FR2609903A2 - Process for the production of a seed magma for a continuously operating crystallisation apparatus - Google Patents

Process for the production of a seed magma for a continuously operating crystallisation apparatus Download PDF

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Publication number
FR2609903A2
FR2609903A2 FR8700761A FR8700761A FR2609903A2 FR 2609903 A2 FR2609903 A2 FR 2609903A2 FR 8700761 A FR8700761 A FR 8700761A FR 8700761 A FR8700761 A FR 8700761A FR 2609903 A2 FR2609903 A2 FR 2609903A2
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France
Prior art keywords
magma
temperature
mass
cooked
flow rate
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
FR8700761A
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French (fr)
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FR2609903B2 (en
Inventor
Gerard Journet
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.)
Fives Cail Babcock SA
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Fives Cail Babcock SA
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 FR878700761A priority Critical patent/FR2609903B2/en
Application filed by Fives Cail Babcock SA filed Critical Fives Cail Babcock SA
Priority to EP87401616A priority patent/EP0255786B1/en
Priority to ES87401616T priority patent/ES2015589B3/en
Priority to AT87401616T priority patent/ATE54055T1/en
Priority to DE8787401616T priority patent/DE3763364D1/en
Priority to PL1987266837A priority patent/PL154185B1/en
Priority to AU75958/87A priority patent/AU591313B2/en
Publication of FR2609903A2 publication Critical patent/FR2609903A2/en
Application granted granted Critical
Publication of FR2609903B2 publication Critical patent/FR2609903B2/en
Priority to GR90400444T priority patent/GR3000634T3/en
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D9/00Crystallisation
    • B01D9/0018Evaporation of components of the mixture to be separated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D9/00Crystallisation
    • B01D9/0036Crystallisation on to a bed of product crystals; Seeding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D9/00Crystallisation
    • B01D9/005Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D9/00Crystallisation
    • B01D9/0059General arrangements of crystallisation plant, e.g. flow sheets

Abstract

Process for the production of a seed magma for a continuously operating crystallisation apparatus 10 according to the main patent. To make the control of the flow rate of the liquid employed for diluting the massecuite in 14 more reliable, this flow rate is controlled (by means of the controller 32) as a function of the temperature of the magma leaving the mill 16.

Description

Le brevet principal a pour objet un procédé de production d'un magma d'ensemencement pour un appareil de cristallisation à marche continue a partir d'une fraction de la masse-cuite produite par cet appareil consistant a diluer cette fraction de la masse-cuite pour réduire sa viscosité et a l'introduire dans un broyeur oh les cristaux qu'elle contient sont broyés au sein de la liqueur-mère et caractérisé en ce que ladite liqueur-mère est maintenue en état de legère sous-saturation pendant le broyage, pour assurer la refonte des très fins cristau:e produits. The main patent relates to a process for producing a seed magma for a continuous-running crystallization apparatus from a fraction of the mass-cooked produced by this apparatus consisting in diluting this fraction of the mass-cooked to reduce its viscosity and to introduce it into a grinder where the crystals which it contains are ground within the mother liquor and characterized in that said mother liquor is maintained in a state of slight undersaturation during grinding, to redesign very fine crystals: e products.

L'une des solutions proposées dans le brevet pour maintenir la liqueur-mère en état de sous-saturation consiste à régler le débit dL liquide de dilution, préalablement porte à une température adéquate. en fonction de la compacité de la masse-cuite diluée. La mesure de la compacité d'une masse cuite en Couement n 'est pas précise et la régulation basée sur cette mesure n'est pas fiable. One of the solutions proposed in the patent for keeping the mother liquor in a state of undersaturation consists in regulating the flow rate of dilution liquid, previously brought to an adequate temperature. depending on the compactness of the diluted massacotta. The measurement of the compactness of a terracotta in Couement is not precise and the regulation based on this measurement is not reliable.

La oresente invention propose une solution plus fiable de régulation du débit du liquide de dilution. Elle est basée sur l'observation pue l'échauffement produit par le broyage de la masse-cuite est fonction de sa teneur en cristaux, et de sa teneur en matières sèches. The oresente invention provides a more reliable solution for regulating the flow rate of the dilution liquid. It is based on the observation that the heating produced by the grinding of the cooked-mass is a function of its crystal content, and of its dry matter content.

Conformément à la présente invention, on règle le débit du liquide de dilution en fonction de la température du magma à la sortie du broyeur, La valeur de consigne à laquelle on maintient la température du magma à sa sortie du broyeur, en agissant sur le débit du liquide de dilution, est fonction du débit. de la température et de la teneur en eristaux de la masse-cuite avant dilution, du débit, du bri et de la température du liquide de dilution, et du tau de réduction des cristaux voulu Généralement le débit et la température de la masse-cuite sont constants et, en maintenant constante la température du liquide de dilution, la valeur de consigne de la température du magma sera constante pour un taux de réduction donné, Lorsque la conduite de l'appareil de cristallisation est automatisée cette valeur de consigne peut être déterminée périodiquement à partir des valeurs mesurées ou calculées des différents paramètres. In accordance with the present invention, the flow rate of the dilution liquid is adjusted as a function of the temperature of the magma at the outlet of the mill. The set value at which the temperature of the magma is maintained at its outlet from the mill, by acting on the flow rate. of the dilution liquid, is a function of the flow rate. the temperature and the eristal content of the mass-cooked before dilution, the flow rate, the bri and the temperature of the dilution liquid, and the reduction rate of crystals desired Generally the flow and the temperature of the mass-cooked are constant and, keeping the temperature of the dilution liquid constant, the set point of the magma temperature will be constant for a given reduction rate, When the operation of the crystallization apparatus is automated this set point can be determined periodically from the measured or calculated values of the different parameters.

Le descriptior qui Suit se réfère au dessin l'accompagnant du est le schéma d'une installation pour la mise en oeuvre du procède de l'invention. The description which follows refers to the accompanying drawing of the is the diagram of an installation for implementing the method of the invention.

Cette installetion comprend essentiellement un appareil de cristallisation à marche continue iC > , un malaxeur 12, un mélangeur-dilueur LÇ, un broyeur 16. un malaxeur à magma 18, un échangeur de chaleur 20 et des pompes 22, 24, 26 et 28. This installation essentially comprises an iC> continuous-running crystallization apparatus, a mixer 12, a mixer-diluent LÇ, a grinder 16. a magma mixer 18, a heat exchanger 20 and pumps 22, 24, 26 and 28.

Tous ces appareils sont connus et couramment utilisés en sucrerie.All these devices are known and commonly used in the sugar industry.

La masse-cuite produite dans l'appareil 10 est extraite en continu par la pompe 22 oui alimente le malaxeur 12. Une fraction de la masse-cuite est prélevée au moyen de la pompe 24 et envoyée au mélangeur-dilueur 14 qui est également alimenté en sirop par la pompe 28. rivant d'alimenter l'appareil 14 le sirop est réchauffé dans l'échangeur 20 au moyen d'eau chaude ; un régulateur 30 maintient la température du sirop sortant de 1 'échangeur 20 à une valeur de consigne en agissant sur une vanne contrant le débit d'eau. La consigne du régulateur de température 30 est fonction du brix du sirop, mesurée par le gammadensimètre 40. The mass-cooked produced in the apparatus 10 is continuously extracted by the pump 22 yes feeds the mixer 12. A fraction of the mass-cooked is taken by means of the pump 24 and sent to the mixer-diluent 14 which is also supplied in syrup by the pump 28. supplying the device 14 the syrup is heated in the exchanger 20 by means of hot water; a regulator 30 maintains the temperature of the syrup leaving the exchanger 20 at a set value by acting on a valve controlling the flow of water. The temperature regulator 30 setpoint is a function of the brix of the syrup, measured by the gammadensimeter 40.

La masse-cuite diluée sortant du mélangeur 14 alimente le broyeur 16 ; sa dilution est réglée au moyen du régulateur 32 qui agit sur une vanne contrElant le débit de sirop entrant dans l'appareil 14 de façon à maintenir à une valeur de consigne la température du magma a la sortie du broyeur 16. The diluted mass-cooked leaving the mixer 14 feeds the crusher 16; its dilution is adjusted by means of the regulator 32 which acts on a valve controlling the syrup flow entering the apparatus 14 so as to maintain the magma temperature at the outlet of the mill 16 at a set value.

Dans le broyeur 16, les cristaux de la masse-cuite sont fragmentés de telle sorte que 1 la dimension moyenne des cristau:: contenus dans le magma sortant du broyeur soit environ le tiers de celle des cristal contenus dans la masse-cuite diluée rt entrant. Le broyeur pourra, par exemple, être du type à cane et constitué par un stator en forme de tronc de cône, a 1 intérieur duquel tourne un rotor en forme de cône, la grosseur moyenne des cristau: broyés étant fonction de l'écartement entre rotor et stator. In the crusher 16, the crystals of the mass-cooked are fragmented so that 1 the average dimension of the crystals contained in the magma leaving the crusher is approximately one third that of the crystals contained in the diluted mass-cured rt entering . The crusher could, for example, be of the cane type and constituted by a stator in the form of a truncated cone, inside 1 of which rotates a cone-shaped rotor, the average size of the crystals: crushed being a function of the spacing between rotor and stator.

Le magma produit peut être envoyé dans le malaxeur 18 servant de réservoir tampon. Ce malaxeur aura une faible capacité correspondant à un temps de séjour du magma d'environ une demie heure. Il est soutiré du malaxeur 18 par la pompe 26 qui alimente l'appareil de cristallisation à; marche continue 10. Le débit de la pompe 26 est réglé, par une chai ne de régulation non-représentée, pour satisfaire en permanence aux besoins de l'appareil 10, Un régulateur de niveau 36 commande la vitesse de rotation de la pompe 24 pour maintenir le débit de masse-cuite prélevée proportionnel au débit de magma consommé. The magma produced can be sent to the mixer 18 serving as a buffer tank. This mixer will have a low capacity corresponding to a residence time of the magma of about half an hour. It is withdrawn from the mixer 18 by the pump 26 which supplies the crystallization apparatus; continuous operation 10. The flow rate of the pump 26 is adjusted, by a control chain not shown, to permanently satisfy the needs of the apparatus 10, A level regulator 36 controls the speed of rotation of the pump 24 for maintain the flow of mass-cooked removed proportional to the flow of magma consumed.

Au lieu d'utiliser pour la production du magma de la masse-cuite prélevée à la sortie de l'appareil 10, on pourrait utiliser une masse-cuite soutirée en un point intermédiaire de l'appareil. Instead of using for the magma of the mass-cooked sampled at the exit of the apparatus 10, one could use a mass-cooked withdrawn at an intermediate point of the apparatus.

La consigne du régulateur de température 30 est choisie pour que la masse-cuite entrant dans le broyeur 16 soit légèrement sous-saturée d'est-à-dire que son coefficient de saturation soit compris dans le fourchette 0.95 b 1,00. En rendant cette consigne fonction du brix du sirop on réalise un contrôle rigoureu du coefficient de saturation. The setpoint of the temperature regulator 30 is chosen so that the mass-cooked material entering the grinder 16 is slightly undersaturated, that is to say that its saturation coefficient is within the range 0.95 b 1.00. By making this setpoint function of the syrup's brix, a rigorous control of the saturation coefficient is carried out.

La consigne de température du régulateur Z-2 est choisie pour que le magma ait une teneur en cristaux prédéterminée. The temperature setpoint of the Z-2 regulator is chosen so that the magma has a predetermined crystal content.

A titre d'exemple. pour produire 8 t/h de magma ayant une teneur en cristaux de 30f. à partir d'une masse-cuite ayant une température de 790C, on dilue cette dernière avec un sirop ayant un brix de 74 et maintenu à une température de 750C, le débit de sirop étant réglé de façon à maintenir la température du magma, à la sortie du broyeur, à 850 C.  For exemple. to produce 8 t / h of magma having a crystal content of 30f. starting from a massecuite having a temperature of 790C, the latter is diluted with a syrup having a brix of 74 and maintained at a temperature of 750C, the syrup flow rate being adjusted so as to maintain the temperature of the magma, at the outlet of the mill, at 850 C.

Claims (1)

KEVENDICATIONSKEVENDICATIONS 1. Procédé de production d'un magma d'ensemencement pour un appareil de cristallisation à marche continue selon la revendication 1 du brevet principal, caractérisé en ce que le débit du liquide utilisé pour diluer la masse-cuite est réglé en fonction de la température du magma à la sortie du broyeur.1. A method of producing a seed magma for a continuous-running crystallization apparatus according to claim 1 of the main patent, characterized in that the flow rate of the liquid used to dilute the mass-cooked is regulated as a function of the temperature magma at the outlet of the grinder. Procédé selon la revendication 1, caractérisé en ce que la température du magma à la sortie du broyeur est maintenue égale-à une valeur de consigne qui est fonction du débit, de la température et de la teneur en cristaux de la masse-cuite utilisée, d dérit, de la température et du brui;: du liquide de dilution et du tau: de rédu=tion des cristaux voulu.  Process according to claim 1, characterized in that the temperature of the magma at the outlet of the mill is maintained equal to a set value which is a function of the flow rate, the temperature and the crystal content of the mass-cooked used, d drift, temperature and noise ;: dilution liquid and tau: reduction of crystals desired.
FR878700761A 1986-08-01 1987-01-23 PROCESS FOR PRODUCING A SEED MAGMA FOR A CONTINUOUS-MARKET CRYSTALLIZATION APPARATUS Expired FR2609903B2 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
FR878700761A FR2609903B2 (en) 1987-01-23 1987-01-23 PROCESS FOR PRODUCING A SEED MAGMA FOR A CONTINUOUS-MARKET CRYSTALLIZATION APPARATUS
ES87401616T ES2015589B3 (en) 1986-08-01 1987-07-09 PROCEDURE AND INSTALLATION FOR THE PRODUCTION OF A SEED MAGMA FOR A CONTINUOUS CRYSTALLIZATION APPARATUS.
AT87401616T ATE54055T1 (en) 1986-08-01 1987-07-09 METHOD AND DEVICE FOR THE PREPARATION OF AN INOCULATION SUSPENSION FOR A CONTINUOUSLY OPERATING CRYSTALLIZATION PLANT.
DE8787401616T DE3763364D1 (en) 1986-08-01 1987-07-09 METHOD AND DEVICE FOR PRODUCING A VACUUM SUSPENSION FOR A CONTINUOUSLY WORKING CRYSTALIZATION SYSTEM.
EP87401616A EP0255786B1 (en) 1986-08-01 1987-07-09 Process and device for producing a magma of seed crystals for a continuous-crystallization apparatus
PL1987266837A PL154185B1 (en) 1986-08-01 1987-07-15 A method of inoculation magma production in a crystallizer of a constant action and a system for inoculation magma production in a crystallizer of a cinstant action
AU75958/87A AU591313B2 (en) 1986-08-01 1987-07-21 Method and equipment for production of a seeding magma for a continuous crystallization apparatus
GR90400444T GR3000634T3 (en) 1986-08-01 1990-07-09 Process and device for producing a magma of seed crystals for a continuous-crystallization apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR878700761A FR2609903B2 (en) 1987-01-23 1987-01-23 PROCESS FOR PRODUCING A SEED MAGMA FOR A CONTINUOUS-MARKET CRYSTALLIZATION APPARATUS

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Publication Number Publication Date
FR2609903A2 true FR2609903A2 (en) 1988-07-29
FR2609903B2 FR2609903B2 (en) 1989-10-06

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FR878700761A Expired FR2609903B2 (en) 1986-08-01 1987-01-23 PROCESS FOR PRODUCING A SEED MAGMA FOR A CONTINUOUS-MARKET CRYSTALLIZATION APPARATUS

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972779A (en) * 1974-07-26 1976-08-03 Texaco Inc. Means for controlling dewaxing apparatus
US4155774A (en) * 1977-08-09 1979-05-22 Randolph Ellwood A Process for controlling the rate of growth of particulate masses

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972779A (en) * 1974-07-26 1976-08-03 Texaco Inc. Means for controlling dewaxing apparatus
US4155774A (en) * 1977-08-09 1979-05-22 Randolph Ellwood A Process for controlling the rate of growth of particulate masses

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FR2609903B2 (en) 1989-10-06

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