EP0406094B1 - 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
EP0406094B1
EP0406094B1 EP90401814A EP90401814A EP0406094B1 EP 0406094 B1 EP0406094 B1 EP 0406094B1 EP 90401814 A EP90401814 A EP 90401814A EP 90401814 A EP90401814 A EP 90401814A EP 0406094 B1 EP0406094 B1 EP 0406094B1
Authority
EP
European Patent Office
Prior art keywords
basket
value
thickness
cycle
layer
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
EP90401814A
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German (de)
English (en)
French (fr)
Other versions
EP0406094A1 (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
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F C B
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Filing date
Publication date
Application filed by F C B filed Critical F C B
Publication of EP0406094A1 publication Critical patent/EP0406094A1/fr
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Publication of EP0406094B1 publication Critical patent/EP0406094B1/fr
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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 wring out the sugar crystals of a cooked 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.
  • certain parameters such as the time available for the cycle and the volume of the washing fluid to be used, depend on the load of the basket. As it is difficult to measure this load, we try to keep it constant and equal to a predetermined optimal value. For this, a feeler is used placed inside the basket and which controls the closing of the product supply valve to be wrung when the thickness of the layer of product in the basket reaches a predetermined set value. For various reasons, in particular because the product to be spun does not distribute itself uniformly over the entire height of the basket during loading, the thickness measured by means of the probe continues to increase for a certain time after the valve has closed. The maximum thickness reached is greater than the set value, and the difference between the two is variable depending on the characteristics of the product. For the same setpoint, we can therefore have different basket loads from one cycle to another.
  • 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.
  • a new value for the volume of washing liquid to be used during the next cycle is fixed.
  • the supply rate of the washing ramps 22 (FIG. 2) being constant, a new value for the duration of washing TL will be set.
  • a layer sensor 12 is used placed inside the basket.
  • the probe is applied to the product layer 14 to measure its thickness continuously. This increases rapidly until reaching an EPD setpoint value - trip thickness.
  • an automaton 24 closes the valve 16 placed on the feed chute 18 of the wringer. After closing the valve, the thickness of the layer 14 continues to increase, in particular due to the rise of the product from the bottom of the basket in the case of a vertical basket wringer such as that shown in FIG. 2 .
  • the maximum thickness of the EPM layer is therefore greater than EPD, and the difference between the two is variable depending on the characteristics of the product to be wrung, essentially its viscosity.
  • a new EPD value is determined at the end of each cycle by comparing the maximum value of the layer measured by means of the probe 12 with the theoretical value EPC corresponding to the load on the imposed basket Ch.
  • E EPC - EPM
  • An improvement consists in taking into account the evolution of the slope of the curve giving the variations in the thickness of the layer of the product in the basket.
  • This curve which is shown in dashed lines in FIG. 1, is drawn from information from the probe 12 or from a gammadensimeter 20 whose radiation passes through the layer of products 14.
  • This slope P is calculated at the start of loading and compared with the slope of the curve of the previous cycle. This calculation can be done, for example, from a measurement of the DTE time it takes to go from a thickness E1 to a thickness E2 during loading.
  • a computer 26 which receives the necessary information from the operator and from appropriate sensors, in particular from the probe 12 or from the gammadensimeter 20.
  • the calculated setpoint values are applied to the inputs of the controller 24 which controls the different parts of the wringer: basket drive motor, feed valve, feeler, etc.
  • the EPC setpoint corresponding to the imposed basket load Ch, is introduced into the computer 26 by the operator.
  • the computer uses the formula below to determine the EPD setpoint
  • K1 and K2 are coefficients introduced by the operator in the memory of the computer.
  • K1 could, for example, be chosen in a range from 0 to 2 and K2 in a range from 0 to 3.
  • EPD (n) is the set value used in cycle n and EPD (n + 1) is the calculated value for cycle n + 1 (next cycle).
  • a simplified solution consists in calculating EPD by the formula: and to take into account the evolution of the slope of the thickness curve as follows:
  • EPD is calculated by the above formula.

Landscapes

  • Centrifugal Separators (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Sewing Machines And Sewing (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
EP90401814A 1989-06-29 1990-06-26 Procédé de conduite automatisée d'une essoreuse centrifuge à marche discontinue Expired - Lifetime EP0406094B1 (fr)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0406094A1 EP0406094A1 (fr) 1991-01-02
EP0406094B1 true EP0406094B1 (fr) 1993-04-21

Family

ID=9383276

Family Applications (2)

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
EP90401815A Expired - Lifetime EP0406095B1 (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
EP90401815A Expired - Lifetime EP0406095B1 (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) EP0406094B1 (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
EP2277627B1 (de) * 2009-07-16 2011-11-16 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
DE69001400T2 (de) 1993-11-11
EP0406094A1 (fr) 1991-01-02
ES2047285T3 (es) 1994-02-16
US5044092A (en) 1991-09-03
DE69001400D1 (de) 1993-05-27
US5115575A (en) 1992-05-26
DE69005044D1 (de) 1994-01-20
EP0406095A1 (fr) 1991-01-02
DE69005044T2 (de) 1994-04-21
ES2041157T3 (es) 1993-11-01
FR2649909B1 (enrdf_load_stackoverflow) 1993-05-21
EP0406095B1 (fr) 1993-12-08
FR2649909A1 (enrdf_load_stackoverflow) 1991-01-25

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