EP0421188B1 - Centrifugeuse à poussoir - Google Patents

Centrifugeuse à poussoir Download PDF

Info

Publication number
EP0421188B1
EP0421188B1 EP90118002A EP90118002A EP0421188B1 EP 0421188 B1 EP0421188 B1 EP 0421188B1 EP 90118002 A EP90118002 A EP 90118002A EP 90118002 A EP90118002 A EP 90118002A EP 0421188 B1 EP0421188 B1 EP 0421188B1
Authority
EP
European Patent Office
Prior art keywords
pusher
straining
shaft
drum
drums
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
EP90118002A
Other languages
German (de)
English (en)
Other versions
EP0421188A1 (fr
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
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, Escher Wyss AG filed Critical Sulzer Escher Wyss AG
Publication of EP0421188A1 publication Critical patent/EP0421188A1/fr
Application granted granted Critical
Publication of EP0421188B1 publication Critical patent/EP0421188B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 two rotating sieve drums in a housing, in the interior of which centrifugal material can be fed at one end, and with at least one annular thrust ring at the edge of one of the sieve drums, which has an oscillating movement in the axial direction of the sieve drums for feeding the partially dewatered centrifuged material on the inside of each subsequent drum towards a solids outlet.
  • Such pusher centrifuges are known from DE-C-38 10 565 and are used for the continuous dewatering of centrifuged 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 centrifuged material by the axially oscillating movement of one or more thrust rings between adjacent sieve drums gradually advanced towards a solids outlet, and at the same time non-dewatered centrifugal material is refilled in the vicinity of the thrust 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 in a two-stage centrifuge, the drum, in a three-stage centrifuge, the moving floor and the second drum, and in a four-stage centrifuge, the first and third drums can oscillate in the axial direction.
  • Such a pusher centrifuge enables continuous dewatering of a centrifugal material, which is gradually dewatered in the centrifugal field from the centrifugal material inlet to the solids outlet during the feed on the inside of the sieve drums and reaches the solids outlet in a largely dewatered state, while the filtrate reaches the outside through the sieve drums penetrates and is discharged there.
  • a cake layering is formed on such push centrifuges on the sieve drums, which does not change significantly during feed until ejection.
  • the solid cake formed becomes increasingly compact and therefore impermeable, so that the degree of dewatering and the residual moisture of the discharged solid contribute certain centrifugal goods is not yet optimal and requires an extension of the dewatering time and an increased speed and a high energy consumption.
  • a single-stage pusher centrifuge is known from DE-B-1 060 795, in which the pusher floor is additionally rotated relative to the screen drum during the forward stroke. A shear movement is only exerted on the freshly supplied, still largely liquid suspension, which, however, does not improve the dewatering of the already partially dewatered filter cake.
  • the invention has for its object to avoid the aforementioned disadvantages of the prior art and to create a pusher centrifuge with an increased degree of dewatering and lower residual moisture of the discharged solid, which also Drainage of particularly sensitive centrifugal material without grain breakage and abrasion is suitable.
  • this object is achieved in that a rotating device is provided, by means of which the thrust ring simultaneously executes a rotary movement about the axis direction of the sieve drums during the feed, the thrust ring having a rough surface structure.
  • the solid cake Due to this additional rotary movement of the thrust ring during the feed process, the solid cake is very gently carried along and loosened by the lateral movement in the circumferential direction, so that the dewatering performance is improved.
  • this loosening can be carried out so gently that grain breakage is largely avoided.
  • the rough surface of the push ring ensures that the cake is carried particularly gently, e.g. depending on the material due to micro-roughness or radial grooves on the surface.
  • the rotary movement can also take place in an oscillating manner, so that turning back and loosening also take place when withdrawing, which can be effected in a simple manner with a screw guide of the corresponding sieve drum shafts against one another.
  • the relative rotary movement of the thrust ring can moreover be directed in the direction of rotation of the sieve drums, which can be advantageous in the case of fragile crystals, or else opposite to this direction of rotation.
  • the latter can be important for mixtures that are difficult to filter or low solids concentrations in the centrifuged material.
  • the pusher centrifuge shown in FIGS. 1 and 2 in perspective and in section has a centrifugal unit consisting of two rotatable sieve drums 1 and 2, a stationary centrifuge housing 3 surrounding it, a solid space 4 adjacent to the centrifugal unit at the outlet, and one close to the inner end of the centrifugal unit a moving floor 8 with a centrifugal material inlet 9 leading supply line 5 for the centrifuged material to be dewatered, a solids outlet 6, and a liquid space 7 for the ejected liquid.
  • 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. At the same time, the shaft 10 can be displaced in the axial direction A and, in addition to its rotation, can also perform an oscillating movement in the axial direction with a certain amplitude.
  • the outer screening drum 2 is fastened to a hollow shaft 11, with which it can also be set in rotation, but without an oscillating movement in the axial direction.
  • the shaft 10 of the inner sieve drum is connected to the hollow shaft 11 of the outer sieve drum by means of a screw guide 12.
  • this consists of a number of helically shaped grooves 13 on the outside of the shaft 10, in which a number of cams 14 engage on the inside of the hollow shaft 11.
  • This has the effect that when the two screening drums 1 and 2 are displaced relative to one another in the axial direction or when the inner shaft 10 moves relative to the hollow shaft 11, the inner screening drum 1 and especially its edge acting as a thrust ring 1 'also undergo a rotary movement in addition to the feed movement executes a certain angle.
  • the grooves can also be provided on the outside of the shaft and the cams on the inside of the hollow shaft.
  • the push centrifuge described is operated as follows: through the feed pipe 5, the centrifugal material to be dewatered is fed into the interior of the innermost Screen drum 1 is then introduced directly into the sliding floor 8 and flows there radially outward onto the screen drum 1, where the dewatering process begins.
  • the partially dewatered centrifugal material is advanced through 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 feed line 5.
  • the cake Due to the relative rotary movement of the thrust ring 1 'about the axis A in the circumferential direction with respect to the outer sieve drum 2, the cake, which has already been partially dewatered, is taken along a little by the thrust ring and loosened gently, so that the still bound coarse capillary and gusset liquid of the partially dewatered cake is exposed without provoking a grain break, so that the drainage is significantly improved.
  • the movement along a helix has a greater drainage effect because of the somewhat longer length.
  • the washing effect of loosened cakes is also significantly improved.
  • the formation of unbalance in the centrifuge is avoided because the cake is reshaped with every turning stroke and is thus balanced.
  • the degree of twisting in the circumferential direction with a full stroke of the thrust ring must be matched to the centrifuged material to be processed and selected in accordance with the need for protection and the risk of grain breakage when loosening the partially dewatered cake.
  • a rotation of approximately 8 ° was chosen at a speed of 1400 revolutions / minute and 75 strokes of the thrust ring per minute of 60 mm amplitude for each stroke.
  • the degree of drainage of the NaHCO3 at the solids outlet was improved from approximately 13% to approximately 12% without increasing the speed, without disturbing grain breakage occurring. This means a reduction in the liquid content of almost 8%.
  • the additional rotary movement of the thrust ring can be carried out in the same direction as the rotation of the sieve drums, which generally results in a gentler treatment of the centrifuged material, which is particularly advantageous in the case of fragile, for example needle-shaped, crystals. With less sensitive centrifugal material, however, the additional rotary movement of the thrust ring can also be provided counter to the drum rotation.
  • the thrust ring 1 'could indeed be designed with a relatively smooth surface, as shown in FIG. 3a, the shear movement of the centrifuged material being effected solely by the sliding friction occurring during the additional rotary movement.
  • the treatment of the centrifuged material would be particularly gentle here, but it is often not sufficient to take it with you.
  • this is provided with a certain micro-roughness 17 on its surface, as shown schematically in FIG. 3b.
  • Analogous relationships apply to more than two-stage pusher centrifuges.
  • the push floor and the second sieve drum can oscillate synchronously in the axial direction and at the same time perform a rotary movement, in the case of four-stage centrifuges, however, the first and third drums.

Landscapes

  • Centrifugal Separators (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (7)

  1. Centrifugeuse poussante avec au moins deux tambours filtrants (1, 2) tournant dans un boîtier (3), dans l'espace intérieur desquels de la matière à centrifuger peut être introduite à une extrémité, et avec au moins un anneau pousseur (1') en forme d'anneau circulaire sur le bord d'un des tambours filtrants (1, 2), qui exécute un mouvement oscillant dans le sens axial des tambours filtrants pour faire avancer la matière partiellement déshydratée sur la face intérieure du tambour filtrant (2) suivant, en direction d'un passage (6) d'évacuation des solides,
    caractérisée en ce qu'il est prévu un dispositif (12, 13, 14) d'entraînement en rotation, au moyen duquel l'anneau pousseur (1') exécute simultanément pendant le mouvement d'avance un mouvement de rotation autour de la direction axiale (A) des tambours filtrants (1, 2), tandis que l'anneau pousseur (1') présente une structure de surface rugueuse.
  2. Centrifugeuse poussante selon la revendication 1, caractérisée en ce que l'anneau pousseur (1') présente sur sa surface annulaire une micro-rugosité (17).
  3. Centrifugeuse poussante selon la revendication 1, caractérisée en ce que l'anneau pousseur (1') présente sur sa surface annulaire des rayures radiales (15, 16).
  4. Centrifugeuse poussante selon une des revendications 1 à 3, caractérisée en ce que le dispositif d'entraînement en rotation (12, 13, 14) est agencé de manière à exécuter pendant le rappel en arrière de l'anneau pousseur (1') une rotation en sens inverse des tambours filtrants (1, 2), l'un par rapport à l'autre.
  5. Centrifugeuse poussante selon la revendication 4, caractérisée en ce que le dispositif d'entraînement en rotation présente un guidage hélicoïdal (13, 14) pour l'arbre (10) du tambour filtrant (1) portant l'anneau pousseur (1').
  6. Centrifugeuse poussante selon la revendication 5, caractérisée en ce que le guidage hélicoïdal (12) est prévu entre l'arbre (10) du tambour filtrant (1) et l'arbre (11) du tambour filtrant suivant (2) et présente des rainures hélicoïdales (13) sur l'arbre (10) et des ergots (14) sur l'autre arbre (11).
  7. Centrifugeuse poussante selon la revendication 6, caractérisée en ce que les rainures hélicoïdales (13) sont prévues sur le côté extérieur de l'arbre (10) du tambour filtrant (1) portant l'anneau pousseur (1) et les ergots (14) sont prévus sur le côté intérieur de l'arbre (11) du tambour filtrant suivant (2), ledit arbre (11) étant un arbre creux.
EP90118002A 1989-09-29 1990-09-19 Centrifugeuse à poussoir Expired - Lifetime EP0421188B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3531/89 1989-09-29
CH3531/89A CH679016A5 (fr) 1989-09-29 1989-09-29

Publications (2)

Publication Number Publication Date
EP0421188A1 EP0421188A1 (fr) 1991-04-10
EP0421188B1 true EP0421188B1 (fr) 1993-11-10

Family

ID=4258006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118002A Expired - Lifetime EP0421188B1 (fr) 1989-09-29 1990-09-19 Centrifugeuse à poussoir

Country Status (7)

Country Link
US (1) US5205933A (fr)
EP (1) EP0421188B1 (fr)
JP (1) JPH03118854A (fr)
CN (1) CN1023383C (fr)
CH (1) CH679016A5 (fr)
DE (2) DE3941505C1 (fr)
ES (1) ES2047225T3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1468744B1 (fr) * 2003-04-16 2008-06-04 Ferrum AG Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange
KR100875704B1 (ko) 2007-06-29 2008-12-23 (주)현보산업 탈수조 및 이를 이용한 탈수장치
ES2698377T3 (es) * 2014-06-24 2019-02-04 Ferrum Ag Centrífuga de doble empujador así como dispositivo de base de empujador
CN105561658B (zh) * 2014-10-14 2018-09-14 中国石油化工股份有限公司 熔融结晶悬浮液的分离纯化设备和方法
JP6618433B2 (ja) * 2016-07-05 2019-12-11 月島機械株式会社 遠心分離装置および遠心分離方法
CN108325758B (zh) * 2018-04-10 2024-05-03 巨能机械(中国)有限公司 一种沉降过滤式活塞推料离心机
CN110584446A (zh) * 2018-06-12 2019-12-20 佛山市顺德区美的电热电器制造有限公司 送料控制方法、物料存储装置、烹饪器具及存储介质
KR102504657B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
KR102504659B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1044721B (de) * 1956-04-04 1958-11-20 Krauss Maffei Ag Schubzentrifuge mit einer stufenfoermigen Siebtrommel
DE1060795B (de) * 1958-03-21 1959-07-02 Krauss Maffei Ag Schubzentrifuge, insbesondere fuer langfaserige Schleudergueter
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.
JPH0635675B2 (ja) * 1984-07-30 1994-05-11 大塚化学株式会社 電気メツキ用樹脂組成物
CH675374A5 (fr) * 1988-03-07 1990-09-28 Escher Wyss Ag

Also Published As

Publication number Publication date
CH679016A5 (fr) 1991-12-13
JPH03118854A (ja) 1991-05-21
DE3941505C1 (fr) 1990-12-13
US5205933A (en) 1993-04-27
EP0421188A1 (fr) 1991-04-10
CN1050688A (zh) 1991-04-17
ES2047225T3 (es) 1994-02-16
CN1023383C (zh) 1994-01-05
DE59003454D1 (de) 1993-12-16

Similar Documents

Publication Publication Date Title
DE2063516C3 (de) Trommelsiebvorrichtung fur Faserstoff suspen sionen
DE2930581A1 (de) Zentrifuge zum sortieren und trennen von feststoffen
DE69811014T2 (de) Zentrifuge mit heftig bewegtem Feststoffkuchen
EP1468744B1 (fr) Centrifugeuse à poussoir avec cone rotatif pour pre-accélerer le mélange
DE2413949A1 (de) Trommelsiebvorrichtung fuer faserstoffsuspensionen
EP0421188B1 (fr) Centrifugeuse à poussoir
DE963855C (de) Schubzentrifuge mit mindestens zwei koaxial zueinander angeordneten Schleudertrommeln
DE3301099C2 (fr)
EP0643999B1 (fr) Dispositif de tamisage
DE2718673A1 (de) Verfahren und vorrichtung zum entwaessern von schlamm
DE3810565C1 (fr)
EP2913112B1 (fr) Centrifugeuse et procédé de chargement d'une centrifugeuse
DE3217824C2 (de) Rotor für Sortierer zur Reinigung von Fasersuspensionen, insbesondere aus Altpapier
DE1632291B1 (de) Kontinuierlich arbeitende Siebzentrifuge
EP0068095B1 (fr) Centrifugeuse à poussoir
DE1119774B (de) Schubzentrifuge mit Waschvorrichtung fuer das geschleuderte Gut
DD232844A5 (de) Verfahren und vorrichtung zum trennschleudern von feinkornmineralgemischen
WO2002011853A1 (fr) Dispositif d'extraction permettant l'extraction de liquide a partir de corps solides, et son utilisation
AT384562B (de) Siebtrommel
AT518275B1 (de) Schneckenzentrifuge zur nassmechanischen trennung von feststoffen
DE2830744C2 (de) Mehrstufige Schubzentrifuge
DE2458564A1 (de) Schleudertrommel
EP1468743A1 (fr) Centrifugeuse-pousseuse
DE915799C (de) Kontinuierlich arbeitende Zentrifuge
DE951347C (de) Kontinuierlich arbeitende Sieb- oder Vollmantel-Zentrifuge mit einer oder mehreren zylindrischen oder konischen Trommeln, die sich um eine ausserhalb der Trommeln liegende gemeinsame Hauptachse drehen und ausserdem um ihre eigene Achse drehbar sind

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900919

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT NL

17Q First examination report despatched

Effective date: 19920430

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR GB IT NL

REF Corresponds to:

Ref document number: 59003454

Country of ref document: DE

Date of ref document: 19931216

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILA

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2047225

Country of ref document: ES

Kind code of ref document: T3

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940209

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19940815

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19940817

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19940819

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19940825

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19940915

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19940930

Year of fee payment: 5

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950919

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF THE APPLICANT RENOUNCES

Effective date: 19950920

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19950930

BERE Be: lapsed

Owner name: SULZER - ESCHER WYSS A.G.

Effective date: 19950930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19960401

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19950919

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960601

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19960401

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19991007

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050919