EP3060352A1 - Procédé de clarification d'un produit fluide au moyen d'une centrifugeuse - Google Patents

Procédé de clarification d'un produit fluide au moyen d'une centrifugeuse

Info

Publication number
EP3060352A1
EP3060352A1 EP14792429.4A EP14792429A EP3060352A1 EP 3060352 A1 EP3060352 A1 EP 3060352A1 EP 14792429 A EP14792429 A EP 14792429A EP 3060352 A1 EP3060352 A1 EP 3060352A1
Authority
EP
European Patent Office
Prior art keywords
time interval
product
discharge
product parameter
drum
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
EP14792429.4A
Other languages
German (de)
English (en)
Other versions
EP3060352B1 (fr
Inventor
Wilfried Mackel
Markus Fleuter
Josef LINCKAMP
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.)
GEA Mechanical Equipment GmbH
Original Assignee
GEA Mechanical Equipment 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
Application filed by GEA Mechanical Equipment GmbH filed Critical GEA Mechanical Equipment GmbH
Publication of EP3060352A1 publication Critical patent/EP3060352A1/fr
Application granted granted Critical
Publication of EP3060352B1 publication Critical patent/EP3060352B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge
    • 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

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • a method which advantageously allows control of a continuously emptying Klärseparators with a drum.
  • a product parameter - in this case the degree of turbidity of a clear phase running out of the drum - is determined and used to monitor the emptying of the solids space of the drum.
  • the solid phase is continuously emptied. If the turbidity or turbidity level in the clear phase becomes too high, the clear phase is returned to the drum.
  • a clarifier for the clarification of liquids, in particular beverages, in which the solids are discharged discontinuously by means of a piston valve for opening and closing discharge openings when the turbidity measured with the photocell exceeds a certain limit.
  • the invention has the object to reduce this problem.
  • the invention solves this problem by a method having the features of claim 1. It also provides the alternative method of claim 7.
  • the invention according to the subject matter of claim 1 provides a method for clarifying a flowable starting product (AP) with a - self-emptying - separator with a rotatable drum with an inlet and at least one Flusstechniksaustrag for continuous discharge of at least one clarified liquid phase - a clear phase - and with discontinuously discharging solids discharge openings for the discontinuous discharge of the solid phase, characterized by the following steps: a. Setting or determining a start time; b. repeatedly determining at least one actual value of a product parameter of the clear phase (KP) derived from the drum; c.
  • KP clear phase
  • step a the start time or the beginning of the product feed into the drum. Otherwise, preferably the time of the last solids discharge is used.
  • the calibration period can also be determined indirectly from the time of solids discharge or as a period between two solid discharges.
  • the further solids discharge of step d. is thus only the consequence of the deviation of the product parameter of the setpoint and time of this event dependent. Falling below a limit value may be a suitable method, in particular according to the measuring method of WO 2008/058340 A1, in which the turbidity is measured in a separate line to the outlet of the drum and / or in a bypass line or the like.
  • the determination of the actual value of the product parameter can be carried out, for example, by a quasi-continuous determination of measured values. However, it is also possible to determine only a few measured values at slightly longer intervals with a time delay. As a result, a measured curve can be determined from the measured values, which allows a statement about the change of the product parameter.
  • the triggering of the second solids discharge preferably ends the calibration interval.
  • the clear phase carried out in the calibration interval corresponds qualitatively to the clear phase according to the prior art, since a change in the parameter has already been used in a significant manner. Therefore, in itself during the calibration interval, no qualitative change compared to the prior art is achieved. However, this improvement is made possible by the fact that steps e) and f) can now be used to make other time specifications than are possible solely on the basis of the measurements, which will be explained in more detail below on the basis of examples.
  • the determination and adjustment of the operating time interval can be done by various mathematical operations.
  • a preset time interval can be subtracted from the determined calibration time interval. It is also possible to carry out an analysis of the measurement curve, that is to say the chronological course of the measured values, over the calibration time interval by the evaluation unit or the end user and to set the operating time interval as a function of this evaluation.
  • a factorization of the calibration interval is also possible, wherein the factor which is multiplied by the calibration time interval is preferably smaller than 1. After passing through the set operating interval, a solids discharge is triggered. This solids discharge is thus time-controlled and not triggered as a function of a measurement.
  • the product parameter is the turbidity content of a clear phase
  • an increase in the turbidity or degree of turbidity in the clear phase to a limit value is once used when determining the calibration time interval. accepted. Some further emptying are then time-controlled so that this limit is not even reached and preferably even falls well below. In this way, the haze content of the overall derived clear phase is reduced and the quality of the derived clear phase as a whole is improved.
  • the product parameter of the clear phase may be not only the turbidity level but also another measurable parameter such as viscosity and / or conductivity. Sensors or measuring devices with correspondingly designed sensors for determining these parameters can be attached comparatively easily to the separator at the corresponding sequences.
  • the operating time interval is selected such that, within the operating time interval, the product parameter of the clear phase immediately before emptying deviates by less than 50%, preferably less than 20%, from the product parameter of the clear phase immediately after the solids discharge. If, for example, one chooses the degree of turbidity as a parameter, so far - as could i.a. 2-only a solids discharge or a solids discharge take place when the degree of turbidity of the clear phase towards the end of the time interval in which the solid collected in the separator had reached a multiple of the turbidity level of the clear phase immediately after emptying. This excessive increase in the turbidity level of the clear phase shortly before emptying is prevented by the new setting of the operating interval.
  • the operating time interval is at least 5%, preferably at least 10% smaller than the calibration time interval.
  • the solids discharge takes place, as usual in the case of a discontinuous solids discharge, preferably through discharge openings in the manner of nozzles, which can be closed and opened by a piston valve.
  • This has special advantage that the opening state of the discharge nozzles is precisely controlled.
  • the determination of the calibration time interval and of the operating interval and the setting of the operating time interval preferably takes place by means of an evaluation unit designed as a software routine of a control computer, which is connected to the sensors and which enables a control of the actuating mechanism of the piston valve in the drum.
  • the subject matter of claim 7 further provides a method for clarifying a flowable starting product (AP) with a centrifuge, in particular a separator with a rotatable drum with an inlet and at least one liquid discharge for the continuous discharge of at least one clarified liquid phase - a clear phase - and discontinuous to opening solids discharge openings for the discontinuous discharge of the solid phase, which comprises at least the following steps: a) preferably setting or determining a start time; b) repeatedly determining / measuring at least one actual value of a product parameter of the clear phase (KP) derived from the drum; c) determining and evaluating the difference quotient from the specific product parameters and the respective time intervals between the measurements; and d) triggering a solids discharge as a result of the evaluation in step c).
  • a flowable starting product AP
  • a centrifuge in particular a separator with a rotatable drum with an inlet and at least one liquid discharge for the continuous discharge of at least one clarified liquid phase
  • steps a) to d) preferably start anew.
  • the product parameter increase in particular the increase in turbidity, is not directly detected but the difference quotient from the measured values of the product parameter and the time intervals between the measurements determined and evaluated.
  • an evacuation may be triggered. Only when the behavior of this difference quotient (ie the course of the numerical differentiation of the measured values, which are only discrete in form knew product parameter function as a function of time) deviates from a predetermined and pre-stored behavior, ie in particular when the difference quotient (or the first derivative), for example, reaches or falls below or exceeds a predetermined limit once or several times, the emptying is triggered. According to claim 1 then the steps e) and f) are passed through, ie one or more further emptying intervals are defined in time. However, according to claim 7, it is also conceivable to go through steps a) to d) of this claim again.
  • the method of claim 7 also allows further statements. Thus, it may be that in the evaluation of the difference quotient it is found that this changes only very slightly over a relatively long period of time. This may be due to the following reason. With a very slow increase in the solids content in the separator drum, there is a risk that the disk pack in the separator drum will gradually fill up with solids. This is the reason for a proven continuous increase in turbidity or turbidity ("sawtooth effect") and dynamic limit over the course of a day, in which case it is conceivable that more solids are being discharged even though the solids content is not yet It is therefore advisable to carry out an emptying at an earlier point in time than it was meant to be in.
  • Fig. 1 a schematic sectional view of a separator, which is operated by the method according to the invention
  • FIG. 3 shows a flow chart for a method according to the invention with the steps of claim 1;
  • FIG. 4 shows an exemplary measurement curve from an application of a further method according to the invention
  • 5 shows a flow chart for an alternative method of FIG. 4 with the steps of claim 4.
  • the separator 1 shows a separator 1 for clarifying turbid-containing, flowable starting products AP with a drum with a vertical axis of rotation.
  • the processing of the product takes place in continuous operation. That is, the product feed takes place continuously and also the derivation of at least one clarified liquid phase, called clear phase.
  • the separator has a discontinuous solids discharge, wherein the separated from a starting product by clarification solid F is removed at intervals by the opening and reclosing of discharge nozzles or discharge openings 5.
  • the drum has a drum base 10 and a drum cover 1 1. It is also preferably surrounded by a hood 12.
  • the drum is also placed on a drive spindle 2, which is rotatably mounted and driven by a motor.
  • the drum has a product feed 4, through which a starting product AP is fed into the drum. It also has at least one outlet 13 with a gripper, which serves for discharging a clear phase KP from the drum.
  • the gripper is a kind of centripetal pump.
  • the liquid discharge could also be done by other means.
  • the rotatable drum with a vertical axis of rotation preferably has a disk pack 14 of axially spaced separating discs. Between the outer periphery of the plate package 14 and the inner circumference of the drum in the region of its largest inner diameter, a solid sam mel rough m 8 is formed. Solids which are separated from the clear phase in the region of the plate package 14 accumulate in the solid sam mel rough m 8, from which the solids via the discharge nozzles. 5 can be discharged from the drum.
  • the discharge nozzles 5 can be opened and closed by means of a piston slide 6, which is arranged in the drum base 11. When the discharge nozzles are open, the solid matter F is led out of the drum into a solids catcher 7.
  • the drum has an actuating mechanism.
  • this comprises at least one supply line 15 for a control fluid such as water and a valve assembly 16 in the drum and other elements outside the drum.
  • a control valve 17 arranged outside the drum, which is arranged in a feed line 19 for the control fluid arranged outside the drum, so that the control fluid can be sprayed into the drum for emptying by release of the control valve or conversely, the flow of control fluid may be interrupted to move the spool valve to release the discharge ports.
  • the actuating mechanism here the control valve 17 is connected via a data line 18 to a control unit 9 for controlling and / or regulating the solids discharge.
  • At least one sensor 22 which is designed to determine one or more product parameters of the at least one clear phase, is arranged on or in the course 13 of the clear phase.
  • Product parameters in the context of the present invention are, in particular, physical properties of the measuring medium "clear phase", such as turbidity, viscosity or also the conductivity (for example in the case of salt solutions.)
  • the at least one sensor 22 can be designed as a photocell for determining the light transmission.
  • a sensor 3 for determining the flow rate or one or more product parameters of the starting product to be fed into the drum is also preferably arranged.
  • These product parameters can also be physical parameters such as the turbidity or the viscosity of the starting product.
  • Such measuring methods can also be carried out by means of sensors as transmission measurements or scattered light measurements. Another way to determine the degree of turbidity are ultrasonic measurements. In contrast, also process parameters such as volume flow or
  • the senor may each be integrated into a measuring device which has a product parameter, e.g. determines the degree of turbidity or conductivity and at the same time a process parameter - such. determines the flow rate of the clear phase.
  • a product parameter e.g. determines the degree of turbidity or conductivity and at the same time a process parameter - such. determines the flow rate of the clear phase.
  • the sensors 3 and 22 are connected via data lines 20, 21 to the evaluation and control unit 9 (preferably a control computer of the separator), which evaluates the measured values determined and the movement of the piston valve 6 and thus also the time interval until the opening of the discharge nozzle - sen 5 controls.
  • the evaluation and control unit 9 preferably a control computer of the separator
  • the starting product AP is preferably continuously passed into the separator, where it is clarified. There is a continuous Klarphasenaustrag the clear phase KP. During the clarification of the starting product AP to form the clear phase KP contained in the starting material Trubstoffe and other solids in the solid sam mel m rough 6 of the separator collected, which fills. If too many of the solids are accumulated in the collecting space 6, their discharge begins with the clear phase ( Figure 2), which should be avoided if possible.
  • a limit value for the turbidity value which is not to be exceeded has been preset and a discharge of the solids F from the solid sam mel rough m 6 is carried out when the determined turbidity value exceeds the limit value.
  • a determination of the time interval from the last emptying of the solid space 6 of the separator 1 to a predetermined first turbidity limit value is carried out.
  • This method step is referred to below as the determination of a calibration time interval.
  • the calibration time interval is defined as the time between the last time emptying of the solids space of the separator until reaching the first turbidity limit value.
  • the solids space 6 is emptied.
  • the emptying of the solids space during this process step is controlled by the measurement and the attainment of the desired value.
  • an operating time interval is set.
  • the operating time interval can be determined by subtracting a predetermined time interval from the calibration time interval. After passing through the specific operating time interval, a solids discharge takes place in a time-controlled manner. As a result, an increase in the degree of turbidity is virtually pre-empted and ensured that the quality of the clear phase is almost consistently good. A measurement of the turbidity content during this process step is not absolutely necessary but conceivable in order to intervene if the limit is reached against expectation prematurely. After repeated, for example, n-fold successive passes of the operating time interval, each with subsequent emptying of the solid space 6, it may happen that the turbidity level of the clear phase increases again. In this case, n can preferably vary between 5-50, particularly preferably between 8-30, runs. Therefore, after an n-pass of operating time intervals, it is advisable to recalculate the calibration time interval and to readjust an operating time interval.
  • Fig. 2 illustrates the time course of the degree of turbidity T of the clear phase, if the previous method is used.
  • the turbidity or turbidity T is constant at one percent over the course of the first Minute to the 9th minute. From the 9th minute, the turbidity level increases relatively quickly. In the 1 1 .Minute the target value of 5% turbidity is reached and there is a solids discharge. As a result, the degree of turbidity in turn falls again to 1%.
  • the time window t (K) represents the calibration time interval.
  • the time interval can be set manually or determined mathematically or as a function of measured values in a database.
  • the operating time interval t (b) can be determined by multiplying the calibration time interval by a factor less than 1.
  • the time window t (B) represents the operating time interval. It can be seen that in this time window the turbidity is approximately constant at 1%.
  • step f) The sequence of steps a) to f) of claim 1 additionally illustrates FIG. 3. After step f), the method can again start at step a) and run through it again.
  • ⁇ : t2 - 11 between the respective measurements T2 (t2) and T1 (t1) determined and evaluated.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un procédé de clarification d'un produit de départ fluide (AP) au moyen d'une centrifugeuse, en particulier d'un séparateur comportant une entrée et au moins une sortie de liquide servant à évacuer en continu au moins une phase liquide clarifiée - phase claire - et des orifices de sortie de matières solides à ouverture discontinue servant à évacuer en discontinu la phase solide. Le procédé est caractérisé par les étapes suivantes consistant à : a. placer ou définir un instant de démarrage; b. déterminer de façon répétée au moins une valeur réelle d'un paramètre de produit de la phase claire dérivée du tambour (CP); c. déterminer la durée jusqu'à ce que la valeur réelle du paramètre de produit atteigne ou dépasse une valeur limite du paramètre de produit; d. déclencher de préférence une sortie de matières solides une fois que la valeur limite du paramètre de produit a été atteinte ou dépassée; e. déterminer et fixer une durée de fonctionnement t(B) à l'aide de la durée d'étalonnage déterminée t(K), la durée de fonctionnement t(B) étant inférieure ou supérieure à la durée d'étalonnage déterminée t(K); et f. déclencher au moins une ou plusieurs sorties de matières solides à chaque fois après l'expiration de la durée de fonctionnement fixée t(B).
EP14792429.4A 2013-10-21 2014-10-20 Procédé de clarification d'un produit fluide au moyen d'une centrifugeuse Active EP3060352B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310111576 DE102013111576A1 (de) 2013-10-21 2013-10-21 Verfahren zur Klärung eines fließfähigen Produktes mit einer Zentrifuge, insbesondere einem Separator
PCT/EP2014/072437 WO2015059091A1 (fr) 2013-10-21 2014-10-20 Procédé de clarification d'un produit fluide au moyen d'une centrifugeuse

Publications (2)

Publication Number Publication Date
EP3060352A1 true EP3060352A1 (fr) 2016-08-31
EP3060352B1 EP3060352B1 (fr) 2020-04-29

Family

ID=51844687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14792429.4A Active EP3060352B1 (fr) 2013-10-21 2014-10-20 Procédé de clarification d'un produit fluide au moyen d'une centrifugeuse

Country Status (8)

Country Link
US (1) US10040076B2 (fr)
EP (1) EP3060352B1 (fr)
CN (1) CN105658338A (fr)
AU (1) AU2014339090B2 (fr)
DE (1) DE102013111576A1 (fr)
NZ (1) NZ719985A (fr)
RU (1) RU2672412C2 (fr)
WO (1) WO2015059091A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849323B (zh) * 2015-05-06 2017-06-30 浙江大学 一种基于电子鼻快速检测果汁中澄清剂的方法
DE102015119165B4 (de) * 2015-11-06 2022-06-09 Gea Mechanical Equipment Gmbh Verfahren zur Klärung eines fließfähigen Produktes mit einer Zentrifuge, insbesondere einem Separator
DE102017106801B3 (de) * 2017-03-29 2018-08-02 Gea Mechanical Equipment Gmbh Selbstentleerender Separator zum schonenden Austrag von scherempfindlichen Produkten sowie Verfahren zu seinem Betrieb
DE102017111672B4 (de) * 2017-03-29 2019-05-16 Gea Mechanical Equipment Gmbh Verfahren zur automatisierten Feststoffentleerung von Zentrifugen
WO2021018537A1 (fr) * 2019-07-26 2021-02-04 Tetra Laval Holdings & Finance S.A. Réglage d'évacuation automatique
EP4108340B1 (fr) 2021-06-23 2025-06-11 Alfa Laval Corporate AB Procédé de fonctionnement d'un séparateur centrifuge

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Publication number Priority date Publication date Assignee Title
SE348121B (fr) 1970-12-07 1972-08-28 Alfa Laval Ab
DE3147613A1 (de) * 1981-12-02 1983-06-09 Klöckner-Humboldt-Deutz AG, 5000 Köln Zentrifuge mit selbsstaetiger feststoffentleerung
DE3228074A1 (de) 1982-07-28 1984-02-02 Westfalia Separator Ag, 4740 Oelde Verfahren und vorrichtung zur optimierung der geklaerten phase und der feststoffkonzentration bei einer zentrifuge mit kontinuierlichem feststoffaustrag
DE3620548A1 (de) * 1986-06-19 1987-12-23 Westfalia Separator Ag Verfahren und vorrichtung zur herstellung von zitrussaeften mit einer geringen restpuelpe
DE3940057A1 (de) * 1989-12-04 1991-06-06 Krauss Maffei Ag Verfahren und vorrichtung zum betrieb einer filterzentrifuge
US5318500A (en) * 1992-10-15 1994-06-07 Eli Lilly And Company Method for controlling intermittently discharged centrifuges
DE10335191B3 (de) * 2003-07-30 2005-05-19 Westfalia Separator Ag Verfahren und Vorrichtung zur Einstellung des Trubgehaltes eines Getränks
EP2091656A1 (fr) 2006-11-15 2009-08-26 Westfalia Separator Australia Pty.Ltd. Ensemble de centrifugeuse autonettoyante continue
DE202007009212U1 (de) * 2007-06-30 2008-12-11 Gea Westfalia Separator Gmbh Drei-Phasen-Trennseparator
DE102008051499A1 (de) 2008-10-13 2010-04-15 Gea Westfalia Separator Gmbh Verfahren zur Reduzierung des Pülpegehaltes von pülpehaltigen Fruchtsäften
DE102008062055B4 (de) * 2008-12-12 2021-07-22 Gea Mechanical Equipment Gmbh Verfahren zur Überwachung der automatisierten Entleerung einer Zentrifuge
DE102010038193A1 (de) * 2010-10-14 2012-04-19 Gea Mechanical Equipment Gmbh Verfahren zur Phasentrennung eines Produktes mit einer Zentrifuge
EP2644278B1 (fr) * 2012-03-27 2014-12-10 Alfa Laval Corporate AB Séparateur centrifuge et procédé de commande de décharge intermittente

Also Published As

Publication number Publication date
US20160263586A1 (en) 2016-09-15
EP3060352B1 (fr) 2020-04-29
AU2014339090A1 (en) 2016-04-07
RU2016116724A3 (fr) 2018-05-14
RU2672412C2 (ru) 2018-11-14
WO2015059091A1 (fr) 2015-04-30
CN105658338A (zh) 2016-06-08
AU2014339090B2 (en) 2018-10-11
NZ719985A (en) 2020-07-31
US10040076B2 (en) 2018-08-07
DE102013111576A1 (de) 2015-04-23
RU2016116724A (ru) 2017-11-28

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