EP1509329A1 - Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof - Google Patents

Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof

Info

Publication number
EP1509329A1
EP1509329A1 EP20030730121 EP03730121A EP1509329A1 EP 1509329 A1 EP1509329 A1 EP 1509329A1 EP 20030730121 EP20030730121 EP 20030730121 EP 03730121 A EP03730121 A EP 03730121A EP 1509329 A1 EP1509329 A1 EP 1509329A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
chamber
characterized
solid
barrier
liquid
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
EP20030730121
Other languages
German (de)
French (fr)
Other versions
EP1509329B1 (en )
Inventor
Wolf-Dietrich Herberg
Franz Kramer
Wilhelm Ostkamp
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.)
GEA Westfalia Separator GmbH
Original Assignee
GEA Westfalia Separator GmbH
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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B11/00Feeding, charging, or discharging bowls
    • B04B11/08Skimmers or scrapers for discharging ; Regulating thereof
    • B04B11/082Skimmers for discharging liquid
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B1/00Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B04CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04BCENTRIFUGES
    • B04B1/00Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083Configuration of liquid outlets

Abstract

The invention relates to a solid bowl screw centrifuge comprising a rotating drum (3) having a horizontal rotation axis, which surrounds a centrifuging chamber (11), a rotating screw (5) rotatably mounted inside the drum (3), and at least one liquid discharge and at least one solids discharge. The liquid discharge is effected by a peeling disc (19) downstream from which a blocking chamber (29) is connected. The inventive centrifuge is characterized in that the blocking chamber (29) is a hydrohermetic blocking chamber (29) which serves to seal the centrifuging chamber (11) from the surroundings by using a sealing liquid, to which a feed line (35) is directly assigned for feeding the separate sealing liquid that is independent from the centrifuge material, and in that the screw centrifuge (1) has a second siphon disc (21) that, starting from the screw (5), radially extends outward into the centrifuging chamber (11).

Description

Solid bowl screw centrifuge with a peeling disc and method of operating the

The invention relates to a solid-bowl screw centrifuge according to the preamble of claim 1 and a process for their operation.

The apparatus disclosed in DE 43 20 265 AI solid-bowl screw centrifuge is at the

provided liquid outlet side with a weir, which has a passage. The passage is assigned during rotation of the drum relative to the stationary throttle plate which is axially displaceable via a threaded bush. By turning the threaded bushing, the distance between the weir and the orifice plate can be varied. The accompanying

Variation of the outflow cross-section causes a change of the liquid level in the centrifugal drum, so that a continuous adjustment of this liquid level by displacing the throttle disk is possible.

DE 39 04 151 AI a baffle plate on the worm is known. Nozzles at the outer periphery are used to minimize power consumption. A processing sensitive product under gas-tight sealing to the environment is not possible with this construction.

From the generic DE 198 30 653 Cl, it is known to support an open Flüssigkeitsaus- solid-bowl screw centrifuge via a centripetal pump to realize, which is connected downstream of a labyrinth seal to lead the product droplets to the stripping disk back. After this construction does not seal against the exterior space is required. However, there is also a need for solid bowl worm centrifuge with peeling disc, is in which the product space sealed from the outside. The realization of such a solid bowl worm centrifuge with simple structural means is the object of the invention. The invention achieves this object by the subject matter of claim 1. Then, the chamber has an annular chamber having disposed therein the first barrier and siphon disk, which chamber is a hydro-hermetic barrier chamber for sealing the centrifugal chamber from the environment by means of a barrier liquid which is directly a feed line for the separate and independent from the sealing liquid to be centrifuged is assigned,

The invention also provides a simple method for operating the centrifuge erfmdungs- proper to be created. This is stated in the appealed 15th

a separate, independent of the centrifuged barrier liquid through a supply line directed - Thereafter, in the hydro-hermetic barrier chamber - for sealing the centrifugal chamber from the environment.

Preferably, the screw in a second siphon disk which extends from the

Screw radially outwardly in the centrifugal chamber.

The lock chamber with barrier fluid supply - is particularly preferred in combination with the two blocking or Siphonscheiben - allows a constructively simple and economical manner a reliable seal of the centrifugal chamber from the surrounding atmosphere. In the generic DE 198 30 653 Cl, however, the product can still come into contact with the surrounding atmosphere through the labyrinth seal.

Lock chambers are also known per se also in the centrifuge with the vertical axis of rotation, being guided in this, a separate barrier fluid (DE 196 31 226). Lock chambers in such separators are also known from DE 657 473. It was not previously planned and probably not considered advantageous also in centrifuges with horizontal axis of rotation a lock chamber to re- ALISE which is subjected to a separate, independent of the barrier fluid to be centrifuged.

When setting up a pressure inside the decanter or solid bowl screw centrifuge in a centrifuged (for example, a beverage) was dissolved gas

(such as C0 2) escape without the barrier chamber arrangement with two Siphonscheiben and the barrier fluid supply may in part from the solid bowl screw centrifuge. This prevents the invention.

With the barrier or siphon in the lock chamber, a sufficient pressure can be built up in a simple manner so that a gas such as C02 is maintained in the liquid speed (sphase). By varying the diameter of the barrier and siphon disk the pressure in the barrier chamber is variable, which is preferably up to 4 bar, especially 0.5 to 2.5 bar is. The pressure affects the way the promotion of the solid and / or its consistency.

Particularly preferably, the inlet line and a Abiaufbohrung which enable the continuous supplying and discharging the sealing liquid into and out of the barrier chamber open into an annular space of the lock chamber. This ensures a continuous cleaning of the barrier chamber realized and thus the formation of deposits in the barrier chamber effectively prevents a much simpler manner than in DE 196 31 226 AI. In order for the centrifuge and high hygiene demands.

Since the liquid discharge is performed with a peeling disc, the barrier chamber is connected directly downstream, in particular, a dissolved gas such as C0 2 may be at least substantially maintained in the liquid to be processed or to be derived what the processing of products such as beer greatly simplified. In particular, the barrier chamber are drum side as the peeling disc with respect to the main bearings of the drum or disposed toward the drum, making it possible to easily design the construction. This not only a permanent seal against the surrounding atmosphere but possibly also a seal against product contamination by oil mist of liquid-keitsseitigen main bearing results (not shown here).

Further advantageous embodiments are disclosed in the remaining dependent claims.

The invention on the basis of exemplary embodiments with reference will be explained in more detail to the drawing. In the drawings: Figure 1 is a section through a solid bowl worm centrifuge;. an enlarged detail from FIG. 1 and FIG. 2.

Fig. 1 shows a solid-bowl screw centrifuge 1 having a drum 3 with a horizontal axis of rotation, in which a screw 5 is arranged. The drum 3 and the screw 5 each have a substantially cylindrical portion and a conically tapered portion on here.

An axially extending centric inlet pipe 7 is used for feeding the material to be centrifuged over a 8 here perpendicular to the inlet tube 7 manifold 9 into the centrifugal chamber 11 between the screw 5 and the drum. 3

For example, a muddy slurry fed into the centrifuge, settle solid particles on the drum wall. Next towards the inside, a liquid phase is formed. The bearing with the bearing 6 screw 5 is rotated at a somewhat smaller or greater speed than the drum 3, and promotes the centrifuged solids S to the conical portion towards from the drum 3 to a Feststoffaus- support (not shown here).

In contrast, the liquid flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is guided there by a weir 15 in an axially adjoining the actual centrifugal chamber with a chamber 17 in comparison to the centrifugal chamber smaller diameter.

In the chamber 17 (see also Fig. 2) a paring disc 19 is arranged for deriving the liquid phase L, to which a discharge channel 20 connects, which is derived from the liquid phase L of the drum 3. The peeling plate 19 is disposed directly on the stationary inlet pipe in the operation 7, wherein between peeling disc 19 and inlet tube 7 a sealed gap-free arrangement is realized.

Preferably, in the conically tapering portion of the drum 3, the screw 1 - in front of the solids discharge (not shown) - a first siphon 21 which derraum from the screw 5 from radially outward into the air lock 11 extends and in the liquid level Pl dips.

By immersing the inner region and the spin dryer region in the centrifugal chamber 11 (to the right of the siphon 21 here) hermetically sealed against the environment and the ambient atmosphere. It would also be conceivable to arrange more Siphonscheiben in the conical portion of the drum 3, in order thus to influence the solids consistency (not shown here)

In the chamber 17 an annular shoulder 23 is disposed on the side facing the centrifugal chamber side of the peeling disc 19 extending radially from the inner periphery of the chamber 17 towards the inside. Between the first siphon 21 and the annular shoulder 23, a liquid level Pl is formed in the operation of the centrifuge, since sibh the siphon 21 and the annular shoulder are overlapped in the radial direction and since the two elements are adapted to one another accordingly.

Between the side closer to the peeling disc 19 annular shoulder 23 and the stripping disk 19 of the liquid level P2 on the other hand here extends to the Eintrittsöffhung 25 of the peeling disc. By throttling of the stripping disk 19 of Flüssigkeitspe- gel can be varied here.

On the side remote from the ring disc 23 side of the peeler disk 19, the chamber 17 extends radially inwardly up to near the inlet pipe zoom or to a diameter which is smaller than the diameter of the screw 5 and opens into an axial passage 27 , which is adjoined in the axial direction of an acting as a barrier chamber annulus 29, which in turn opens out into an axial discharge channel 31 for barrier liquid on the outer circumference of the inlet pipe 7 and the discharge channel 21 for the material to be centrifuged, wherein the inner diameter of the discharge channel 31 for barrier liquid is less than the inner diameter of the passage 27, so that 19 overflow barrier liquid flows out of the barrier chamber through the discharge channel 31st

In the lock chamber or in the annular space 29 a further siphon or blocking disc 33 is fixedly secured to the inner circumference of which extends radially from the inside outwardly into the locking chamber.

A driving end from the outside into the centrifuge inlet line 35 - here arranged parallel to the inlet tube 7 at the outer circumference - allows the direct feeding of a independent of the centrifuged barrier liquid such as water from the inside into the blocking chamber 29. A Abiaufbohrung 37 - here an acute angle on the outer circumference of the annular space 29 to the axis of rotation radially outwards from the drum 3 leader - allows continuous draining of the sealing liquid from the annular space 29, which causes an advantageous continuous cleaning.

In operation - ie rotations of the drum 3 and the screw 5 - formed in the annular space 29, a liquid level P3 of the sealing liquid from which seals the interior of the drum 3 from the surrounding atmosphere when the supply runs close to seal liquid in the seal chamber is greater is defined as the delivery volume, which is set by the dimensioning of the drain hole 37th Excess water, which does not proceed through the drain hole 37, flows out through the discharge channel 31st

With the second siphon 33 in the lock chamber 29 but can easily

Thus, a sufficient pressure can be built up, so that gas is maintained in the liquid. By varying the diameter of the barrier and siphon disk 33, the pressure in the locking chamber 29 can be varied. The pressure affects the way the promotion of the solid and / or its consistency.

Bezugszeichenϊiste

Solid bowl centrifuge 1

camp 2

drum 3

screw 5

Inlet tube 7

centrifuged 8

distributor 9

Centrifugal chamber 11

Discharge channel 13

weir 15

chamber 17

Centripetal pump 19

Discharge channel 20

Barrier and siphon 21

Annular shoulder 23

Inlet opening 25

passage 27

Annulus 29

Discharge channel 31

Barrier and siphon 33

Supply line 35

Drain hole 37

Liquid level P1, P2, P3

centrifuged S

Claims

claims
1. A solid-bowl screw centrifuge, having a) a rotatable drum (3) with a horizontal axis of rotation which a
Centrifugal chamber (11) surrounding, b) in the drum (3) arranged rotatable screw (5), c) at least one liquid and at least one solids discharge, the liquid discharge with a peeling disk (19) occurs, the egg ne chamber ( 29) is connected downstream, characterized in that d) the chamber (29) has an annular space (29) (having disposed therein barrier and siphon disk 33), e) wherein the chamber (29) has a hydro-hermetic barrier chamber (29) for sealing the centrifugal space (11) against the environment by means of a
is barrier liquid which is directly a feed line (35) for the separate, is assigned by the centrifuged independent barrier liquid.
2. A solid-bowl screw centrifuge according spoke 1, characterized in that the screw (1) has a second siphon disk (21), extending from the
Screw (5) radially outwards into the centrifugal chamber (11).
3. A solid-bowl screw centrifuge according to claim 1 or 2, characterized in that the barrier chamber (29) of the peeling disc (19) is provided immediately downstream.
4. A solid-bowl screw centrifuge according spoke 1, 2 or 3, characterized in that the second siphon disk (21) on the screw (2) in front of the solids discharge disposed.
5. A solid-bowl screw centrifuge according to claim 4, characterized in that the second siphon disk (21) on the screw (2) in the conically tapered section is arranged.
6. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that in the annular space (29) open the feed line (35) and an outlet bore (37) which in and out of the barrier chamber (the continuous supplying and discharging the sealing liquid 29 ) enable.
7. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the drum (3) and the screw (5) each having a substantially cylindrical portion and a having a tapered portion, wherein a chamber to the cylindrical portion (17) connects with a preferably smaller in comparison with the centrifugal chamber diameter, in which the peeling disk (19) is arranged.
8. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that on the inner circumference of the chamber (17) an annular shoulder (23) is arranged.
9. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the chamber (17) on the annular disc (23) opposite side of the peeling disk (19) radially inwardly to a diameter extends, which is smaller than is the diameter of the screw (5) and that the chamber (17) opens in a passage (27) connects to the in a- xialer direction of the annular space (29) opens which in an axial discharge channel (31) for barrier liquid, wherein the inner diameter of said discharge ducts (31) is smaller than that of the passage (27), so that from the lock chamber (19) overflowing barrier liquid through the discharge channel (31) is derived.
10. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that in the annular space (29) is attached to the inner circumference of the chamber perpendicular to the first barrier and siphon disk (33) or Toggle formed extending radially from the inside to the outside into the annular space (29).
11. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the feed line (35) is arranged parallel to an inlet Rohr (7) for material to be centrifuged on the outer circumference.
12. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the outlet bore (37) from the outer periphery of the annular space (29) radially is preferably carried out at an acute angle to the rotational axis to the outside of the drum (3).
13. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the first siphon disk (21) and the annular shoulder (23) are matched to one another such that a liquid level forming Pl between them during operation of the centrifuge.
14. A solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the peeling disk (19) is sealingly disposed on the stationary operating inlet pipe (7).
15. A method for operating a solid-bowl screw centrifuge according to one of the preceding claims, characterized in that in a hydro-hermetic barrier chamber (29) for sealing the centrifugal space (11) against the environment by a feed line (35) passed a separate, independent of the centrifuged Sperrflussigkeit becomes.
16. The method according spoke 14, characterized in that is carried out by the permanent discharge of barrier liquid continuous cleaning of the barrier chamber (29).
17. The method according spoke 14 or 15, characterized in that by variation of the diameter of the barrier and siphon disk (33) the pressure in the barrier chamber (29) is adjusted.
18. The method of claim 14, 15 or 16, characterized, in that the
Pressure in the centrifuging space is bar up to 4 bar, in particular 0.5 to 2.5.
EP20030730121 2002-05-29 2003-05-27 Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof Active EP1509329B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2002123802 DE10223802B4 (en) 2002-05-29 2002-05-29 Solid bowl centrifuge
DE10223802 2002-05-29
PCT/EP2003/005530 WO2003099446A1 (en) 2002-05-29 2003-05-27 Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof

Publications (2)

Publication Number Publication Date
EP1509329A1 true true EP1509329A1 (en) 2005-03-02
EP1509329B1 EP1509329B1 (en) 2005-11-09

Family

ID=29557371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030730121 Active EP1509329B1 (en) 2002-05-29 2003-05-27 Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof

Country Status (8)

Country Link
US (1) US7056273B2 (en)
EP (1) EP1509329B1 (en)
CA (1) CA2485082C (en)
DE (2) DE10223802B4 (en)
DK (1) DK1509329T3 (en)
ES (1) ES2248753T4 (en)
RU (1) RU2283188C2 (en)
WO (1) WO2003099446A1 (en)

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Also Published As

Publication number Publication date Type
WO2003099446A1 (en) 2003-12-04 application
ES2248753T3 (en) 2006-03-16 grant
US7056273B2 (en) 2006-06-06 grant
RU2283188C2 (en) 2006-09-10 grant
DE10223802A1 (en) 2003-12-18 application
DK1509329T3 (en) 2006-01-30 grant
US20050227848A1 (en) 2005-10-13 application
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