EP0160637A2 - Solid bowl centrifuge - Google Patents

Abstract

The solid bowl centrifuge is designed as a multi-chamber centrifuge (1). The housing with the centrifuge is mounted in a stationary manner, a carrier (6) for cylindrical outer surfaces (7 u being provided within the housing (2). The cylindrical outer surfaces (7 and 8) border annular chambers (9 and 10) and are in the axial direction of the shaft A screw conveyor (120) is provided for the entry of material to be dewatered. The material to be dewatered enters the first annular chamber (9) via radial channels (15). By displacing the cylindrical lateral surface (7) in the axial direction The material is ejected in the radial direction in the concentric larger annular chamber (10), and if the lateral surface (8) is subsequently displaced in the axial direction, discharge is again carried out in the radial direction.

Description

The invention relates to a solid bowl centrifuge with a rotatable, water-impermeable, axially displaceable jacket surface, a feed device for the material to be dewatered and at least one discharge for liquid and dewatered material.

Solid bowl centrifuges of this type are often also referred to as decanters if they are designed with a screw discharge for continuous operation. Solid bowl centrifuges are known in the form of cup or bottle centrifuges or tube centrifuges, with the centrifugal force becoming significantly greater than gravity at a corresponding number of revolutions, so that the liquid is applied as an axially parallel ring to the rotor wall. In the case of such designs, an overflow for a heavy component and an overflow for a light component are provided in the axial direction, provided that both are liquids. Solids must generally be removed by peeling or by hand.

From DE-PS 438 904 a centrifugal machine is already known, in which the emptying is carried out by axially displacing the drum shell. The dried material is applied axially.

The invention aims to develop a solid bowl centrifuge of the type mentioned in such a way that, in addition to separating solid and liquid material, it also enables targeted treatment of the material to be separated, for example by wet chemical decomposition or hydrolysis. Such training is particularly important in connection with the processing of sewage sludge and sludge that contain decomposable organic material, but also for drying wet coals, peat etc. through steam treatment with simultaneous removal of the steam condensate and the expelled water. Furthermore, the invention aims to simplify the discharge of the separated components and to enable a semi-continuous or continuous operation in a simple manner.

To achieve this object, the invention essentially consists in a solid jacket centrifuge of the type mentioned in the fact that at least two full-walled jacket surfaces are arranged in succession in the radial direction and can be driven separately in both axial directions of the centrifuge and that the discharge opening for the dewatered material is in the radial direction the lateral surfaces are connected and can be opened by axial displacement of at least one lateral surface. Because the lateral surfaces can be driven in both axial directions of the centrifuge, the discharge of the heavier or solid component can be considerably simplified by moving at least one lateral surface.

In the presence of a plurality of full-walled outer surfaces which can be driven separately in the direction of their axis, the arrangement is expediently such that at least one discharge opening for liquid is connected between adjacent outer surfaces in the radial direction. Due to the separate displacement of individual lateral surfaces in the axial direction of the centrifuge, the material that has been treated or centrifuged in one section can, after the liquid phase has been separated off, be transferred to a further section located on a larger radius, where, at the same speed of the centrifuge, due to the larger radius of one higher peripheral speed and a higher centrifugal force. Annular chambers are formed between the individual lateral surfaces, which result in closed treatment rooms, in which by spraying chemicals or by introducing steam, the desired reaction or hydrolysis can be carried out, such hydrolysis taking place simultaneously with centrifugation. By ejecting the solid from a section with a smaller radius into a subsequent section with a larger radius, a mechanical vortex is ensured at the same time, which favors the desired reactions and improves the dewatering behavior. A discharge opening for the liquid is connected between two adjacent lateral surfaces in order to keep the liquid ballast outward in the radial direction as little as possible. The treatment rooms formed in this way can be exposed to different pressures, the pressure equalization between these treatment rooms via their hydrolyzate discharge channels is prevented or made more difficult by seals or labyrinths between these discharge channels.

The loading of such a solid bowl centrifuge can be carried out in a simple manner in such a way that a central feed device, preferably equipped with a screw conveyor, is provided for the task of the material to be dewatered, said feed device being delimited by essentially radial channels or openings in a rotatable shell surface and end faces Annulus opens, with at least one end face is fixed immovably in the axial direction. By means of such a central feed device, the material to be dewatered, treated or hydrolyzed can be introduced centrally and, in the case of a plurality of lateral surfaces successively in the radial direction, introduced into the innermost chamber delimited by such an external surface. After a first separation and, if appropriate, a pretreatment in this first chamber, the material which has already been pretreated or predried can be pulled back into the next chamber, which is on a larger radius, are deployed.

In order to enable the treatment or the hydrolysis in individual such annular chambers, a steam feed line is preferably connected to at least one annular space delimited by lateral surfaces.

In a preferred development of the full-bowl centrifuge according to the invention, the end face of the annular spaces which has the discharge opening for liquid is designed as a sieve face, in particular as an annular face with openings which flare conically outwards and is fixed immovably in the axial direction. As a rule, this end face can be designed as an end face which is fixed immovably in the axial direction, the displaceably mounted jacket in its closed position being pressed against the end face, for example a ring shoulder or a centering cone of this ring face. Advantageously, however, the end surface opposite this end surface, which has the discharge openings for liquid, is designed as an end surface that cannot be displaced in the axial direction, this second end surface forming the wiping edge for the material adhering to the outer surface when the outer surfaces are displaced, and the discharge in the next chamber or the discharge opening ensures.

In order to guide the lateral surfaces and in particular to maintain the concentric position and thus to avoid imbalances, the lateral surface is advantageously guided and supported on at least one radial web, in particular the end wall opposite the discharge opening for liquid, on a lateral surface lying on a smaller radius.

The displacement drive for the lateral surfaces is realized in a particularly simple manner in that the lateral surfaces carry ring disks guided in control cylinders which can be acted upon with pressure medium, preferably steam, on both sides. The annular disks form the pistons sliding in the corresponding annular chamber-shaped control cylinder chambers and the axial displacement of the lateral surfaces can be achieved by applying a pressure medium to the annular disks. For this purpose, the control cylinder spaces can preferably be connected via radial channels to an axial pressure medium, in particular steam supply line. The steam, which can also be used for the hydrolysis, can be used in a particularly simple manner to drive the jacket surfaces in the axial direction of the solid jacket centrifuge. In order to ensure a more precise and unbalanced sliding support over the entire displacement path of the lateral surfaces and in order to achieve a safe displacement of the lateral surfaces even with low steam pressures by appropriate application of annular surfaces, the design is preferably such that at least one lateral surface two at an axial distance from one another arranged ring disks, which distance exceeds the axial displacement path of the lateral surfaces, and that at least one ring disk is penetrated by an axially parallel tube for the passage of pressure medium and is slidably guided thereon. The fact that in addition an axially parallel tube is provided for the passage of pressure medium, there is the possibility of also acting on the second annular disc in one of the directions of displacement, and the axially parallel tube at the same time enables a rotational position securing relative to a drive shaft. The axially parallel tube must pass through at least one non-rotatably arranged and axially non-displaceable annular disc in order to ensure protection against rotation relative to the drive shaft.

To control the displacement movement of the jacket surfaces by means of steam, a tubular slide valve is advantageously arranged in the axial steam supply line so that it can be moved and driven in the axial direction, the jacket of which has openings which, when the tubular slide valve is displaced, are aligned or aligned with the radial channel or channels this covering layer (s) can be brought. The tubular control slide can be connected to a correspondingly regulated drive and, depending on the sliding position of the slide, the associated lateral surface of the solid bowl centrifuge is displaced or pushed back into its position in contact with the end face bearing the discharge openings. Depending on which of the radial channels align openings in the jacket of the control spool, the inner or the next outer jacket is displaced in the axial direction and it is also possible with such a design, by moving the control spool back to a position in which all radial Channels to the corresponding control cylinder rooms are open, withdraw all lateral surfaces and in this way enable complete cleaning of the centrifuge.

In a structurally particularly simple manner, the axial feed device for the material to be dewatered and the axial pressure medium supply line are arranged in axial bores of a shaft, with which a carrier for the rotatable and axially displaceably drivable lateral surfaces is connected in a rotationally fixed manner, which results in a particularly stable construction. With such a construction, it is only necessary to drive the shaft for driving the centrifuge, and this is readily possible with conventional drives, for example via V-belts. The hollow shaft is particularly suitable for traaen effective supports in the radial direction and on Way to ensure the concentric arrangement of the axially displaceable lateral surfaces.

When the outer surfaces are retracted and the discharge is released into a ring chamber of larger diameter or in the direction of the discharge opening, the front edges of the outer surfaces, which in the closed state are in contact with the end surface having the discharge openings for liquid, are particularly mechanically stressed and are also exposed to increased corrosion attack when aggressive hydrolysates are formed. In order to ensure sealing in these cases over a longer operating period, the design here is preferably such that the end face of the lateral surfaces facing the discharge openings for the liquid and, if appropriate, the end face having these discharge openings in the region of their contact with the end face of the Jacket is (are) formed with armor. A further protection against undesired corrosion can be achieved in that at least the outer surfaces of annular spaces which are subjected to steam pressure are lined with ceramic material.

For better distribution of the material supplied by the feed device, radially projecting drivers, in particular axially oriented metal sheets, are preferably fixed on the shaft into the first annular space. In order to expose the material introduced via the shaft to the hydrolyzing effect of vapors for a while under a relatively low centrifugal force effect, vane-like drivers and conical surfaces, in particular those with a small opening angle, can also advantageously be used here.

To keep the feed speed independent of the speed of the shaft, the training is in the case of a Screw conveyor in a particularly simple manner so that a stationary tube is mounted in the axial bore of the shaft for receiving the feed device, in which the screw conveyor can be driven at an adjustable speed. The shaft itself can be connected to a rotary drive with a preferably adjustable speed.

In order to complete the discharge and to prevent that adhering particles accumulate in the interior of the housing, for example on the side opposite the discharge opening, the outer surface of the outer surface, which is arranged with the largest diameter, advantageously carries a peeling knife which, when this outer surface is displaced into Axis direction interacts with the inner wall of the housing.

The invention is explained in more detail below with reference to an embodiment shown in the drawing. 1 shows a longitudinal section through the full-jacket centrifuge according to the invention, FIG. 2 shows the central area of the design according to FIG. 1 in an enlarged view, FIG. 3 shows the area of the tubular control slide for driving the jacket surfaces corresponding to the view according to FIG. 1 in 4 shows the area of the supply of the material to be dewatered and treated in accordance with FIG. 1 in an enlarged view and FIGS. 5 to 8 schematically show different positions of the control slide for controlling the displacement movement of the lateral surfaces.

In Fig. 1, a multi-chamber centrifuge is shown, which is designated 1. The housing of this multi-chamber centrifuge, which is designed as a solid-bowl centrifuge, is designated by 2 and is mounted in a stationary manner. A drive shaft 3 is rotatably mounted in bearings 4 in this housing. For the drive, a V-belt pulley 5 is rotatably connected to the shaft 3. Within the housing is a carrier 6 for cylindrical lateral surfaces 7 and 8 arranged and rotatably connected to the shaft 3. The two cylindrical lateral surfaces 7 and 8 delimit annular chambers 9 and 10 and are displaceable in the axial direction of the shaft 3, as is shown in the lower part of FIG. 1.

The material to be dewatered is introduced via a feed hopper 11 and a screw conveyor 12, which is accommodated in an axial bore 13 in the shaft 3. In this hole, a casing tube 14 of the screw conveyor is inserted, which is mounted in a stationary manner and allows the shaft 3 to be rotated relative to this casing tube 14. Material to be dewatered or treated is introduced into the first annular chamber 9 via essentially radial channels 15, which is delimited in the radial direction by the inner of the two cylindrical lateral surfaces 7. End faces 16 and 17 are provided in the axial direction, which are immovable in the axial direction relative to the shaft 3 and represent further boundary walls of the annular chamber 9. The end face 17 is designed as an annular disk and has openings for the discharge of liquid.

In a further axial bore of the shaft 3, a tubular control slide 18 is arranged, which is displaceable in the axial direction of the shaft 3 by a drive 19. A steam supply line is connected to the interior of the tubular control slide 18 via a connection 20, the steam supplied being used as pressure medium for the displacement movement of the cylindrical lateral surfaces 7 and 8.

In the radial direction adjoins the two annular chambers 9 and 10, the discharge opening 21, through which the dewatered and treated material is discharged.

The drive of the screw conveyor 12 is shown schematically at 22.

The details of the solid bowl centrifuge shown in FIG. 1 can be seen more clearly from FIGS. 2, 3 and 4. 2 shows the housing 2 of the centrifuge in an enlarged view, the cylindrical lateral surfaces which delimit the chambers 9 and 10, annular disks 23 and 24 which are guided as control pistons in a common cylinder space 25. These annular disks 23 and 24 define annular control cylinder spaces into which pressure medium for the displacement of the cylindrical lateral surfaces 7 and 8 can be introduced. For this purpose, radial bores 27 and 28 are provided, starting from an axial bore 26 in which the control slide 18 is guided. The radial bore 27 opens here via an axially parallel tube 29 into a control cylinder chamber 30 for the outer of the cylindrical jacket surfaces 8. Pressurizing the annular chamber 30 with pressure medium, in particular superheated steam, causes a displacement of the cylindrical jacket surface 8 in the direction of arrow 31 in the in the lower half of FIG. 2 end position. Likewise, by pressurizing the radial bore 28 with pressure medium, the pressure medium or the steam can be pressed into annular control cylinder spaces 31 and via an axially parallel tube 32 into a further annular control cylinder space 33, so that the inner of the two cylindrical lateral surfaces 7 into the lower half 2 end position shown can be moved. With simultaneous displacement of these two cylindrical lateral surfaces 7 and 8, as shown in the lower part of FIG. 2, the interior of the centrifuge is easily accessible for cleaning purposes. The end face 34 of the two annular chambers 9 and 10 has separate discharge openings for liquid formed by perforated annular disks 35 for each annular chamber 9 or 10. The liquid emerging from the annular chambers 9 and 10 is in substantially axial channels 36 and 37 are discharged, this end wall 34 rotating at the rotational speed of the shaft 3. A labyrinth seal 38 is provided between the channels 36 and 37, the parts of which are screwed on the one hand in a stationary manner to the cover plate 39 of the housing 2 and on the other hand to the end face 34. The drain lines 40 and 41 for the liquid discharged from the annular chambers 9 and 10 and a flushing line 42 for cleaning bearing surfaces of the shaft relative to the stationary housing 2 are connected to the stationary cover plate 39.

The cylinder space 25 is connected via a bore 43 of the carrier 6 to the housing interior 44, to which a steam supply line is connected via a connection 45. The supply of steam via the connection 45 enables the movement of the cylindrical lateral surfaces 7 and 8 against the direction of the arrow 31 in their in FIG. 2 above in the case of an unpressurized axial supply bore 26 and thus in the absence of a control pressure in the annular control cylinder spaces 30, 31 and 33 Operating position shown, in which the end faces 46 and 47 of these lateral surfaces 7 and 8 are pressed sealingly against the end face 34. In the area of the contact points, both the end face 34 and the end faces 46 and 47 of the cylindrical jacket surfaces 7 and 8 have armouring in order to better withstand the mechanical stresses.

The annular chambers 9 and 10 are further delimited by annular disks 48 and 49 which are fixed immovably in the axial direction and whose edges which are in contact with the inside of the cylindrical lateral surfaces 7 and 8 are designed as wiping edges. Concentric guidance of the cylindrical lateral surfaces 7 and 8 during their displacement in the axial direction is facilitated via these annular disks 48 and 49, and for this purpose the carrier 6 in FIG Axial direction non-displaceably connected support webs 50 and 51 are provided.

For the displacement of the cylindrical lateral surfaces 7 and 8 in the direction of arrow 31, the annular spaces 52 and 53 must of course be relieved, for which purpose relief bores (not shown in FIG. 2) are provided. Between the two parts of the cylindrical lateral surfaces 7 and 8 carrying the annular disks 23 and 24, an annular gap 54 is provided, via which steam can be injected from the cylinder chamber 25 into the outer annular chamber 10 via a bore 55 of the end disk 49.

The tubes 29 and 32 are each fixed to the annular disks 48, 51 and 50, which are immovable in the axial direction, and to the end plate of the carrier 6 and have outlets into the corresponding control rooms. This fixing of the tubes 29 and 32 creates a further guide for the sliding movement of the lateral surfaces 7 and 8, which at the same time provides protection against relative rotation of these lateral surfaces 7 and 8 relative to the carrier 6 or the drive shaft 3.

The carrier 6 is non-rotatably connected to the shaft 3 via wedges 56.

In Fig. 3, the tubular control slide 18 is shown enlarged in an analogous representation as in Fig. 1 and 2. The tubular control spool 18 is driven by a drive arrangement 19 designed as a spindle drive. The control spool 18 has openings 57 in its casing which can be aligned with the radial bore 27 by moving the tubular control spool 18 in the sense of the double arrow 58. The tubular control slide 18 can be supplied with steam via the connection 20 and it can, depending on the position of the tubular slide 18, the independent or common drive of both cylindrical jacket surfaces 7 and 8 take place.

The receiving bore 26 extends in the axial direction of the shaft 3, as can be seen from FIG. 2, up to close to the end of the screw conveyor. Via an essentially radial bore 58, steam can also be pressed into the inner annular chamber 9 via this axial bore, so that hydrolysis can also be carried out in this annular chamber.

In Fig. 4 the screw conveyor already explained in Fig. 1 is shown enlarged. The casing tube 14 passes through a bushing 59 and can thus be held in a rotationally fixed manner relative to the shaft 3. The part of the labyrinth seal 38 connected to the stationary end plate 39 of the housing 2 is designated 60 in FIG. 4, whereas the part of this labyrinth seal 38 which rotates with the end face 34 is designated 61.

The rotary drive 22 for the screw conveyor 12 is coupled via a gear with a shaft 62 arranged in the feed hopper 11, which carries distributor vanes 63 for the uniform distribution of the material over the width of the screw conveyor 12.

5 to 8 show the respective position of the control slide 18 in different operating states. 5, both channels 27 and 28 are open and when the pressure medium supply or steam supply is switched off via the connection 45 and these bores 27 and 28 are acted upon by control pressure medium or steam, both annular chambers 9 and 10 are open. This position enables the centrifuge to be cleaned. 6, only the radial bore 28 is now open. This position corresponds a displacement of the cylindrical lateral surface 7 in the direction of arrow 31 in accordance with FIG. 2 and the inner annular chamber 9 is thus opened. In such a position, the material contained in the annular chamber 10 can be hydrolyzed by injecting steam via the radial bore 58, no steam being pressed in via the connection 45. 7, both radial bores 27 and 28 are closed by the tubular control slide 18, so that when the cylinder space 25 is acted upon via the connection 45, both cylindrical lateral surfaces 7 and 8 come into their closed position. In such a position, in which no pressure medium or vapor pressure is built up in the bore 26, dewatering can take place in the inner annular chamber 9 and hydrolyzed in the outer annular chamber 10, the steam required for the hydrolysis being provided via the annular gap 54 and the opening 55 is introduced into the outer annular chamber 10 in the end disk 49.

In the displacement position of the tubular control slide 18 finally shown in FIG. 8, the radial opening 57 of the control slide 18 reaches a position aligned with the radial bore 27, whereas the radial bore 28 is closed. With such a displacement position, the cylindrical jacket surface 7 remains closed in its closed position and the inner annular chamber 9. However, the outer annular chamber 10 is opened because the cylindrical outer surface 8 moves into its displacement position in accordance with the direction of the arrow 31. In this position, the contents of the outer annular chamber 10 are emptied and are discharged for the treated and dewatered material. In this displacement position, the vaporization remains open via the connection 45.

As can finally be seen from the illustration according to FIG. 2, the outer of the two cylindrical jacket surfaces 8 carries on its outside a peeling knife 64 which interacts with the inner wall 65 of the stationary housing 2 when the outer cylindrical jacket surface 8 is displaced and in this way the ensures complete discharge in the direction of the discharge opening 21.

Claims (20)

1. Solid bowl centrifuge (1) with a rotatable, impermeable, axially displaceable jacket surface (7, 8), a feed device (11 - 15) for the material to be dewatered and at least one discharge for liquid and dewatered material, characterized in that in radial direction successively at least two full-walled jacket surfaces (7, 8) are arranged and can be driven separately in both axial directions of the centrifuge and that the discharge opening (21) for the dewatered material is connected in the radial direction to the jacket surfaces (7, 8) and by axial Displacement of at least one lateral surface can be opened. 2. Solid bowl centrifuge according to claim 1, characterized in that between adjacent radial surfaces in the radial direction (7, 8) at least one discharge opening (36, 37) for liquid is connected. 3. Solid bowl centrifuge according to claim 1 or 2, characterized in that a central, preferably equipped with a screw conveyor (12), feed device is provided for the task of the material to be dewatered, which via essentially radial channels (15) or openings in one of a rotatable outer surface (7) and end faces (16, 17) bounded annular space (9) opens, at least one end face being fixed immovably in the axial direction. 4. Solid bowl centrifuge according to claim 1, 2 or 3, characterized in that a steam supply line is connected to at least one of the jacket surfaces (7, 8) bounded annular space (9, 10). 5. Solid bowl centrifuge according to one of claims 1 to 4, characterized in that the discharge opening (36, 37) for liquid end face (34) of the annular spaces (9, 10) as a sieve surface (35), in particular as an annular surface with a conical shape outside widening openings, is formed and is fixed immovably in the axial direction. 6. Solid bowl centrifuge according to one of claims 1 to 5, characterized in that the outer surface (s) (7, 8) via at least one radial web (50, 51), in particular that of the discharge opening (36, 37) for liquid opposite end wall, is (are) slidably guided and supported on a lateral surface lying on a smaller radius. 7. Solid bowl centrifuge according to one of claims 1 to 6, characterized in that the outer surfaces (7, 8) in control cylinders (30, 31, 33) carry guided annular discs (23, 24) which can be acted upon on both sides with pressure medium, preferably with steam are. 8. Solid bowl centrifuge according to claim 7, characterized in that the control cylinder spaces (30, 31, 33) via radial channels (27, 28) with an axial pressure medium, in particular steam supply line (26) can be connected. 9. Solid bowl centrifuge according to claim 8, characterized in that at least one outer surface (8) carries two axially spaced annular disks (23, 24), which distance exceeds the axial displacement path of the outer surfaces (7, 8), and that at least one Ring disk (24) is penetrated by an axially parallel tube (29) for the passage of pressure medium and is guided in a sliding manner thereon. 10. Solid bowl centrifuge according to claim 8 or 9, characterized in that within the axial steam supply line (26) a tubular slide (18) is arranged displaceably and drivable in the axial direction, the jacket of which has openings (57) which upon displacement of the tubular slide (18 ) can be brought into a position in alignment with or covering the radial channel (s) (27, 28). 11. Solid bowl centrifuge according to one of claims 1 to 10, characterized in that the axial feed device (12 - 15) for the material to be dewatered and the axial pressure medium supply line (26) are arranged in axial bores of a shaft (3) with which a carrier (6) for the rotatable and axially displaceably drivable lateral surfaces (7, 8) is rotatably connected. 12. Solid bowl centrifuge according to claim 9 and 11, characterized in that between the two annular disks (23, 24) in the axial direction immovable radial support (50, 51), in particular an annular surface, with the carrier (6) or the shaft (3) connected is. 13. Solid bowl centrifuge according to one of claims 1 to 12, characterized in that the the discharge openings (36, 37) for the liquid end face (34) facing the end face (46, 47) of the jacket surfaces (7, 8) and optionally this End face (34) having discharge openings is (are) formed with armor in the area of their contact with the end face (46, 47) of the casing (7, 8). 14. Solid bowl centrifuge according to one of claims 1 to 13, characterized in that at least the outer surfaces (7, 8) of annular spaces (9, 10) which are subjected to steam pressure are lined with ceramic material. 15. Solid bowl centrifuge according to one of claims 1 to 14, characterized in that on the shaft (3) in the innermost annular space (9) or between the axial boundary walls of further annular spaces guide and distribution devices in the form of in the respective annular space (9, 10) immersing radially projecting drivers of conical surfaces, preferably those with a small opening angle, and / or displacement bodies are arranged. 16. Solid bowl centrifuge according to claim 15, characterized in that in one of the annular spaces (9, 10), preferably the innermost (9), an elastic displacement body is arranged which can change its volume by pressurizing medium and thus exert pressure on the filling of the annular space . 17. Solid bowl centrifuge according to one of claims 1 to 16, characterized in that in the axial bore (13) of the shaft (3) for receiving the feed device, a stationary tube (14) is mounted in which the screw conveyor (12) with adjustable Speed is drivable. 18. Solid bowl centrifuge according to one of claims 1 to 17, characterized in that the shaft (3) is connected to a rotary drive (22) with preferably adjustable speed. 19. Solid bowl centrifuge according to one of claims 1 to 18, characterized in that the arranged on the largest diameter jacket surface (8) carries on its outside a peeling knife (64) which, when this jacket surface (8) is displaced in the axial direction with the inner wall (65) of the housing (2) interacts. 20. Solid bowl centrifuge according to claim 6, characterized in that between the displaceable jacket surfaces (7, 8) and the radial, these supporting webs (50, 51) in the radial direction are limited elastic, adjustable in their elasticity rings with high internal damping.

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