EP0217238A1 - Process and apparatus for extracting sugar from sugar cane - Google Patents

Process and apparatus for extracting sugar from sugar cane Download PDF

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Publication number
EP0217238A1
EP0217238A1 EP86112893A EP86112893A EP0217238A1 EP 0217238 A1 EP0217238 A1 EP 0217238A1 EP 86112893 A EP86112893 A EP 86112893A EP 86112893 A EP86112893 A EP 86112893A EP 0217238 A1 EP0217238 A1 EP 0217238A1
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EP
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Prior art keywords
tank
magma
cell
cylinders
juice
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EP86112893A
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German (de)
French (fr)
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EP0217238B1 (en
Inventor
Alain Gautier
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Maguin SAS
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Maguin SAS
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    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/02—Expressing juice from sugar cane or similar material, e.g. sorghum saccharatum
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/02—Expressing juice from sugar cane or similar material, e.g. sorghum saccharatum
    • C13B10/04—Expressing juice from sugar cane or similar material, e.g. sorghum saccharatum combined with imbibition

Definitions

  • the invention relates to the extraction of sugar from sugar cane.
  • the conventional extraction process the oldest known, consists of crushing the canes using a knife crusher to open the cells, then passing the preparation obtained through cane mills made of fluted cylinders exerting a great pressure between them of 50 to 100 bars.
  • the installation is relatively expensive and consumes a large amount of energy for driving these cylinders.
  • the extraction efficiency to be excellent, requires a significant installation.
  • the conventional process was subsequently taken up to improve it and lead to the rebimbing process.
  • This process essentially consists of watering the cane prepared with extracted juice, then crushing it again in a mill according to the first, the process being continued using several re-soaking and several successive mills, in order to improve the extraction yield.
  • the result is that the overall efficiency of the equipment is improved.
  • the complete installation remains expensive, cumbersome and consumes a great deal of energy, in return for the increase in extraction efficiency.
  • the object of the invention is to provide an extraction process with good efficiency and low cost which avoids the above drawbacks, in particular which reduces the size of the installations and which implements a lower power than that of conventional methods. , even if they were improved, this being mainly obtained by multiple low pressure passages in an aqueous medium thus methodically avoiding air intake.
  • the invention consists in pressing the previously prepared canes, then the magma (preparation and juice) between several pairs of fluted cylinders, each pair being completely immersed in a tank and fed by a hopper, and this by combining recirculation on the one hand constant of the magma, from each tank to the corresponding hopper, with a large flow, and on the other hand a counter-current circulation of the preparation and of the juice with a lower flow in the various tanks corresponding to the various pairs of cylinders.
  • the installation for implementing this process therefore comprises a series of tanks, in reduced number, each containing a pair of fluted cylinders surmounted by a feed hopper, with means for recycling and other means. to ensure the counter-current circulation of the preparation and the juice.
  • the circulation of the juice is advantageously done by simple overflow from one tank to another, the tanks being placed at stepped heights, with recirculating magma pumps raising the magma from a tank to the corresponding hopper, and transfer magma pumps raising the magma from a tank to the hopper of the tank located upstream (or to the bagasse outlet for the most upstream tank).
  • the transfer pumps each pour the magma onto a separator with a curved grid, the dripping juice being brought back to the tank from which the magma comes, while the coarsely drained preparation flows by gravity in the corresponding hopper or towards the exit.
  • the juice transfer chutes by overflowing from an upstream tank to a downstream tank are preferably also equipped with a curved grid constantly swept by the paddles of a rotary reel in order to let the juice pass but to constantly bring back the preparation in the upstream tank.
  • Each extraction cell comprises, according to the invention, a pair of grooved cylinders 1 and 2 with horizontal axes, 3 and 4, completely submerged in a tank C.
  • the cylinder 1 is motor, and its axis 3, without travel, passes through the walls of the tank by caulks 5, one of the ends of the shaft 3 being driven by a gearmotor mechanism 6 optionally at variable speed.
  • the other roller 2 has its axis 4 which spins in bearings 7 located at the end of the substantially vertical branches 8 of a stirrup, partially submerged, ensuring the horizontal movement of the shaft 4 without requiring any wall crossing.
  • This stirrup is made up, in addition to the vertical branches 8, by a shaft 9 mounted in bearings 10 fixed on the tank.
  • the pressurization of the cylinder 2 on the cylinder 1 is ensured by one or two lateral jacks 11 located outside the tank C.
  • the cylinder 2 with travel is mounted idly, and driven directly by the engine cylinder 1 by the intermediate large grooves 12 which mesh with each other.
  • a feed hopper 13 constituted by two end flanges 14, connecting in an almost sealed manner with the end faces of the cylinders, and two vertical side walls 15 connecting with the periphery of these cylinders.
  • Each hopper 13 has a double feed: on the one hand, a pipe 16 drains magma into it and on the other hand, a separator 17 with a curved grid 18 d pours out of the coarsely drained preparation, the dripping juice leaving in 19 for be returned to the downstream tank.
  • Each tank C comprises an overflow outlet chute 20, also closed by a curved grid 21, the surface of which is continuously swept by the blades 22 of a reel 23 driven in rotation in the direction of the arrow 24 by a geared motor 25, this so as to constantly bring back towards the tank the preparation which accumulates against the grid 21.
  • the tank C also comprises an inlet chute 26 for the tank C 3 most upstream, this inlet chute being constituted by the outlet chute 20 of the previous tank for the other tanks C 2 , C 1 .
  • the tank C has two pipe outlets 27 and 28 for the magma.
  • each outlet chute 20 is connected to the inlet 26 of the next tank, as shown more particularly in FIG. 1.
  • the installation is completed by a series of pumps intended to ensure systematic circulation.
  • recirculation pumps R 1 , R 2 and R 3 , associated respectively with the three tanks C 1 , C 2 and C 3 , and which are magma pumps sucking the magma in the outlet 27 of each tank and pushing it back into the feed 16 of the corresponding hopper 13.
  • transfer pumps T 1 , T 2 and T 3 which are also magma pumps connected to the outlet 28 of the corresponding tank and which discharge the magma at 29, above the curved grid separator 17 of the upstream tank for T 1 and T 20 or at 30 above a last separator with a curved grid 17 supplying the bagasse outlet 31.
  • the juice outlets 19 of the various separators 17 pour the juice into the downstream tank, that is to say the tank from which the magma pumped comes, this by simple natural flow, or using a pump 32 if necessary.
  • the prepared canes are fed at 33 into the hopper of the downstream tank. They are pressed by the first pair of cylinders and recycled several times by positive drive thanks to systematic recirculation. Naturally, the speed of the cylinders is adjusted as a function of both the flow of rods arriving at 33 and the recirculation flow arriving at 16, and the recirculation pump of each tank is adjusted to ensure this flow with a slight excess which s 'flows through the weir 34 that each hopper 13 comprises. According to the invention, the various parameters are determined so that the recycling rate is much higher than the rate of main product, for example five times this rate. Each cell therefore operates in principle five press-rebimbitions, which considerably increases the efficiency of the installation and in particular makes it possible to obtain good extraction yields with a reduced number of extraction cells, for example three in 1 example shown.
  • the juice circulates in the opposite direction, starting from weakly concentrated products originating from the mixture of the juice recovered at 26, press water returned to 35 and pure water sent to 36, this mixture being enriched with sugar in the tank C 3 and circulating from upstream to downstream with a progressively increasing concentration, to exit at 37 at its maximum concentration from where it is then purified and separated by the usual means.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Saccharide Compounds (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Compounds Of Unknown Constitution (AREA)

Abstract

Processing and outfit for the extraction of cane sugar by pressing canes and magma between several pairs of fluted rollers, wherein each pair of rollers is completely submerged in a tank (C) and fed through a hopper (13), and wherein a constant recirculation of the magma, from each tank towards the corresponding hopper, with a significant flow rate on the one hand, and a countercurrent circulation of the bagasse and the juice with a lower flow rate in the different tanks (C1, C2, C3) corresponding to the different pairs of rollers on the other, are combined.

Description

L'invention concerne l'extraction du sucre à partir de la canne à sucre.The invention relates to the extraction of sugar from sugar cane.

Le procédé conventionnel d'extraction, le plus anciennement connu, consiste à broyer les cannes à l'aide d'un broyeur à couteaux afin d'ouvrir les cellules, puis à faire passer la préparation obtenue dans des moulins à canne constitués de cylindres cannelés exerçant entre eux une grande pression de 50 à 100 bars. L'installation est relativement coûteuse et consomme une grande quantité d'énergie pour l'entraînement de ces cylindres. En outre, le rendement d'extraction, pour être excellent, requiert une installation importante.The conventional extraction process, the oldest known, consists of crushing the canes using a knife crusher to open the cells, then passing the preparation obtained through cane mills made of fluted cylinders exerting a great pressure between them of 50 to 100 bars. The installation is relatively expensive and consumes a large amount of energy for driving these cylinders. In addition, the extraction efficiency, to be excellent, requires a significant installation.

L'utilisation du procédé de diffusion pour l'extraction du sucre- de betterave a amené les constructeurs à en rechercher l'adaptation pour le sucre de canne. Dans un tel procédé par diffusion, les carmes broyées sont mises en suspension dans de l'eau pour opérer l'extraction par diffusion, macération et percolation. La diffusion a lien dans de grands appareils selon le procédé classique d'épuisement, par contre-courant, ce qui conduit à des temps d'extraction et surtout des volumes de cuves importants, donc à des installations coûteuses et encombrantes, avec en outre des difficultés de conduite dues en particuliers à des problèmes de fermentation.The use of the diffusion process for the extraction of beet sugar has led manufacturers to seek adaptation for cane sugar. In such a diffusion process, the ground carmes are suspended in water to carry out the extraction by diffusion, maceration and percolation. Diffusion has a link in large devices according to the conventional exhaustion process, by counter-current, which leads to extraction times and especially large volumes of tanks, therefore to costly and bulky installations, with in addition driving difficulties due in particular to fermentation problems.

On a par la suite repris le procédé conventionnel pour l'améliorer et aboutir au procédé par réimbibition. Ce procédé consiste pour l'essentiel à arroser la canne préparée par du jus extrait, puis à l'écraser à nouveau dans un moulin suivant le premier, le procédé étant poursuivi à l'aide de plusieurs réimbibitions et plusieurs moulins successifs, afin d'améliorer le rendement d'extraction. Le résultat est que l'efficacité d'ensemble de l'équipement se trouve améliorée. Malgré cette amélioration, l'installation complète reste onéreuse, encombrante et grande consommatrice d'énergie, en contrepartie de l'augmentation du rendement d'extraction.The conventional process was subsequently taken up to improve it and lead to the rebimbing process. This process essentially consists of watering the cane prepared with extracted juice, then crushing it again in a mill according to the first, the process being continued using several re-soaking and several successive mills, in order to improve the extraction yield. The result is that the overall efficiency of the equipment is improved. Despite this improvement, the complete installation remains expensive, cumbersome and consumes a great deal of energy, in return for the increase in extraction efficiency.

Ce dernier procédé a fait l'objet de nombreux perfectionnements, dont certains ont mis en lumière le rôle nuisible que joue l'absorption d'air par les cellules qui se dilatent élastiquement immédiatement après avoir été écrasées. En effet, cet air empêche une imbibition efficace par le liquide et consomme inutilement de l'énergie par sa compressibilité. Pour éviter cela, certains des procédés proposés préconisent la désaération des mélanges, ou encore l'arrosage de la bagasse immédiatement à la sortie du moulin, mais sans jamais parvenir complètement à supprimer cette présence d'air.The latter process has been the subject of numerous improvements, some of which have highlighted the harmful role played by the absorb air by the cells which expand elastically immediately after being crushed. Indeed, this air prevents effective imbibition by the liquid and consumes energy unnecessarily by its compressibility. To avoid this, some of the proposed methods recommend deaeration of the mixtures, or even the watering of the bagasse immediately at the outlet of the mill, but never completely succeeding in eliminating this presence of air.

Le but de l'invention est de réaliser un procédé d'extraction de bon rendement et de faible coût qui évite les inconvénients précédents, en particulier qui réduise l'importance des installations et qui mette en oeuvre une puissance plus faible que celle des procédés conventionnels, fussent-ils améliorés, ceci étant obtenu principalement par des passages multiples à basse pression en milieu aqueux évitant donc méthodiquement la reprise d'air.The object of the invention is to provide an extraction process with good efficiency and low cost which avoids the above drawbacks, in particular which reduces the size of the installations and which implements a lower power than that of conventional methods. , even if they were improved, this being mainly obtained by multiple low pressure passages in an aqueous medium thus methodically avoiding air intake.

L'invention consiste à presser les cannes préalablement préparées, puis le magma (préparation et jus) entre plusieurs paires de cylindres cannelés, chaque paire étant complètement immergée dans une cuve et alimentée par une trémie, et ceci en combinant d'une part une recirculation constante du magma, de chaque cuve vers la trémie correspondante, avec un débit important, et d'autre part une circulation à contre-courant de la préparation et du jus avec un débit moindre dans les diverses cuves correspondant aux diverses paires de cylindres.The invention consists in pressing the previously prepared canes, then the magma (preparation and juice) between several pairs of fluted cylinders, each pair being completely immersed in a tank and fed by a hopper, and this by combining recirculation on the one hand constant of the magma, from each tank to the corresponding hopper, with a large flow, and on the other hand a counter-current circulation of the preparation and of the juice with a lower flow in the various tanks corresponding to the various pairs of cylinders.

L'installation pour la mise en oeuvre de ce procédé comprend donc une série de cuves, en nombre réduit, contenant chacune une paire de cylindres cannelés surmontée d'une trémie d'alimentation, avec des moyens pour assurer le recyclage et d'autres moyens pour assurer la circulation à contre-courant de la préparation et du jus.The installation for implementing this process therefore comprises a series of tanks, in reduced number, each containing a pair of fluted cylinders surmounted by a feed hopper, with means for recycling and other means. to ensure the counter-current circulation of the preparation and the juice.

En particulier, la circulation du jus se fait avantageusement par simple débordement d'une cuve à l'autre, les cuves étant placées à des hauteurs étagées, avec des pompes à magma de recirculation élevant le magma d'une cuve vers la trémie correspondante, et des pompes à magma de transfert élevant le magma d'une cuve vers la trémie de la cuve située en amont (ou vers la sortie de bagasse pour la cuve la plus en amont).In particular, the circulation of the juice is advantageously done by simple overflow from one tank to another, the tanks being placed at stepped heights, with recirculating magma pumps raising the magma from a tank to the corresponding hopper, and transfer magma pumps raising the magma from a tank to the hopper of the tank located upstream (or to the bagasse outlet for the most upstream tank).

Pour assurer la méthodicité de ces circulations, les pompes de transfert déversent chacune le magma sur un séparateur à grille courbe, le jus d'égouttage étant ramené vers la cuve d'où provient le magma, tandis que la préparation grossièrement égouttée s'écoule par gravité dans la trémie correspondante ou vers la sortie. En outre, les goulottes de transfert du jus par débordement d'une cuve amont vers une cuve aval sont de préférence équipées également d'une grille courbe constamment balayée par les palettes d'un moulinet rotatif afin de laisser passer le jus mais de ramener constamment la préparation dans la cuve amont.To ensure the methodicity of these circulations, the transfer pumps each pour the magma onto a separator with a curved grid, the dripping juice being brought back to the tank from which the magma comes, while the coarsely drained preparation flows by gravity in the corresponding hopper or towards the exit. In addition, the juice transfer chutes by overflowing from an upstream tank to a downstream tank are preferably also equipped with a curved grid constantly swept by the paddles of a rotary reel in order to let the juice pass but to constantly bring back the preparation in the upstream tank.

D'autres particularités de l'invention apparaîtront dans la description qui va suivre d'un mode de réalisation pris comme exemple et représenté sur le dessin annexé, sur lequel :

  • la figure 1 représente le schéma général du procédé;
  • la figure 2 représente plus en détail une cellule d'extraction;
  • la figure 3 est une coupe verticale selon III-III de la figure 2; et
  • la figure 4 est également une coupe verticale selon IV-IV de la figure 2.
Other features of the invention will appear in the following description of an embodiment taken as an example and shown in the attached drawing, in which:
  • FIG. 1 represents the general diagram of the process;
  • Figure 2 shows in more detail an extraction cell;
  • Figure 3 is a vertical section on III-III of Figure 2; and
  • FIG. 4 is also a vertical section along IV-IV of FIG. 2.

Chaque cellule d'extraction comprend, selon l'invention, une paire de cylindres cannelés 1 et 2 à axes horizontaux, 3 et 4, complètement immergés dans une cuve C. Le cylindre 1 est moteur, et son axe 3, sans débattement, passe à travers les parois de la cuve par des calfats 5, un des bouts de l'arbre 3 étant entraîné par un mécanisme motoréducteur 6 éventuellement à vitesse variable. L'autre rouleau 2 a son axe 4 qui tourillonne dans des paliers 7 situés à l'extrémité des branches 8 sensiblement verticales d'un étrier, partiellement immergé, assurant le débattement horizontal de l'arbre 4 sans nécessiter de traversée de paroi. Cet étrier est constitué, outre les branches verticales 8, par un arbre 9 monté dans des paliers 10 fixés sur la cuve. La mise en pression du cylindre 2 sur le cylindre 1 est assurée par un ou deux vérins latéraux 11 situés en-dehors de la cuve C. Le cylindre 2 à débattement est monté fou, et entraîné directement par le cylindre-moteur 1 par l'intermédiaire de grosses cannelures 12 qui engrènent entre elles.Each extraction cell comprises, according to the invention, a pair of grooved cylinders 1 and 2 with horizontal axes, 3 and 4, completely submerged in a tank C. The cylinder 1 is motor, and its axis 3, without travel, passes through the walls of the tank by caulks 5, one of the ends of the shaft 3 being driven by a gearmotor mechanism 6 optionally at variable speed. The other roller 2 has its axis 4 which spins in bearings 7 located at the end of the substantially vertical branches 8 of a stirrup, partially submerged, ensuring the horizontal movement of the shaft 4 without requiring any wall crossing. This stirrup is made up, in addition to the vertical branches 8, by a shaft 9 mounted in bearings 10 fixed on the tank. The pressurization of the cylinder 2 on the cylinder 1 is ensured by one or two lateral jacks 11 located outside the tank C. The cylinder 2 with travel is mounted idly, and driven directly by the engine cylinder 1 by the intermediate large grooves 12 which mesh with each other.

Au-dessus de cette paire de cylindres 1 et 2 est montée une trémie d'alimentation 13 constituée par deux flasques d'extrémité 14, se raccordant d'une manière quasiment étanche avec les faces d'extrémités des cylindres, et deux parois latérales verticales 15 se raccordant avec la périphérie de ces cylindres. L'étanchéité de ces divers raccordements de la trémie 13 avec la paire de cylindres peut être toute relative, étant donné qu'elle ne sépare que des milieux qui de toutes façons sont remis en circulation permanente avec un fort débit.Above this pair of cylinders 1 and 2 is mounted a feed hopper 13 constituted by two end flanges 14, connecting in an almost sealed manner with the end faces of the cylinders, and two vertical side walls 15 connecting with the periphery of these cylinders. The tightness of these various connections of the hopper 13 with the pair of cylinders can be quite relative, since it only separates media which in any case are put back into permanent circulation with a high flow rate.

Chaque trémie 13 comporte une double alimentation : d'une part, une tuyauterie 16 y déverse du magma et d'autre part, un séparateur 17 à grille courbe 18 y déverse de la préparation grossièrement égouttée, le jus d'égouttage sortant en 19 pour être renvoyé dans la cuve aval.Each hopper 13 has a double feed: on the one hand, a pipe 16 drains magma into it and on the other hand, a separator 17 with a curved grid 18 d pours out of the coarsely drained preparation, the dripping juice leaving in 19 for be returned to the downstream tank.

Chaque cuve C comprend une goulotte de sortie de débordement 20, obturée également par une grille courbe 21 dont la surface est balayée en permanence par les pales 22 d'un moulinet 23 entraîné en rotation dans le sens de la flèche 24 par un motoréducteur 25, ceci de manière à ramener constamment vers la cuve la préparation qui s'accumule contre la grille 21. La cuve C comporte également une goulotte d'entrée 26 pour la cuve C3 la plus en amont, cette goulotte d'entrée étant constituée par la goulotte de sortie 20 de la cuve précédente pour les autres cuves C2, C1. Enfin, la cuve C comporte deux sorties de tuyauterie 27 et 28 pour le magma.Each tank C comprises an overflow outlet chute 20, also closed by a curved grid 21, the surface of which is continuously swept by the blades 22 of a reel 23 driven in rotation in the direction of the arrow 24 by a geared motor 25, this so as to constantly bring back towards the tank the preparation which accumulates against the grid 21. The tank C also comprises an inlet chute 26 for the tank C 3 most upstream, this inlet chute being constituted by the outlet chute 20 of the previous tank for the other tanks C 2 , C 1 . Finally, the tank C has two pipe outlets 27 and 28 for the magma.

Un certain nombre de cellules semblables, trois dans l'exemple choisi, sont montées en cascade, de telle manière que chaque goulotte de sortie 20 se raccorde avec l'entrée 26 de la cuve suivante, comme représenté plus particulièrement sur la figure 1. En outre, l'installation se complète par une série de pompes destinées à assurer la circulation systématique.A number of similar cells, three in the example chosen, are cascaded in such a way that each outlet chute 20 is connected to the inlet 26 of the next tank, as shown more particularly in FIG. 1. In in addition, the installation is completed by a series of pumps intended to ensure systematic circulation.

On a en particulier trois pompes de recirculation, R1, R2 et R3, associées respectivement aux trois cuves C1, C2 et C3, et qui sont des pompes à magma aspirant le magma dans la sortie 27 de chaque cuve et le refoulant dans l'alimentation 16 de la trémie 13 correspondante. On a d'autre part trois pompes de transfert T1, T2 et T3 qui sont également des pompes à magma raccordées sur la sortie 28 de la cuve correspondante et qui déversent le magma en 29, au-dessus du séparateur à grille courbe 17 de la cuve amont pour T1 et T20 ou en 30 au-dessus d'un dernier séparateur à grille courbe 17 alimentant la sortie de bagasse 31. Les sorties de jus 19 des divers séparateurs 17 déversent le jus dans la cuve aval, c'est-à-dire la cuve d'où provient le magma pompé, ceci par simple écoulement naturel, ou à l'aide d'une pompe 32 si nécessaire.There are in particular three recirculation pumps, R 1 , R 2 and R 3 , associated respectively with the three tanks C 1 , C 2 and C 3 , and which are magma pumps sucking the magma in the outlet 27 of each tank and pushing it back into the feed 16 of the corresponding hopper 13. We also have three transfer pumps T 1 , T 2 and T 3 which are also magma pumps connected to the outlet 28 of the corresponding tank and which discharge the magma at 29, above the curved grid separator 17 of the upstream tank for T 1 and T 20 or at 30 above a last separator with a curved grid 17 supplying the bagasse outlet 31. The juice outlets 19 of the various separators 17 pour the juice into the downstream tank, that is to say the tank from which the magma pumped comes, this by simple natural flow, or using a pump 32 if necessary.

Les cannes préparées sont alimentées en 33 dans la trémie de la cuve aval. Elles sont pressées par la première paire de cylindres et recyclées plusieurs fois par entraînement positif grâce à la recirculation systématique. Naturellement, la vitesse des cylindres est ajustée en fonction tout à la fois du débit de cannes arrivant en 33 et du débit de recirculation arrivant en 16, et la pompe de recirculation de chaque cuve est réglée pour assurer ce débit avec un léger excédent qui s'écoule par le déversoir 34 que comporte chaque trémie 13. Conformément à l'invention, les divers paramètres sont déterminés pour que le débit de recyclage soit très supérieur au débit de produit principal, par exemple cinq fois ce débit. Chaque cellule opère donc en principe cinq pressages-réimbibitions, ce qui augmente considérablement l'efficacité de l'installation et permet en particulier d'obtenir de bons rendements d'extraction avec un nombre réduit de cellules d'extraction, par exemple trois dans l'exemple représenté.The prepared canes are fed at 33 into the hopper of the downstream tank. They are pressed by the first pair of cylinders and recycled several times by positive drive thanks to systematic recirculation. Naturally, the speed of the cylinders is adjusted as a function of both the flow of rods arriving at 33 and the recirculation flow arriving at 16, and the recirculation pump of each tank is adjusted to ensure this flow with a slight excess which s 'flows through the weir 34 that each hopper 13 comprises. According to the invention, the various parameters are determined so that the recycling rate is much higher than the rate of main product, for example five times this rate. Each cell therefore operates in principle five press-rebimbitions, which considerably increases the efficiency of the installation and in particular makes it possible to obtain good extraction yields with a reduced number of extraction cells, for example three in 1 example shown.

A côté de cette recirculation systématique a lieu également une extraction par épuisement méthodique grâce à la circulation à contre-courant de la préparation et du jus.Besides this systematic recirculation, extraction by methodical exhaustion also takes place thanks to the countercurrent circulation of the preparation and the juice.

En effet, si l'on suit le trajet de la préparation, depuis l'entrée des cannes en 33, celle-ci après plusieurs circulations dans la cuve C est envoyée par la pompe de transfert T1 et par le séparateur 17 correspondant vers la cuve C2, où elle subit à nouveau cinq pressages-réimbibitions dans un jus moins concentré, puis elle est envoyée de la même façon par la pompe de transfert T2 dans la cuve C3 où elle subit à nouveau cinq pressages-réimbibitions dans un jus encore moins concentré, avant d'être reprise par la pompe de transfert T3 et envoyée vers la sortie de bagasse 31, où elle est reprise dans des presses habituelles pour séparer la bagasse complètement épuisée du jus faiblement concentré qui est envoyé en 35 dans la cuve amont C3' Cette cuve C reçoit également le jus récupéré en 19 du dernier séparateur 17 et qui est envoyé en 26, en même temps qu'une alimentation en eau pure 36 pour compléter les pertes. On a vu en particulier que les grilles 21 et les moulinets 23 empêchent l'entraînement en sens inverse de la bagasse.Indeed, if we follow the route of the preparation, from the entry of the rods at 33, this after several circulations in the tank C is sent by the transfer pump T 1 and by the corresponding separator 17 to the tank C 2 , where it again undergoes five pressing-rebounds in a less concentrated juice, then it is sent in the same way by the transfer pump T 2 in tank C 3 where it again undergoes five pressing-rebounds in a even less concentrated juice, before being taken up by the trans pump fert T 3 and sent to the bagasse outlet 31, where it is taken up in usual presses to separate the completely exhausted bagasse from the weakly concentrated juice which is sent at 35 to the upstream tank C 3 ' This tank C also receives the recovered juice in 19 of the last separator 17 and which is sent in 26, at the same time as a supply of pure water 36 to supplement the losses. We have seen in particular that the grids 21 and the reels 23 prevent the bagasse from being driven in the opposite direction.

Inversement, le jus circule en sens inverse en partant des produits faiblement concentrés provenant du mélange du jus récupéré en 26, de l'eau de presse renvoyée en 35 et de l'eau pure envoyée en 36, ce mélange étant enrichi en sucre dans la cuve C3 et circulant d'amont en aval avec une concentration progressivement croissante, pour sortir en 37 à sa concentration maximale d'ou il est ensuite purifié et séparé par les moyens habituels.Conversely, the juice circulates in the opposite direction, starting from weakly concentrated products originating from the mixture of the juice recovered at 26, press water returned to 35 and pure water sent to 36, this mixture being enriched with sugar in the tank C 3 and circulating from upstream to downstream with a progressively increasing concentration, to exit at 37 at its maximum concentration from where it is then purified and separated by the usual means.

C'est grâce à cette circulation méthodique combinée avec la recirculation à taux élevé que l'invention permet d'obtenir de bons rendements d'extraction avec un petit nombre de cellules, donc avec une installation économique et peu encombrante. Par ailleurs, étant donné que les cylindres fonctionnent en milieu complètement immergé, on évite complètement les inconvénients dus à l'introduction d'air dans les cellules et l'on peut opérer avec des pressions de cylindres relativement modérées et une énergie d'entraînement des cylindres également modérée. Enfin, l'installation complète est d'une fabrication simple et d'une conduite facile.It is thanks to this methodical circulation combined with recirculation at a high rate that the invention makes it possible to obtain good extraction yields with a small number of cells, therefore with an economical and space-saving installation. Furthermore, since the cylinders operate in a completely submerged environment, the drawbacks due to the introduction of air into the cells are completely avoided and it is possible to operate with relatively moderate cylinder pressures and drive energy of the cylinders. cylinders also moderate. Finally, the complete installation is simple to manufacture and easy to operate.

Claims (5)

1. Procédé d'extraction de sucre de canne par passage de la préparation et du magma entre plusieurs paires de cylindres cannelés, caractérisé par le fait que chaque paire de cylindres est complètement immergée dans une cuve (C) et alimentée par une trémie (13), et que l'on combine d'une part une reairculation constante du magma, de chaque cuve vers la trémie correspondante, avec un débit important, et d'autre part une circulation à contre-courant de la préparation et du jus avec un débit moindre dans les diverses cuves (C1, C2, C3) correspondant aux diverses paires de cylindres.1. Method for extracting cane sugar by passing the preparation and the magma between several pairs of fluted cylinders, characterized in that each pair of cylinders is completely submerged in a tank (C) and fed by a hopper (13 ), and that we combine on the one hand a constant re-circulation of the magma, from each tank to the corresponding hopper, with a high flow rate, and on the other hand a counter-current circulation of the preparation and the juice with a lower flow in the various tanks (C 1 , C 2 , C 3 ) corresponding to the various pairs of cylinders. 2. Installation pour la mise en oeuvre du procédé selon la revendication 1, caractérisée par le fait qu'elle comporte un petit nombre de cellules d'extraction, chaque cellule comprenant une paire de cylindres cannelés (1,2) surmontée d'une trémie (13) et complètement immergée dans une cuve (C), ainsi qu'une pompe de recirculation (R1, R2, R3) prélevant le magma dans la cuve de la cellule et le déversant dans la trémie (13) de cette même cellule, et une pompe de transfert (T1, T2, T3) prélevant le magma dans la cuve de la cellule et le déversant dans la trémie de la cellule amont, ou vers la sortie de bagasse (31) pour la cellule (C3) la plus en amont, les diverses cuves (C1, C2, C3) étant placées en cascade pour permettre l'écoulement du jus de l'amont vers l'aval.2. Installation for implementing the method according to claim 1, characterized in that it comprises a small number of extraction cells, each cell comprising a pair of grooved cylinders (1,2) surmounted by a hopper (13) and completely submerged in a tank (C), as well as a recirculation pump (R 1 , R 2 , R 3 ) taking the magma from the cell tank and discharging it into the hopper (13) of this same cell, and a transfer pump (T 1 , T 2 , T 3 ) taking the magma in the cell of the cell and pouring it into the hopper of the upstream cell, or towards the bagasse outlet (31) for the cell (C 3 ) most upstream, the various tanks (C 1 , C 2 , C3) being placed in cascade to allow the flow of the juice from upstream to downstream. 3. Installation selon la revendication 2, caractérisée par le fait que chaque déversement de magma (29), depuis la pompe de transfert correspondante, se fait par l'intermédiaire d'un séparateur (17) à grille courbe, le jus d'égouttage (19) ainsi extrait étant ramené dans la cuve de la cellule d'où provient le magma.3. Installation according to claim 2, characterized in that each spill of magma (29), from the corresponding transfer pump, is done via a separator (17) with a curved grid, the dripping juice (19) thus extracted being brought back into the cell of the cell from which the magma comes. 4. Installation selon une des revendications 2 et 3, caractérisée par le fait que l'écoulement du jus par débordement de chaque cuve vers la cuve située en aval, ou vers la sortie de jus (37) pour la cuve la plus en aval (C1), se fait par une goulotte (20) obturée transversalement par une grille courbe (21) dont la surface est balayée par des palettes (22) d'un moulinet (23) tournant dans un sens tel qu'il ramène constamment vers la cuve amont la bagasse accumulée contre cette grille.4. Installation according to one of claims 2 and 3, characterized in that the flow of the juice by overflowing from each tank to the tank located downstream, or to the juice outlet (37) for the most downstream tank ( C 1 ), is done by a chute (20) closed transversely by a curved grid (21) whose surface is swept by paddles (22) of a reel (23) rotating in a direction such that it constantly brings back towards the upstream tank the bagasse accumulated against this grid. 5. Installation selon une des revendications 2 à 4, caractérisée par le fait que chaque paire de cylindres (1, 2) comprend un cylindre moteur (1) sans débattement dont l'arbre d'entraînement (3) traverse les parois de la cuve (C) à travers des calfats (5), l'autre cylindre (2) étant fou et entraîné par le précédent grâce à des cannelures (12) d'assez grande hauteur, l'arbre (4) de ce cylindre fou (2) étant suspendu au dessous d'un étrier (8-9) dont les branches sont immergées et qui est articulé à la partie supérieure de la cuve et mis en pression par un ou plusieurs vérins (11) situés hors de la cuve.5. Installation according to one of claims 2 to 4, characterized in that each pair of cylinders (1, 2) comprises an engine cylinder (1) without movement whose drive shaft (3) passes through the walls of the tank (C) through caulks (5), the other cylinder (2) being crazy and driven by the previous one by means of grooves (12) of relatively great height, the shaft (4) of this crazy cylinder (2 ) being suspended below a stirrup (8-9) whose branches are immersed and which is articulated at the top of the tank and pressurized by one or more cylinders (11) located outside the tank.
EP86112893A 1985-09-18 1986-09-18 Process and apparatus for extracting sugar from sugar cane Expired EP0217238B1 (en)

Priority Applications (1)

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AT86112893T ATE45186T1 (en) 1985-09-18 1986-09-18 METHOD AND DEVICE FOR EXTRACTING SUGAR FROM SUGAR CANE.

Applications Claiming Priority (2)

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FR8513843A FR2587363B1 (en) 1985-09-18 1985-09-18 PROCESS AND PLANT FOR THE EXTRACTION OF SUGAR FROM THE SUGAR CANE
FR8513843 1985-09-19

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EP0217238A1 true EP0217238A1 (en) 1987-04-08
EP0217238B1 EP0217238B1 (en) 1989-08-02

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AT (1) ATE45186T1 (en)
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Publication number Priority date Publication date Assignee Title
MX166939B (en) * 1989-04-21 1993-02-15 Biotecnologia Y Derivados De M IMPROVED LOW PRESSURE SYSTEM FOR THE EXTRACTION OF FIBROUS MATTER SOLUBLES
US5358571A (en) * 1993-05-27 1994-10-25 Villavicencio Eduardo J Enhanced sugar recovery
US6245153B1 (en) 1999-08-28 2001-06-12 Hoy Products, Inc. Method for producing sugar cane juice

Citations (2)

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FR2050660A5 (en) * 1969-06-20 1971-04-02 Fives Lille Cail Sugar extraction from sugar cane
FR2198995A1 (en) * 1972-09-13 1974-04-05 Neuville Paul Extraction of sugar from crushed pulverized cane - by diffusion and leaching with liquid flowing down through floating beds compressed by immersion

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FR2050660A5 (en) * 1969-06-20 1971-04-02 Fives Lille Cail Sugar extraction from sugar cane
FR2198995A1 (en) * 1972-09-13 1974-04-05 Neuville Paul Extraction of sugar from crushed pulverized cane - by diffusion and leaching with liquid flowing down through floating beds compressed by immersion

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Title
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EP0217238B1 (en) 1989-08-02
FR2587363B1 (en) 1988-01-08
ATE45186T1 (en) 1989-08-15
FR2587363A1 (en) 1987-03-20
DE3664786D1 (en) 1989-09-07
US4804418A (en) 1989-02-14

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