EP0201629B1 - Procédé et appareil de cristallisation continue par évaporation pour la préparation du sucre - Google Patents

Procédé et appareil de cristallisation continue par évaporation pour la préparation du sucre Download PDF

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Publication number
EP0201629B1
EP0201629B1 EP85114973A EP85114973A EP0201629B1 EP 0201629 B1 EP0201629 B1 EP 0201629B1 EP 85114973 A EP85114973 A EP 85114973A EP 85114973 A EP85114973 A EP 85114973A EP 0201629 B1 EP0201629 B1 EP 0201629B1
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EP
European Patent Office
Prior art keywords
suspension
chamber
heating
flow
chambers
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
EP85114973A
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German (de)
English (en)
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EP0201629A2 (fr
EP0201629A3 (en
Inventor
Siegfried Dipl.-Ing. Matusch
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.)
BMA Braunschweigische Maschinenbauanstalt AG
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BMA Braunschweigische Maschinenbauanstalt AG
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Publication of EP0201629A3 publication Critical patent/EP0201629A3/de
Application granted granted Critical
Publication of EP0201629B1 publication Critical patent/EP0201629B1/fr
Anticipated expiration legal-status Critical
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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
    • C13B30/02—Crystallisation; Crystallising apparatus
    • C13B30/022—Continuous processes, apparatus therefor

Definitions

  • the invention relates to a process for continuous evaporation crystallization from a suspension for the extraction of sugar consisting of juice and crystals, in which concentrated feed dissolution and crystal base magma are continuously fed into a first treatment room and product magma is continuously withdrawn from the last treatment room, the suspension being successively used by several separate, round treatment rooms are passed through and placed in each treatment room with simultaneous supply of heat in an internal circulation flow and level-controlled from the individual treatment rooms to the next following treatment room.
  • the invention further relates to a device for carrying out such a method with treatment rooms which are arranged one above the other as separate cylindrical apparatus chambers, a tapering chamber floor tapering downwards, a heating medium through which a heating medium flows with intermediate spaces through which the suspension can flow, and devices for removing the Brüdens and for transferring the suspension from the upper to the lower apparatus chamber.
  • each apparatus chamber is designed in accordance with the agitator boilers for discontinuous crystallization.
  • a heating chamber with radially external heating elements, a central guide tube and an agitator held at the bottom are provided above the chamber base.
  • the agitators in the apparatus chamber through which the first flow passes are designed as high-speed mixing stirrers, while the agitators in the subsequent chambers are designed as low-speed circulation stirrers.
  • the chambers there are level controls for leveling the level just above the heating chamber.
  • the high-speed mixing stirrers cause highly turbulent shear fields and a visible circulation flow, while the low-speed stirrers only lead to an essentially laminar circulation flow.
  • the suspension is kept in a concentric ring circulation flow in all apparatus chambers with the intake juice being fed in on the suction side.
  • the suspension is withdrawn from the individual treatment rooms on the pressure side and fed to the next treatment room on the suction side.
  • an inlet pipe opening out above the stirrer of the respective apparatus chamber is connected to a feed line via a control valve.
  • a suspension discharge pipe equipped with a control valve or a control flap is provided and connected to a suspension supply pipe of the next chamber.
  • the control valve of the feed pipe for the intake juice is equipped with a sensor arranged in the associated apparatus chamber to determine the viscosity, the electrical conductivity, the density or the boiling point increase of the suspension and the control valve or the control flap of the suspension drain pipe with one in the same apparatus chamber just above the Heating device arranged level sensor or switch connected.
  • the object of the invention is to improve the method explained at the outset with regard to the suspension residence time distribution and to simplify the device for carrying out the method.
  • This object is achieved in that the suspension rotates once in each treatment room on a spiral path, which is caused by the superimposition of a forced circular movement caused by the feeding of further suspensions around the axis of the treatment room and by the mammoth pump effect occurring in the heating area generated orbital movement results.
  • suspension is also alternately guided up and down on the positively guided circular path, so that a corrugated spiral path results.
  • the transfer of the suspension from one treatment room to the next treatment room can take place in the free overflow;
  • the level of the suspension in each treatment room can be regulated by controlling the overflow height.
  • syrup can also be fed into at least some treatment rooms in a controlled manner.
  • each apparatus chamber is arranged around a central guide tube which is open at the top and bottom and comprises a plurality of heating chambers which, in terms of their spaces through which the suspension flows, through in the circumferential direction Partitions arranged at the same angular distance from one another are delimited from one another, but are in flow connection with one another via defined flow cross sections in the circumferential direction, which form a forced guide for the suspension in the circumferential direction, the first heating chamber seen in the flow direction of the suspension and the last heating chamber one Have suspension overflow that with the suspension inlet of the underlying Apparatus chamber is connected.
  • the guide tube is divided into segments by the partition walls mentioned, which are closed on the casing side and are only in flow-exchanging connection with the associated heating chamber for the suspension on the floor and ceiling sides.
  • a partition wall alternately projects above the maximum suspension level between two heating chambers, but has a suspension circulation opening below the heater above the conical chamber floor, while the partition wall following in the flow direction of the suspension has an upper overflow into the has the following heating chamber and seals the bottom of the chamber in a flow-tight manner.
  • each apparatus chamber is structurally particularly simple and basically does not require any control. It is particularly advantageous that the desired flow circulation of the suspension is achieved without agitators or other driven agitating or mixing tools. However, since the flowability of the suspension from top to bottom is getting worse, it can be advantageous, depending on the consistency of the suspension, in the lowest apparatus chamber or in the lower apparatus chambers, e.g. the bottom two chambers to provide driven stirring or mixing tools, e.g. can be designed as a lifting system according to the device as described in German patent application DE-A-35 17 511.7. Such a lifting system would serve to support the mammoth pump effect.
  • the superimposed apparatus chambers can be connected to one another.
  • the vapor is then drawn off via a juice separator on the top chamber of the apparatus.
  • the pressure is the same in all of the apparatus chambers.
  • the vapors are fed to a condenser and the non-condensable gases to a water ring pump.
  • the atmosphere in the vapors is under atmospheric pressure.
  • the evaporation crystallization tower shown consists of cylindrical apparatus chambers 1, which are separated from one another and are arranged one above the other, the number of which results from the amount of magma to be generated.
  • Each apparatus chamber 1 has a chamber floor 2 which tapers downwards in a conical shape and is provided with a central flow cone 3, which at the same time forms a chimney hood for a vapor outlet, which merges upwards into a vertical central vapor tube 4. Only in the lowest apparatus chamber is such a vapor extraction not provided.
  • the apparatus chambers 1 can be connected to one another on the vapor side.
  • the vapor is then drawn off via a juice separator 5 on the upper apparatus chamber 1; in this embodiment there is then the same pressure in all apparatus chambers 1.
  • the vapors are fed to a condenser, not shown, the non-condensable gases to a water ring pump, also not shown.
  • the atmosphere in the vapors is under atmospheric pressure.
  • each apparatus chamber 1 there is also a heater 6 through which a heating medium, preferably steam, flows and which is arranged around a central guide tube 7 which is open at the top and bottom and the upper edge of which is flush with the upper edge of the heater 6.
  • the heater 6 of each apparatus chamber 1 comprises four heating chambers 8, 9, 10, 11, which are each limited by radial dividing walls 12 arranged in the circumferential direction at the same angular distance from one another, the guide tube 7, the flow cone 3, the chamber bottom 2 and the jacket of the corresponding apparatus chamber 1.
  • the partition walls 12 also divide the guide tube 7 into segments 13, which are closed on the casing side by the vapor tube 4, the guide tube 7 and the partition walls 12 and are only in flow-exchanging connection on the floor and ceiling sides with the associated heating chamber 8-10.
  • the heater 6 consists of concentrically spaced double-walled ring segments 6a, which are connected to each other in terms of flow and are associated with diametrically opposed, hollow partition walls 12 and have a steam inlet or outlet 14.
  • a valve-controlled inlet 16 for concentrated feed dissolution (syrup) and a further valve-controlled inlet 17 for crystal-foot magma are provided in the uppermost apparatus chamber 1. Both inlets 16, 17 open into a suspension inlet 18 at the beginning of the first heating chamber 8, from where the suspension flows in succession through the four heating chambers 8-11, in order to then pass through a suspension overflow 19 in the last heating chamber 11 the suspension inlet 18 of the apparatus chamber 1 underneath reach.
  • the suspension level 20 is set in each apparatus chamber 1 by overflow flaps 21.
  • the ring segments 6a In order to form a positive guide for the suspension in the circumferential direction of each apparatus chamber 1, the ring segments 6a have intermediate spaces through which the suspension flows, which are delimited by the partition walls 12 mentioned from the respectively adjacent heating chamber 8-11.
  • the separating wall 12 between the heating chambers 8 and 9 seen in the flow direction of the suspension also projects beyond the maximum suspension level 20, but is at a clear distance from the chamber bottom 2, forming a suspension circulation opening 22, while the downstream one seen in the flow direction of the suspension is the
  • the heating chamber 9 separating the heating chamber 10 from the partition 12 is connected to the chamber bottom 2 in a flow-tight manner, but has an upper overflow 23 into the subsequent heating chamber 10 for the suspension.
  • the partition 12 that then follows between the heating chambers 10 and 11 corresponds in its design to the partition between the heating chambers 8 and 9.
  • the suspension formed from the two inlets 16, 17 thus flows downward from the suspension inlet 18 between the ring segments 6a of the first heating chamber 8 in order to pass through the suspension circulation opening 22 of the partition wall 12 into the subsequent heating chamber 9, where the Suspension flows upwards between the ring segments 6a and reaches the heating chamber 10 via the overflow 23, from which in turn flows through the suspension circulation opening 22 below into the last heating chamber 11, from which the suspension then flows via the suspension overflow 19 into the Suspension inlet 18 of the underlying apparatus chamber 1 arrives.
  • the suspension is therefore positively guided on a circular path and alternately directed upwards and downwards on this circular path, so that there is a wavy flow course which is closed to form a circular ring.
  • a valve-controlled feed line 24 for additional syrup opens into the suspension inlet 18 of each apparatus chamber 1, which is added to the inlet of each apparatus chamber 1 in a controlled manner depending on the magma consistency. After the suspension has passed through all the apparatus chambers 1 from top to bottom, the product magma is drawn off from the bottom 2 of the lowest apparatus chamber 1 via an outlet 25.
  • Figure 1 shows circumferentially offset longitudinal sections for the individual apparatus chambers 1.
  • a partition wall 12 with an overflow 23 corresponding to the partition wall between the heating chambers 9 and 10 is shown, while the second and bottom apparatus chamber partition walls 12 according to the partition walls between the heating chambers 8 and 9 and 10, respectively and 11 show.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Confectionery (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (16)

1. Procédé de cristallisation continue par évaporation dans une suspension constituée par un jus et des cristaux pour la préparation du sucre, dans lequel une solution d'alimentation concentrée ainsi qu'un magma de pied-decuite sont amenés en continu dans une première chambre de traitement et du magma produit est soutiré en continu de la dernière chambre de traitement, la suspension est guidée successivement à travers plusieurs chambres de traitements séparées l'une de l'autre et, en même temps qu'est fournie de la chaleur, la suspension est mise en circulation interne et, le niveau étant contrôlé est amenée à partir des chambres de traitement individuelles à la chambre de traitement respectivement suivante, caractérisé en ce que la suspension circule une fois dans chaque chambre de traitement selon une trajectoire spirale qui résulte de la superposition d'un mouvement circulaire forcé autour de l'axe de la chambre de traitement provoqué par l'arrière d'autres suspensions, et d'un mouvement circulaire produit par l'effet de pompe d'un élévateur à air comprimé.
2. Procédé selon la revendication 1, caractérisé en ce que la suspension est, en plus, guidée alternativement vers le haut et vers le bas sur la trajectoire circulaire forcée, ce qui produit une trajectoire spirale ondulée.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le passage de la suspension d'une des chambres de traitement à la chambre suivante s'effectue en trop plein libre.
4. Procédé selon la revendication 3, caractérisé en ce qu'en commandant le niveau du trop plein, on règle le niveau de la suspension dans chaque chambre de traitement.
5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on introduit en plus, au moins dans quelques chambres de traitement, du sirop en réglant le débit d'arrivée.
6. Dispositif pour mettre en oeuvre le procédé selon l'une des revendications précédentes, avec des chambres de traitement qui sont disposées l'une au-dessus de l'autre en tant que chambres d'appareil (1) cylindriques séparées les unes des autres, qui comportent un fond de chambre (2) se rétrécissant en forme de cône vers le bas, un chauffage (6) parcouru par un fluide de chauffage avec des chambres intermédiaires traversées par la suspension, ainsi que des dispositifs (3, 4, 5) pour évacuer les vapeurs et pour transférer la suspension de la chambre d'appareil (1) supérieure dans la chambre respectivement inférieure, caractérisé en ce que le chauffage (6) de chaque chambre d'appareil (1) est disposé autour d'un conduit (7) central ouvert en haut et en bas et comporte plusieurs chambres de chauffage (8-11) dont les chambres intermédiaires traversées par la suspension sont délimitées l'une par rapport à l'autre par des cloisons de séparation (12) disposées à intervalles angulaires réguliers dans le sens de la périphérie, mais sont toutefois en liaison d'écoulement l'une avec l'autre par des sections d'écoulement définies (22, 23), qui constituent un guidage forcé dans le sens de la périphérie pour la suspension, la première chambre de chauffage (8) comportant, vu dans le sens d'écoulement de la suspension, une entrée de suspension (18) et la dernière chambre de chauffage (11) comportant un trop plein de suspension (19), qui est relié à l'entrée de suspension (18) de la chambre d'appareil (1) située en dessous.
7. Dispositif selon la revendication 6, caractérisé en ce que le conduit (7) est divisé par les cloisons de séparation (12) précitées en secteurs (13) qui sont fermés du côté de la surface latérale et sont reliés par échange d'écoulement seulement du côté du fond et du dessus avec la chambre de chauffage associée (8-11) pour la suspension.
8. Dispositif selon la revendication 7, caractérisé en ce que le bord supérieur du conduit (7) affleure au niveau du bord supérieur respectif du chauffage (6).
9. Dispositif selon la revendication 6, 7 ou 8, caractérisé en ce que pour former les sections d'écoulement définies précitées (22, 23) entre deux chambres de chauffage (8, 9, 9, 10, 10, 11), une cloison de séparation (12) dépasse alternativement le niveau de suspension maximal (20) mais comporte toutefois en dessous du chauffage (6), au-dessus du fond de chambre conique (2), une ouverture de circulation (22) pour la suspension, tandis que la cloison de séparation (12) suivante, dans le sens d'écoulement de la suspension, comporte un trop plein supérieur (23) allant dans la chambre de chauffage suivante (6) et forme une fermeture étanche à l'écoulement avec le fond de la chambre (2).
10. Dispositif selon l'une des revendications 6 à 9, caractérisé en ce que le chauffage (6) est constitué par des segments annulaires (6a) à double paroi disposés concentriquement à une certaine distance l'un de l'autre.
11. Dispositif selon la revendication 10, caractérisé en ce qu'au moins deux cloisons de séparation (12) diamétralement opposées sont réalisées à paroi creuse, et relient les segments annulaires associés (6a) du chauffage (6) pour assurer l'écoulement.
12. Dispositif selon l'une des revendications 6 à 11, caractérisé par des volets de trop plein (21) pour régler le niveau de suspension (20) dans chaque chambre d'appareil (1).
13. Dispositif selon l'une des revendications 6 à 12, caractérisé en ce que chaque font de chambre (2) comporte un cône d'écoulement (3) placé au centre.
14. Dispositif selon la revendication 13, caractérisé en ce que le cône d'écoulement (3) précité constitue en même temps un capuchon de cheminée pour l'évacuation des vapeurs, lequel se raccorde vers le haut à un conduit de vapeurs (4) central vertical.
15. Dispositif selon l'une des revendications 6 à 14, caractérisé en ce qu'une canalisation d'alimentation (24) commandée par un clapet pour le sirop supplémentaire, débouche dans l'entrée de suspension (18) de chaque chambre d'appareil (1
16. Dispositif selon l'une des revendications 6 à 15, caractérisé en ce qu'on prévoit dans la chambre d'appareil (1) la plus basse, ou dans les chambres d'appareil (1) inférieures des instruments de malaxage ou d'agitation entraînés.
EP85114973A 1985-05-15 1985-11-26 Procédé et appareil de cristallisation continue par évaporation pour la préparation du sucre Expired - Lifetime EP0201629B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853517511 DE3517511A1 (de) 1985-05-15 1985-05-15 Kuehlungskristallisationsturm fuer zucker-magma
DE3517511 1985-05-15

Publications (3)

Publication Number Publication Date
EP0201629A2 EP0201629A2 (fr) 1986-11-20
EP0201629A3 EP0201629A3 (en) 1988-08-24
EP0201629B1 true EP0201629B1 (fr) 1990-09-19

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Application Number Title Priority Date Filing Date
EP85114973A Expired - Lifetime EP0201629B1 (fr) 1985-05-15 1985-11-26 Procédé et appareil de cristallisation continue par évaporation pour la préparation du sucre

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EP (1) EP0201629B1 (fr)
DE (2) DE3517511A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1208242B (it) * 1987-02-11 1989-06-12 Eridania Procedimento e dispositivo per la cristallizzazione di massecotte di media e bassa purezza
IT1232751B (it) * 1989-06-14 1992-03-05 Eridania Procedimento e dispositivo per l'ingrossamento continuo dei cristalli preformati delle massecotte
WO2001091875A1 (fr) * 2000-06-01 2001-12-06 The Tongaat-Hulett Group Limited Appareil de cuisson a vide continu
WO2003016576A1 (fr) 2001-08-14 2003-02-27 Bruce Stclair Moor Appareil de cristallisation par evaporation continue
ATE533864T1 (de) * 2006-03-30 2011-12-15 Spray Engineering Devices Ltd Verbesserte vertikale kontinuierliche vakuumpfanne
CN102227508A (zh) 2008-10-01 2011-10-26 唐加特胡雷特有限公司 连续真空炼锅
CN106512461B (zh) * 2016-11-30 2019-04-12 江苏润普食品科技股份有限公司 一种粒状丙酸钙的低温蒸发结晶装置及工艺
DE102019123903B4 (de) * 2019-09-05 2023-01-12 Bma Braunschweigische Maschinenbauanstalt Ag Kühlungskristallisator und Verfahren zur Zuckerkristallisation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971480C (de) * 1955-07-29 1959-02-05 Ernst Dr Lange Mehrgliedriger Verdampfer mit senkrecht stehenden Heizrohren fuer die Zuckerindustrie
DE1054065B (de) * 1958-05-08 1959-04-02 Buckau Wolf Maschf R Ringheizkammer mit Stufenschaltung fuer Vakuumkocher
FR1486046A (fr) * 1966-07-06 1967-06-23 Lang Gepgyar Appareil de concentration sous vide
ZA775459B (en) * 1977-09-12 1979-02-28 Huletts Sugar Improvements in continuous vacuum crystallisers
DE3120732A1 (de) * 1981-05-25 1982-12-09 Erich Prof. Dr. 3340 Wolfenbüttel Reinefeld "verfahren und vorrichtung zur kontinuierlichen verdampfungskristallisation"
DE3203141C2 (de) * 1982-01-30 1983-12-01 Salzgitter Maschinen Und Anlagen Ag, 3320 Salzgitter Verfahren und Vorrichtung zur Kühlung von Zuckerfüllmasse in einer Vertikalmaische
DE3336112C1 (de) * 1983-10-05 1985-03-07 Selwig & Lange GmbH, 3300 Braunschweig Vertikalkühlmaische für Zuckermagma mit vertikal oszillierenden Rührelementen

Also Published As

Publication number Publication date
DE3517511C2 (fr) 1988-11-24
DE3517511A1 (de) 1986-11-20
EP0201629A2 (fr) 1986-11-20
EP0201629A3 (en) 1988-08-24
DE3579811D1 (de) 1990-10-25

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