the bottom layer of the centrifugal product cake is destroyed by shearing action and released for further dewatering.
  • 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 surrounding centrifuge housing 3, a gaseous medium adjacent to the centrifugal unit at the outlet end, e.g. Air containing solids space 4, at the inner end of the centrifugal unit near a co-rotating moving floor 8 with a centrifugal material inlet 9 opening supply line 5 for the centrifuged material to be dewatered, a solids outlet 6, and a liquid space 7 for the ejected liquid.
  • a centrifugal unit consisting of two rotatable, approximately cylindrical sieve drums 1 and 2, a surrounding centrifuge housing 3, a gaseous medium adjacent to the centrifugal unit at the outlet end, e.g. Air containing solids space 4, at the inner end of the centrifugal unit near a co-rotating moving floor 8 with a centrifugal material inlet 9 opening
  • the inner screening drum 1 is mounted on a shaft 10, by means of which it 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 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 centrifugal material is transported through the moving floor 8 and via 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 supplied through the inlet pipe 5.
  • the partially dewatered centrifugal material reaches the end of the inner sieve drum 1, it is transported from its edge, which acts as a thrust ring, to the outer centrifugal drum 2 and is further dewatered there.
  • the completely dewatered centrifuged material is transported through the relative oscillation of the two sieve drums 1 and 2 to the solids space 4, which it leaves via the solids outlet 6.
  • the inclination of the thrust surfaces 12 is advantageously between 30 o and 60 o , for example 45 o .
  • the centrifugal material additionally receives a movement component in the circumferential direction when the sieve drums 1 and 2 oscillate against one another. This apparently tears open and largely eliminates the capillary layer which forms directly on the inner surface of the screen drum 2 under the action of the constant feed impulses and prevents the filtrate from penetrating, 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 can also be provided with an analog advantage in push centrifuges with a different number of drums, for example in push centrifuges with more than two sieve drums, on the outer edges of the respective inner sieve drums.
  • the thrust segments are not as shown in the example described is formed as below about 45 ° inclined relative to the axis of flat surfaces, but in a suitable other shape, as shown for example in Figures 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 screening 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 by placing them on the edge, e.g. screwed triangular segments can be formed.
  • 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)
EP89102291A 1988-03-07 1989-02-10 Schubzentrifuge Expired - Lifetime EP0331924B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH834/88 1988-03-07
CH834/88A CH675374A5 (ja) 1988-03-07 1988-03-07

Publications (3)

Publication Number Publication Date
EP0331924A2 EP0331924A2 (de) 1989-09-13
EP0331924A3 EP0331924A3 (en) 1990-03-21
EP0331924B1 true EP0331924B1 (de) 1992-12-23

Family

ID=4196283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102291A Expired - Lifetime EP0331924B1 (de) 1988-03-07 1989-02-10 Schubzentrifuge

Country Status (8)

Country Link
US (1) US4889627A (ja)
EP (1) EP0331924B1 (ja)
JP (1) JPH0624648B2 (ja)
CN (1) CN1017407B (ja)
BR (1) BR8900818A (ja)
CH (1) CH675374A5 (ja)
DE (2) DE3810565C1 (ja)
ES (1) ES2037888T3 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH679016A5 (ja) * 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
AU3324793A (en) * 1991-12-31 1993-07-28 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5948256A (en) * 1997-08-22 1999-09-07 Baker Hughes Incorporated Centrifuge with cake churning
EP2913112B1 (de) * 2014-02-26 2020-06-17 Ferrum AG Zentrifuge, sowie Verfahren zur Beladung einer Zentrifuge
ES2698377T3 (es) * 2014-06-24 2019-02-04 Ferrum Ag Centrífuga de doble empujador así como dispositivo de base de empujador
KR102504657B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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
DE1219407B (de) * 1961-04-28 1966-06-16 Toru Iono Schubzentrifuge
FR1295577A (fr) * 1961-04-28 1962-06-08 Filtres centrifuges
DE2407833A1 (de) * 1974-02-19 1975-08-21 Eberhard Dipl Ing Simon Schub- schaelschleuder zur abtrennung von feststoffen aus suspensionen
CH624858A5 (ja) * 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.

Also Published As

Publication number Publication date
CN1036714A (zh) 1989-11-01
CH675374A5 (ja) 1990-09-28
CN1017407B (zh) 1992-07-15
DE58903062D1 (de) 1993-02-04
JPH0624648B2 (ja) 1994-04-06
EP0331924A3 (en) 1990-03-21
BR8900818A (pt) 1989-10-17
US4889627A (en) 1989-12-26
EP0331924A2 (de) 1989-09-13
JPH01274856A (ja) 1989-11-02
ES2037888T3 (es) 1993-07-01
DE3810565C1 (ja) 1989-07-13

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