WO2011093784A1 - System comprising centrifugal separator and method for controlling such a system - Google Patents
System comprising centrifugal separator and method for controlling such a system Download PDFInfo
- Publication number
- WO2011093784A1 WO2011093784A1 PCT/SE2011/050091 SE2011050091W WO2011093784A1 WO 2011093784 A1 WO2011093784 A1 WO 2011093784A1 SE 2011050091 W SE2011050091 W SE 2011050091W WO 2011093784 A1 WO2011093784 A1 WO 2011093784A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- controlling
- outlet channel
- control signal
- monitoring
- flow rate
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 230000003134 recirculating effect Effects 0.000 claims abstract description 5
- 239000010802 sludge Substances 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 description 27
- 238000001824 photoionisation detection Methods 0.000 description 15
- 230000001133 acceleration Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/02—Continuous feeding or discharging; Control arrangements therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
- B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
Definitions
- the present invention relates to a system comprising
- the separator comprises a rotor including a separation chamber, an inlet channel for a mixture of components to be separated,
- a first outlet channel for receiving at least one separated light component
- a second outlet channel for receiving at least one separated heavy component
- the system further comprising recirculation means for recirculating from said second outlet channel to said separation chamber part of the separated heavy component.
- the present invention relates to a method of controlling such a system comprising the following steps:
- Such systems are used when the content of the heavy component in a mixture varies heavily or is constantly low, whereas it is often desired to obtain a separated sludge with a constant concentration, to e.g. avoid clogging in heavy phase outlet pipes. It is an object of the present invention to provide an improved system comprising a hermetical centrifugal separator and a method of controlling such a system with which it is possible to control the heavy phase flow rate.
- a system comprising centrifugal separator as initially described hereinabove, wherein a first monitoring means is monitoring density, flow rate, or combination thereof, of the heavy component flowing in said second outlet channel, and
- a first control means is controlling recirculation flow in response to a control signal from said first monitoring means.
- the system comprises a second monitoring means monitoring flow rate of the heavy component flowing in said second outlet channel, and a second control means controlling the pressure by controlling a first back pressure valve in said first outlet channel in response to a control signal from said second monitoring means.
- the system comprises a third monitoring means monitoring pressure in said second outlet channel, and a third control means controlling the pressure by controlling a second back pressure valve in said second outlet channel in response to a control signal from said third monitoring means.
- control means are controlling in response to a signal based on a difference between a control signal from said monitoring means and a desired set point for a monitored parameter.
- the system comprises a fourth monitoring means monitoring flow rate in said recirculation means, and a fourth control means controlling recirculation flow rate in response to a control signal from said fourth monitoring means, where said fourth control means is getting its set point from the output of said first control means.
- said control means are PID controllers.
- said first control means is a MPC controller and said second, third and fourth control means are PID controllers, and where said first control means are supplying set points to at least one of said second, third and fourth control means.
- said second outlet channel is connected to heavy component outlet pipes inside the separation chamber where said pipes have inlet openings close to the interior wall of the separator bowl.
- the method comprises the following steps: monitoring a parameter of flow rate, of the heavy component flowing in said second outlet channel; creating a second control signal in relation to said parameter of flow rate; and controlling the pressure in said first outlet channel by controlling a first back pressure valve in said first outlet channel in response to said second control signal.
- the method comprises the following steps: monitoring a parameter of pressure in said second outlet channel; creating a third control signal in relation to said parameter of pressure; and controlling the pressure in said second outlet channel by controlling a second back pressure valve in said second outlet channel in response to said third control signal.
- the method said step of controlling comprises, computing of a difference between said control signal and a desired set point for a monitored parameter.
- the method comprises the steps of: monitoring a parameter of flow rate in said recirculation means; creating a fourth control signal in relation to said parameter of flow rate in said recirculation means; and controlling said recirculation flow rate in response to said fourth control signal, where said controlling is comprising computing of a difference between said fourth control signal and a set point which corresponds to the first control signal.
- the invention thus provides a system and method which control the characteristics of the separated heavy component even when feeding the separator with a feed of varying contents.
- the system and the method according to the invention are described below in a more detailed description of preferred embodiments of the present invention referring to the drawings FIGS. 1 -4.
- FIG. 1 is a flow chart of one embodiment of the system according to the present invention.
- FIG. 2 is a flow chart of a second embodiment of the system according to the present invention.
- FIG. 3 is a flow chart of a third embodiment of the system according to the present invention.
- FIG. 4 is a sectioned side view of the upper part of a separator bowl according to an embodiment of the invention.
- FIG 1 is a centrifugal system disclosed, comprising a hermetic centrifugal separator 1 , which is fed with a mixture of components to be separated through an inlet channel 2 by feeding pump 3.
- a liquid mixture of components centrifuged in a rotor with a separation chamber in which the components are separated.
- each outlet channel 4 5 is a (first and second resp.) back pressure valve 6, 7 arranged.
- a recirculation means 8 Leading from said second outlet channel 5 for heavy components to said inlet channel 2 is a recirculation means 8 arranged.
- Said recirculation means 8 comprises a recirculation channel 9 adapted to deviate part of the separated heavy component upstreams of said second back pressure valve 7 and a recirculation pump 10 adapted to pump said part of the separated heavy component to said inlet channel 2.
- the pumping flow of the recirculation pump 10 is controlled by a so called PID controller (Proportional-lntegral-Derivative) 1 1 which responds continually or intermittently to a signal from a coriolis flow meter 12 located in said outlet channel 5 for heavy components. Said signal derives from a calculated difference between a measured flow or density and a desired set point. It is for instance highly desirable that the outlet channel 5 is not subject to clogging as the continuous flow of heavy component is then interrupted. The desired set point may then be of a value that ascertains a continuing flow. Also the back pressure valves 6, 7 are provided with PID controllers 13, 14.
- the PID controller 13 controlling the back pressure valve 6 in the light component outlet channel 4 responds to a signal based on a difference between the heavy component flow in the outlet channel 5 and a desired set point of the same.
- the PID controller 1 1 is then responding to the density of the heavy component in the outlet channel 5.
- the PID controller 14 controlling the back pressure valve 7 in the heavy component outlet channel 5 is responding to the back pressure in said heavy component outlet channel 5.
- the idea is to control the recirculation flow to control the density while the light component valve 6 controls the heavy component pressure.
- This control strategy can be modified by adding a so called cascaded controller over the recirculation pump 10, as can be seen in fig. 2.
- cascade control there are two PIDs arranged with one PID controlling the set point of another.
- a PID controller acts as outer loop controller, which controls the primary physical parameter, such as fluid level or velocity.
- the other controller acts as inner loop controller, which reads the output of outer loop controller as set point, usually controlling a more rapid changing parameter, flow rate or acceleration.
- a PID controller 15 is arranged in an inner loop controlling the recirculation flow in response to a signal based on the recirculation flow after said pump 10, and in an outer loop a PID controller 16, getting its control signal from the monitored density in the heavy component output channel, provides PID controller 15 with a set point.
- a PID controller 17 controlling the heavy component back pressure valve 7 responds to a signal calculated from the heavy component flow monitored by the coriolis flow meter.
- a so called MPC controller 18 Model Predictive Controller
- MPC controller 18 Model Predictive Controller
- the parameters controlled by the PID-controllers are regulated according to graphs that optimize the process in reference to e.g. efficiency, quality of the output and/or clogging risk.
- the MPC controller 18 is then controlling the reference values of the underlying controllers, i.e. the PID- controllers, meaning that the manipulated variables of the MPC controller are the set points for the PID-controllers (e.g. flow rate, density or pressure).
- the MPC controller is the outer loop for all the PID-controllers.
- the PID-controllers are configured as in fig. 2 with the exception that the PID controller controlling the density in the heavy component outlet channel is deactivated.
- the MPC controller controls the density by setting reference values for the recirculation flow and the heavy component flow while the feed flow set point is held constant.
- Fig. 4 discloses an upper part of a separator bowl 19 which separator bowl defines a separation chamber 20.
- the heavy components of the separated mixture will due to the centrifugal forces collect in the area most remote from the rotational axis i.e. close to the interior wall of the separator bowl.
- the heavy components are discharged through ports in the periphery of the separator bowl 19 at certain intervals to prevent build up inside the separator.
- the heavy components are fed continuously from the separation chamber 20 out through a heavy component outlet channel 5 arranged on top of the separator bowl 19.
- the inside of the of the separator bowl 19 is therefore provided with heavy component outlet pipes 21 arranged on, in or close to the interior wall of said upper part of the separator bowl 19.
- the outlet pipes 21 follow the interior wall and extend upwards towards and connect to the heavy component outlet channel 5 and are thus leading the heavy components from the peripheral part of the separation chamber 20 radially inwards and upwards to said heavy component outlet channel 5.
- An application of the present invention discloses a system according to the present invention where the hermetic centrifugal separator is equipped with conventional ejection openings for optional intermittent discharge of sludge.
- the present invention is not limited by the described examples and several modifications and alternatives are possible within the scope of the present invention as defined by the claims.
Landscapes
- Centrifugal Separators (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180007414.1A CN102712002B (en) | 2010-01-29 | 2011-01-28 | Comprise the system of centrifugal separator and the method for controlling this type systematic |
BR112012017879A BR112012017879A2 (en) | 2010-01-29 | 2011-01-28 | system and method for controlling a system |
KR1020127019896A KR101467647B1 (en) | 2010-01-29 | 2011-01-28 | System comprising centrifugal separator and method for controlling such a system |
RU2012136776/05A RU2524967C2 (en) | 2010-01-29 | 2011-01-28 | System with centrifugal separator and method of control in such system |
US13/575,366 US9186687B2 (en) | 2010-01-29 | 2011-01-28 | Centrifugal separator with pressure or recirculation control or monitoring devices |
JP2012551130A JP5735006B2 (en) | 2010-01-29 | 2011-01-28 | System comprising centrifuge and method for controlling the system |
EP11737370.4A EP2528690B1 (en) | 2010-01-29 | 2011-01-28 | System comprising centrifugal separator and method for controlling such a system |
AU2011209989A AU2011209989B2 (en) | 2010-01-29 | 2011-01-28 | System comprising centrifugal separator and method for controlling such a system |
CA2786668A CA2786668C (en) | 2010-01-29 | 2011-01-28 | System comprising centrifugal separator and method for controlling such a system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1000085-9 | 2010-01-29 | ||
SE1000085A SE535959C2 (en) | 2010-01-29 | 2010-01-29 | Systems including centrifugal separator and method of checking the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011093784A1 true WO2011093784A1 (en) | 2011-08-04 |
Family
ID=44319585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2011/050091 WO2011093784A1 (en) | 2010-01-29 | 2011-01-28 | System comprising centrifugal separator and method for controlling such a system |
Country Status (11)
Country | Link |
---|---|
US (1) | US9186687B2 (en) |
EP (2) | EP3181232A1 (en) |
JP (1) | JP5735006B2 (en) |
KR (1) | KR101467647B1 (en) |
CN (1) | CN102712002B (en) |
AU (1) | AU2011209989B2 (en) |
BR (1) | BR112012017879A2 (en) |
CA (1) | CA2786668C (en) |
RU (1) | RU2524967C2 (en) |
SE (1) | SE535959C2 (en) |
WO (1) | WO2011093784A1 (en) |
Cited By (10)
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US20130029828A1 (en) * | 2010-01-29 | 2013-01-31 | Alfa Laval Corporate Ab | System comprising centrifugal separator and method for controlling such a system |
CN104507583A (en) * | 2012-07-02 | 2015-04-08 | Gea机械设备有限公司 | Method for reprocessing an emulsion formed during hydrometallurgical recovery of a metal |
WO2015059089A1 (en) * | 2013-10-21 | 2015-04-30 | Gea Mechanical Equipment Gmbh | Method for continuously clarifying a flowable suspension with a centrifuge |
CN105658082A (en) * | 2013-10-29 | 2016-06-08 | 阿尔法拉瓦尔股份有限公司 | Method for citrus fruit processing |
EP2864053B1 (en) | 2012-06-25 | 2019-08-21 | GEA Mechanical Equipment GmbH | Separator |
EP3666387A1 (en) | 2018-12-10 | 2020-06-17 | Alfa Laval Corporate AB | Method of controlling centrifugal separator and centrifugal separator |
EP3666390A1 (en) | 2018-12-10 | 2020-06-17 | Alfa Laval Corporate AB | Centrifugal separation system and method |
EP3698877A1 (en) | 2019-02-19 | 2020-08-26 | Alfa Laval Corporate AB | Method of controlling centrifugal separator and centrifugal separator |
EP3892380A1 (en) | 2020-04-08 | 2021-10-13 | Alfa Laval Corporate AB | A centrifugal separator, and a method of operating a centrifugal separator |
EP4268964A1 (en) * | 2022-04-29 | 2023-11-01 | Alfa Laval Corporate AB | A centrifugal separator |
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DE202007009212U1 (en) * | 2007-06-30 | 2008-12-11 | Gea Westfalia Separator Gmbh | Three-phase Trennseparator |
EP2366457B1 (en) * | 2010-03-19 | 2013-03-06 | Alfa Laval Corporate AB | Device and method for monitoring and adjusting the radial position of an interface layer in a centrifugal separator |
CN105363570A (en) * | 2015-12-15 | 2016-03-02 | 宜兴市华鼎粮食机械有限公司 | Three-phase disk centrifuge |
DE102018122808A1 (en) * | 2018-09-18 | 2020-03-19 | Voith Patent Gmbh | Control method of a cleaning device with heavy part separator |
KR102010873B1 (en) | 2019-04-11 | 2019-08-14 | (주)종합해사 | Orifice structure of decanter centrifuge |
ES2949565T3 (en) | 2019-08-19 | 2023-09-29 | Alfa Laval Corp Ab | Centrifugal separation system and operating method of a centrifugal separator |
EP3797872B1 (en) | 2019-09-25 | 2024-04-10 | Alfa Laval Corporate AB | Centrifugal separator and a method to control of the same |
KR102462338B1 (en) | 2020-08-13 | 2022-11-03 | 신흥정공(주) | System in which a plurality of centrifuges are selectively connected in series or parallel |
CN117396259A (en) * | 2021-06-02 | 2024-01-12 | 斯凯孚Mfr科技公司 | Method and system for oil purification |
EP4151298A1 (en) * | 2021-09-21 | 2023-03-22 | Alfa Laval Corporate AB | Separation of oil-containing aqueous liquid mixture |
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SE535959C2 (en) * | 2010-01-29 | 2013-03-05 | Alfa Laval Corp Ab | Systems including centrifugal separator and method of checking the same |
EP2644278B1 (en) * | 2012-03-27 | 2014-12-10 | Alfa Laval Corporate AB | Centrifugal separator and method of controlling intermittent discharge |
-
2010
- 2010-01-29 SE SE1000085A patent/SE535959C2/en not_active IP Right Cessation
-
2011
- 2011-01-28 AU AU2011209989A patent/AU2011209989B2/en not_active Ceased
- 2011-01-28 US US13/575,366 patent/US9186687B2/en active Active
- 2011-01-28 CA CA2786668A patent/CA2786668C/en not_active Expired - Fee Related
- 2011-01-28 RU RU2012136776/05A patent/RU2524967C2/en active
- 2011-01-28 KR KR1020127019896A patent/KR101467647B1/en active IP Right Grant
- 2011-01-28 BR BR112012017879A patent/BR112012017879A2/en active Search and Examination
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Also Published As
Publication number | Publication date |
---|---|
AU2011209989A1 (en) | 2012-08-16 |
EP2528690A4 (en) | 2016-08-24 |
SE535959C2 (en) | 2013-03-05 |
SE1000085A1 (en) | 2011-07-30 |
CA2786668A1 (en) | 2011-08-04 |
RU2012136776A (en) | 2014-03-10 |
US9186687B2 (en) | 2015-11-17 |
EP3181232A1 (en) | 2017-06-21 |
BR112012017879A2 (en) | 2016-03-29 |
EP2528690B1 (en) | 2018-05-30 |
CN102712002B (en) | 2015-08-05 |
CA2786668C (en) | 2015-09-22 |
AU2011209989B2 (en) | 2013-12-05 |
JP5735006B2 (en) | 2015-06-17 |
KR101467647B1 (en) | 2014-12-01 |
KR20120099294A (en) | 2012-09-07 |
RU2524967C2 (en) | 2014-08-10 |
JP2013517939A (en) | 2013-05-20 |
CN102712002A (en) | 2012-10-03 |
EP2528690A1 (en) | 2012-12-05 |
US20130029828A1 (en) | 2013-01-31 |
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