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EP0343023B1 - Pulper for papermaking pulp - Google Patents

Pulper for papermaking pulp Download PDF

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Publication number
EP0343023B1
EP0343023B1 EP89401001A EP89401001A EP0343023B1 EP 0343023 B1 EP0343023 B1 EP 0343023B1 EP 89401001 A EP89401001 A EP 89401001A EP 89401001 A EP89401001 A EP 89401001A EP 0343023 B1 EP0343023 B1 EP 0343023B1
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EP
European Patent Office
Prior art keywords
pulper
papermaking pulp
wall
pulp according
vessel
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
EP89401001A
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German (de)
French (fr)
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EP0343023A1 (en
Inventor
Jean-Pierre Lamort
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.)
Kadant Lamort SAS
Original Assignee
E&M Lamort Fils SA
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Publication date
Application filed by E&M Lamort Fils SA filed Critical E&M Lamort Fils SA
Publication of EP0343023A1 publication Critical patent/EP0343023A1/en
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Publication of EP0343023B1 publication Critical patent/EP0343023B1/en
Anticipated expiration legal-status Critical
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers

Definitions

  • the present invention relates to a pulp disintegration device and in particular to a pulper for paper pulp.
  • the disintegration of the paper consists in transforming the paper from the dry and solid state to the pasty state in the presence of water.
  • the shredder pulpers have a rotor at the bottom of a tank and knives placed either on the bottom and side walls or on the rotor itself, these arrangements being combined with each other to obtain the best efficiency.
  • the paper is cut into small fragments as well as the foreign bodies which must be eliminated in the following treatments, for purifying the pulp.
  • the disintegrating pulpers generally comprise a vertical rotor located at the bottom of the tank, formed by a booster screw ending in a centrifugal turbine driving the paper in a violent movement, and this paper disintegrates by fiber-to-fiber friction.
  • the paper is not shredded and the impurities remain intact, thus leaving, for example, plastic sheets in the mass of the pulp.
  • impurities are sorted in additional devices described in patents FR-A 2,461,681 and FR-A 2,543,183.
  • US-A 3 506 202 describes a shredder pulper whose internal surface of the tank is provided with elements arranged so as to lift the dough and thus accelerate the return to the center of the tank.
  • European patent No. EP-A 0 122 991 describes a solution to this problem: the wall of material is divided, which tends to rise along the wall of the pulper, and the material is redirected towards the center of the container.
  • the organs which deflect and divide the wall of material consist of three deflectors or studs 100 of pyramidal shape, arranged on the wall of the pulper. Each stud has four generally triangular faces, the two lower faces forming deflectors.
  • the pyramids are symmetrical, and arranged in such a way that the lower faces are symmetrically inclined downwards by a same angle, one to the left, the other to the right, so that the wall of material rising along the wall divides on these two faces into two parts.
  • This device if it prevents the material from remaining attached to the wall of the pulper and the rotor from rotating in a vacuum, has the disadvantage of not stirring all the material regularly. Indeed, by dividing the flow into three flow bundles 101, the part of the material which is not deflected 102 remains attached to the wall while the rest is recirculated, as shown in FIG. 1. The material present in these areas of least agitation is therefore less well treated than the rest which gives a heterogeneous result to the disintegration.
  • the present invention aims to improve pulpers, whether or not of the helical type, making it possible to process a much denser mass of paper, up to 25% of dry matter, ie a 25% increase in current performance. , by forced recirculation of the dough.
  • the invention relates to an improved device for forced recirculation of high concentration material contained in the disintegrating pulper, more precisely it relates to a pulp pulp of the type comprising a cylindrical tank, open at its upper part, and a rotor in the bottom surmounted by a vertical shaft extending along the central axis of revolution of the tank in the interior of the tank, the side wall of the tank comprising a device for recirculating the dough, characterized in that the recirculation device comprises at least one surface element developing substantially circularly along the wall of the pulper, extending from the wall towards the inside of the tank and towards the upper opening of the pulper over a constant distance so to form a band of constant width, determining an oblique plane whose lower face looks downwards so that the dough meeting this force is diverted into the interior of the tank.
  • the pulper illustrated in the drawing is of the helical type described in patent FR-A 2,544,756 but this example of embodiment is not limiting and the invention relates to any type of pulper.
  • the pulper comprises a cylindrical tank 1 open at its upper part, with a central axis of revolution 2, provided in its bottom with a rotor 3, itself carrying a shaft 4 which extends towards the upper opening along the axis 2 of the pulper.
  • the shaft 4 carries helical discs 5 which, with the rotation of the rotor, impart to the suspended material 6 a vertical movement from top to bottom, the material being, at the bottom of the shaft, projected towards the side wall and then going up along the wall.
  • a forced recirculation device 7 intended to deflect the ascending current of the material along the wall and to orient it towards the upper end of the shaft 4.
  • this forced recirculation device comprises at least one surface element 8,21 developing substantially circularly along the wall 9 of the pulper, extending from the wall 9 towards the inside of the tank 1 and towards the upper opening 20 ⁇ of the pulper over a constant distance 12.22 so as to form a strip of constant width 12, one of the faces 8a, 24 of the element being oriented towards the bottom of the tank so that all of the material 6 meeting this face 8a, 24 is diverted and folded into the interior of the tank.
  • the forced recirculation device 7 comprises a closed circular crown 8, that is to say which forms a ring; it extends from the wall 9 towards the axis 2 of the tank, at an angle 10 ⁇ with the wall 9 of the tank; the surface formed by this inclined crown 8 produces a truncated cone, the top of which is on the side of the upper opening 20 ⁇ of the tank 1.
  • the angle 10 ⁇ of inclination of this ring 8 with the wall is between 10 ⁇ ° and 60 ⁇ ° and in the embodiment the angle chosen is 45 °.
  • the recirculation device is an angle iron having two wings 8a, 11 forming between them a right angle. This angle is bent into a circle of the same outside diameter as the inside diameter of the tank, and the ends of the two wings of the angle are assembled on the side wall 9 by any known means, for example, by welding.
  • the wing 8a has the function of a deflection ring.
  • the crown is mounted perpendicular to the axis 2 of the tank: the distance from the end of the shaft 4 to the lower end of the crown (or to the upper end) is constant.
  • the width 12 of the crown is between 10 ⁇ 0 ⁇ and 50 ⁇ 0 ⁇ millimeters.
  • the distance 13 between the upper end of the shaft 4 and the plane 14 defined by the upper end circle of the crown 8 varies between 0 ⁇ and 50 ⁇ 0 ⁇ millimeters.
  • each crown section, or element 21 is inclined upwards in the direction of rotation of the rotor.
  • the forced recirculation device comprises at least one surface element 21 which extends in a helix along the wall 9 of the pulper.
  • the crown 8 can be sectioned and bent helically, the ends then no longer being contiguous.
  • the element extends over 360 ⁇ ° at most. This variant destroys the isotropy of the deflection and is sufficient to avoid the formation of a vault.
  • the elements consist of a metal strip of constant width 22 which, according to the invention, extends from the wall towards the upper opening 20 ⁇ , making, on the one hand an angle 10 ⁇ with the vertical, on the other leaves an angle 23 with the horizontal.
  • This surface element runs along the cylindrical wall of the pulper, forming a deflection surface helical, one of the faces 24 of which is oriented towards the bottom of the tank; the dough that meets this surface element is deflected and diverted into the tank but in a direction between the axis 2 and the wall, as shown in Figure 5.
  • the surface elements are made, either from an angle iron, or from a profiled metal strip.
  • the ends of each element 25 are closed with a corresponding triangular metallic element.
  • the number of elements 21 and their length are variable: they can succeed each other leaving an empty gap between them (as illustrated in Figure 3) or partially overlap ( Figure 4) so as to ensure the recirculation of the all of the material.
  • the angle 10 ⁇ of inclination of the surface element 21, like that of the crown 8, with the wall 9, is between 10 ⁇ ° and 60 ⁇ °, and preferably the angle is of the order of 35 ° at 45 °.
  • the angle of inclination 23 of the longitudinal direction of the propeller with the plane perpendicular to the axis of the pulper is between approximately 10 and 30 °, and preference is around 15 °.
  • the invention makes it possible to reduce the total processing time for an overall mass of paper (produced by a succession of treatments of identical batches of material) for an unchanged energy consumption: either by reducing the duration of each treatment at constant initial density, either by increasing the density and therefore by reducing the number of batches to be treated.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Description

La présente invention se rapporte à un dispositif de désintégration de pâte à papier et notamment à un pulpeur pour pâte à papier.The present invention relates to a pulp disintegration device and in particular to a pulper for paper pulp.

La désintégration du papier consiste à transformer le papier de l'état sec et solide à l'état pâteux en présence d'eau.The disintegration of the paper consists in transforming the paper from the dry and solid state to the pasty state in the presence of water.

Deux techniques sont couramment utilisées : la technique des pulpeurs déchiqueteurs et la technique des pulpeurs désintégrateurs.Two techniques are commonly used: the shredder pulper technique and the disintegrator pulper technique.

Les pulpeurs déchiqueteurs comportent en rotor au fond d'une cuve et des couteaux placés soit sur les parois de fond et latérale, soit sur le rotor lui-même, ces dispositions étant combinées entre elles pour obtenir la meilleure efficacité. Dans cette technique le papier est découpé en petits fragments ainsi que les corps étrangers qu'il faut éliminer dans les traitements suivants, d'épuration de la pâte.The shredder pulpers have a rotor at the bottom of a tank and knives placed either on the bottom and side walls or on the rotor itself, these arrangements being combined with each other to obtain the best efficiency. In this technique the paper is cut into small fragments as well as the foreign bodies which must be eliminated in the following treatments, for purifying the pulp.

Les pulpeurs désintégrateurs, plus connus sous le nom de "hélico" comportent généralement un rotor vertical situé au fond de la cuve, formé par une vis de gavage se terminant en une turbine centrifuge entraînant le papier dans un mouvement violent, et ce papier se désintègre par friction fibres contre fibres.The disintegrating pulpers, better known under the name of "helicopter" generally comprise a vertical rotor located at the bottom of the tank, formed by a booster screw ending in a centrifugal turbine driving the paper in a violent movement, and this paper disintegrates by fiber-to-fiber friction.

Un tel pulpeur est décrit au brevet FR-A-2 544.756 de la demanderesse.Such a pulper is described in patent FR-A-2,544,756 of the applicant.

Dans cette technique, le papier n'est pas déchiqueté et les impuretés restent entières, laissant ainsi, par exemple, des feuilles de plastique dans la masse de la pâte. Ces impuretés sont triées dans des dispositifs annexes décrits aux brevets FR-A 2 461.681 et FR-A 2 543.183.In this technique, the paper is not shredded and the impurities remain intact, thus leaving, for example, plastic sheets in the mass of the pulp. These impurities are sorted in additional devices described in patents FR-A 2,461,681 and FR-A 2,543,183.

Cette technique donne de bons résultats et notamment le pulpeur décrit au brevet précité permet de désintégrer un mélange de papiers ayant une densité allant de 15 à 20% de matières séchées.This technique gives good results and in particular the pulper described in the aforementioned patent makes it possible to disintegrate a mixture of papers having a density ranging from 15 to 20% of dried matter.

Mais il est pratiquement impossible d'augmenter la densité, c'est-à-dire de traiter plus de papier à la fois car, si l'on ajoute une plus grande quantité de papier (pour une même quantité d'eau), il est nécessaire d'augmenter la puissance du moteur pour éviter le bourrage et pour traiter la masse dans un temps comparable, ou bien s'il n'y a pas de bourrage, il faut considérablement augmenter le temps de traitement si bien que finalement le gain est insensible s'il existe.But it is practically impossible to increase the density, that is to say to process more paper at the same time because, if we add a larger amount of paper (for the same amount of water), it it is necessary to increase the power of the motor to avoid the blockage and to treat the mass in a comparable time, or else if there is no blockage, the treatment time must be considerably increased so that ultimately the gain is insensitive if it exists.

D'autre part, la matière remontant le long de la paroi sans retomber au centre, le rotor tourne dans le vide ; et en se décrochant de la paroi elle provoque des à-coups qui endommagent le moteur.On the other hand, the material going up along the wall without falling in the center, the rotor turns in a vacuum; and when it comes off the wall it causes jolts which damage the motor.

En conséquence, aussi bien pour des raisons économiques que pour des difficultés de fonctionnement on ne peut dépasser la densité de 20% de matières sèches.Consequently, both for economic reasons and for operational difficulties, the density of 20% dry matter cannot be exceeded.

Le brevet US-A 3 506 202 décrit un pulpeur déchiqueteur dont la surface interne de la cuve est pourvue d'éléments agencés de manière à soulever la pâte et ainsi accélérer le retour vers le centre de la cuve.US-A 3 506 202 describes a shredder pulper whose internal surface of the tank is provided with elements arranged so as to lift the dough and thus accelerate the return to the center of the tank.

Le brevet européen n° EP-A 0 122 991 décrit une solution à ce problème : on divise le mur de matière qui a tendance à s'élever le long de la paroi du pulpeur et on redirige la matière vers le centre du récipient. Les organes qui dévient et divisent le mur de matière sont constitués de trois déflecteurs ou plots 100 de forme pyramidale, disposés sur la paroi du pulpeur. Chaque plot présente quatre faces de forme générales triangulaires, les deux faces inférieures formant déflecteurs. Les pyramides sont symétriques, et disposées de telle sorte que les faces inférieures sont symétriquement inclinées vers le bas d'un même angle, l'une vers la gauche, l'autre vers la droite, de telle sorte que le mur de matière en s'élevant le long de la paroi se divise sur ces deux faces en deux parties.European patent No. EP-A 0 122 991 describes a solution to this problem: the wall of material is divided, which tends to rise along the wall of the pulper, and the material is redirected towards the center of the container. The organs which deflect and divide the wall of material consist of three deflectors or studs 100 of pyramidal shape, arranged on the wall of the pulper. Each stud has four generally triangular faces, the two lower faces forming deflectors. The pyramids are symmetrical, and arranged in such a way that the lower faces are symmetrically inclined downwards by a same angle, one to the left, the other to the right, so that the wall of material rising along the wall divides on these two faces into two parts.

Ce dispositif, s'il évite à la matière de rester accrochée à la paroi du pulpeur et au rotor de tourner dans le vide, présente cependant l'inconvénient de ne pas brasser régulièrement toute la matière. En effet, en divisant l'écoulement en trois faisceaux 101 d'écoulement, la partie de la matière qui n'est pas défléchie 102 reste accrochée à la paroi pendant que le reste est recirculé, comme cela est montré à la figure 1. La matière présente dans ces zones de moindre agitation est donc moins bien traitée que le restant ce qui donne un résultat hétérogène à la désintégration.This device, if it prevents the material from remaining attached to the wall of the pulper and the rotor from rotating in a vacuum, has the disadvantage of not stirring all the material regularly. Indeed, by dividing the flow into three flow bundles 101, the part of the material which is not deflected 102 remains attached to the wall while the rest is recirculated, as shown in FIG. 1. The material present in these areas of least agitation is therefore less well treated than the rest which gives a heterogeneous result to the disintegration.

La présente invention a pour objectif un perfectionnement aux pulpeurs, qu'ils soient ou non du type hélico, permettant de traiter une masse de papier beaucoup plus dense, jusqu'à 25% de matières sèches, soit une augmentation de 25% des performances actuelles, par recirculation forcée de la pâte.The present invention aims to improve pulpers, whether or not of the helical type, making it possible to process a much denser mass of paper, up to 25% of dry matter, ie a 25% increase in current performance. , by forced recirculation of the dough.

L'invention a pour objet un dispositif amélioré de recirculation forcée de matière à haute concentration contenue dans le pulpeur désintégrateur, plus précisément elle a pour objet un pulpeur de pâte à papier du type comportant une cuve cylindrique, ouverte à sa partie supérieure, et un rotor dans le fond surmonté d'un arbre vertical s'étendant selon l'axe central de révolution de la cuve dans l'intérieur de la cuve, la paroi latérale de la cuve comportant un dispositif de recirculation de la pâte, caractérisé en ce que le dispositif de recirculation comporte au moins un élément de surface se développant substantiellement circulairement le long de la paroi du pulpeur, s'étendant depuis la paroi vers l'intérieur de la cuve et vers l'ouverture supérieure du pulpeur sur une distance constante de manière à former une bande de largeur constante, déterminant un plan oblique dont la face inférieure regarde vers le bas de telle sorte que la pâte rencontrant cette force soit détournée dans l'intérieur de la cuve.The invention relates to an improved device for forced recirculation of high concentration material contained in the disintegrating pulper, more precisely it relates to a pulp pulp of the type comprising a cylindrical tank, open at its upper part, and a rotor in the bottom surmounted by a vertical shaft extending along the central axis of revolution of the tank in the interior of the tank, the side wall of the tank comprising a device for recirculating the dough, characterized in that the recirculation device comprises at least one surface element developing substantially circularly along the wall of the pulper, extending from the wall towards the inside of the tank and towards the upper opening of the pulper over a constant distance so to form a band of constant width, determining an oblique plane whose lower face looks downwards so that the dough meeting this force is diverted into the interior of the tank.

L'invention est encore remarquable par les caractéristiques suivantes :

  • l'élément de surface est une couronne circulaire fermée formant un tronc de cône s'étendant depuis la paroi vers l'axe de la cuve, inclinée par rapport à la paroi de manière à former un tronc de cône dont le sommet se trouve du côté de l'ouverture supérieure du pulpeur;
  • le dispositif de recirculation comporte au moins un élément de surface qui s'étend en hélice le long de la paroi du pulpeur, sur au plus 360°;
  • le dispositif de recirculation comporte une pluralité d'éléments de surface qui s'étendent en hélice le long de la paroi du pulpeur, les éléments étant disposés en couronne autour de l'axe du pulpeur et formant des aubes fixes par rapport au rotor;
  • les éléments de surface s'étendent et sont disposés circulairement de distance en distance sans espacement de telle sorte que leur projection verticale forme une couronne s'étendant sur 360°;
  • les éléments de surface s'étendent en se recouvrant partiellement les uns les autres;
  • l'angle d'inclinaison de l'élément de surface, par rapport à la paroi verticale du pulpeur est compris entre 10° et 60°, et de préférence l'angle est de l'ordre de 35 à 45°;
  • l'angle d'inclinaison de l'axe longitudinal de l'hélice par rapport au plan perpendiculaire à l'axe du pulpeur est compris entre environ 10̸ et 30̸°, de préférence de l'ordre de 15°.
The invention is also remarkable for the following characteristics:
  • the surface element is a closed circular crown forming a truncated cone extending from the wall towards the axis of the tank, inclined relative to the wall so as to form a truncated cone whose apex is on the side the upper opening of the pulper;
  • the recirculation device comprises at least one surface element which extends in a helix along the wall of the pulper, over at most 360 °;
  • the recirculation device comprises a plurality of surface elements which extend in a helix along the wall of the pulper, the elements being arranged in a ring around the axis of the pulper and forming vanes fixed relative to the rotor;
  • the surface elements extend and are arranged circularly from distance to distance without spacing so that their vertical projection forms a crown extending over 360 °;
  • the surface elements extend by partially overlapping each other;
  • the angle of inclination of the surface element, relative to the vertical wall of the pulper is between 10 ° and 60 °, and preferably the angle is of the order of 35 to 45 °;
  • the angle of inclination of the longitudinal axis of the propeller relative to the plane perpendicular to the axis of the pulper is between about 10̸ and 30̸ °, preferably of the order of 15 °.

Afin de mieux comprendre l'invention on a représenté aux dessins annexés un exemple de réalisation du dispositif de recirculation forcée de matière dans lequel :

  • la figure 1 représente une vue de dessus d'un pulpeur muni du dispositif antérieur, en fonctionnement;
  • la figure 2 représente une vue en coupe verticale d'un pulpeur muni du dispositif de recirculation forcée selon l'invention dans une variante de réalisation;
  • la figure 3 représente une vue en coupe verticale du pulpeur de la figure 2 muni du dispositif selon l'invention dans une seconde variante de réalisation;
  • la figure 4 représente une vue en perspective d'un élément du dispositif de recirculation forcée selon l'invention;
  • la figure 5 représente une vue schématique de dessus d'un pulpeur muni du dispositif selon l'invention dans la variante de la figure 3, en fonctionnement.
In order to better understand the invention, there is shown in the accompanying drawings an embodiment of the device for forced recirculation of material in which:
  • FIG. 1 represents a top view of a pulper provided with the prior device, in operation;
  • 2 shows a vertical sectional view of a pulper provided with the forced recirculation device according to the invention in an alternative embodiment;
  • 3 shows a vertical sectional view of the pulper of Figure 2 provided with the device according to the invention in a second alternative embodiment;
  • FIG. 4 represents a perspective view of an element of the forced recirculation device according to the invention;
  • 5 shows a schematic top view of a pulper provided with the device according to the invention in the variant of Figure 3, in operation.

Le pulpeur illustré sur le dessin est du type hélico décrit au brevet FR-A 2 544.756 mais cet exemple de réalisation n'est pas limitatif et l'invention porte sur tout type de pulpeur.The pulper illustrated in the drawing is of the helical type described in patent FR-A 2,544,756 but this example of embodiment is not limiting and the invention relates to any type of pulper.

Le pulpeur comporte une cuve 1 cylindrique ouverte à sa partie supérieure, d'axe central de révolution 2, munie dans son fond d'un rotor 3, portant lui-même un arbre 4 qui s'étend vers l'ouverture supérieure selon l'axe 2 du pulpeur.The pulper comprises a cylindrical tank 1 open at its upper part, with a central axis of revolution 2, provided in its bottom with a rotor 3, itself carrying a shaft 4 which extends towards the upper opening along the axis 2 of the pulper.

Dans l'exemple, l'arbre 4 porte des disques hélicoïdaux 5 qui, avec la rotation du rotor, impriment à la matière 6 en suspension un mouvement vertical de haut en bas, la matière étant, au bas de l'arbre, projetée vers la paroi latérale et remontant ensuite le long de la paroi.In the example, the shaft 4 carries helical discs 5 which, with the rotation of the rotor, impart to the suspended material 6 a vertical movement from top to bottom, the material being, at the bottom of the shaft, projected towards the side wall and then going up along the wall.

On dispose sur la paroi 9 un dispositif de recirculation forcée 7 destiné à dévier le courant ascendant de la matière le long de la paroi et à l'orienter vers l'extrémité supérieure de l'arbre 4.On the wall 9 there is a forced recirculation device 7 intended to deflect the ascending current of the material along the wall and to orient it towards the upper end of the shaft 4.

Selon l'invention, ce dispositif de recirculation forcée comporte au moins un élément de surface 8,21 se développant substantiellement circulairement le long de la paroi 9 du pulpeur, s'étendant depuis la paroi 9 vers l'intérieur de la cuve 1 et vers l'ouverture supérieure 20̸ du pulpeur sur une distance 12,22 constante de manière à former une bande de largeur 12 constante, une des faces 8a,24 de l'élément étant orienté vers le bas de la cuve de telle sorte que la totalité de la matière 6 rencontrant cette face 8a,24 soit détournée et rabattue dans l'intérieur de la cuve.According to the invention, this forced recirculation device comprises at least one surface element 8,21 developing substantially circularly along the wall 9 of the pulper, extending from the wall 9 towards the inside of the tank 1 and towards the upper opening 20̸ of the pulper over a constant distance 12.22 so as to form a strip of constant width 12, one of the faces 8a, 24 of the element being oriented towards the bottom of the tank so that all of the material 6 meeting this face 8a, 24 is diverted and folded into the interior of the tank.

Dans une première forme de réalisation illustrée à la figure 2, le dispositif de recirculation forcée 7 comporte une couronne 8 circulaire fermée, c'est-à-dire qui forme un anneau; elle s'étend depuis la paroi 9 vers l'axe 2 de la cuve, en faisant un angle 10̸ avec la paroi 9 de la cuve; la surface formée par cette couronne 8 inclinée réalise un tronc de cône dont le sommet se trouve du côté de l'ouverture supérieure 20̸ de la cuve 1.In a first embodiment illustrated in FIG. 2, the forced recirculation device 7 comprises a closed circular crown 8, that is to say which forms a ring; it extends from the wall 9 towards the axis 2 of the tank, at an angle 10̸ with the wall 9 of the tank; the surface formed by this inclined crown 8 produces a truncated cone, the top of which is on the side of the upper opening 20̸ of the tank 1.

L'angle 10̸ d'inclinaison de cette couronne 8 avec la paroi est compris entre 10̸° et 60̸° et dans l'exemple de réalisation l'angle choisi est de 45°.The angle 10̸ of inclination of this ring 8 with the wall is between 10̸ ° and 60̸ ° and in the embodiment the angle chosen is 45 °.

Le dispositif de recirculation selon cette forme de réalisation de la figure 2 est une cornière comportant deux ailes 8a, 11 formant entre elles un angle droit. Cette cornière est cintrée en un cercle de même diamètre extérieur que le diamètre intérieur de la cuve, et les extrémités des deux ailes de la cornière sont assemblées sur la paroi latérale 9 par tout moyen connu, par exemple, par soudure. Dans cette variante l'aile 8a a la fonction de couronne de déflexion.The recirculation device according to this embodiment of Figure 2 is an angle iron having two wings 8a, 11 forming between them a right angle. This angle is bent into a circle of the same outside diameter as the inside diameter of the tank, and the ends of the two wings of the angle are assembled on the side wall 9 by any known means, for example, by welding. In this variant, the wing 8a has the function of a deflection ring.

La couronne est montée perpendiculairement à l'axe 2 de la cuve : la distance de l'extrémité de l'arbre 4 à l'extrémité inférieure de la couronne (ou à l'extrémité supérieure) est constante.The crown is mounted perpendicular to the axis 2 of the tank: the distance from the end of the shaft 4 to the lower end of the crown (or to the upper end) is constant.

La largeur 12 de la couronne est comprise entre 10̸0̸ et 50̸0̸ millimètres.The width 12 of the crown is between 10̸0̸ and 50̸0̸ millimeters.

La distance 13 entre l'extrémité supérieure de l'arbre 4 et le plan 14 défini par le cercle d'extrémité supérieure de la couronne 8 varie entre 0̸ et 50̸0̸ millimètres.The distance 13 between the upper end of the shaft 4 and the plane 14 defined by the upper end circle of the crown 8 varies between 0̸ and 50̸0̸ millimeters.

Ce dispositif de recirculation permet d'atteindre des concentrations homogènes de 20̸% de teneur en matières sèches et plus :

  • toute la matière est recirculée : il n'y a pas de zone neutre où la pâte reste immobile, du fait du caractère isotrope du dispositif;
  • il est possible d'introduire pour une même quantité d'eau, jusqu'à 25% de papier en plus.
This recirculation device makes it possible to reach homogeneous concentrations of 20̸% of dry matter content and more:
  • all the material is recirculated: there is no neutral zone where the dough remains immobile, due to the isotropic nature of the device;
  • it is possible to introduce up to 25% more paper for the same amount of water.

Et cette élévation de concentration se réalise sans argumentation de puissance consommée, c'est-à-dire à puissance constante.And this increase in concentration is achieved without argumentation of power consumed, that is to say at constant power.

Cependant, avec cette variante de réalisation, on observe la formation de voûte au-dessus du rotor lorsque la matière, défléchie par la couronne, se dirige vers l'axe central 2. Et cette voûte, du fait de la densité élevée de la pâte, reste immobile au-dessus du rotor sans retomber dans le pulpeur, désamorçant ainsi le rotor qui tourne à vide.However, with this variant embodiment, we observe the formation of a vault above the rotor when the material, deflected by the crown, goes towards the central axis 2. And this vault, due to the high density of the dough , remains stationary above the rotor without falling back into the pulper, thus defusing the rotor which turns idle.

Pour remédier à cet inconvénient on détruit la formation de voûte en morcellant la couronne 8, en tronçons. En outre chaque tronçon de couronne, ou élément 21, est incliné, vers le haut, dans le sens de rotation du rotor.To remedy this drawback, the formation of a vault is destroyed by breaking up the crown 8 into sections. In addition, each crown section, or element 21, is inclined upwards in the direction of rotation of the rotor.

La figure 3 représente cette seconde forme de réalisation. Le dispositif de recirculation forcée comporte au moins un élément de surface 21 qui s'étend en hélice le long de la paroi 9 du pulpeur.Figure 3 shows this second embodiment. The forced recirculation device comprises at least one surface element 21 which extends in a helix along the wall 9 of the pulper.

Selon l'invention, il peut n'y avoir qu'un seul élément 21; par exemple, la couronne 8 peut être sectionnée et cintrée de manière hélicoïdale, les extrémités n'étant alors plus jointives. Dans ce cas, l'élément s'étend sur 360̸° au plus. Cette variante détruit l'isotropie de la déflexion et suffit à éviter la formation de voûte.According to the invention, there can be only one element 21; for example, the crown 8 can be sectioned and bent helically, the ends then no longer being contiguous. In this case, the element extends over 360̸ ° at most. This variant destroys the isotropy of the deflection and is sufficient to avoid the formation of a vault.

On peut prévoir également de disposer sur la paroi une pluralité d'éléments de surface 21. Ces éléments sont disposés circulairement en couronne autour de l'axe 2, de distance en distance, comme des aubes fixes devant lesquelles tournent le rotor 4.It is also possible to provide a plurality of surface elements 21 on the wall. These elements are arranged in a circular ring around the axis 2, from distance to distance, like fixed blades in front of which the rotor 4 rotate.

Les éléments sont constitués d'une bande métallique de largeur 22 constante qui, selon l'invention, s'étendent depuis la paroi vers l'ouverture supérieure 20̸, en faisant, d'une part un angle 10̸ avec la verticale, d'autre part un angle 23 avec l'horizontale. Cet élément de surface longe la paroi cylindrique du pulpeur en formant une surface de déflexion hélicoïdale, dont l'une des faces 24 est orientée vers le bas de la cuve; la pâte qui rencontre cet élément de surface est défléchie et détournée dans la cuve mais dans une direction comprise entre l'axe 2 et la paroi, comme le montre la figure 5.The elements consist of a metal strip of constant width 22 which, according to the invention, extends from the wall towards the upper opening 20̸, making, on the one hand an angle 10̸ with the vertical, on the other leaves an angle 23 with the horizontal. This surface element runs along the cylindrical wall of the pulper, forming a deflection surface helical, one of the faces 24 of which is oriented towards the bottom of the tank; the dough that meets this surface element is deflected and diverted into the tank but in a direction between the axis 2 and the wall, as shown in Figure 5.

Les éléments de surface sont réalisés , soit à partir d'une cornière, soit à partir d'un feuillard métallique profilé. Les extrémités de chaque élément 25 sont obturées d'un élément triangulaire métallique correspondant.The surface elements are made, either from an angle iron, or from a profiled metal strip. The ends of each element 25 are closed with a corresponding triangular metallic element.

Le nombre d'éléments 21 et leur longueur sont variables: ils peuvent se succéder en laissant entre eux un intervalle vide (comme illustré sur la figure 3) ou se recouvrir partiellement (figure 4) de manière à s'assurer de la recirculation de la totalité de la matière.The number of elements 21 and their length are variable: they can succeed each other leaving an empty gap between them (as illustrated in Figure 3) or partially overlap (Figure 4) so as to ensure the recirculation of the all of the material.

L'angle 10̸ d'inclinaison de l'élément de surface 21, comme celui de la couronne 8, avec la paroi 9, est compris entre 10̸° et 60̸°, et de préférence l'angle est de l'ordre de 35° à 45°.The angle 10̸ of inclination of the surface element 21, like that of the crown 8, with the wall 9, is between 10̸ ° and 60̸ °, and preferably the angle is of the order of 35 ° at 45 °.

L'angle d'inclinaison 23 de la direction longitudinale de l'hélice avec le plan perpendiculaire à l'axe du pulpeur, c'est-à-dire généralement avec l'horizontale, est compris entre environ 10 et 30°, et de préférence est de l'ordre de 15°.The angle of inclination 23 of the longitudinal direction of the propeller with the plane perpendicular to the axis of the pulper, that is to say generally with the horizontal, is between approximately 10 and 30 °, and preference is around 15 °.

Cette variante, en fonctionnement donne le résultat illustré sur la figure 5. La pâte en s'élevant rencontre les éléments de surface 21; chacun d'eux détourne la pâte qu'il reçoit et la rabat dans le pulpeur mais en la déviant par rapport au centre. Chaque lame de pâte 26 ainsi formée, s'élève et retombe sur la lame adjacente et ainsi de suite. Il y a donc recirculation de la totalité de la pâte sans formation de voûte.This variant, in operation gives the result illustrated in FIG. 5. The paste, rising up, meets the surface elements 21; each of them diverts the dough it receives and flaps it into the pulper but deviating it from the center. Each dough blade 26 thus formed, rises and falls on the adjacent blade and so on. There is therefore recirculation of the entire dough without formation of a vault.

Les résultats obtenus sont aussi étonnants qu'avec une couronne d'un seul tenant : augmentation de la concentration jusqu'à 25% de matières sèches au moins et cela à puissance égale.The results obtained are as astonishing as with a single crown: increase in the concentration up to 25% of dry matter at least and that at equal power.

On voit donc que l'invention permet de réduire le temps total de traitement d'une masse globale de papier (réalisé par une succession de traitements de lots de matière identiques) pour une consommation d'énergie inchangée : soit par la réduction de la durée de chaque traitement à densité initiale constante, soit par augmentation de la densité et donc par une réduction du nombre de lots à traiter.It can therefore be seen that the invention makes it possible to reduce the total processing time for an overall mass of paper (produced by a succession of treatments of identical batches of material) for an unchanged energy consumption: either by reducing the duration of each treatment at constant initial density, either by increasing the density and therefore by reducing the number of batches to be treated.

Claims (12)

1. Pulper for papermaking pulp of the type comprising a cylindrical vessel which is open at the top and closed by a base section provided with a rotor surmounted by a vertical shaft which extends along the central axis of rotation of the vessel inside the said vessel, the lateral wall of the vessel comprising a device for the enforced recirculation of the pulp, characterised in that the recirculation device (7) comprises at least one surface element (8, 21) which develops in a substantially circular manner along the pulper wall (9), extending from the wall towards the interior of the vessel (1) and towards the upper opening (20) of the pulper, over a constant distance (12, 22) so as to form a strip of constant width determining an oblique plane of which the lower face (24) faces downwards such that the pulp (6) impinging on this face (24) is diverted into the interior of the vessel in a single direction.
2. Pulper for papermaking pulp according to Claim 1, characterised in that the surface element is a closed circular ring (8) forming a truncated cone extending from the wall towards the vessel axis (2), inclined relative to the wall such that the apex of the truncated cone is adjacent the upper opening (20̸) of the pulper.
3. Pulper for papermaking pulp according to Claim 1, characterised in that the recirculation device comprises at least one surface element (21) which extends in a helical manner along the pulper wall (9), over a maximum of 360̸°.
4. Pulper for papermaking pulp according to Claim 3, characterised in that the surface elements (21) are disposed in a ring about the pulper axis (2) and this ring is disposed in a plane perpendicular to the said axis.
5. Pulper for papermaking pulp according to Claim 3, characterised in that the surface elements (21) extend and are disposed in a circular manner at intervals with a spacing such that their vertical projection forms a succession of ring sections.
6. Pulper for papermaking pulp according to Claim 3, characterised in that the surface elements (21) extend and are disposed in a circular manner such that they partially overlap one another and such that their vertical projection forms a continuous closed ring.
7. Pulper for papermaking pulp according to Claim 1, characterised in that the angle of inclination (10̸) of the surface element (8, 21) relative to the vertical wall (9) of the pulper is between 10̸° and 60̸°.
8. Pulper for papermaking pulp according to Claim 7, characterised in that the angle of inclination (10̸) is between 35° and 45°.
9. Pulper for papermaking pulp according to Claim 1, characterised in that the angle of inclination (23) of the longitudinal direction (24) with the plane perpendicular to the pulper axis (2) is between 10̸° and 30̸°.
10. Pulper for papermaking pulp according to Claim 1, characterised in that the width (12, 22) of the surface element (8, 21) is between 10̸0̸ and 50̸0̸ mm.
11. Pulper for papermaking pulp according to Claim 2, characterised in that the ring (8) is disposed in a plane perpendicular to the axis of revolution (2) of the vessel.
12. Pulper for papermaking pulp according to either of Claims 4 and 11, characterised in that the distance (13) between the upper end of the rotor shaft (4) and the plane (14) defined by the upper end circle of the ring (8) or the plane (15) defined by the upper end circle of the ring produced by the arrangement of the elements (21) varies between -50̸0̸ and +50̸0̸ mm.
EP89401001A 1988-04-18 1989-04-12 Pulper for papermaking pulp Expired - Lifetime EP0343023B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805103A FR2630139A1 (en) 1988-04-18 1988-04-18 PULP OF PAPER PULP
FR8805103 1988-04-18

Publications (2)

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EP0343023A1 EP0343023A1 (en) 1989-11-23
EP0343023B1 true EP0343023B1 (en) 1992-06-17

Family

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EP89401001A Expired - Lifetime EP0343023B1 (en) 1988-04-18 1989-04-12 Pulper for papermaking pulp

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US (1) US4938423A (en)
EP (1) EP0343023B1 (en)
JP (1) JPH0247380A (en)
DE (1) DE68901813T2 (en)
ES (1) ES2032122T3 (en)
FI (1) FI87808C (en)
FR (1) FR2630139A1 (en)

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Publication number Priority date Publication date Assignee Title
US5762756A (en) * 1994-11-21 1998-06-09 The Black Clawson Company Methods and apparatus for pulping and deinking
AUPO314396A0 (en) * 1996-10-22 1996-11-14 Wood, Jeffrey Robert Pulping apparatus
DE102005045469A1 (en) * 2005-05-18 2006-11-30 Repa Boltersdorf Gmbh Process for recovering fibers from a mixture containing fibers
DE102006045808B4 (en) * 2006-09-26 2016-02-18 Erni Production Gmbh & Co. Kg Connector with strain relief
CN104372706A (en) * 2013-08-12 2015-02-25 苏州维艾普新材料股份有限公司 Glass wool pulping device with guide spirals inside
CN104372702B (en) * 2014-12-15 2016-08-17 济南大学 A kind of pulper of low-power consumption low noise
AT517870B1 (en) * 2015-10-30 2019-03-15 Chemiefaser Lenzing Ag High concentration mixer for producing a cellulosic suspension with high cellulose concentration
DE102016013071A1 (en) * 2016-06-28 2017-12-28 Hans-Joachim Boltersdorf Device for treating material with a container
CN106400563B (en) * 2016-11-18 2017-11-03 绥阳县双龙纸业有限公司 hydrabrusher

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Publication number Priority date Publication date Assignee Title
US1958020A (en) * 1931-10-30 1934-05-08 Lancaster Processes Inc Apparatus for disintegrating and dispersing
DE845896C (en) * 1950-01-28 1952-08-07 Sture Walfried Wicksell Pulper
US3486702A (en) * 1966-11-01 1969-12-30 Papcel Celulosy Np Pulping apparatus
US3506202A (en) * 1967-03-31 1970-04-14 Edward H Cumpston Jr Pulper
FR2441681A1 (en) * 1978-11-17 1980-06-13 Lamort E & M IMPROVEMENTS IN PROCESSES AND APPARATUS FOR DISINTEGRATION OF CELLULOSIC MATERIALS
EP0122991A3 (en) * 1982-08-12 1985-02-06 The Black Clawson Company Apparatus and method for pulping paper making stock at high consistencies
US4593861A (en) * 1982-08-12 1986-06-10 The Black Clawson Company Apparatus for pulping paper making stock at high consistencies
US4725007A (en) * 1983-02-28 1988-02-16 The Black Clawson Company Apparatus for pulping high consistency paper making stock
FR2543183B1 (en) * 1983-03-25 1985-07-26 Lamort E & M METHOD AND DEVICE FOR SORTING A MIXTURE OF PAPER PULP AND IMPURITIES
FR2544756B1 (en) * 1983-04-22 1985-08-30 Lamort E & M IMPROVEMENTS ON DEFIBRATION TURBINES

Also Published As

Publication number Publication date
US4938423A (en) 1990-07-03
FI87808B (en) 1992-11-13
DE68901813T2 (en) 1993-02-04
ES2032122T3 (en) 1993-01-01
JPH0247380A (en) 1990-02-16
FI891821L (en) 1989-10-19
EP0343023A1 (en) 1989-11-23
DE68901813D1 (en) 1992-07-23
FR2630139A1 (en) 1989-10-20
FI87808C (en) 1993-02-25
FI891821A0 (en) 1989-04-17

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