EP2275207A1 - Centrifugeuse discontinue dotée d'un dispositif de commande de nettoyage et procédé de fonctionnement de la centrifugeuse - Google Patents

Centrifugeuse discontinue dotée d'un dispositif de commande de nettoyage et procédé de fonctionnement de la centrifugeuse Download PDF

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Publication number
EP2275207A1
EP2275207A1 EP09075317A EP09075317A EP2275207A1 EP 2275207 A1 EP2275207 A1 EP 2275207A1 EP 09075317 A EP09075317 A EP 09075317A EP 09075317 A EP09075317 A EP 09075317A EP 2275207 A1 EP2275207 A1 EP 2275207A1
Authority
EP
European Patent Office
Prior art keywords
centrifuge
filling material
washing
light
discontinuous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09075317A
Other languages
German (de)
English (en)
Other versions
EP2275207B1 (fr
Inventor
Viktor Janssen
Dominik Neuen
Michael Thelen
Reinhard Sonnenburg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BWS Technologie GmbH
Original Assignee
BWS Technologie GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP09075317A priority Critical patent/EP2275207B1/fr
Application filed by BWS Technologie GmbH filed Critical BWS Technologie GmbH
Priority to AT09075317T priority patent/ATE523257T1/de
Priority to RU2012104775/05A priority patent/RU2012104775A/ru
Priority to AU2010272557A priority patent/AU2010272557A1/en
Priority to UAA201201559A priority patent/UA105225C2/ru
Priority to CN201080031991XA priority patent/CN102481585A/zh
Priority to BR112012001034A priority patent/BR112012001034A2/pt
Priority to PCT/EP2010/060236 priority patent/WO2011006969A1/fr
Publication of EP2275207A1 publication Critical patent/EP2275207A1/fr
Application granted granted Critical
Publication of EP2275207B1 publication Critical patent/EP2275207B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • B04B11/043—Load indication with or without control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/12—Other accessories for centrifuges for drying or washing the separated solid particles

Definitions

  • the invention relates to a discontinuous centrifuge for solid-liquid separation of a crystal suspension and a method for controlling the operation of the discontinuous centrifuge with a washing control device.
  • a discontinuous centrifuge is known for solid-liquid separation of crystal suspensions in the production of food.
  • magmas are intermediates whose solid and liquid fractions are separated from the batch centrifuge in batches in successive steps.
  • the discontinuous centrifuge has a centrifuge drum which is filled at the beginning of each operation with the crystal suspension as a product, the centrifuge rotating at a speed of 100 to 250 revolutions per minute. After completing the filling of the centrifuge drum, which then contains a predetermined amount of the contents, the centrifuge drum is accelerated to a speed in the range of 980 to 1500 revolutions per minute. This speed is maintained until a desired drying progress is achieved in the medium.
  • the centrifuge drum is decelerated again and with a clearing device, the contents are removed from the centrifuge drum.
  • the operation is completed and a new batch of crystal suspension is filled in the centrifuge drum in a subsequent step, hurled and cleared.
  • the crystals of the crystal suspension are washed with a suitable washing medium, for example syrup, water or steam.
  • a suitable washing medium for example syrup, water or steam.
  • the washing is carried out by means of a constant washing liquid stream, the is sprayed on the free surface of the medium during a predetermined period of time.
  • the amount of washing liquid supplied to the centrifuge drum is constant for each batch and dissolves the same amount of crystals per working step.
  • the dissolved crystals are re-crystallized using energy in a subsequent step.
  • the discontinuous centrifuge for solid-liquid separation of the crystal suspension, the consistency of which, according to experience, is subject to certain fluctuations, with a corresponding adjustment of the washing time and the amount of washing liquid from batch to batch being desirable.
  • the adjustment of the washing time and the amount of washing liquid for each batch is conventionally carried out manually by operating personnel of the discontinuous centrifuge on the basis of empirical values.
  • the object of the invention is to provide a discontinuous centrifuge for solid-liquid separation of a crystal suspension and a method for controlling the operation of the discontinuous centrifuge, wherein the amount of washing liquid required for washing is minimal and thereby the process engineering and economically optimal separation is achieved.
  • the discontinuous centrifuge according to the invention for the solid-liquid separation of a crystal suspension has a centrifuge drum, in which the crystal suspension can be filled as a filling in a predetermined amount, and a spectrophotometer, which is set to determine the extinction of the contents during operation of the centrifuge, and a Washing control device, which is provided in real time, the instantaneous extinction of the contents of the spectrophotometer and which is adapted depending on the instantaneous extinction of the contents to determine a measure of the instantaneous drying progress of the medium, based on the current drying progress of the Browns a washing of the contents with the wash control device can be started at such a time that the amount of washing liquid required for washing is minimal.
  • the method according to the invention for controlling the operation of the discontinuous centrifuge comprises the steps of: a) providing the centrifuge with the centrifuge drum filled with the contents; b) operating the centrifuge drum in the spin mode; c) determining the extinction of the contents by determining an extinction coefficient representing the extinction; d) providing the extinction coefficient in real time; e) determining a measure of the instantaneous rate of drying of the product as a function of the extinction coefficient; f) starting the washing of the filling material at such a time based on the measure of the instantaneous drying progress of the filling material with the aid of the extinction coefficient that the amount of washing liquid required for washing is minimal.
  • the centrifuge can be operated safely, since the wash start time is set such that at the beginning of washing a sufficient penetration of the contents of the washing liquid is present and thereby a vibration critical operating condition of the centrifuge is prevented.
  • Preferred dimensions of the crystal suspension is a sugar crystal suspension and a criterion for starting the washing of the filling material is set to a color change to blue in light reflected at the surface of the filling material.
  • the spectrophotometer preferably has a light detector, with the light reflected on the surface of the filling material is detectable, which preferably has a wavelength of 420 nm to 560 nm, particularly preferably of 480 nm. In this case, it is preferred that the light detector has a photoresistor or a phototransistor or a photodiode as well as a red-green-blue color sensor.
  • the spectrophotometer preferably has a light source, with which the surface of the filling material can be irradiated, so that when the surface of the filling material is irradiated with the light emitted by the light source, light is reflected by the surface, which is detectable by the light detector the light emitted by the light source preferably has a wavelength of 420 to 560 nm, particularly preferably 480 nm.
  • the light source preferably has a light-emitting diode or a laser.
  • the washing control device is preferably arranged such that the start of the washing of the filling material with the wash control device can be triggered at the time at which a sudden increase of light in the wavelength range from 420 nm to 560 nm, preferably 480 nm, is detected by the light detector.
  • the spectrophotometer is preferably always arranged outside of the contents inside the centrifuge drum. Further, it is preferred that the spectrophotometer is at rest during operation of the centrifuge relative to the axis of rotation and to the rotational movement of the centrifuge drum or rotates with the centrifuge drum.
  • the spectrophotometer is preferably mounted on a longitudinal end of a rod which extends with the spectrophotometer parallel to the axis of rotation of the centrifuge drum into the interior of the centrifuge drum. Furthermore, the spectrophotometer is preferably made of glass-free material and / or at least up to 85 ° C operating temperature used.
  • the crystal suspension is preferably a sugar crystal suspension and the method has further preferred steps: setting a criterion for starting the washing of the contents of a color change to the blue when reflected light at the surface of the medium; Irradiating the surface of the filling material with light, whereby light is reflected from the surface which is detected and is white and / or blue, preferably has a wavelength of 420 nm to 560 nm, particularly preferably at 480 nm. It is preferred that the start of the washing of the filling material is triggered at the time at which a sudden increase of light in the wavelength range of 420 nm to 580 nm, preferably 480 nm, is detected. The duration of the washing is preferably determined as a function of the layer thickness of the filling material present at the starting time.
  • the discontinuous centrifuge is used for solid-liquid separation of the sugar crystal suspension, then the contents have a brownish color at the beginning of spinning, with light which is reflected on the surface of the medium having no or only a small amount of blue. If the contents are illuminated in this state with blue light, this light is almost completely absorbed by the contents and the brightness of the reflected light is low. As a result, appears with the light sensor, which detects the reflected light, the contents as dark.
  • the drying progress of the filling material increases, whereby upon reaching the determined drying progress in the filling material, a color change turns blue. As a result, from the time the color change occurred, the amount of blue in the reflected light has greatly increased.
  • the reflected, blue light detecting light sensor responds accordingly and recognizes the contents as bright.
  • the time of the color change of the medium depending on the Medgutkonsistenz be detected and tuned to the washing of the contents at such time are started, that the amount of washing liquid required for washing is minimal.
  • Characterized in that advantageous when the color change occurs, the washing of the contents is started, is adapted to the wash control device of the washing start time and the amount of washing liquid to the consistency of the contents. If the duration of the washing is made dependent on the thickness of the layer arranged in the centrifuge drum, as the filling material is present in the centrifuge drum, the amount of washing liquid is advantageously optimally adapted to the quantity of filling material. As a result, a uniform sugar quality in the solid-liquid separation of the sugar crystal suspension can be achieved at a predetermined target quality. Further, with detection of the color change in the centrifuge drum, drainage separation of green drain (i.e., syrup flow before color change) and white drain (syrup drain after color change) is more improved.
  • green drain i.e., syrup flow before color change
  • white drain sirup drain after color change
  • FIG. 1 a longitudinal section through the embodiment of the centrifuge.
  • a centrifuge 1 has a centrifuge drum 2.
  • the centrifuge drum 2 has an axis of rotation 3, which coincides with the axis of symmetry of the centrifuge drum 2 and in FIG. 1 is arranged vertically.
  • the centrifuge drum 2 further has a spindle 4, which serves for rotationally driving the centrifuge drum 2 and is fixedly connected to a hub 5 on which the centrifuge drum 2 is mounted.
  • a distributor 6 is arranged in the form of a radially outwardly projecting from the hub 5 conical surface.
  • the centrifuge drum 2 is further formed by a cylindrical wall 7 and a lid 8, with which the cylindrical wall 7 is covered.
  • filling material 9 is introduced, which in spin operation of the centrifuge 1 at spin speed of the centrifuge drum 2 equal to the cylindrical wall. 7 due to centrifugal forces.
  • a free surface 10 forms, which coincides with an imaginary cylinder symmetrical about the axis of rotation 3.
  • a light source 11 and a light detector 12 are arranged radially within the free surface 10 of the medium 9.
  • the light source 11 and the light detector 12 are arranged at the same radius at a distance from the rotation axis 3 and at a predetermined longitudinal distance parallel to the rotation axis 3. From the light source 11, a light beam 13 is emitted which impinges on a point 14 of the free surface 10 of the medium 9, is reflected back from there as a light beam 15 and reaches the light detector 12.
  • the longitudinal distance between the light source 11 and the light detector 12, the angle at which the light beam 13 hits the point 14, or the angle at which the light beam 15 is reflected by the point 14, are coordinated so that starting from the emitted light beam 13, the reflected light beam 15 strikes the light detector 12.
  • a stator 16 protruding inwardly into the centrifuge drum 2 is provided on the lid of the housing surrounding the centrifuging drum 2, to which the light source 11 and the light detector 12 are attached.
  • the sugar crystal suspension When centrifuging a sugar crystal suspension with the centrifuge 1, the sugar crystal suspension is introduced into the centrifuge drum 2. After completion of the filling, the centrifuge drum 2 is operated at spin speed, wherein the filling material is distributed evenly distributed to the cylindrical wall 7, wherein of the contents 9, the free surface 10 is formed.
  • the filling material 9 is dehydrated so that the drying progress in the filling material 9 increases steadily.
  • the contents 9 At the beginning of spinning the contents 9 has a brownish color. From the light source 11 of the emitted light beam 13 as blue light on the free Surface 10 blasted and reflected at the point 14 as the light beam 15.
  • the reflected light beam 15 at the beginning of the spin is very weak in its intensity, since no or almost no blue light is reflected by the surface 10.
  • the consistency of the filling material 9 changes to the effect that on reaching a certain dry matter content of the filling material 9, a color change takes place, wherein the brightness of the reflected beam 15 increases abruptly.
  • the intensity of the reflected light beam 15 is constantly measured by the light detector 12, so that the increase in brightness of the reflected light beam 15 occurring during color change is detected by the light detector 12.
  • a corresponding signal to a washing control device (not shown, arranged outside the centrifuge drum 2) is passed as a control signal, with a washing of the filling material (9) in the centrifuge drum 2 with a washing liquid is started.
  • a washing control device not shown, arranged outside the centrifuge drum 2
  • the light source 11 and the light detector 12 are set up such that the radial distance between the light source 11 or the light detector 12 and the surface 10 of the filling material 9 can be determined with you.
  • the thickness of the filling material 9 and its volume can be determined.
  • Adjusted to the volume of the filling material the amount of washing liquid used per batch is adjusted, wherein the duration of the washing liquid addition at a constant preset washing liquid volume flow, the amount of washing liquid can be adjusted. This ensures that the Starting time of the washing and the amount of washing liquid are optimally adjusted to the batch-to-batch changing consistency of the contents 9, whereby a sugar crystal yield is achieved with a desired target quality of the contents with consistently high quality of the discharged sugar product.

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  • Centrifugal Separators (AREA)
EP09075317A 2009-07-16 2009-07-16 Centrifugeuse discontinue dotée d'un dispositif de commande de nettoyage et procédé de fonctionnement de la centrifugeuse Not-in-force EP2275207B1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AT09075317T ATE523257T1 (de) 2009-07-16 2009-07-16 Diskontinuierliche zentrifuge mit einer waschsteuerungseinrichtung und ein verfahren zum betreiben der zentrifuge.
EP09075317A EP2275207B1 (fr) 2009-07-16 2009-07-16 Centrifugeuse discontinue dotée d'un dispositif de commande de nettoyage et procédé de fonctionnement de la centrifugeuse
AU2010272557A AU2010272557A1 (en) 2009-07-16 2010-07-15 Batchwise centrifuge with a wash control device and a process for operating the centrifuge
UAA201201559A UA105225C2 (ru) 2009-07-16 2010-07-15 Центрифуга периодического действия с устройством управления промыванием и способ управления указанной центрифугой
RU2012104775/05A RU2012104775A (ru) 2009-07-16 2010-07-15 Центрифуга периодического действия с устройством управления промыванием и способ управления указанной центрифугой
CN201080031991XA CN102481585A (zh) 2009-07-16 2010-07-15 具有冲洗控制装置的非连续离心机及操作该离心机的方法
BR112012001034A BR112012001034A2 (pt) 2009-07-16 2010-07-15 centrífuga descontínua com um dispositivo de controle de lavagem e método para a operação da centrífuga
PCT/EP2010/060236 WO2011006969A1 (fr) 2009-07-16 2010-07-15 Centrifugeuse discontinue comportant un dispositif de commande de lavage et procédé pour faire fonctionner la centrifugeuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09075317A EP2275207B1 (fr) 2009-07-16 2009-07-16 Centrifugeuse discontinue dotée d'un dispositif de commande de nettoyage et procédé de fonctionnement de la centrifugeuse

Publications (2)

Publication Number Publication Date
EP2275207A1 true EP2275207A1 (fr) 2011-01-19
EP2275207B1 EP2275207B1 (fr) 2011-09-07

Family

ID=41395071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09075317A Not-in-force EP2275207B1 (fr) 2009-07-16 2009-07-16 Centrifugeuse discontinue dotée d'un dispositif de commande de nettoyage et procédé de fonctionnement de la centrifugeuse

Country Status (8)

Country Link
EP (1) EP2275207B1 (fr)
CN (1) CN102481585A (fr)
AT (1) ATE523257T1 (fr)
AU (1) AU2010272557A1 (fr)
BR (1) BR112012001034A2 (fr)
RU (1) RU2012104775A (fr)
UA (1) UA105225C2 (fr)
WO (1) WO2011006969A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3085452A1 (fr) * 2015-04-21 2016-10-26 BWS Technologie GmbH Centrifugeuse discontinue doté d'un dispositif de commande destiné à commander le fonctionnement de la centrifugeuse et procédé de fonctionnement de la centrifugeuse
US10549288B2 (en) 2012-03-14 2020-02-04 Bma Braunschweigische Maschinenbauanstalt Ag Device having a discontinuously operating centrifuge for separating syrup from sugar massecuites and method for operating such a device
WO2020094217A1 (fr) * 2018-11-06 2020-05-14 Ferrum Ag Procédé de fonctionnement d'un dispositif de centrifugation
US11020753B2 (en) 2015-10-02 2021-06-01 Bjarne Christian Nielsen Holding Aps Apparatus and method for monitoring and controlling a centrifugal
FR3136240A1 (fr) 2022-06-07 2023-12-08 Iteca Socadei Centrifugeuse pour le contrôle et la mesure en continu de la couleur d’une masse cuite sur toute la hauteur du panier de centrifugation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9554286B2 (en) 2011-12-02 2017-01-24 Lear Corporation Apparatus and method for detecting a location of a wireless device
CN112851474B (zh) * 2020-12-28 2023-08-15 江苏先卓食品科技股份有限公司 一种离心工序饱和蒸汽代替水洗晶体方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3515915A1 (de) * 1985-05-03 1986-11-06 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Ueberwachungsverfahren und vorrichtung zur kontrolle des sirupablaufes bei periodisch arbeitenden zuckerzentrifugen
DE4412889A1 (de) * 1994-04-14 1995-10-19 Krauss Maffei Ag Anordnung zur Überwachung einer Fest-Flüssig-Trenneinrichtung
EP0679722A2 (fr) * 1994-04-27 1995-11-02 PFEIFER & LANGEN Procédé de contrôle de l'efficacité d'une centrifugeuse travaillant en discontinu, en particulier une centrifugeuse pour sucre
EP1475156A2 (fr) * 2003-05-07 2004-11-10 THOMAS BROADBENT & SONS LIMITED Commande de charge pour centrifuges

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3515915A1 (de) * 1985-05-03 1986-11-06 Braunschweigische Maschinenbauanstalt AG, 3300 Braunschweig Ueberwachungsverfahren und vorrichtung zur kontrolle des sirupablaufes bei periodisch arbeitenden zuckerzentrifugen
DE4412889A1 (de) * 1994-04-14 1995-10-19 Krauss Maffei Ag Anordnung zur Überwachung einer Fest-Flüssig-Trenneinrichtung
EP0679722A2 (fr) * 1994-04-27 1995-11-02 PFEIFER & LANGEN Procédé de contrôle de l'efficacité d'une centrifugeuse travaillant en discontinu, en particulier une centrifugeuse pour sucre
EP1475156A2 (fr) * 2003-05-07 2004-11-10 THOMAS BROADBENT & SONS LIMITED Commande de charge pour centrifuges

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10549288B2 (en) 2012-03-14 2020-02-04 Bma Braunschweigische Maschinenbauanstalt Ag Device having a discontinuously operating centrifuge for separating syrup from sugar massecuites and method for operating such a device
EP3085452A1 (fr) * 2015-04-21 2016-10-26 BWS Technologie GmbH Centrifugeuse discontinue doté d'un dispositif de commande destiné à commander le fonctionnement de la centrifugeuse et procédé de fonctionnement de la centrifugeuse
WO2016170047A1 (fr) * 2015-04-21 2016-10-27 Bws Technologie Gmbh Centrifugeuse discontinue munie d'un dispositif de commande permettant de commander le fonctionnement de la centrifugeuse, et procédé permettant de faire fonctionner la centrifugeuse
US11020753B2 (en) 2015-10-02 2021-06-01 Bjarne Christian Nielsen Holding Aps Apparatus and method for monitoring and controlling a centrifugal
WO2020094217A1 (fr) * 2018-11-06 2020-05-14 Ferrum Ag Procédé de fonctionnement d'un dispositif de centrifugation
FR3136240A1 (fr) 2022-06-07 2023-12-08 Iteca Socadei Centrifugeuse pour le contrôle et la mesure en continu de la couleur d’une masse cuite sur toute la hauteur du panier de centrifugation
WO2023237832A1 (fr) 2022-06-07 2023-12-14 Iteca Socadei Centrifugeuse pour le contrôle et la mesure en continu de la couleur d'une masse cuite sur toute la hauteur du panier de centrifugation

Also Published As

Publication number Publication date
BR112012001034A2 (pt) 2016-03-15
UA105225C2 (ru) 2014-04-25
EP2275207B1 (fr) 2011-09-07
ATE523257T1 (de) 2011-09-15
CN102481585A (zh) 2012-05-30
RU2012104775A (ru) 2013-08-27
WO2011006969A1 (fr) 2011-01-20
AU2010272557A1 (en) 2012-02-09

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