KR20230097193A - Centrifuge with a stack of disks - Google Patents

Abstract

The present invention provides a centrifugal separator configured to separate heavy and light phases from a liquid feed mixture. The separator includes a frame (2), a driving member (3) and a rotating part (4). The drive member 3 is configured to rotate the rotating part 4 relative to the frame 2 about the axis of rotation X, the rotating part 4 being composed of a centrifuge rotor 5 surrounding the separation chamber 9 includes The separation chamber 9 also comprises a stack 10 of separation discs 10a arranged coaxially about the axis of rotation X and axially below the top disc 11, the centrifuge 1 comprising: It further comprises an inlet (14) for receiving the liquid feed mixture into the centrifuge rotor (5), a first outlet (6) for the heavy phase and a second outlet (7) for the light phase. The second outlet 7 is arranged in an outlet chamber 8 integrated in the top disk 11, which outlet chamber 8 has in its lowest axial position P1 the stack 10 of the separating disks 10a. ) is arranged to be axially located below the uppermost axial position P3 of ).

Description

Centrifuge with a stack of disks

The present invention relates to the field of centrifugal separators, and more particularly to centrifugal separators for cleaning running water on ships.

Centrifugal separators are generally used for separation of liquids and/or separation of solids from liquids. During operation, the liquid mixture to be separated is introduced into the rotating bowl, and heavy particles or dense liquids, usually water, accumulate at the periphery of the rotating bowl, while less dense liquids accumulate closer to the central axis of rotation. This allows for the collection of parts separated by different outlets each disposed at the periphery and close to the axis of rotation, for example.

Centrifugal separators can be used to treat bilge water on ships. Bilge water must be treated to reduce the oil content to a level that meets international regulations for release to the environment. However, cleaning of the bilge water poses distinct challenges. The composition and flow of bilge water is constantly changing, making continuous and efficient processing difficult, but processing on board ships also presents another set of constraints. The treatment method must meet the requirements and demands of the individual vessel, for example with respect to compactness and ability to withstand harsh weather conditions.

Although centrifuges have been used on ships for decades due to their superior efficiency in cleaning liquids, there is still a need in the field for centrifuges for cleaning bilge water that are more compact and easier to operate in rough sea weather.

WO00/5330 discloses a centrifugal separator in which the liquid outlet for the liquid light phase is arranged in a distributor.

It is an object of the present invention to at least partially overcome one or more limitations of the prior art. In particular, it is an object to provide a compact centrifugal separator. It is also an object of the present invention to provide a centrifugal separator with increased operating capability during rough weather at sea.

As a first aspect of the present invention, there is provided a centrifugal separator configured to separate a heavy phase and a light phase from a liquid feed mixture, the centrifugal separator comprising:

Including a frame, a driving member and a rotating part,

the drive member is configured to rotate the rotating part relative to the frame about the axis of rotation (X);

The rotating part includes a centrifuge rotor surrounding the separation chamber;

the separation chamber comprises a stack of separation disks arranged coaxially about the axis of rotation (X) and axially below the top disk;

The centrifuge further comprises an inlet for receiving the liquid feed mixture into the centrifuge rotor, a first outlet for the heavy phase, and a second outlet for the light phase;

The second outlet is arranged in an outlet chamber integrated in the top disk, the outlet chamber being arranged such that its lowermost axial position is axially located below the uppermost axial position of the stack of separation disks.

The centrifugal separator is for separation of the liquid feed mixture. The liquid feed mixture may be an aqueous liquid or an oily liquid. As an example, the centrifugal separator may be for separating impurities such as oil and/or particles from an aqueous liquid. Thus, the liquid feed is separated into at least two phases, a light phase and a heavy phase. The heavy phase has a higher density than the light phase. The light phase and/or heavy phase may be a liquid phase. Alternatively, the heavy phase may be a solid phase. The centrifugal separator may be arranged to separate the liquid feed mixture into a liquid light phase, a liquid heavy phase and a solid phase, i.e. a sludge phase.

The frame of the centrifuge is a non-rotating part, and the rotating part may be supported by the frame by at least one bearing device, which may include a ball bearing. The rotating part of the separator may be arranged to be rotated about a vertical axis of rotation, ie the axis of rotation X may extend vertically. The rotating part includes a centrifuge rotor. The centrifuge rotor is generally supported by a spindle, i.e., a rotating shaft, and thus may be mounted to rotate with the spindle. As a result, the rotary part may comprise a spindle rotatable about the axis of rotation X. The centrifugal separator may be arranged such that the centrifuge rotor is supported by the spindle at one of its ends, such as the lower end or the upper end of the spindle.

The driving member for rotating the rotary part of the separator may include an electric motor having a rotor and a stator. The rotor may be fixedly connected to a rotating part, for example a spindle. Advantageously, the rotor of the electric motor can be provided on or fixed to the spindle of the rotating part. Alternatively, a drive member may be provided next to the spindle and rotate the rotating part by a suitable transmission such as a belt or gear transmission.

The centrifuge rotor encloses a separation chamber in which separation of the fluid mixture takes place by means of the rotor walls. The separation chamber further includes a stack of separation disks. The separation disk can be made of metal, for example. The separation disc can also be a frusto-conical separation disc, ie a frusto-conical separation disc with a separation surface forming a frusto-conical part of the separation disc. The inclination angle of the separation surface may be in the range of 30 to 50 degrees relative to the radial direction, preferably about 40 degrees.

The separation disks are arranged coaxially about the axis of rotation X at a distance from each other to form a passage between each two adjacent separation disks. The separation discs in the disc package may be arranged such that the liquid mixture to be separated flows radially inwardly in the passage between each two adjacent separation discs of the stack.

A stack of separation discs is also disposed axially below the top disc.

As used herein, the term "axially" refers to a direction parallel to the axis of rotation (X). Accordingly, relative terms such as “above,” “upper,” “top,” “below,” “lower,” and “lower” refer to relative positions along the axis of rotation X. Correspondingly, the term “radially” denotes a direction extending radially from the axis of rotation X. Thus, a "radially inward position" refers to a position closer to the axis of rotation X as compared to a "radially outward position".

However, the top disk may have a larger outer radius than the separation disk of the disk stack to guide the separated heavy phase axially from the separation chamber and over the top disk. The top disk may also have a greater thickness compared to the separate disks of the disk stack.

Consequently, in an embodiment of the first aspect of the invention, the top disk has a greater thickness than the separator disk of the stack of separator discs.

In an embodiment, the top disk is integrated with the wall of the centrifuge rotor.

Thus, the top disk can be formed by, for example, the inner wall of the upper part of the centrifuge rotor.

The centrifugal separator may be arranged such that the separated heavy liquid phase moves towards the periphery of the separation chamber and is then guided along the upper side of the top disc to the first outlet.

The centrifugal separator also includes an inlet for the liquid mixture to be separated (liquid feed mixture). This inlet may include an inlet pipe extending into the centrifuge rotor. Also, this inlet pipe can be arranged on the axis of rotation X.

The first outlet for the heavy phase may be a liquid outlet or a sludge outlet. The centrifuge rotor may include, for example, a set of radial sludge outlets in the form of intermittently openable outlets on its periphery. These may be for discharge of higher density components such as sludge or other solids in the liquid feed mixture. In addition, the centrifuge rotor may include an open nozzle on the outer periphery through which a predetermined flow of sludge and/or heavy phase is continuously discharged.

The second outlet for the light phase is a liquid outlet. It is placed at a smaller radius than the first outlet.

As an example, the centrifugal separator may include a first liquid outlet for the heavy phase, a second liquid outlet for the light phase and a sludge outlet for the separated sludge.

The centrifugal separator may be arranged such that the separated heavy liquid phase moves towards the periphery of the separation chamber and is then guided along the upper side of the top disc to the first outlet.

Further, the second outlet is arranged in an outlet chamber integrated into the top disc such that the outlet chamber is arranged with its lowermost axial position being axially located below the uppermost axial position of the stack of separation discs. Thus, the second exit chamber can be arranged as a chamber integrated into the top disk.

Thus, according to the centrifugal separator according to the first aspect, the second outlet chamber is formed in the top disk so as to extend axially down into the stack of separation disks, for example down into a central position of the disk stack. The central part can therefore be formed within the inner radius of the separating disk of the disk stack.

As an example, the entire second outlet chamber can be arranged axially within a stack of separation discs. As an alternative, a part of the second outlet chamber, for example a lower part, can be arranged axially in a stack of separation discs.

A first aspect of the invention is to form a second outlet chamber integrated in the top disk so that it extends axially down into the stack of separation disks, the height of the rotor and thus the overall centrifuge height maintaining the separation capacity while It is based on the insight that it can be reduced. This provides the turns of the separator with a lower height relative to its width, which can be advantageous during rough weather at sea.

Also, as opposed to having the liquid outlet chamber integrated into the distributor, having the second outlet disposed within the outlet chamber integrated into the top disc, so that the level ring forming the inlet to the outlet chamber is formed around the entire circumference. can be opened at , providing less pressure drop. If the exit chamber is within the distributor, there may only be an opening or channel into the exit chamber, with sufficient solid material of the distributor between these openings to hold the parts together during operation.

In an embodiment of the first aspect, the second outlet comprises a stationary paring device for dispensing the light phase.

Thus, during operation, the liquid light phase may form a liquid body that rotates with the rotation within the second exit chamber, and a stationary pairing device disposed within the second exit chamber extracts the liquid light phase from the centrifuge through the second exit chamber. It can be arranged to pair. The stationary pairing device may be a pairing disk, such as an annular pairing disk.

As an example, the fairing device may be disposed axially at or below the uppermost axial position of the stack of separation discs. Accordingly, the second chamber may also extend axially down into the stack of separation disks such that the fairing device in the second exit chamber is disposed axially at or below the uppermost axial position of the stack of separation disks.

As an example, the fixed pairing device may be a pairing disk. Thus, this disk can extend about the axis of rotation X. However, the stationary pairing device may be any other type of outlet centrifugal pump.

In an embodiment, the separation disk comprises a central through hole with an inner radius R, so that the second outlet chamber can be integrated into the top disk to extend down into the opening formed by the central through hole of the separation disk.

In an embodiment of the first aspect of the present invention, the stack of separation disks comprises a first set of separation disks having a first inner radius R1 and a second set of separation disks having a second inner radius R2; , where R2>R1, and the lowermost axial position of the exit chamber is located radially within the second set of separation discs.

Thus, a second set of separation sets may surround the second exit chamber. That is, all or a lower portion of the second exit chamber may be in the same axial position as the second set, but radially disposed within the inner space radially defined in R2.

The second set may be disposed as the axially uppermost set of separation discs in the stack.

Thus, the inner radius of the uppermost separation disc may need to be enlarged, for example to obtain sufficient space for the second exit chamber to fit a desired pairing device therein.

By way of example, the second set includes at least 20 separation disks, such as at least 10 separation disks.

Also, R2 can be at least 10% greater than R1, such as at least 15%, such as at least 20%.

The first and second sets of separation discs may have the same outer radius.

Also, as mentioned above, the inlet may comprise an inlet pipe extending about the axis of rotation X into the centrifuge rotor. A second outlet chamber can be arranged around this inlet pipe. Thus, the inlet pipe can also extend within the opening formed by the central through hole of the set of separation discs.

In an embodiment of the first aspect of the invention, a stack of separation discs is disposed axially between the distributor and the top disc, and the distributor is arranged as a separate component from the top disc and the outlet chamber.

Thus, the stack of separation discs is supported by the distributor and can be axially compressed between the top disc and the distributor. A distributor is arranged to direct the liquid feed mixture from the inlet to the separation chamber. Accordingly, the distributor may include or form a set of channels for conducting the liquid feed mixture. These channels may be arranged to guide the feed radially outward. The inlet may include an inlet pipe extending through the distributor.

The distributor can be arranged as a separate part from the top disk and the outlet chamber for the liquid light phase, meaning that the outlet chamber for the liquid light phase is not integrated into the distributor, but only the top disk.

Consequently, in an embodiment, a stack of separation disks is axially disposed between the distributor and the top disk, the distributor arranged to guide the liquid feed mixture from the inlet to the separation chamber and as a separate part from the top disk and the outlet chamber. are placed

Thus, an outlet chamber for the second outlet can be arranged axially above the top of the distributor.

In an embodiment of the first aspect of the invention, the top disk further forms a radial level of the inlet from the separation chamber to the second outlet chamber. Thus, the radial level can be formed by a level ring integrated in the top disk, which level ring can be open around most of its circumference, for example around its entire circumference. Thus, a majority of that circumference can mean more than 50% of that circumference. As an example, the level ring may be open around more than 75% of its circumference, such as more than 90% of its circumference, such as open around the entire circumference.

The radial position of the interface between the heavy and light liquid phases formed in the centrifuge can be controlled by the radial position of the weir forming the overflow boundary from the separation chamber. Thus, the overflow boundary forms an inlet to the outlet chamber from which the separated phase can be discharged. Weirs on the light phase side are generally called level rings, and weirs on the heavy phase side are called gravity disks. Thus, the top disk can be arranged such that the level ring is integrated into the top disk. Thus, in an embodiment, the centrifugal separator does not include individual weirs or level rings to form a radial overflow boundary to the exit chamber for the liquid light phase, but these functions are instead integrated into the dimensions of the top disk.

An alternative way to control the interface position is to use one or both phase back pressure control. When the level ring is locked (not controlling the interface), there is still a positive effect because the outer walls of the fairing chamber block the turbulence caused by the fairing discs, and in this way the flow in the disc stack is not disturbed.

In an embodiment of the first aspect of the present invention, the centrifugal separator is for separating marine oil contaminants from bilge water on a ship.

Thus, the bilge water can form a separated liquid heavy phase, while the oil contaminants can exit the centrifuge as a liquid light phase.

Separators may be arranged so that the bilge water is safe to discharge on board after separation.

As a second aspect of the present invention, a method for separating impurities from an aqueous feed mixture is provided, the method comprising:

a) providing a centrifugal separator according to the first aspect and rotating a rotating part of the separator;

b) introducing the aqueous feed mixture into the separation chamber; and

c) discharging the purified aqueous phase and the separated impurities from the separator as two different phases.

This aspect may exhibit generally the same or corresponding advantages as the former aspect. The effects and features of this second aspect are largely similar to those described above with respect to the first aspect. The embodiments mentioned in connection with the first aspect are largely compatible with the second aspect.

Impurities may be in the oil phase. Impurities can be withdrawn via the second liquid outlet, while the purified aqueous phase can be withdrawn via the first outlet.

In an example of the second aspect, the aqueous feed mixture is the bilge water on the vessel.

Bilge water is collected in the ship's bilge well, which is located in the lowermost part of the ship just above the hull. Bilge water can contain fluids from machinery spaces, internal drainage systems, sludge tanks and a variety of other sources, and thus can contain water, detergents and other chemicals, fuel oils, lubricants, hydraulic oils, cat fines, oil additives. , soot and a mixture of dirt. Thus, the separated impurities may include, for example, fuel oil, lubricating oil, hydraulic oil, cat fines, oil additives, soot and/or dirt.

The foregoing and additional objects, features and advantages of the inventive concept will be better understood from the following illustrative and non-limiting specific description taken in conjunction with the accompanying drawings. In the drawings, like reference numbers will be used for like elements unless otherwise noted.
1 shows a schematic diagram of a centrifugal separator according to an embodiment of the present invention.
2 shows a schematic diagram of a cross-section of a centrifuge rotor.
Figure 3 shows further details of the top disc, the outlet for the light phase and the separation disc.
4 shows an embodiment of a separation disk.

A centrifugal separator according to the present disclosure will be further explained by the following description with reference to the accompanying drawings.

1 and 2 show a cross-section of an embodiment of a centrifugal separator 1 configured to separate heavy and light phases from a liquid feed mixture. The centrifugal separator 1 has a rotating part 4 comprising a centrifuge rotor 5 and a drive spindle 4a.

The centrifugal separator 1 is further provided with a drive motor 3 . This motor 3 may comprise, for example, a stationary element and a rotatable element, which surrounds and is connected to the spindle 4a and transmits a drive torque to the spindle 4a during operation and thus a circular motion. It is transmitted to the planting rotor (5). The drive motor 3 may be an electric motor. Alternatively, drive motor 3 may be connected to spindle 4a by transmission means. The transmission means may be in the form of a worm gear comprising elements connected to the pinion and spindle 4a to receive the drive torque. The transmission means may alternatively take the form of a propeller shaft, drive belt or the like, and the drive motor may alternatively be directly connected to the spindle 4a.

The centrifuge rotor 5 shown in more detail in FIG. 2 includes a spindle 4a rotatably disposed on the frame 2 about a vertical axis of rotation X in a lower bearing 22 and an upper bearing 21 is supported by A fixed frame (2) surrounds the centrifuge rotor (5).

The centrifuge rotor 5 forms within itself a separation chamber 9, in which the stack 10 of separation disks 10a is coaxially about the axis of rotation X and the upper disk ( 11) It is arranged axially below, and thus arranged to rotate with the centrifuge rotor (5). The separation disc 10a provides an efficient separation of the liquid mixture into at least a light phase and a heavy phase. The light phase may be a liquid light phase. Thus, in the separation chamber 9 during operation, for example, centrifugation of the liquid feed mixture takes place.

The separation chamber 9 is, in this embodiment, defined between the upper part 28 of the centrifuge rotor 5 , the distributor 13 and the axially movable action slide 18 .

The stack 10 is supported at its axially lowermost part by distributors 13 . The distributor 13 comprises an annularly conical base portion arranged to direct liquid from the center of the rotor to a predetermined radial level within the separation chamber 9 of the rotor, and a central neck portion extending upwardly from the base portion. .

The centrifugal separator 1 further comprises an inlet 14 in the form of a central inlet chamber formed in or below the distributor 13, into which a fixed inlet pipe 14a extends for the supply of the liquid feed mixture to be separated. do. The inlet 14 communicates with the separation chamber 9 through a passage 20 formed in the distributor 13.

The top disk 11 and the upper inner wall of the centrifuge rotor 5 have at least one channel extending from at least one radially outer part of the separation chamber 9 towards the central part of the centrifuge rotor 5. 25) is limited. The first outlet 6 is disposed within the first outlet chamber 15 in fluid communication with the at least one channel 25 for discharge of the separated liquid heavy phase. A stationary fairing device 16 in the form of a fairing disc is arranged in the outlet chamber 15 for the separated heavy phase to discharge the heavy phase into the outlet pipe 6a.

The radially inner portion of the disc stack 10 communicates with the second outlet 7 for the separated light phase of the liquid feed mixture. The second outlet 7 is arranged in a second outlet chamber 8 incorporated in the top disk 11 provided at the upper axial end of the disk stack 10 . The second outlet chamber 8 for the separated liquid light phase comprises a stationary fairing device 12 in the form of a fairing disk for the discharge of the light phase into the outlet pipe 7a. The fairing disc 12 is supported in the second outlet chamber 8 by a stationary inlet pipe 14a.

The centrifuge rotor 5 is further provided with an outlet 17 from the radial outer periphery of the separation chamber 9 . These outlets 17 are arranged for intermittent discharge of the sludge component of the liquid feed mixture which is uniformly distributed about the rotor axis X. The sludge component includes dense particles that form a sludge phase. The opening of outlet 17 is controlled by operating slide 18 actuated by operating water in channel 19 as is known in the art. In the position shown in the figure, the action slide 18 sealably abuts the upper part 28 of the centrifuge rotor 5 at its periphery, leaving the separation chamber 9 through the centrifuge rotor 5. and is closed from connection with the outlet 17 extending therethrough.

However, the centrifuge 1 may also be a solid wall bowl centrifuge, ie a centrifuge without an outlet at the periphery of the centrifuge rotor 5 .

During operation of the separator as shown in FIGS. 1 and 2 , the centrifuge rotor 5 is rotated by the drive motor 3 . Via the inlet pipe 14a, the liquid feed mixture to be separated is conveyed into the separation space 9. Depending on the density, the different phases in the liquid feed mixture are separated between the separation discs 10a of the stack 10 . Heavier components, such as the water phase and sludge phase, move radially outward between the separation discs 10a, while the least dense phases, such as the oil phase, move radially inward between the separation discs 10a. and is pressurized through the second outlet 7 disposed in the second liquid outlet chamber 8. Instead, the higher density liquid is discharged through the liquid outlet 6 for the heavy phase disposed at a radial distance greater than the radial level of the outlet 7 for the light phase. Thus, during separation, an intermediate phase between the lower and higher density liquids is formed radially within the separation chamber 9 , for example within a stack of separation discs. Solid or sludge accumulates in the sludge space at the periphery of the separation chamber 9, and is emptied intermittently from within the centrifuge rotor by opening the sludge outlet 17, as a result of which the sludge and a certain amount of fluid are released to the centrifugal force. is discharged from the separation chamber 17 by However, the discharge of the sludge can also take place continuously, in which case the sludge outlet 17 takes the form of an open nozzle, and a predetermined flow of sludge and/or heavy phase is continuously discharged by centrifugal force.

3 shows an enlarged view of the upper part of the stack 10 of the top disk 11 and the separate disks 10a. As shown in FIG. 3 , the second outlet 7 for the light image is arranged in an outlet chamber 8 integrated in the top disk 11 . Thus, in this embodiment, the second outlet chamber is arranged as a chamber in the top disk 11, ie the outlet chamber 8 and the top disk 11 form a single part. Also, as visualized, the exit chamber 8 for the light phase has its lowest axial position P1 axially below the uppermost axial position P3 of the stack 10 of the separation disks 10a. placed so that P3 is the axial position of the central through hole of the separation disc 10a arranged as the top disc in the disc stack 10 in this embodiment. Further, the stationary fairing disk 12 can be arranged axially below the uppermost axial position P3 of the stack 10 of the separating disks 10a. However, the stationary fairing disk 12 can be arranged at approximately the uppermost axial position P3 of the stack 10 of the separating disks 10a.

Thus, the outlet chamber 8 is integrated into the upper disk 11 between the axially upper position P2 and the axially lower position P1. In the embodiment, also the axially upper position P2 is located below the uppermost axial position P3 of the stack 10 of the separating disks 10a.

In order to make room for the integrated outlet chamber 8 in the top disk 11, the stack 10 of separation disks 10a has a first, lower portion of the separation disk 10a having a first inner radius R1. and a second, upper set 10c of separation discs 10a having a set 10b and a second inner radius R2. As shown in Figure 3, R2 is greater than R1 such that the lowermost axial position P1 of the outlet chamber 8 is located radially within the second, upper set 10c of the separation discs 10a.

In this example, the outer radii (R _outer ) of the first set 10b and the second set 10c of separation discs are the same.

The second set 10c may comprise at least 10 separation discs 10a, for example between 10 and 30 separation discs 10a. Also, the second set 10c is arranged as the axially uppermost set of the separation discs 10a in the stack 10 . In figure 3, only a few separation discs are shown. In total, the disc stack may include, for example, 80 to 180 separate discs.

A typical distance between the separation discs 10a created by the spacing members 21 may be less than 0.75 mm, such as less than 0.6 mm, such as about 0.5 mm. In an embodiment, the distance between the separation discs is between 0.4 and 0.75 mm, such as between 0.4 and 0.6 mm, such as between about 0.4 and 0.5 mm.

The separate disks 10a in the stack 10, ie in both the first set 10b and the second set 10c of disks, may have the same thickness. However, the top disk 11 may have a greater thickness than the separation disk 10a of the stack 10 . In addition, the upper disk 11 may have a larger radius (R _top ) than the radius (R _outer ) of the stack 10 of the separation disks 10a.

As also shown in FIG. 3 , the top disc 11 further forms a radial level r1 of the inlet from the separation chamber 9 to the second outlet chamber 8 . Accordingly, the level ring 30 is integrated into the top disc, i.e. the top disc 11 itself is the outer radial level of the passage 27 for conveying the separated liquid light phase to the outlet chamber 8, i.e. the overflow. form an exit According to the arrangement according to the invention, the level ring 30 can be opened around its entire circumference, thereby providing little pressure drop of the separated liquid light phase upon entry into the outlet chamber 8 . As shown in FIG. 3 , the outlet chamber 8 is disposed axially above the top of the distributor 13 .

In another embodiment, the top disk 11 is integrated into the wall of the centrifuge rotor 5 . As an example, the top disk may be formed on the inner wall of the upper part 28 of the centrifuge rotor 5 . And, a channel 25 extending from at least one radially outer portion of the separation chamber 9 toward a central portion of the centrifuge rotor 5 is a channel in the upper portion 28 of the centrifuge rotor 5 can be formed as

Figure 4 shows an example of a separation disk 10a that can be used in the stack 10 of separation disks. Separating disk 10a is a frusto-conical separator 22 with inner and outer parting surfaces around a central through hole 26 forming an inner radius R1.

Separator 22 is in the form of a straight elongated caulk 21 providing a distance for forming a passage between each two adjacent separator discs in stack 10 formed by the stack of separator discs 10a. A plurality of distance members of are provided. Although the cock 21 in Fig. 4 is formed at an angle with the radius of the disk 10a, the cock 21 can also be a straight radial cock, i.e. a cork that does not form an angle with the radius of the disk 10a. The cork is fastened to the outer surface of the frusto-conical separator of the disk 10a and is distributed around the circumference of the disk. A cork 21 may also or alternatively be provided on the inner surface of the disc. The coke may also be formed as an integral part of the disc 10a. The separation disc 10a is provided with a plurality of cuts in the form of slits 24 in the radially outer portion 23 of the separation disc 10a, the slits 24 opening towards the outer radius of the separation disc 10a. . The number of slits 24 corresponds to the number of cocks 21, and the slits are distributed around the circumference of the disc 10a between the cocks 21.

Additionally or supplementally, the separation disk 10a may have a plurality of through holes in the separation portion 22 . The cutouts and these through holes may be aligned in the stack 10 of separation discs 10a to form an axial distribution channel for the liquid feed mixture through the stack.

The present invention is not limited to the disclosed embodiments, but may be modified and modified within the scope of the claims set forth below. The present invention is not limited to the orientation of the axis of rotation X disclosed in the drawing. The term "centrifugal separator" also includes a centrifugal separator having a substantially horizontally oriented axis of rotation. Above, the concept of the present invention has been mainly explained with reference to a limited number of examples. However, as can be readily understood by a person skilled in the art, other examples than those disclosed above are equally possible within the scope of the inventive concept as defined by the appended claims.

Claims (15)

A centrifugal separator (1) configured to separate a heavy phase and a light phase from a liquid feed mixture,
It includes a frame 2, a driving member 3 and a rotating part 4,
The drive member 3 is configured to rotate the rotating part 4 relative to the frame 2 about the axis of rotation X,
The rotary part (4) comprises a centrifuge rotor (5) surrounding the separation chamber (9),
The separation chamber (9) comprises a stack (10) of separation disks (10a) arranged coaxially about the axis of rotation (X) and axially below the top disk (11);
The centrifuge 1 further has an inlet 14 for receiving the liquid feed mixture into the centrifuge rotor 5, a first outlet 6 for the heavy phase and a second outlet 7 for the light phase. contains,
The second outlet 7 is arranged in an outlet chamber 8 integrated in the top disk 11, which outlet chamber 8 has in its lowest axial position P1 the stack 10 of the separating disks 10a. The centrifuge (1) arranged to be axially located below the uppermost axial position (P3) of ). According to claim 1,
A stack (10) of separation discs (10a) is axially disposed between the distributor (13) and the top disc (11), which distributor (13) conducts the liquid feed mixture from the inlet (14) into the separation chamber (9). A centrifugal separator (1) arranged to do so and arranged as a separate part from the top disk (11) and the outlet chamber (8). According to claim 1 or 2,
A centrifuge (1) in which the second outlet (7) comprises a stationary fairing device (12) for discharging the light phase. According to claim 3,
The centrifugal separator (1), wherein the stationary pairing device (12) is disposed axially at or below the uppermost axial position (P3) of the stack (10) of separation discs (10a). According to claim 3 or 4,
The centrifugal separator (1) wherein the stationary pairing device (12) is a pairing disc. According to any one of claims 1 to 5,
The stack 10 of separation disks 10a comprises a first set 10b of separation disks 10a having a first inner radius R1 and a second set 10b of separation disks 10a having a second inner radius R2. A centrifugal separator (1) comprising a set (10c), wherein R2>R1, and the lowermost axial position (P1) of the outlet chamber (8) being located radially within the second set (10c) of said separation discs (10a). ). According to claim 6,
A centrifugal separator (1) in which the second set (10c) comprises at least ten separation discs (10a). According to claim 6 or 7,
The second set (10c) is arranged as the axially uppermost set of separation discs (10a) in the stack (10). According to any one of claims 1 to 8,
The centrifugal separator (1), wherein the upper disk (11) has a greater thickness than the separation disk (10a) of the stack (10) of the separation disks. According to any one of claims 1 to 9,
The centrifugal separator (1), wherein the top disk (11) further forms a radial level (r1) of the inlet from the separation chamber (9) to the second outlet chamber (8). According to claim 10,
The radial level (r1) is formed by a level ring (30) integrated in the top disc (11), said level ring (30) being open around most of its circumference. According to any one of claims 1 to 11,
The centrifuge (1), in which the upper disk (11) is integrated with the wall of the centrifuge rotor (5). According to any one of claims 1 to 12,
The centrifugal separator (1) is for separating marine oil contaminants from bilge water on ships. A process for separating impurities from an aqueous feed mixture,
a) providing a centrifugal separator (1) according to any one of claims 1 to 13, and rotating the rotating part (4) of the separator (1);
b) introducing the aqueous feed mixture into the separation chamber (9); and
c) discharging the purified aqueous phase and the separated impurities from the separator (1) as two different phases. According to claim 14,
The method of claim 1, wherein the aqueous feed mixture is the bilge water on the vessel.

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