EP0348639A2 - Procédé et installation pour séparer les parties liquides et les parties granulaires fines d'une suspension de sucre - Google Patents

Procédé et installation pour séparer les parties liquides et les parties granulaires fines d'une suspension de sucre Download PDF

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Publication number
EP0348639A2
EP0348639A2 EP89108356A EP89108356A EP0348639A2 EP 0348639 A2 EP0348639 A2 EP 0348639A2 EP 89108356 A EP89108356 A EP 89108356A EP 89108356 A EP89108356 A EP 89108356A EP 0348639 A2 EP0348639 A2 EP 0348639A2
Authority
EP
European Patent Office
Prior art keywords
centrifuge
filter cake
measurement
washing
phase
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.)
Withdrawn
Application number
EP89108356A
Other languages
German (de)
English (en)
Other versions
EP0348639A3 (fr
Inventor
Gerhard Wilhelm Ing. Kappler
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.)
Laboratorium Prof Dr Rudolf Berthold GmbH and Co KG
Original Assignee
Laboratorium Prof Dr Rudolf Berthold GmbH and Co KG
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
Application filed by Laboratorium Prof Dr Rudolf Berthold GmbH and Co KG filed Critical Laboratorium Prof Dr Rudolf Berthold GmbH and Co KG
Publication of EP0348639A2 publication Critical patent/EP0348639A2/fr
Publication of EP0348639A3 publication Critical patent/EP0348639A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B30/00—Crystallisation; Crystallising apparatus; Separating crystals from mother liquors ; Evaporating or boiling sugar juice
    • C13B30/04—Separating crystals from mother liquor
    • C13B30/06—Separating crystals from mother liquor by centrifugal force
    • 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
    • B04B13/00—Control arrangements specially designed for centrifuges; Program control of centrifuges

Definitions

  • the invention initially relates to a method for separating liquid and fine-grain fractions from a sugar suspension, in which a certain filling quantity of the sugar suspension is spun in a centrifuge with the temporary addition of a certain amount of water and / or water vapor for a certain period of time.
  • Such a method is used in the sugar industry in particular to separate the liquid fraction from the sugar suspension (crystal suspension, "magma") obtained in the cooking apparatus. Centrifuges are used for this, the separation takes place in two phases:
  • the spinning process begins, whereby a sugar solution with a low degree of purity is separated ("green runoff"), in which all non-crystallizable substances such as ash components, cellulose etc. are contained. This "green run” is used for further processing in the stage with the next lowest degree of purity.
  • washing phase i.e. water (“water blanket”) is sprayed from the nozzles onto the filter cake deposited on the circumference of the centrifuge.
  • water blanket a water blanket
  • syrup residues still adhering to the sugar crystals are to be washed out and at the same time the fine-grain fractions contained are dissolved and also washed out. Otherwise, the fine-grained fractions could cause blockages later when the crystals are separated using sieves.
  • the liquid separated during this phase is called the "deck drain”.
  • the composition of the crystal suspension in particular with regard to the crystal sizes and there in particular the fine grain fractions, may be subject to strong fluctuations, no fixed values can be specified for the optimization of the spinning and washing process, which, as explained above, ensure that on the one hand the most complete washing possible is achieved, but on the other hand the process is not expanded unnecessarily, which leads to a deterioration in the overall result with regard to cycle duration and energy consumption. If the syrup fractions flow away rapidly in the green drain phase, one can conclude that the fine grain fraction is low and the amount of water in the wash phase can consequently also be kept relatively low.
  • control variables of the method in particular for specifying the filling quantities, the washing duration and the spin duration, are at least partially obtained from a temporary or continuous measurement of the surface density of the filter cake which settles on the periphery of the centrifuge during the spin operation.
  • the invention has recognized that the dynamic processes described above in the composition of the filter cake, which take place due to the addition of water on the one hand during the washing phase or through the exit of the green drain and the cover drain on the other hand, find their characteristic expression in the areal density of the filter cake.
  • the tracking of the areal density during the entire process in particular by means of a continuous measurement, thus provides a curve, the sections and slope values of which are characteristic of the respective "state" of the filter cake and thus of the separation of the substances concerned during the current measurement the green drain or the deck drain.
  • up-to-date information is available at any point in the process, which can be used directly to control the process: for example, the above-mentioned possibly rapid drainage of the syrup components in the green run-off phase causes a slight increase in the areal density curve, which can be used directly set the amount of water subsequently required in the washing phase to a low value.
  • a high proportion of fine grains and a low permeability of the filter cake leads to a smaller slope of the areal density curve during the washing phase, so that the amount of water might have to be increased during the mating phase, or the predetermined filling amount of the centrifuge would have to be reduced for the next cycle.
  • the area density can be measured radiometrically, that is to say by placing a radioactive radiation source on the outer periphery of the centrifuge, which radiates through the filter cake, the rays used, for example gamma radiation, being directed onto one inside the centrifuge or onto it the detector located on the opposite side of the centrifuge.
  • the absorption of this radiation is then a direct measure of the areal density of the filter cake, the areal density of the filter cake is thus directly represented by the counting rate given by the detector to a corresponding evaluation circuit.
  • This counting rate can be graphically represented "simultaneously" to the currently running process and enables the acquisition of the parameters that are critical for controlling the process.
  • This determination can optionally be automated by, for example, differentiating the curve shape for obtaining slope values by means of corresponding components in an evaluation circuit and, if necessary, comparing it with predetermined threshold values (obtained from calibration measurements), whereupon the corresponding control signals are sent to the corresponding components of the centrifuge, such as the engine for the centrifuge shaft or the pump for feeding the water nozzles.
  • the drum 10 of a centrifuge is rotatably mounted about a shaft 12 and is rotated by a motor (not shown).
  • the top of the drum is open so that the sugar suspension can be added here.
  • the filter cake 40 is pressed outwards against the jacket 11 of the drum, where it forms an annular filter cake of largely constant thickness.
  • a radioactive radiation source 20 for example a gamma emitter, is arranged on the outer jacket of the centrifuge, the rays of which pass through the filter cake 40 in the radial direction of the drum and hit an associated detector 21 inside the drum, which detector consequently measures the absorption of the filter cake 40.
  • the absorption of the filter cake 40 depends on the thickness of the filter cake and its respective components during the spinning or washing phase, the counting rate of the detector 21 is consequently a direct measure of the areal density of the filter cake 40.
  • control signals S1 and S2 are obtained, for example, by means of threshold values or limit values obtained on the basis of calibration or calibration measurements or stored curve profiles, which control the motor of the shaft 12 or the ( Control pump (not shown) for the washing water supply to the centrifuge.
  • the special structure of the evaluation circuit 30 can be carried out using known means, as can the special structure of the centrifuge 10 outlined, so that this is not dealt with in more detail.
  • the (qualitative) representation shows the area density F over time t.
  • time t 0, with a rotating centrifuge, the drum is filled with crystal suspension, which is deposited on the circumference of the drum with increasing thickness, and at the same time green drainage flows through the permeable jacket 11 of the drum; in the "net result", however, the filling of the crystal suspension predominates, so that the curve rises more or less steeply in the first spin phase A (green runoff).
  • the dimension .DELTA.F / .DELTA.t slope of the curve) depends on the behavior of the filter cake 40 and the filling process during the green drainage phase A and can be used, for example, to control the degree of filling or to determine the length of the subsequent washing phase B.
  • the filling process is finished and the washing phase B begins.
  • the washing out of the syrup residues and the fine-grain fractions leads to a reduction in the areal density F, here too the (negative) slope ⁇ F / ⁇ t is a measure of the sap of the syrup fractions and thus the fine-grain fraction and can also be used for control purposes, for example to determine the end time ⁇ ( ⁇ F / ⁇ t ⁇ 0) of wash phase B.
  • control B f ( ⁇ F / ⁇ t), depending on the storable values of the slope of the curve in the green drainage phase A, one can therefore have an optimal duration ( ⁇ -T1) Specify wash phase B.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Centrifugal Separators (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP19890108356 1988-07-01 1989-05-10 Procédé et installation pour séparer les parties liquides et les parties granulaires fines d'une suspension de sucre Withdrawn EP0348639A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3822225A DE3822225C1 (fr) 1988-07-01 1988-07-01
DE3822225 1988-07-01

Publications (2)

Publication Number Publication Date
EP0348639A2 true EP0348639A2 (fr) 1990-01-03
EP0348639A3 EP0348639A3 (fr) 1991-01-23

Family

ID=6357711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890108356 Withdrawn EP0348639A3 (fr) 1988-07-01 1989-05-10 Procédé et installation pour séparer les parties liquides et les parties granulaires fines d'une suspension de sucre

Country Status (3)

Country Link
US (1) US5104453A (fr)
EP (1) EP0348639A3 (fr)
DE (1) DE3822225C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019106842A1 (de) * 2019-03-18 2020-09-24 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren zum Regeln des Betriebes einer kontinuierlich oder periodisch arbeitenden Zentrifuge und Einrichtung zur Durchführung des Verfahrens

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2664830B2 (fr) * 1989-06-29 1993-08-13 Fives Cail Babcock Procede de conduite automatisee d'une essoreuse centrifuge a marche discontinue.
DE3940053A1 (de) * 1989-12-04 1991-06-06 Krauss Maffei Ag Verfahren und vorrichtung zum abziehen von fluessigkeiten aus einer zentrifuge
DE3940057A1 (de) * 1989-12-04 1991-06-06 Krauss Maffei Ag Verfahren und vorrichtung zum betrieb einer filterzentrifuge
FR2665379B1 (fr) * 1990-07-31 1993-08-13 Fives Cail Babcock Procede de conduite automatisee d'une essoreuse centrifuge a marche discontinue.
DE4414602A1 (de) * 1994-04-27 1995-11-02 Pfeifer & Langen Verfahren zur Steuerung des Nutzungsgrades einer diskontinuierlich arbeitenden Zentrifuge, insbesondere einer Zuckerzentrifuge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE945318C (de) * 1954-08-27 1956-07-05 Buckau Wolf Maschf R Anzeige- und Steuerungsvorrichtung fuer den Fuellungsgrad von Zentrifugen, insbesondere von Zuckerzentrifugen
JPS497539B1 (fr) * 1966-04-13 1974-02-21
DE2647554C3 (de) * 1976-10-21 1980-06-19 Bergwerksverband Gmbh, 4300 Essen Verfahren zur Behandlung von Steinkohlenschlammen
FR2377231A1 (fr) * 1977-01-13 1978-08-11 Fives Cail Babcock Installation d'essorage centrifuge continu notamment pour sucres destines au raffinage
DE3515915C2 (de) * 1985-05-03 1993-10-14 Braunschweigische Masch Bau Überwachungsverfahren und Vorrichtung zur Kontrolle des Sirupablaufes bei periodisch arbeitenden Zuckerzentrifugen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019106842A1 (de) * 2019-03-18 2020-09-24 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren zum Regeln des Betriebes einer kontinuierlich oder periodisch arbeitenden Zentrifuge und Einrichtung zur Durchführung des Verfahrens
EP3722004A1 (fr) 2019-03-18 2020-10-14 BMA Braunschweigische Maschinenbauanstalt AG Procédé de régulation du fonctionnement d'une centrifugeuse fonctionnant en continu ou périodiquement et dispositif de mise en uvre dudit procédé
US11697854B2 (en) 2019-03-18 2023-07-11 Bma Braunschweigische Maschinenbauanstalt Ag Method for controlling the operation of a continuously or periodically operating centrifuge and device for conducting the method

Also Published As

Publication number Publication date
DE3822225C1 (fr) 1989-07-20
US5104453A (en) 1992-04-14
EP0348639A3 (fr) 1991-01-23

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