EP0421188A1 - Centrifugeuse à poussoir - Google Patents

Centrifugeuse à poussoir Download PDF

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Publication number
EP0421188A1
EP0421188A1 EP90118002A EP90118002A EP0421188A1 EP 0421188 A1 EP0421188 A1 EP 0421188A1 EP 90118002 A EP90118002 A EP 90118002A EP 90118002 A EP90118002 A EP 90118002A EP 0421188 A1 EP0421188 A1 EP 0421188A1
Authority
EP
European Patent Office
Prior art keywords
sieve
shaft
drums
ring
drum
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
Application number
EP90118002A
Other languages
German (de)
English (en)
Other versions
EP0421188B1 (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
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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 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 push ring between two sieve drums, which has an oscillating movement in the axial direction of the sieve drums for feeding the partially dewatered centrifugal material on the inside the following sieve drum in the direction of a solids outlet.
  • Such pusher centrifuges are known from CH 624 858 and CH 627 376 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 is moved in the axial direction oscillating movement of one or more push rings between adjacent sieve drums is gradually advanced towards a solids outlet, and at the same time non-dewatered 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 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 the feed up to the discharge.
  • the solid cake formed becomes increasingly compact and therefore impermeable, so that the degree of drainage and the residual moisture of the discharged solid is not optimal for certain centrifugal goods and requires an extension of the dewatering time and an increased speed and a high energy consumption.
  • the invention has for its object to avoid the aforementioned disadvantages of the prior art and to create a push centrifuge with an increased degree of dewatering and lower residual moisture of the discharged solid, which is also suitable for dewatering particularly sensitive centrifugal material without the occurrence of grain breakage and abrasion.
  • 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 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 inevitably with a displacement of the two screen drums 1 and 2 relative to each other in the axial direction or with a relative movement of the inner shaft 10 relative to the hollow shaft 11, the inner screen drum 1 and especially its thrust ring 1 'in addition to the feed movement, a rotary movement by a certain angle executes.
  • 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 introduced into the interior of the innermost sieve drum 1 immediately afterwards on the push floor 8 and flows there radially outwards onto the sieve drum 1, where the dewatering process begins.
  • the partially dewatered centrifugal material is advanced 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 supplied through the feed line 5.
  • the degree of rotation 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.
  • NaHCO3 was at a speed of 1400 revolutions / minute and 75 strokes of the thrust ring of 60 mm amplitude per minute selected a rotation of approx. 8 ° 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 usually results in a gentler treatment of the centrifuged material, which is particularly important for fragile, e.g. with acicular crystals is an advantage.
  • the additional rotary movement of the thrust ring can also be provided counter to the drum rotation.
  • a particularly gentle treatment of the centrifuged material is carried out here.
  • this can be on its surface be provided with a certain microroughness, as is shown schematically in FIG. 3b.
  • An even better entrainment results from a surface structure of the thrust ring 1 'which deviates from a smooth circular ring surface, for example by providing radially extending grooves 15 on the thrust ring, as shown in FIG. 3c.
  • the edge of the thrust ring 1 'can also be provided according to FIG. 3d with prongs 16 with inclined thrust surfaces, whereby the loosening of the centrifuged cake and the degree of dewatering can be increased.
  • 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)
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
CH3531/89A CH679016A5 (fr) 1989-09-29 1989-09-29
CH3531/89 1989-09-29

Publications (2)

Publication Number Publication Date
EP0421188A1 true EP0421188A1 (fr) 1991-04-10
EP0421188B1 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
ATE397496T1 (de) * 2003-04-16 2008-06-15 Ferrum Ag Schubzentrifuge mit rotierbarem trichter zur vorbeschleunigung des gemisches
KR100875704B1 (ko) 2007-06-29 2008-12-23 (주)현보산업 탈수조 및 이를 이용한 탈수장치
TR201818787T4 (tr) * 2014-06-24 2019-01-21 Ferrum Ag Çift İticili Santrifüj Ve İtici Taban Donanımı
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
KR102504659B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기
KR102504657B1 (ko) * 2019-11-18 2023-02-27 주식회사 엘지화학 가압 원심 탈수기

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1060795B (de) * 1958-03-21 1959-07-02 Krauss Maffei Ag Schubzentrifuge, insbesondere fuer langfaserige Schleudergueter
DE3810565C1 (fr) * 1988-03-07 1989-07-13 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De

Family Cites Families (4)

* 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
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1060795B (de) * 1958-03-21 1959-07-02 Krauss Maffei Ag Schubzentrifuge, insbesondere fuer langfaserige Schleudergueter
DE3810565C1 (fr) * 1988-03-07 1989-07-13 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De

Also Published As

Publication number Publication date
CH679016A5 (fr) 1991-12-13
DE59003454D1 (de) 1993-12-16
CN1023383C (zh) 1994-01-05
JPH03118854A (ja) 1991-05-21
DE3941505C1 (fr) 1990-12-13
US5205933A (en) 1993-04-27
EP0421188B1 (fr) 1993-11-10
CN1050688A (zh) 1991-04-17
ES2047225T3 (es) 1994-02-16

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