EP0688247B1 - Centrifugal drum for concentrating solids in suspension - Google Patents
Centrifugal drum for concentrating solids in suspension Download PDFInfo
- Publication number
- EP0688247B1 EP0688247B1 EP94919580A EP94919580A EP0688247B1 EP 0688247 B1 EP0688247 B1 EP 0688247B1 EP 94919580 A EP94919580 A EP 94919580A EP 94919580 A EP94919580 A EP 94919580A EP 0688247 B1 EP0688247 B1 EP 0688247B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channels
- solids
- suspension
- centrifugal bowl
- solid
- 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
- 239000007787 solid Substances 0.000 title claims abstract description 55
- 239000000725 suspension Substances 0.000 title claims abstract description 15
- 230000000630 rising effect Effects 0.000 claims abstract description 6
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 8
- 230000002411 adverse Effects 0.000 abstract description 2
- 239000007790 solid phase Substances 0.000 abstract 1
- 238000005352 clarification Methods 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 230000006735 deficit Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 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
- B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
- B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
Definitions
- the invention relates to a centrifugal drum for concentrating suspended solids with a peripheral solid space provided with discharge channels and a plate insert with risers, the inlet openings of which are connected to an inlet space of the centrifugal drum to which the suspension to be clarified is fed, with channels for discharging the center of the plate insert Clarified suspension are provided and the plate insert is connected at its periphery to the solids space, whereby the solids separated in the plate insert are guided into the solids space, and wherein the riser channels are provided with outlet openings, which via connecting channels and radially inwardly directed channel sections with outlet openings for separate Derivation of a partial stream containing solids are connected.
- Such a centrifugal drum is known for example from US-A-2478992.
- the product stream conducted from the riser channels into the connecting channels is completely discharged through the outlet openings.
- this product stream can still contain solids which, on the one hand, can adversely affect the product stream and, on the other hand, result in a lower yield in the case of the spun off solids.
- a centrifugal drum is known from DE 33 20 152 A1, in which the separated solids collect in the solids space and are continuously discharged through the discharge channels.
- the cross-section of the discharge channels must be dimensioned so that as little liquid as possible is discharged with the solids.
- the solid layer that forms in the solid space also grows radially inward until finally solids also enter the riser channels and are discharged with the clarified suspension flowing radially inward. This then undesirably affects the degree of clarification of the suspension.
- a compromise is therefore required between the maximum concentration of the solids and the optimal degree of clarification of the suspension.
- the present invention has for its object to develop the centrifugal drum so that no loss of solid substrate occurs even at high solids concentrations.
- connecting channels are connected to the solids space, the connecting channels being designed as clarifying gaps.
- connection channel designed as a clarifying gap
- Solid particles that enter the connection channel are separated and passed into the solid space. This results in an optimal separation of the product into three partial flows with a selective classification effect.
- the clarification gap is formed between a conical inner wall of the centrifugal drum and an outer wall of an intermediate plate arranged concentrically therewith and provided with spacer strips. This provides particularly generous sedimentation areas for the solids in the clarification gap, which can be further enlarged by plates provided in the clarification gap.
- the centrifugal drum 1 in the figure is the centrifugal drum, from whose solid space 2 discharge channels 3 extend.
- the centrifugal drum 1 is equipped with a plate insert 4, the risers 5 of which are connected to an inlet space 7 via their inlet openings 6.
- outlet openings 8 are provided which are connected to the solid space 2 via connecting channels 9.
- the connecting channels 9 are formed between an inner wall the centrifugal drum 1 and an outer wall of an intermediate plate 11 arranged concentrically therewith and provided with spacer strips 10 and have radially inwardly directed channel sections 12, the outlet openings 13 of which open into a peeling chamber 14 in which a peeling member 15 is provided.
- the solid-containing suspension is fed into the inlet space 7 via the inlet pipe 19 and passes through the inlet openings 6 into the risers 5 of the plate insert 4, in which the solid particles are separated.
- the clarified suspension flows to the center of the plate insert 4 and is discharged from the centrifugal drum 1 via the channels 16, the peeling chamber 17 and the peeling member 18.
- the separated solid particles first reach the solid space 2 via the periphery of the plate insert 4 before they are discharged via the drain channels 3.
- the cross section of the discharge channels 3 must be dimensioned in this way in order to achieve a high solids concentration be that as little liquid as possible is drained off with the solids. The higher the set concentration values, the further the solid space 2 fills radially inwards.
- the solid particles extend into the rising channels 5. These solid particles are led out of the plate insert 4 by means of a partial flow of the suspension fed into the rising channels 5, which is continuously drawn off via the channel section 12. Some of the solids are separated in the connecting channels 9, which are designed as clarifying gaps and provided with plates 20, and are returned to the solids space 2. The remaining solids are withdrawn from the drum 1 with the partial flow via the peeling member 15. This achieves a classification effect by which types of solids which are not desired in the solids concentrate can be removed separately. This is e.g. B. the case in the concentration of fiber-containing starch suspensions, in which the fibers in the starch concentrate are not desired.
Landscapes
- Centrifugal Separators (AREA)
- Filtration Of Liquid (AREA)
- Cyclones (AREA)
Abstract
Description
Die Erfindung betrifft eine Schleudertrommel zur Konzentrierung suspendierter Feststoffe mit einem peripheren, mit Ablaßkanälen versehenen Feststoffraum und einem Tellereinsatz mit Steigekanälen, deren Eintrittsöffnungen mit einem Einlaufraum der Schleudertrommel verbunden sind, dem die zu klärende Suspension zugeführt wird, wobei im Zentrum des Tellereinsatzes Kanäle zur Ableitung der geklärten Suspension vorgesehen sind und der Tellereinsatz an seiner Peripherie mit dem Feststoffraum in Verbindung steht, wodurch die im Tellereinsatz abgeschiedenen Feststoffe in den Feststoffraum geleitet werden, und wobei die Steigekanäle mit Austrittsöffnungen versehen sind, die über Verbindungskanäle und radial einwärts gerichtete Kanalabschnitte mit Auslaßöffnungen zur separaten Ableitung eines feststoffhaltigen Teilstromes verbunden sind.The invention relates to a centrifugal drum for concentrating suspended solids with a peripheral solid space provided with discharge channels and a plate insert with risers, the inlet openings of which are connected to an inlet space of the centrifugal drum to which the suspension to be clarified is fed, with channels for discharging the center of the plate insert Clarified suspension are provided and the plate insert is connected at its periphery to the solids space, whereby the solids separated in the plate insert are guided into the solids space, and wherein the riser channels are provided with outlet openings, which via connecting channels and radially inwardly directed channel sections with outlet openings for separate Derivation of a partial stream containing solids are connected.
Eine derartige Schleudertrommel ist beispielsweise aus der US-A-2478992 bekannt. Der aus den Steigekanälen in die Verbindungskanäle geleitete Produktstrom wird hierbei vollständig über die Auslaßöffnungen abgeleitet. Dieser Produktstrom kann aber noch Feststoffe enthalten, die einerseits den Produktstrom nachteilig beeinflussen können und andererseits eine geringere Ausbeute bei den abgeschleuderten Feststoffen bewirken.Such a centrifugal drum is known for example from US-A-2478992. The product stream conducted from the riser channels into the connecting channels is completely discharged through the outlet openings. However, this product stream can still contain solids which, on the one hand, can adversely affect the product stream and, on the other hand, result in a lower yield in the case of the spun off solids.
Aus der DE 33 20 152 A1 ist eine Schleudertrommel bekannt, bei der sich die abgeschiedenen Feststoffe im Feststoffraum sammeln und durch die Ablaßkanäle kontinuierlich ausgetragen werden. Um eine hohe Feststoffkonzentration zu erzielen, ist der Querschnitt der Ablaßkanäle so zu bemessen, daß möglichst wenig Flüssigkeit mit den Feststoffen ausgetragen wird. Mit zunehmender Feststoffkonzentration wächst allerdings auch die sich im Feststoffraum ausbildende Feststoffschicht radial einwärts bis schließlich Feststoffe auch in die Steigekanäle gelangen und mit der radial einwärts strömenden geklärten Suspension ausgetragen werden. Dadurch wird dann der Klärgrad der Suspension in unerwünschter Weise beeinträchtigt. Es ist also ein Kompromiß erforderlich zwischen der maximalen Konzentration der Feststoffe und dem optimalen Klärgrad der Suspension.A centrifugal drum is known from DE 33 20 152 A1, in which the separated solids collect in the solids space and are continuously discharged through the discharge channels. In order to achieve a high solids concentration, the cross-section of the discharge channels must be dimensioned so that as little liquid as possible is discharged with the solids. With increasing solids concentration, however, the solid layer that forms in the solid space also grows radially inward until finally solids also enter the riser channels and are discharged with the clarified suspension flowing radially inward. This then undesirably affects the degree of clarification of the suspension. A compromise is therefore required between the maximum concentration of the solids and the optimal degree of clarification of the suspension.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die Schleudertrommel so weiterzubilden, daß auch bei hohen Feststoffkonzentrationen kein Verlust an Feststoffsubstrat auftritt.The present invention has for its object to develop the centrifugal drum so that no loss of solid substrate occurs even at high solids concentrations.
Diese Aufgabe wird dadurch gelöst, daß die Verbindungskanäle mit dem Feststoffraum in Verbindung stehen, wobei die Verbindungskanäle als Klärspalte ausgebildet sind.This object is achieved in that the connecting channels are connected to the solids space, the connecting channels being designed as clarifying gaps.
In dem als Klärspalt ausgebildeten Verbindungskanal werden Feststoffpartikel, die in den Verbindungskanal gelangen, abgeschieden und in den Feststoffraum geleitet. Dadurch wird eine optimale Auftrennung des Produktes in drei Teilströme mit einem selektiven Klassiereffekt bewirkt.In the connecting channel designed as a clarifying gap Solid particles that enter the connection channel are separated and passed into the solid space. This results in an optimal separation of the product into three partial flows with a selective classification effect.
Bei einer weiteren vorteilhaften Ausgestaltung wird der Klärspalt gebildet zwischen einer konischen Innenwand der Schleudertrommel und einer konzentrisch dazu angeordneten, mit Abstandsleisten versehenen Außenwand eines Zwischentellers. Dadurch werden besonders großzügige Absetzflächen für den Feststoff im Klärspalt zur Verfügung gestellt, die durch im Klärspalt vorgesehene Teller noch vergrößert werden können.In a further advantageous embodiment, the clarification gap is formed between a conical inner wall of the centrifugal drum and an outer wall of an intermediate plate arranged concentrically therewith and provided with spacer strips. This provides particularly generous sedimentation areas for the solids in the clarification gap, which can be further enlarged by plates provided in the clarification gap.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachstehend näher erläutert.An embodiment of the invention is shown in the drawing and is explained in more detail below.
Mit 1 ist in der Fig. die Schleudertrommel bezeichnet, von deren Feststoffraum 2 Ablaßkanäle 3 ausgehen. Die Schleudertrommel 1 ist mit einem Tellereinsatz 4 ausgerüstet, dessen Steigekanäle 5 über ihre Eintrittsöffnungen 6 mit einem Einlaufraum 7 verbunden sind. An dem den Eintrittsöffnungen 6 gegenüberliegenden Ende der Steigekanäle 5 sind Austrittsöffnungen 8 vorgesehen, die über Verbindungskanäle 9 mit dem Feststoffraum 2 verbunden sind. Die Verbindungskanäle 9 werden gebildet zwischen einer Innenwand der Schleudertrommel 1 und einer konzentrisch dazu angeordneten, mit Abstandsleisten 10 versehenen Außenwand eines Zwischentellers 11 und besitzen radial einwärts gerichtete Kanalabschnitte 12, deren Auslaßöffnungen 13 in eine Schälkammer 14 münden, in der ein Schälorgan 15 vorgesehen ist. Während die Peripherie des Tellereinsatzes 4 mit dem Feststoffraum 2 in Verbindung steht, ist das Zentrum des Tellereinsatzes 4 über Kanäle 16 mit einer Schälkammer 17 verbunden, in der ein Schälorgan 18 angeordnet ist. In den Einlaufraum 7 mündet ein Zulaufrohr 19. Zwischen der Innenwand der Schleudertrommel 1 und der Außenwand des Zwischentellers 11 sind Teller 20 vorgesehen. Die Verbindungskanäle 9 sind über Kanäle 21 mit dem Einlaufraum 7 verbunden.1 in the figure is the centrifugal drum, from whose solid space 2
Die feststoffhaltige Suspension wird über das Zulaufrohr 19 in den Einlaufraum 7 eingespeist und gelangt über die Eintrittsöffnungen 6 in die Steigekanäle 5 des Tellereinsatzes 4, in dem eine Abtrennung der Feststoffpartikel erfolgt. Die geklärte Suspension strömt zum Zentrum des Tellereinsatzes 4 und wird über die Kanäle 16, die Schälkammer 17 und das Schälorgan 18 aus der Schleudertrommel 1 abgeleitet. Die abgetrennten Feststoffpartikel gelangen über die Peripherie des Tellereinsatzes 4 zunächst in den Feststoffraum 2, bevor sie über die Ablaßkanäle 3 ausgetragen werden. Der Querschnitt der Ablaßkanäle 3 muß zur Erzielung einer hohen Feststoffkonzentration so bemessen sein, daß möglichst wenig Flüssigkeit mit den Feststoffen abgelassen wird. Je höher die eingestellten Konzentrationswerte sind, desto weiter füllt sich der Feststoffraum 2 radial einwärts. Bei sehr hohen Konzentrationswerten reichen die Feststoffpartikel bis in die Steigekanäle 5 hinein.
Durch einen ständig über den Kanalabschnitt 12 abgezogenen Teilstrom der in die Steigekanäle 5 eingespeisten Suspension werden diese Feststoffpartikel aus dem Tellereinsatz 4 herausgeführt. Ein Teil der Feststoffe wird in den als Klärspalte ausgebildeten, mit Tellern 20 versehenen Verbindungskanälen 9 abgeschieden und in den Feststoffraum 2 zurückgeführt.
Die restlichen Feststoffe werden mit dem Teilstrom über das Schälorgan 15 aus der Trommel 1 abgezogen. Dadurch wird ein Klassiereffekt erreicht, durch den Feststoffarten, die im Feststoffkonzentrat nicht erwünscht sind, separat abgeführt werden können. Dies ist z. B. der Fall, bei der Konzentrierung von faserhaltigen Stärkesuspensionen, bei denen die Fasern im Stärkekonzentrat nicht erwünscht sind.
Mit der Schleudertrommel 1 können somit sehr hohe Feststoffkonzentrationen erzielt werden, ohne die geklärte Suspension zu beeinträchtigen bei gleichzeitiger getrennter Abführung einer zweiten Feststoffart, die im Konzentrat nicht erwünscht ist.
Bei der Verarbeitung von Produkten, die zur Schaumbildung neigen, kann dadurch verursachter Überlauf aus dem Einlaufraum 7 über die Kanäle 21 und die Verbindungskanäle 9 in die Schälkammer 14 entweichen. Eine Beeinträchtigung der über das Schälorgan 18 abgeleiteten geklärten Phase wird dadurch vermieden.The solid-containing suspension is fed into the
These solid particles are led out of the
The remaining solids are withdrawn from the
With the
When processing products that cause foaming tendency, overflow caused thereby can escape from the
Claims (4)
- Centrifugal bowl (1) for the concentration of suspended solids with a peripheral solids holding space (2) featuring discharge channels (3) and with a disk stack (4) with rising channels (5) whose inlet ports (6) are connected to an inlet chamber (7) of the centrifugal bowl (1) into which inlet chamber (7) the suspension to be clarified is fed, whereby channels (16) are provided in the centre of the disk stack (4) for discharging the clarified suspension, and the disk stack (4) is connected to the solids holding space (2) at its periphery, by which means the solids separated in the disk stack are conveyed into the solids holding space (2), and whereby the rising channels (5) are provided with outlets (8) which, via connecting channels (9) and radially inwardly directed channel sections (12), are connected to outlets (13) for separate discharge of a solids-containing partial stream, characterized in that the connecting channels (9) are connected to the solids holding space (2), whereby the connecting channels (9) are designed as clarifying gaps.
- Centrifugal bowl according to claim 1, characterized in that the connecting channels (9) are formed between an inner wall of the centrifugal bowl (1) and a concentrically arranged outer wall of an intermediate disk (11) provided with spacers (10).
- Centrifugal bowl according to claim 2, characterized in that disks (20) are provided between the inner wall of the centrifugal bowl (1) and the intermediate disk (11).
- Centrifugal bowl according to one of the claims 1 to 3, characterized in that the connecting channels (9) are connected to the inlet chamber (7) via channels (21).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4322415 | 1993-07-06 | ||
| DE4322415A DE4322415C2 (en) | 1993-07-06 | 1993-07-06 | Centrifugal drum to concentrate suspended solids |
| PCT/EP1994/001718 WO1995001841A1 (en) | 1993-07-06 | 1994-05-26 | Centrifugal drum for concentrating solids in suspension |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0688247A1 EP0688247A1 (en) | 1995-12-27 |
| EP0688247B1 true EP0688247B1 (en) | 1997-03-19 |
Family
ID=6492045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94919580A Expired - Lifetime EP0688247B1 (en) | 1993-07-06 | 1994-05-26 | Centrifugal drum for concentrating solids in suspension |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0688247B1 (en) |
| AT (1) | ATE150338T1 (en) |
| DE (2) | DE4322415C2 (en) |
| DK (1) | DK0688247T3 (en) |
| WO (1) | WO1995001841A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19504688B4 (en) * | 1995-02-13 | 2007-09-06 | Bühler AG | Combined wet grinding and wet classification |
| DE102008051499A1 (en) * | 2008-10-13 | 2010-04-15 | Gea Westfalia Separator Gmbh | Process for reducing the pulp content of pulpy fruit juices |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2478992A (en) * | 1946-08-10 | 1949-08-16 | Laval Separator Co De | Centrifugal bowl |
| DE1291291B (en) * | 1966-04-05 | 1969-03-20 | Westfalia Separator Ag | Centrifugal drum for clarifying and simultaneously separating liquid mixtures |
| NL128342C (en) * | 1966-11-22 | |||
| DE3320152A1 (en) * | 1983-06-03 | 1984-12-06 | Westfalia Separator Ag, 4740 Oelde | Continuously working centrifuge drum for concentrating suspended solids |
| DE3620134C1 (en) * | 1986-06-14 | 1987-10-01 | Westfalia Separator Ag | Centrifuge for clarifying fluids |
| DE3802305C1 (en) * | 1988-01-27 | 1989-10-05 | Westfalia Separator Ag, 4740 Oelde, De | Process and apparatus for the centrifugal removal of bacteria from milk |
| FR2635023A1 (en) * | 1988-08-05 | 1990-02-09 | Saget Pierre | Centrifuge separating apparatus for the treatment of a liquid mixture |
-
1993
- 1993-07-06 DE DE4322415A patent/DE4322415C2/en not_active Expired - Lifetime
-
1994
- 1994-05-26 DE DE59402154T patent/DE59402154D1/en not_active Expired - Lifetime
- 1994-05-26 WO PCT/EP1994/001718 patent/WO1995001841A1/en active IP Right Grant
- 1994-05-26 DK DK94919580.4T patent/DK0688247T3/en active
- 1994-05-26 AT AT94919580T patent/ATE150338T1/en active
- 1994-05-26 EP EP94919580A patent/EP0688247B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| WO1995001841A1 (en) | 1995-01-19 |
| DE4322415C2 (en) | 1996-11-28 |
| DK0688247T3 (en) | 1997-09-15 |
| EP0688247A1 (en) | 1995-12-27 |
| DE59402154D1 (en) | 1997-04-24 |
| ATE150338T1 (en) | 1997-04-15 |
| DE4322415A1 (en) | 1995-01-12 |
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