EP0406095B1 - Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue - Google Patents

Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue Download PDF

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Publication number
EP0406095B1
EP0406095B1 EP90401815A EP90401815A EP0406095B1 EP 0406095 B1 EP0406095 B1 EP 0406095B1 EP 90401815 A EP90401815 A EP 90401815A EP 90401815 A EP90401815 A EP 90401815A EP 0406095 B1 EP0406095 B1 EP 0406095B1
Authority
EP
European Patent Office
Prior art keywords
basket
cycle
duration
washing
product
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.)
Expired - Lifetime
Application number
EP90401815A
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German (de)
English (en)
French (fr)
Other versions
EP0406095A1 (fr
Inventor
Gérard Journet
Nicolas Francou
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.)
F C B
Original Assignee
F C B
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Filing date
Publication date
Application filed by F C B filed Critical F C B
Publication of EP0406095A1 publication Critical patent/EP0406095A1/fr
Application granted granted Critical
Publication of EP0406095B1 publication Critical patent/EP0406095B1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to centrifugal dryers with a cylindrical basket operating in repetitive cycles during which the product to be spun is loaded into the basket, the loading being controlled by a device which interrupts the feeding when the layer of product to be spun reaches a predetermined thickness. , then, after a first spin, the product is washed by a fluid sprayed by means of a ramp pierced with orifices or provided with spray nozzles and placed inside the basket and undergoes a final spin and, finally, the product washed and spun is unloaded from the basket and evacuated.
  • a wringer is used in particular in the sugar industry to separate sugar crystals from a baked mass.
  • the cycle of such a wringer is defined by a certain number of parameters: acceleration, deceleration, speed step, time delay, etc.
  • acceleration, deceleration, speed step, time delay, etc. are entered, individually, in the automatic control of the wringer, either by the production manager or by the operator, and are possibly adjusted empirically as a function of the observed results of the wringing.
  • the wringer operating with a constant load, its rate depends on the flow rate of the product to be wrung.
  • the duration of the wringer cycle is predetermined and constant, and the operation of the installation is adapted to the flow rate to be treated by varying the time interval between the end of a cycle and the start of a cycle.
  • Document US-A-2,790,553 describes a battery of centrifugal dryers operating in this way.
  • the object of the present invention is to optimize the spin by making the best use of the time available for each cycle.
  • the time available for the next cycle is calculated at the end of each cycle, the duration of the final spin phase of the next cycle is fixed, as a function of the time available for this cycle, so reducing the waiting time between two successive cycles to a minimum, and the quantity of washing fluid to be used during the following cycle is determined as a function of the duration of the final spin phase.
  • the invention therefore makes it possible to reduce the consumption of washing fluid and, consequently, to make appreciable savings, in particular when the liquid collected during washing has to be treated. thereafter to recover the entrained or dissolved products, as is the case in sugar factories.
  • the washing liquid is supplied at a constant rate, the duration of the washing phase of the following cycle will be determined at the end of each cycle.
  • the duration of the washing phase may be constant and the flow rate of the washing fluid will be modified so that the desired volume of washing fluid is used during this phase.
  • the cycle includes an acceleration phase AB, a loading phase BC at constant speed VC, an acceleration phase CE, a final spin phase EF, at constant speed VE, a deceleration phase FG and an unloading phase GH, at constant speed VD; before the final spin, the layer of product loaded in the basket is washed, starting at D.
  • Q can, for example, come from the production management system upstream of spinning or from a level measurement in a tank or a mixer feeding the extractors.
  • the duration TE tF - tE longer or shorter, respectively, of such that the total duration of the cycle is equal to TCD, the duration of the other phases of the cycle remaining constant.
  • a new value is fixed for the volume of washing liquid to be used during the next cycle.
  • the supply rate of the washing ramps 22 (FIG. 2) being kept constant, a new value for the duration of washing TL will be set to take account of the new value for the duration of the spinning stage.
  • TCD time since TCD is 10 seconds longer than the duration of the cycle which has just ended, we will increase TE by 10 seconds and we will decrease TL by 1 second. Conversely, if TCD is less than the duration of the last cycle, TE will be decreased and TL will be increased.
  • the law linking variations in TE and those in TL will be established on the basis of tests so that the quality of the product spun remains constant for all the values selected. We could, for example, adopt a linear relation.
  • Variations in TE and TL are limited to predetermined maximum and minimum values.
  • a layer sensor 12 is used placed inside the basket. As soon as the loading of the basket has started, the probe is applied to the layer of product 14 to measure its thickness continuously. When the latter reaches a set value, a controller 24 triggers the closure of the valve 16 placed on the feed chute 18 of the wringer.
  • the basket load is maintained at each cycle at a maximum value, which is determined by the construction characteristics of the wringer, because the productivity of the wringer is then maximum.
  • the quantities of liquid used to wash, at each cycle, the feed chute, the basket and the wringer tank and for prewashing the layer of product loaded in the basket are constant, regardless of the load of the basket , and it is therefore advantageous, for a given flow rate of product to be wrung, to increase the basket load as much as possible, to reduce the number of cycles and, consequently, the consumption of washing liquid.
  • the curve giving the variations as a function of time, during a cycle, of the thickness of the layer of the product in the basket, which is represented in dashes in FIG. 1, is plotted at each cycle from the information of the probe 12 or a gammadensimeter 20 whose radiation passes through the layer of products 14.
  • All the calculations are carried out automatically by a computer 26 which receives the necessary information from appropriate sensors, and the calculated set values are applied to the inputs of the automatic device 24 which controls the various organs of the wringer: drive motor in rotation basket, feed valve, feeler, etc.

Landscapes

  • Centrifugal Separators (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Sewing Machines And Sewing (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
EP90401815A 1989-06-29 1990-06-26 Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue Expired - Lifetime EP0406095B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR898908714A FR2649909B1 (enrdf_load_stackoverflow) 1989-06-29 1989-06-29
FR8908714 1989-06-29

Publications (2)

Publication Number Publication Date
EP0406095A1 EP0406095A1 (fr) 1991-01-02
EP0406095B1 true EP0406095B1 (fr) 1993-12-08

Family

ID=9383276

Family Applications (2)

Application Number Title Priority Date Filing Date
EP90401815A Expired - Lifetime EP0406095B1 (fr) 1989-06-29 1990-06-26 Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue
EP90401814A Expired - Lifetime EP0406094B1 (fr) 1989-06-29 1990-06-26 Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90401814A Expired - Lifetime EP0406094B1 (fr) 1989-06-29 1990-06-26 Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue

Country Status (5)

Country Link
US (2) US5044092A (enrdf_load_stackoverflow)
EP (2) EP0406095B1 (enrdf_load_stackoverflow)
DE (2) DE69001400T2 (enrdf_load_stackoverflow)
ES (2) ES2041157T3 (enrdf_load_stackoverflow)
FR (1) FR2649909B1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1254625B (it) * 1991-11-19 1995-09-28 Dispositivo e procedimento per il trattamento di acque fangose e di scarico.
US5485066A (en) * 1994-04-15 1996-01-16 Savannah Foods And Industries Variable speed centrifugal drive control for sugar refining machines and the like
DE4414602A1 (de) * 1994-04-27 1995-11-02 Pfeifer & Langen Verfahren zur Steuerung des Nutzungsgrades einer diskontinuierlich arbeitenden Zentrifuge, insbesondere einer Zuckerzentrifuge
US6296774B1 (en) * 1999-01-29 2001-10-02 The Western States Machine Company Centrifuge load control for automatic infeed gate adjustment
US7958650B2 (en) * 2006-01-23 2011-06-14 Turatti S.R.L. Apparatus for drying foodstuffs
ATE533561T1 (de) * 2009-07-16 2011-12-15 Bws Technologie Gmbh Diskontinuierliche zentrifuge mit einer füllgutmengensteuerung und ein verfahren zum betreiben der zentrifuge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1652680A (en) * 1926-06-14 1927-12-13 William F Clegg Method of and means for treating sacchariferous solutions
US2682488A (en) * 1949-07-18 1954-06-29 Ernest G Kochli Method of centrifugal purification of sugar
US2790553A (en) * 1955-06-20 1957-04-30 Western States Machine Co Centrifugal battery control system

Also Published As

Publication number Publication date
DE69005044D1 (de) 1994-01-20
EP0406094B1 (fr) 1993-04-21
ES2047285T3 (es) 1994-02-16
US5115575A (en) 1992-05-26
EP0406095A1 (fr) 1991-01-02
FR2649909A1 (enrdf_load_stackoverflow) 1991-01-25
ES2041157T3 (es) 1993-11-01
EP0406094A1 (fr) 1991-01-02
DE69005044T2 (de) 1994-04-21
FR2649909B1 (enrdf_load_stackoverflow) 1993-05-21
US5044092A (en) 1991-09-03
DE69001400D1 (de) 1993-05-27
DE69001400T2 (de) 1993-11-11

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