Centrifugal Separation System and Methods for Operating Centrifugal Separators

Abstract

This document discloses a centrifuge (2). The separator includes a rotor (4) and a control system (30). The control system (30) includes a first pressure sensor and a second pressure sensor (34, 36) arranged at a first radial position and a second radial position in a separation space (8) of the rotor (4). The first pressure sensor and the second pressure sensor (34, 36) are positioned to be immersed in the process liquid during operation of the centrifuge (2). A control unit (32) of the control system is configured to determine parameters of the process liquid within the separation space (8) based on measurements from the first pressure sensor and the second pressure sensor (34, 36) during operation of the centrifuge (2).

Description

Technical Field

[0001] This invention relates to a centrifugal separation system and a method for operating a centrifugal separator. Background Technology

[0002] During the use of a centrifuge, parameters of the liquid feed mixture or its separated light and heavy phase components can be measured. These measured parameters can be used to monitor and / or control the separation of the liquid feed mixture into light and heavy phases.

[0003] US 7485084 discloses a centrifuge and a method for separating a product into a heavy phase and a light phase. A centrifuge rotor surrounds a closed separation space having a radially outer portion for the heavy phase, a radially inner portion for the light phase, and a central aeration space. The radially outer portion is separated from the radially inner portion by an interfacial liquid level. An inlet extends into the separation space for feeding the product. A first outlet extends from the radially outer portion for discharging the heavy phase. A second outlet extends from the radially inner portion for discharging the light phase. Control equipment allows the interfacial liquid level to be controlled to a desired radial position. Sensors sense parameters related to the gas pressure in the central space. The control equipment, in response to the sensed parameters, controls the back pressure in the first outlet to control the interfacial liquid level to the desired radial position.

[0004] US 3408000 discloses a centrifuge including two pipes extending into a sludge space within the separation space of the centrifuge rotor. Each pipe is hermetically connected to a fixed conduit extending from the separator. A pressure sensing device is arranged within the conduit. When a predetermined pressure differential is reached, sludge is discharged via a radially external sludge outlet in the rotor. Summary of the Invention

[0005] Indirect measurement of parameters of the process liquid within a centrifuge via gas or pipes and conduits may prove unreliable, or impossible for certain types of centrifuges.

[0006] Overcoming or at least mitigating at least one of the aforementioned disadvantages would be advantageous. In particular, it is desirable to provide reliable determination of parameters related to the separation of the liquid feed mixture within the centrifugal separator. To better address one or more of these problems, according to different aspects, a centrifugal separation system having the features defined in one of the independent claims, and a method of operating the centrifugal separator as defined in another independent claim, are provided.

[0007] According to one aspect of the invention, a centrifugal separation system is provided, comprising a centrifugal separator and a control system, the centrifugal separator being configured to separate a liquid feed mixture into a light phase and a heavy phase. The process liquid includes one or more of the liquid feed mixture, the light phase, and the heavy phase. The centrifugal separator includes a rotor configured to rotate about a vertical axis of rotation and having a separation space. The centrifugal separator further includes an inlet leading into the separation space, a light phase outlet leading out of the separation space, a heavy phase outlet leading out of the separation space, and a disc stack disposed within the separation space. The control system includes a first pressure sensor disposed at a first radial position within the separation space, and a control unit. The control system also includes a second pressure sensor disposed at a second radial position within the separation space. The first radial position is radially outside the second radial position, wherein the first and second pressure sensors are positioned to be immersed in the process liquid during operation of the centrifugal separator, and wherein the control unit is configured to determine parameters of the process liquid within the separation space based on measurements from the first and second pressure sensors during operation of the centrifugal separator.

[0008] Since the first and second pressure sensors are arranged at different radial positions in the separation space, and the first and second pressure sensors are immersed in the process liquid, and since the control unit is configured to determine the parameters of the process liquid in the separation space based on measurements from the first and second pressure sensors during operation of the centrifugal separator, conditions are provided for utilizing these parameters during operation of the centrifugal separation system.

[0009] According to another aspect of the invention, a method of operating a centrifugal separator is provided, the centrifugal separator being configured to separate a liquid feed mixture into a light phase and a heavy phase. The process liquid includes one or more of the liquid feed mixture, the light phase, and the heavy phase. The centrifugal separator includes a rotor configured to rotate about a vertical axis of rotation and provided with a separation space, an inlet leading into the separation space, a light phase outlet leading out of the separation space, a heavy phase outlet leading out of the separation space, a stack of separation discs arranged within the separation space, a first pressure sensor arranged at a first radial position in the separation space, and a second pressure sensor arranged at a second radial position in the separation space. The first radial position is radially outside the second radial position. The method includes the following steps:

[0010] - Rotating rotor,

[0011] - The liquid feed mixture is guided to the separation space via the inlet.

[0012] - Immerse the first and second pressure sensors in the process liquid.

[0013] -Measure the first pressure using the first pressure sensor.

[0014] - Measure the second pressure using a second pressure sensor, and

[0015] - Determine the parameters of the process liquid based on the first and second pressures.

[0016] Since the method includes the steps of immersing a first pressure sensor and a second pressure sensor in the process liquid, measuring a first pressure, measuring a second pressure, and determining parameters of the process liquid based on the first and second pressures, it provides conditions for utilizing the parameters during operation of a centrifuge and / or during operation of a system including a centrifuge.

[0017] Centrifuges can also be called disc stack centrifuges. Centrifuges can be high-speed centrifuges, in which the rotor rotates at a speed of one thousand or several thousand revolutions per minute (rpm) about a vertical axis of rotation. The rotor can also be called a separator rotor, separator bowl, or bowl.

[0018] The rotor can be arranged within a fixed housing of the centrifuge. The rotor can be driven by a drive arrangement including, for example, an electric motor, to rotate about a vertical axis of rotation.

[0019] During the separation of the liquid feed mixture into light and heavy phases, the heavy phase is collected in a circumferential portion at the perimeter of the separation space. The circumferential portion extends in the circumferential direction of the separator rotor and thus can form an imaginary ring or annulus within the separation space.

[0020] The liquid feed mixture may contain solid matter. This solid matter can be separated from the liquid feed mixture as part of a heavier phase. Thus, the heavier phase can form a solid matter suspension, such as a concentrated solid matter suspension. Alternatively, the solid matter contents can form part of a sludge phase, which exits the separation space via a sludge outlet. Another alternative is that the liquid feed mixture may include a liquid sludge phase that is heavier than the heavier phase. Again, in this latter alternative, the sludge phase can exit the separation space via a sludge outlet.

[0021] The term "process liquid" refers to all mixed or separated substances processed in a centrifuge during its operation. Therefore, the term "process liquid" encompasses every liquid feed mixture and its components, including any solid particles, i.e., the light phase, the heavy phase, and sludge (if present).

[0022] The parameters of the process liquid can be, for example, the pressure difference between measurements from the first and second pressure sensors, the radial position of the interface between the light and heavy phases, or the density of the heavy phase.

[0023] Immersing the first and second pressure sensors means that at least the pressure-sensitive portions of both sensors are submerged in the process liquid. In other words, the first and second pressure sensors are mounted in the rotor or its components such that, during centrifugal separator operation, at least the pressure-sensitive portions of the sensors are covered by the process liquid.

[0024] A first pressure sensor is configured to communicate with a control unit. A second pressure sensor is configured to communicate with a control unit. Since the first and second pressure sensors are arranged at radial positions in the separation space, they are naturally arranged within the rotor and thus arranged to rotate with the rotor. Furthermore, the control unit can be arranged within the rotor and also arranged to rotate with the rotor.

[0025] According to an embodiment, the centrifugal separation system may include a flow control component, wherein the control unit may be configured to control the flow control component based on parameters. In this way, determined parameters can be used during operation of the centrifugal separation system. The flow control component may control one or more of the flow of the liquid feed mixture, the light phase, and / or the heavy phase.

[0026] According to an embodiment, the rotor may include nozzles disposed at the outer periphery of the rotor. The nozzles may form a heavy phase outlet or a sludge outlet. The flow control component may include a sliding bowl bottom configured to open and close the nozzles. In this way, the control unit can control the injection of the separated heavy phase and / or separated sludge from the separation space via the nozzles by controlling the sliding bowl bottom based on determined parameters. Therefore, the injection of the heavy phase and / or sludge can be performed as needed based on specific values ​​of, for example, determined parameters, rather than at regular intervals. The latter may result in the light phase being injected together with the heavy phase, or the heavy phase being injected together with the sludge, or the heavy phase or sludge accumulating within the separation space. Therefore, by controlling the sliding bowl bottom based on determined parameters, less product is wasted, and nozzle clogging can be prevented.

[0027] According to an embodiment, a first pressure sensor may be arranged radially outside the separation disc stack. In this way, the first pressure sensor can measure the pressure taking into account the heavy phase and / or sludge accumulated in the separation space radially outside the separation disc stack. Therefore, the determined parameters can reflect the measurement affected by the heavy phase and / or sludge in the separation space.

[0028] According to an embodiment, a second pressure sensor may be arranged radially outside the separation disc stack. In this way, the second pressure sensor can measure the pressure taking into account the heavy phase and / or sludge accumulated in the separation space radially outside the separation disc stack. The determined parameters may reflect, for example, the degree of filling of the separation space by the heavy phase and / or sludge, or the density of the heavy phase and / or sludge.

[0029] According to an embodiment, the second pressure sensor can be arranged radially within the separation disc stack or radially inward of the separation disc stack. In this way, the second pressure sensor can measure the pressure taking into account the light phase separated in the separation space, either radially within or radially inward of the separation disc stack. Therefore, the determined parameters can reflect the measurement affected by the light phase in the separation space. The determined parameters can reflect, for example, the degree of filling of the separation space by the heavy phase and / or sludge.

[0030] According to an embodiment, the control system may include a third pressure sensor disposed at a third radial position in the separation space, wherein the third radial position is radially between the first radial position and the second radial position, and wherein the control unit is configured to determine another parameter of the process liquid within the separation space based on measurements from at least one of the first and second pressure sensors and the third pressure sensor during operation of the centrifuge. In this way, conditions are provided for utilizing the other parameter determined during operation of the centrifuge and / or during operation of the system including the centrifuge.

[0031] Another parameter of the process liquid can be, for example, the pressure difference between measurements from the first and second pressure sensors, the radial position of the interface between the light and heavy phases, or the density of the heavy phase.

[0032] According to another aspect of the invention, a computer program comprising instructions is provided that, when executed by a computer, cause the computer to perform a method according to any of the aspects and / or embodiments discussed herein.

[0033] According to another aspect of the invention, a computer-readable storage medium including instructions is provided that, when executed by a computer, causes the computer to perform a method according to any of the aspects and / or embodiments discussed herein.

[0034] Further features and advantages of the invention will become apparent when examined in light of the appended claims and the following detailed description. Attached Figure Description

[0035] Aspects and / or embodiments of the present invention, including their specific features and advantages, will be readily understood from the exemplary embodiments discussed in the following detailed description and accompanying drawings, wherein:

[0036] Figures 1 to 3 An embodiment of a centrifugal separator is schematically illustrated.

[0037] Figure 4 A cross-section of a portion of a centrifuge according to an embodiment is schematically illustrated.

[0038] Figures 5a to 5e The illustration shows a cross-section of an embodiment of the rotor of a centrifugal separator.

[0039] Figure 6 The control system according to an embodiment is illustrated.

[0040] Figure 7 An embodiment of a method for operating a centrifuge is illustrated, and

[0041] Figure 8 A computer-readable storage medium according to an embodiment is illustrated. Detailed Implementation

[0042] The various aspects and / or embodiments of the invention will now be described more fully. The same numerals always refer to the same elements. For the sake of brevity and / or clarity, well-known functions or constructions need not be described in detail.

[0043] Figure 1 An embodiment of a centrifugal separation system 1 is schematically illustrated. The centrifugal separation system 1 includes a centrifugal separator 2 and a control system 30. The centrifugal separator 2... Figure 1 It is shown in the cross-sectional view.

[0044] Centrifuge 2 is configured to separate a liquid feed mixture into a light phase and a heavy phase. Centrifuge 2 includes a rotor 4. The rotor 4 is configured to rotate about a vertical axis of rotation 6 and is provided with a separation space 8. Centrifuge 2 further includes an inlet 10 leading into the separation space 8, a light phase outlet 12 leading out of the separation space 8, a heavy phase outlet 14 leading out of the separation space 8, and a stack 16 of truncated conical separation discs 18 arranged inside the separation space 8.

[0045] The rotor 4 can be driven to rotate by the drive arrangement 19. In the illustrated embodiment, the drive arrangement 19 includes a main shaft 20 and an electric motor 22. The rotor 4 is attached to the main shaft 20. The main shaft 20 forms part of the electric motor 22, meaning that the rotor 4 is directly driven by the electric motor 22. Alternatively, the drive arrangement 19 may include a main shaft connected to the rotor, an electric motor, and a transmission device arranged between the electric motor and the main shaft. Thus, the drive arrangement 19 can rotate the rotor 4 about a vertical axis of rotation 6. The rotor 4 is rotatably mounted inside the housing 24 of the centrifuge 2.

[0046] During the separation of the liquid feed mixture in the separation space 8 of rotor 4, the liquid feed mixture is introduced into the separation space 8 from the center of rotor 4 via inlet 10. The liquid feed mixture is separated into a light phase and a heavy phase. The separated light phase flows radially inward between the separation discs 18 toward the vertical axis of rotation 6 and exits rotor 4 via light phase outlet 12. The separated heavy phase flows radially outward between the separation discs 18 toward the perimeter of the separation space 8 and exits rotor 4 via heavy phase outlet 14. In this document, each of the liquid feed mixture, the heavy phase, and the light phase is included in the term "process liquid".

[0047] Centrifuges of this type are known and come in various different types and sizes. This invention is generally applicable to different types and sizes of such centrifuges. Unless specifically stated, for example, with reference to certain embodiments, the invention is not limited to the type and arrangement of inlet 10, light phase outlet 12, and heavy phase outlet 14. Inlet 10 and outlets 12, 14 can be open, and / or mechanically sealed, and / or provided with a paring disc. They can be as follows: Figure 1 As shown, it is located at the upper end of rotor 4, and / or as... Figure 2 and Figure 3 The arrangement shown is located at the lower end of rotor 4 and / or at the outer perimeter of rotor 4.

[0048] As mentioned above, the centrifugal separation system 1 includes a control system 30. The control system 30 includes a control unit 32, a first pressure sensor 34 disposed at a first radial position in the separation space 8, and a second pressure sensor 36 disposed at a second radial position in the separation space 8. The first radial position is radially outside the second radial position. The first pressure sensor 34 and the second pressure sensor 36 are positioned to be immersed in the process liquid during operation of the centrifuge.

[0049] The first pressure sensor 34 and the second pressure sensor 36 are configured to communicate with the control unit 32. For example, pressure measurements from the first pressure sensor 34 and the second pressure sensor 36 can be transmitted to the control unit 32. The control unit 32 is configured to determine parameters of the process liquid within the separation space 8 based on the measurements from the first pressure sensor 34 and the second pressure sensor 36 during operation of the centrifuge 2. As described above, each of the liquid feed mixture, the heavy phase, and the light phase is included in the term "process liquid".

[0050] Each of the first pressure sensor 34 and the second pressure sensor 36 is configured to measure pressure. The first pressure sensor 34 is configured to measure the pressure of the process liquid. The second pressure sensor 36 is configured to measure the pressure of the process liquid.

[0051] As mentioned above, the control unit 32 is configured to determine parameters of the process liquid within the separation space 8 based on measurements from the first pressure sensor 34 and the second pressure sensor 36 during operation of the centrifuge 2. These parameters can be used directly or indirectly during operation of the centrifuge 2 and / or during operation of the separation system 1.

[0052] According to an embodiment, the parameter can be the pressure difference between the first pressure sensor 34 and the second pressure sensor 36. In this way, conclusions can be drawn from the pressure difference associated with the process liquid in the separation space 8. For example, the radial location of the interface between the light and heavy phases and / or the interface between the sludge and the heavy phase can be determined.

[0053] According to an embodiment, the parameter can be the density of the process liquid. In this way, the density of the process liquid can be taken into account during the operation of the centrifuge 2 and / or during the operation of the separation system 1 including the centrifuge 2. For example, the density of the heavy phase can be taken into account when determining the radial position of the interface between the light and heavy phases.

[0054] More specifically, the control unit 32 can calculate the density of the process liquid radially present between the first pressure sensor 34 and the second pressure sensor 36 by using pressure readings from sensors 34 and 36—which depend on the rotational speed of rotor 4 and the radial position of sensors 34 and 36—given the force acting on the process liquid. For example, the density can be calculated using the following formula:

[0055]

[0056] Where p1 and p2 are the pressures measured by the corresponding first pressure sensor 34 and second pressure sensor 36, in bar, w is the rotor speed in rad / s, and rp1 and rp2 are the corresponding radial positions of the first pressure sensor 34 and the second pressure sensor 36 in millimeters (mm).

[0057] As mentioned by way of example, in order to determine the density of the heavy phase or sludge, the heavy phase or sludge may be allowed to extend radially over the first pressure sensor 34 and the second pressure sensor 36. Once the density is determined, the first and second pressure sensors can be used to determine the radial location of the interface between the light and heavy phases and / or the interface between the sludge and the heavy phase.

[0058] Similarly, at the start of the separation operation, before any large amount of heavy phase or sludge accumulates in the separation space 8, the density of the light phase can be determined. Only the light phase extends radially along the first pressure sensor 34 and the second pressure sensor 36, and the density of the light phase can then be calculated.

[0059] The centrifugal separation system 1 may include at least one flow control component 38, 40. The control unit 32 may be configured to control the flow control component 38, 40 based on the parameters stated therein. The flow control component can be used to control the process liquid flow. This can be advantageous during normal operation of the centrifugal separator 2, but may also be used, or alternatively, during specific operational phases of the centrifugal separator 2, such as during startup of the centrifugal separator 2 and / or during the separation of the liquid feed mixture. Non-limiting examples of various flow control components are discussed below.

[0060] According to an embodiment, the centrifugal separation system 1 may include a heavy phase valve 38 disposed in the heavy phase outlet 14, wherein the flow control component includes the heavy phase valve 38. In this way, the control unit 32 can control the heavy phase flow through the heavy phase outlet 14. The heavy phase valve 38 may be a shut-off valve having only open and closed positions. Alternatively, the heavy phase valve 38 may be a proportional valve configured to control the flow rate through it.

[0061] According to an embodiment, the centrifugal separation system 1 may include a light phase valve 40 disposed in a light phase outlet 12, wherein the flow control component includes the light phase valve 40. In this way, the control unit 32 can control the light phase flow through the light phase outlet 12. The light phase valve 40 may be a shut-off valve having only open and closed positions. Alternatively, the light phase valve 40 may be a proportional valve configured to control the flow rate through it.

[0062] The heavy phase valve 38 and / or the light phase valve 40 can be arranged in or on the rotor 4 to rotate together with the rotor 4, such as Figure 1 The location of the heavy phase valve 38 is shown. Alternatively, the heavy phase valve 38 and / or the light phase valve 40 can be arranged further downstream of the fixed portion of the respective outlets 14, 12, as shown. Figure 1 The position of the medium-light phase valve 40 is shown.

[0063] exist Figure 1 In one embodiment, the control unit 32 of the control system 30 is arranged in the rotor 4. Alternatively, the control unit 32 may be arranged in a fixed part of the centrifuge 2, or as... Figure 2 As in the embodiments, it is part of the centrifugal separation system 1 outside the centrifugal separator 2, or as... Figure 3 As in the embodiments described above, the control unit can be a distributed control unit 32, 32'.

[0064] Figure 2 An embodiment of the centrifugal separation system 1 is schematically illustrated. The centrifugal separation system 1 is very similar to... Figure 1 Centrifugal separation system 1. Therefore, the differences between the embodiments will be discussed mainly below.

[0065] Similarly, centrifuge 2 is configured to separate a liquid feed mixture into a light phase and a heavy phase. Centrifuge 2 includes a rotor 4 configured to rotate about a vertical axis 6. Centrifuge 2 further includes an inlet 10 leading into a separation space 8 and a light phase outlet 12 leading out of the separation space 8. Stacks of separation discs 18 are arranged inside the separation space 8.

[0066] As mentioned by way of example, mechanism 44 may include a sliding element removable by an actuator. The sliding element is configured to slide between a position where at least one nozzle is open and a position where at least a portion of at least one nozzle 42 is covered.

[0067] Similarly, the centrifugal separation system 1 includes a control system 30, which includes a control unit 32, a first pressure sensor 34 arranged at a first radial position in the separation space 8, and a second pressure sensor 36 arranged at a second radial position in the separation space 8.

[0068] Centrifuge 2 includes a heavy phase outlet 14 extending from separation space 8. In these embodiments, the heavy phase outlet 14 includes nozzles 42 arranged at the outer periphery of rotor 4. In this way, a liquid feed mixture with a large heavy phase content can be separated in centrifuge 2. During operation of centrifuge 2, at least one of the nozzles 42 is always at least partially open. Therefore, during operation of centrifuge 2, the heavy phase is continuously injected through one or more of the nozzles 42.

[0069] According to an embodiment, the centrifugal separator 2 includes a flow control component, which may include a mechanism 44 for changing the total opening area of ​​the nozzle 42. In this way, the separated heavy phase flow through the heavy phase outlet 14 can be controlled.

[0070] Therefore, the control unit 32 can be configured to control the mechanism 44 based on the parameters. Thus, the separated heavy phase flow through the nozzle 42 at the heavy phase outlet 14 can be controlled based on the parameters. As mentioned only by way of example, the position of the interface between the light and heavy phases in the separation space 8 can form a parameter for controlling the total opening area of ​​the nozzle 42.

[0071] exist Figure 2 In some embodiments, the control unit 32 of the control system 30 is arranged in a fixed part of the centrifuge 2, or as part of the centrifuge separation system 1 outside the centrifuge 2. Pressure sensors 34, 36 communicate wirelessly with the control unit 32 directly or via a transmitter or transceiver (not shown) arranged in the rotor 4. Alternatively, as... Figure 1 As in the embodiment, the control unit 32 of the control system 30 can be arranged in the rotor 4, or as in the embodiment. Figure 3As in the embodiments described above, the control unit can be a distributed control unit 32, 32'.

[0072] Figure 3 An embodiment of the centrifugal separation system 1 is schematically illustrated. The centrifugal separation system 1 is very similar to... Figure 1 and 2 Centrifugal separation system 1. Therefore, the differences between the embodiments will be discussed mainly below.

[0073] Similarly, centrifuge 2 is configured to separate a liquid feed mixture into a light phase and a heavy phase. Centrifuge 2 includes a rotor 4 configured to rotate about a vertical axis 6. Centrifuge 2 further includes an inlet 10 leading into a separation space 8 and a light phase outlet 12 leading out of the separation space 8. Stacks of separation discs 18 are arranged inside the separation space 8.

[0074] Similarly, the centrifuge 2 includes a control system 30, in which the control system 30 includes at least two control units 32, 32', a first pressure sensor 34 arranged at a first radial position in the separation space 8, and a second pressure sensor 36 arranged at a second radial position in the separation space 8.

[0075] Similarly, the centrifugal separator 2 includes a heavy phase outlet 14 extending from the separation space 8, and the heavy phase outlet 14 includes a nozzle 42 arranged at the outer periphery of the rotor 4.

[0076] In these embodiments, the flow control component includes a slidable bowl bottom 46 configured to open and close the nozzle 42. In this way, the separated heavy phase is ejected only when the slidable bowl bottom 46 opens the nozzle 42. In other words, the heavy phase outlet 14 opens only when the slidable bowl bottom 46 is in the open position of the nozzle 42. The slidable bowl bottom itself and its operating mechanism are known in the art.

[0077] At least one of the control units 32, 32' can be configured to control the sliding bowl bottom 46 based on the parameters. Therefore, the separated heavy phase flow through the nozzle 42 at the heavy phase outlet 14 can be controlled based on the parameters. As mentioned by way of example, the position of the interface between the light and heavy phases in the separation space 8 can form parameters for controlling the opening and closing of the nozzle 42.

[0078] According to further embodiments, such as in combination Figure 1 The centrifuge 2 discussed includes a light phase outlet 12 and a heavy phase outlet 14. The centrifuge 2 further includes a sludge outlet, wherein the sludge outlet includes nozzles 42 arranged at the outer periphery of the rotor 4. That is, the sludge outlet includes a combination of... Figure 3The nozzle 42 under discussion. More specifically, instead of forming a heavy phase outlet, the nozzle 42 forms a sludge outlet. The flow control components include a slidable bowl bottom 46 configured to open and close the nozzle 42, and are controlled by at least one of the control units 32, 32' for intermittently ejecting sludge from the separation space 8.

[0079] At least one of the control units 32, 32' can be configured to control the sliding bowl bottom 46 based on the parameters. Therefore, the sludge flow through the nozzle 42 at the sludge outlet can be controlled based on the parameters. As mentioned by way of example, the position of the interface between the sludge and the heavy phase in the separation space 8 can form parameters for controlling the opening and closing of the nozzle 42.

[0080] exist Figure 3 In some embodiments, the control system 30 is a distributed control system including control units 32, 32', that is, the control system 30 includes more than one control unit 32, 32', for example, one control unit 32 arranged in the rotor 4 and one control unit 32' arranged in the fixed part of the centrifuge 2, or as part of the centrifuge separation system 1 outside the centrifuge 2. The more than one control unit 32, 32' can perform different tasks, such as control tasks, computing tasks, and communication tasks. Alternatively, as Figure 1 As in the embodiment, the control unit 32 of the control system 30 can be arranged in the rotor 4, or as in the embodiment. Figure 2 As in the embodiments described, the control unit 32 may be arranged in a fixed part of the centrifugal separator 2, or as part of the centrifugal separation system 1 outside the centrifugal separator 2.

[0081] Figure 4 A cross-section of a portion of the centrifuge separator 2 of the centrifugal separation system 1 according to an embodiment is schematically illustrated. The centrifugal separation system 1 is very similar to Figures 1 to 3 The centrifugal separation system 1 of the embodiments and the embodiment including the sludge outlet discussed above are described below. Therefore, the differences between the embodiments will be discussed mainly below.

[0082] In these embodiments, the heavy phase outlet 14 includes at least one channel 48 extending within the rotor 4 from the radially outer portion of the separation space 8 toward the central portion of the rotor 4. The heavy phase outlet 14 is mechanically sealed between the rotor 4 and the stationary portion of the centrifugal separator 2.

[0083] The liquid flows through centrifuge 2. Figure 4The liquid feed mixture enters the rotor 4 through inlet 10 in the lower part of the rotor 4 and flows into the separation space 8. In the separation space 8, the liquid feed mixture is separated into a light phase that flows out of the rotor through light phase outlet 12 and a heavy phase that flows out of the rotor 4 through heavy phase outlet 14. Inlet 10 and light phase outlet 12 are also mechanically sealed.

[0084] The at least one channel 48 may comprise a tube, i.e., the at least one channel 48 having the same cross-sectional area along its extension. Alternatively, the at least one channel 48 may comprise a passage having a larger cross-sectional area in the radially outer portion of the separation space 8 compared to the central portion toward the rotor 4.

[0085] Similarly, in these embodiments, the centrifuge 2 includes nozzles 42 arranged at the outer periphery of the rotor 4. A flow control component including a sliding bowl bottom 46 is provided for opening and closing the nozzles 42.

[0086] In these embodiments, depending on the contents of the liquid feed mixture and the phase obtained from it, the nozzle 42 may form part of any one of a heavy phase outlet, a sludge outlet, or a combination of a sludge and heavy phase outlet.

[0087] Similarly, the control unit 32 can be configured to control the sliding bowl bottom 46 based on the parameters. Therefore, the ejection of the heavy phase and / or sludge through the nozzle 42 can be controlled. As mentioned by way of example, the location of the interface between the sludge and the heavy phase, or the location of the interface between the heavy phase and the light phase, in the separation space 8 can form parameters for controlling the opening and closing of the nozzle 42.

[0088] Figures 5a to 5e The illustration shows a cross-section of an embodiment of the rotor 4 of the centrifuge, such as the one shown in the above reference. Figures 1 to 4 Centrifuge separator 2 is a part of the centrifugal separation system 1 discussed. Figures 5a to 5e The diagram schematically illustrates the different positions and numbers of pressure sensors arranged in the rotor 4. Figures 5a to 5e The rotor 4 shown is provided with a heavy phase outlet arranged toward the center of the rotor 4. However, the embodiment is not limited to this rotor 4. Alternatively, the rotor 4 may have a heavy phase outlet at its radial outer perimeter, or the rotor 4 may additionally have a sludge outlet at its radial outer perimeter, as referenced above. Figures 2 to 4 The subject of discussion.

[0089] Centrifugal separation system 1 includes control system 30, as shown in the reference above. Figures 1 to 4 And the following references Figure 6 The control unit 32 of the control system 30, as discussed above, is shown arranged in the rotor 4, but the control unit 32 can be arranged as referenced above. Figures 1 to 4 Any of the embodiments discussed, or any other suitable manner. Reference will be made to... Figures 5a to 5e Various example embodiments of the control system 30 are further discussed. Similarly, the control system 30 includes one or more control units 32, a first pressure sensor 34, and a second pressure sensor 36. The first pressure sensor 34 and the second pressure sensor 36 are arranged at different radial positions within the separation space 8 such that they can obtain pressure readings from the process fluid within the separation space 8.

[0090] As described above, the first pressure sensor 34 and the second pressure sensor 36 are configured to communicate with the control unit 32, and the control unit 32 is configured to determine the parameters of the process liquid in the separation space 8 based on measurements from the first pressure sensor 34 and the second pressure sensor 36 during operation of the centrifuge 2.

[0091] In this document, the term "radial outer edge of the separator disk stack" corresponds to the radial position outside the radial extension of the separator disk stack. The term "radial inner edge of the separator disk stack" corresponds to the radial position within the radial extension of the separator disk stack, i.e., the radial position between the inner and outer radii of the separator disk stack. The term "radial inner edge of the separator disk stack" corresponds to the radial position within the inner radius of the separator disk stack.

[0092] according to Figures 5a to 5c and Figure 5e In the embodiment shown, the first pressure sensor 34 can be arranged radially outside the stack 16 of separation discs 18. Therefore, the first pressure sensor 34 can measure the pressure in a portion of the rotor 4 and separation space 8 where the separated heavy phase and / or separated sludge accumulates during centrifugal separator operation. Thus, the determined parameters can reflect measurements affected by the heavy phase and / or sludge in the separation space.

[0093] according to Figure 5a and Figure 5b In the illustrated embodiment, the second pressure sensor 36 can be arranged radially outside the stack 16 of separation discs 18. Therefore, because the second pressure sensor 36 is arranged radially inside the first pressure sensor 34, the second pressure sensor 36 can measure the pressure in the separation space 8, which, under some conditions during centrifugal separator operation, is affected by the separated heavy phase and / or sludge, and under other conditions during centrifugal separator operation, is affected by the liquid feed mixture or the separated light phase. Thus, the determined parameter can reflect, for example, the degree of filling of the separation space by the heavy phase and / or sludge, or the density of the heavy phase and / or sludge.

[0094] As mentioned as an example, in Figure 5a and Figure 5bIn some embodiments, the parameter can be the pressure difference between the first pressure sensor 34 and the second pressure sensor 36. For example, monitoring the pressure difference via the control unit 32 will provide information about the radial location of the interface between the light and heavy phases and / or the interface between the sludge and the heavy phase in the separation space 8.

[0095] exist Figure 5a In this embodiment, the first pressure sensor 34 is located at or near the outermost radial position within the separation space 8, and the second pressure sensor 36 is positioned toward the stack 16. During operation of the centrifuge, a specific pressure difference may correspond to a specific radial position of the interface. If the pressure difference remains constant within a certain pressure difference range during operation of the centrifuge, this indicates that the radial position of the interface remains constant. If the pressure difference remains constant at the maximum pressure difference value, this indicates that the interface is located radially inward of the second pressure sensor 36.

[0096] exist Figure 5b In this embodiment, the first pressure sensor 34 and the second pressure sensor 36 are positioned close to each other radially outside the separation disks 18 stack 16 within the separation space 8. During operation of the centrifuge, the pressure difference between the first pressure sensor 34 and the second pressure sensor 36 remains constant until the interface reaches the first pressure sensor 34. Once the interface passes the first pressure sensor 34 and is thus positioned between the first pressure sensor 34 and the second pressure sensor 36, the pressure difference begins to increase. This is an indication of the radial position of the interface between the first pressure sensor 34 and the second pressure sensor 36. Such changes in pressure difference can be used by the control system to control the centrifuge, for example, by opening the nozzles of the rotor 4 by operating the sliding bowl bottom of the rotor 4.

[0097] As mentioned by way of example, the radial distance between the first pressure sensor 34 and the second pressure sensor 36 can be in the range of 8-50 mm, or in the range of 10-30 mm. The greater the density difference between the light phase and the heavy phase, the smaller the distance between the first pressure sensor and the second pressure sensor can be.

[0098] According to, especially in Figures 5c to 5e and Figure 1 In the embodiment shown, the second pressure sensor 36 may be radially arranged within the stack 16 of the separation discs 18 or radially inward of the stack 16 of the separation discs 18. More specifically, in Figure 5c In the middle, the second pressure sensor 36 is radially arranged within the stack 16, and... Figure 1 In one embodiment, the second pressure sensor 36 is arranged radially within the stack 16.

[0099] The second pressure sensor 36 can measure the pressure of the light phase separated in the separation space 8 radially within or radially inside the stack of separation discs 18 16. Therefore, the determined parameters can reflect the measurement influenced by the light phase in the separation space. The determined parameters can also reflect, for example, the degree of filling of the separation space by the heavy phase and / or sludge.

[0100] As mentioned as an example, in Figure 5c In this embodiment, the parameter can be the pressure difference between the first pressure sensor 34 and the second pressure sensor 36. Monitoring this pressure difference will provide information about the radial position of the interface between the light and heavy phases. For example, during the operation of a centrifuge, a particular pressure difference may correspond to a specific radial position of the interface.

[0101] According to, especially in Figure 5d In the embodiment illustrated in the figure, a first pressure sensor 34 can be radially arranged within the stack 16 of separation discs 18. In this way, pressure differences across the stack 16 or a portion thereof can be monitored. If the pressure difference exceeds a threshold level, a conclusion can be drawn regarding blockage of the stack 16 of separation discs 18.

[0102] according to Figure 5e In the embodiment illustrated in the figure, the control system 40 may include a third pressure sensor 50 disposed at a third radial position in the separation space 8, wherein the third radial position is radially between the first radial position and the second radial position, and wherein the control unit 32 is configured to determine another parameter of the process liquid within the separation space 8 based on measurements from at least one of the first pressure sensor 34 and the second pressure sensor 36 and the third pressure sensor 50 during operation of the centrifuge.

[0103] The further determined parameters can be used during the operation of the centrifuge and / or the system including the centrifuge. These further parameters can be, for example, pressure differences or densities in the process liquid components. Therefore, these further parameters can be, for example, the pressure difference between the first pressure sensor 34 and the third pressure sensor 50, the pressure difference between the third pressure sensor 50 and the second pressure sensor 36, or densities measured based on pressures from the first pressure sensor 34 and the third pressure sensor 50. In the latter case, it is suitable that the third radial position is radially outside the stack 16 of the separation discs 18.

[0104] When the pressure difference between the first pressure sensor 34 and the third pressure sensor 50 no longer changes, the density based on the pressure measurements from the first pressure sensor 34 and the third pressure sensor 50 can be calculated during the operation of the centrifuge. This means that the radial distance between the first pressure sensor 34 and the third pressure sensor 50 is filled with heavy phase or sludge. As discussed above, the density of the heavy phase or sludge can be calculated using knowledge of the radial positions of the first pressure sensor 34 and the third pressure sensor 50, the rotational speed of the rotor 4, and the pressure difference between the first pressure sensor 34 and the third pressure sensor 50.

[0105] Figure 6 The diagram illustrates a control system 30 according to an embodiment, to be utilized in conjunction with different aspects and / or embodiments of the invention. The control system 30 is also... Figures 1 to 5e The control system 30 includes at least one control unit 32, which can take the form of substantially any suitable type of processor circuitry or microcomputer, such as circuitry for digital signal processing (digital signal processor, DSP), central processing unit (CPU), processing unit, processing circuitry, processor, application-specific integrated circuit (ASIC), microprocessor, or other processing logic capable of interpreting and executing instructions. The expression "control unit" used herein can refer to a processing circuitry comprising multiple processing circuits, such as any, some, or all of the processing circuits mentioned above. The control system 30 includes a memory unit 53. The control unit 32 is connected to the memory unit 53, which provides the control unit 32 with, for example, stored program code, data tables, and / or other stored data that the control unit 32 requires to enable it to perform calculations and control the centrifuge, and optionally control a system including the centrifuge. The control unit 32 is also adapted to store portions or final results of calculations in the memory unit 53. The memory unit 53 may include physical devices for temporarily or permanently storing data or programs (i.e., sequences of instructions). According to some embodiments, the memory unit 53 may include an integrated circuit comprising silicon-based transistors. In different embodiments, memory unit 53 may include, for example, a memory card, flash memory, USB memory, hard disk, or other similar volatile or non-volatile memory units for storing data, such as, for example, ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable PROM), EEPROM (Electrically Erasable PROM), etc.

[0106] The control system 30 further includes a first pressure sensor 34 and a second pressure sensor 36. Alternatively, the control system 30 may include a third pressure sensor 50. The control unit 32 communicates with the pressure sensors 34, 36, and 50 and receives pressure measurements from these sensors. The control unit 32 is configured to receive output signals from the sensors 34, 36, and 50. These signals may include waveforms, pulses, or other attributes that can be detected as information by the control unit 32 and can be directly or indirectly converted into signals that can be processed by the control unit 32. Each connection to a corresponding sensor may take the form of one or more of a cable, a data bus (e.g., a CAN (Controller Area Network) bus), a MOST (System Transmission for Media) bus, or some other bus configuration or wireless connection. In the depicted embodiment, only one control unit 32 and memory 53 are shown, but the control system 30 may alternatively include more than one control unit and / or memory.

[0107] like Figures 1 to 5e As indicated, control unit 32 may be disposed within rotor 4. Alternatively, control unit 32 may be disposed outside rotor 4 and may communicate wirelessly with sensors 34, 36, 50, for example. In embodiments including more than one control unit, one or more control units disposed within rotor 4 and one or more control units disposed outside rotor 4 may be included.

[0108] The control unit 32 and sensors 34, 36, and 50 can be battery-powered by a battery disposed in the centrifugal separator rotor. Alternatively, electrical energy can be supplied to the control unit and sensors by a generator, rotary transformer, or slip ring disposed in the rotor.

[0109] Examples of data could be pressure measurements. Pressure sensors 34, 36, and 50 are configured to provide pressure measurements. Alternatively, one or more of sensors 34, 36, and 50 may provide measurements of other physical quantities, such as temperature. Such temperature measurements can be used when determining the density of one or more components of a liquid feed mixture. Alternatively, a separate temperature sensor (not shown) may provide temperature measurements to control unit 32.

[0110] Examples of data tables could be tables that map the location of the interface between, for example, the light phase and the heavy phase to different pressure differences between measurements from the first sensor 34 and the second sensor 36 or from the first sensor 34 and the third sensor 50, or data tables that map the density of the light phase and / or the heavy phase to temperature.

[0111] Figure 7 An embodiment of a method 100 for operating a centrifuge is illustrated. The centrifuge can be based on a combination of... Figures 1 to 4The centrifuge 2 in any of the discussed embodiments, and / or includes a rotor 4, the rotor 4 comprising, as in combination with Figures 5a to 6 The control system discussed is 30. References are also made below. Figures 1 to 6 .

[0112] Therefore, the rotor 4 is provided with a separation space 8, an inlet 10 leading into the separation space 8, a first pressure sensor 34 arranged at a first radial position in the separation space 8, and a second pressure sensor 36 arranged at a second radial position in the separation space 8.

[0113] Method 100 includes the following steps:

[0114] - Rotor 4, 102 rotations

[0115] - The liquid feed mixture is guided 104 to the separation space 8 via inlet 10.

[0116] - Immerse the first pressure sensor 34 and the second pressure sensor 36 in the process liquid.

[0117] -The first pressure is measured using the first pressure sensor 34.

[0118] -The second pressure of 110 is measured using the second pressure sensor 36, and

[0119] - Determine the parameters of the liquid in process 112 based on the first and second pressures.

[0120] As discussed above, parameters of the process liquid can be, for example, the pressure difference between measurements from the first pressure sensor 34 and the second pressure sensor 36, the radial position of the interface between the light and heavy phases, or the density of the heavy phase. Other physical quantities of the process liquid, such as temperature, can be used to determine parameters.

[0121] According to an embodiment, the parameter may be the pressure difference between the first pressure sensor 34 and the second pressure sensor 36.

[0122] According to an embodiment, the parameter may be the density of the process liquid.

[0123] According to an embodiment, the centrifugal separator 2 may include flow control components 38 and 40, and the method 100 may include the following steps:

[0124] - This parameter is used to control the flow control components 38 and 40 of flow control system 114. See above, especially the reference. Figures 1 to 4 .

[0125] According to an embodiment, the flow control component includes a heavy phase valve 38 disposed in the heavy phase outlet 14, and step 114 of controlling the flow control component may include the following steps:

[0126] - Control 116 phase valve 38. See above for further details, especially the reference. Figure 1 .

[0127] According to an embodiment, the flow control component includes a light phase valve 40 disposed in the light phase outlet 12, and step 114 of controlling the flow control component may include the following steps:

[0128] - Control 118 light phase valve 40. See above for further details, especially the reference. Figure 1 .

[0129] According to an embodiment, the centrifuge 2 includes a nozzle 42 disposed at the outer periphery of the rotor 4, and the flow control component includes a slidable bowl bottom 46 configured to open and close the nozzle 42. Step 114 of controlling the flow control component may include the following steps:

[0130] - Control the bottom 46 of the bowl to slide 120 to open and close the nozzle 42. See above for further details, especially the reference. Figure 3 and Figure 4 .

[0131] According to an embodiment, wherein the heavy phase outlet includes a nozzle 42, and step 120 of controlling the sliding bowl bottom 46 to open and close the nozzle 42 will cause the accumulated heavy phase to be ejected from the outer periphery of the separation space 8 when the nozzle 42 is open.

[0132] According to an embodiment, the centrifuge 2 includes a sludge outlet, which includes a nozzle 42. Step 120, which controls the sliding bowl bottom 46 to open and close the nozzle 42, will cause the accumulated sludge to be ejected from the outer periphery of the separation space 8 when the nozzle 42 is open.

[0133] According to an embodiment, the heavy phase outlet includes a nozzle 42 disposed at the outer periphery of the rotor 4, and the flow control component includes a mechanism 44 for changing the total opening area of ​​the nozzle 42. Step 114 of controlling the flow control component may include the following steps:

[0134] - Control mechanism 122 44 to change the total opening area. See above for further details, especially the reference. Figure 2 .

[0135] According to an embodiment, the centrifuge 2 includes a third pressure sensor 50 arranged at a third radial position in the separation space 8, wherein the third radial position is radially between the first radial position and the second radial position, and the method 100 may include the following steps:

[0136] -The third pressure is measured using the third pressure sensor 50, and

[0137] - Determine another parameter of the process fluid 112 based on at least one of the first and second pressures and the third pressure. See above for further details, especially the reference. Figure 5e .

[0138] According to one aspect, a computer program comprising instructions is provided, which, when executed by a computer, cause the computer to perform actions according to this document (particularly referenced). Figure 7 The methods 100 discussed and / or any of the embodiments are as follows. Those skilled in the art will understand that the method 100 for operating a centrifuge can be implemented by programming instructions. These programming instructions typically constitute a computer program that, when executed in a computer or control system, ensures that the computer or control system performs desired control, such as steps 102-124 according to the invention. The computer program is typically part of a computer program product, which includes a suitable digital storage medium on which the computer program is stored.

[0139] Figure 8 A computer-readable storage medium 90 according to an embodiment is illustrated. The computer-readable storage medium 90 includes instructions that, when executed by a computer or other control system 30, cause the computer or other control system 30 to perform method 100 according to any of the aspects and / or embodiments discussed herein. The computer-readable storage medium 90 may be provided, for example, in the form of a data carrier carrying computer program code that, when loaded into one or more control units 32 of the control system 30, is used to perform at least some of steps 102-124 according to some embodiments. The data carrier may be, for example, ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), hard disk, CD-ROM, memory stick, optical storage device, magnetic storage device, or any other suitable medium, such as a disk or tape that can store machine-readable data in a non-transitory manner. The computer-readable storage medium may further be provided as computer program code on a server and may be remotely downloaded to the control system 30, for example, via an Internet or intranet connection or via other wired or wireless communication systems.

[0140] It should be understood that the foregoing is a description of various exemplary embodiments, and the invention is defined only by the appended claims. Those skilled in the art will recognize that exemplary embodiments may be modified, and different features of exemplary embodiments may be combined to create embodiments other than those described herein, without departing from the scope of the invention as defined by the appended claims.

Claims

1. A centrifugal separation system (1) comprising a centrifugal separator (2) and a control system (30), said centrifugal separator (2) being configured to separate a liquid feed mixture into a light phase and a heavy phase, wherein the process liquid comprises one or more of a liquid feed mixture, a light phase, and a heavy phase, wherein the centrifugal separator comprises a rotor (4) configured to rotate about a vertical axis of rotation (6) and provided with a separation space (8), wherein The centrifuge (2) further includes an inlet (10) for introducing into the separation space (8), a light phase outlet (12) leading out of the separation space (8), a heavy phase outlet (14) leading out of the separation space (8), and a stack (16) of separation discs (18) arranged inside the separation space (8), wherein The control system (30) includes a control unit (32) and a first sensor (34) arranged at a first radial position in the separation space (8) for providing temperature measurement. Its features The control system (30) includes a second sensor (36) arranged at a second radial position in the separation space (8) for providing temperature measurement, wherein The first radial position is radially outside the second radial position, where The first sensor (34) and the second sensor (36) are positioned to be immersed in the process liquid during operation of the centrifuge (2), and wherein The control unit (32) is configured to determine the density of one or more components of the liquid feed mixture within the separation space (8) based on measurements from the first sensor (34) and the second sensor (36) during operation of the centrifuge (2).

2. The centrifugal separation system (1) according to claim 1, comprising flow control components (38, 40, 44, 46), wherein the control unit (32) is configured to control the flow control components (38, 40, 44, 46) based on the density.

3. The centrifugal separation system (1) according to claim 1 or 2, comprising a heavy phase valve (38) arranged in the heavy phase outlet (14), wherein the flow control component comprises the heavy phase valve (38).

4. The centrifugal separation system (1) according to claim 1 or 2, comprising a light phase valve (40) arranged in the light phase outlet (12), wherein the flow control component comprises the light phase valve (40).

5. The centrifugal separation system (1) according to claim 1 or 2, wherein the heavy phase outlet (14) includes a nozzle (42) arranged at the outer periphery of the rotor (4).

6. The centrifugal separation system (1) according to claim 1 or 2, comprising a sludge outlet, wherein the sludge outlet comprises a nozzle (42) disposed at the outer periphery of the rotor (4).

7. The centrifugal separation system (1) according to claim 6, wherein the flow control component includes a slidable bowl bottom (46) configured to open and close the nozzle (42).

8. The centrifugal separation system (1) according to claim 5, wherein the flow control component includes a mechanism (44) for changing the total opening area of ​​the nozzle (42).

9. The centrifugal separation system (1) according to claim 1 or 2, wherein the heavy phase outlet (14) includes at least one channel (48) extending within the rotor (4) from the radial outside of the separation space (8) toward the central portion of the rotor (4), and wherein the heavy phase outlet (14) is mechanically sealed between the rotor (4) and the fixed portion of the centrifugal separator (2).

10. The centrifugal separation system (1) according to claim 1 or 2, wherein the first sensor (34) is arranged radially outside the stack (16) of separation discs (18).

11. The centrifugal separation system (1) according to claim 1 or 2, wherein the second sensor (36) is arranged radially outside the stack (16) of separation discs (18).

12. The centrifugal separation system (1) according to claim 1 or 2, wherein the second sensor (36) is radially arranged within the stack (16) of separation discs (18) or radially inside the stack (16) of separation discs (18).

13. The centrifugal separation system (1) according to claim 1 or 2, comprising a third sensor (50) arranged at a third radial position in the separation space (8), wherein the third radial position is radially between the first radial position and the second radial position.

14. A method (100) of operating a centrifugal separator (2), said centrifugal separator (2) being configured to separate a liquid feed mixture into a light phase and a heavy phase, wherein the process liquid comprises one or more of the liquid feed mixture, the light phase, and the heavy phase, wherein The centrifuge (2) includes a rotor (4) configured to rotate about a vertical axis of rotation (6), and is provided with a separation space (8), an inlet (10) leading into the separation space (8), a light phase outlet (12) leading out of the separation space (8), a heavy phase outlet (14) leading out of the separation space (8), a stack (16) of separation discs (18) arranged inside the separation space (8), a first sensor (34) arranged at a first radial position in the separation space (8) for providing temperature measurement, and a second sensor (36) arranged at a second radial position in the separation space (8) for providing temperature measurement. The first radial position is radially outside the second radial position, and wherein The method (100) includes the following steps: - Rotate (102) rotor (4), -The liquid feed mixture is guided (104) into the separation space (8) via the inlet (10). - Immerse (106) the first sensor (34) and the second sensor (36) in the process liquid. -The first temperature is measured (108) using the first sensor (34). -The second temperature is measured (110) using the second sensor (36), and - Determine the density of one or more components of the liquid feed mixture based on the first temperature and the second temperature.

15. The method (100) of claim 14, wherein the centrifugal separator (2) includes a flow control component, and wherein the method (100) includes the following steps: -Based on the density control (114) flow control component.

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