WO2003025253A1 - Powering device for cathodes of diaphragm chlorine-soda electrolysis cells - Google Patents

Powering device for cathodes of diaphragm chlorine-soda electrolysis cells Download PDF

Info

Publication number
WO2003025253A1
WO2003025253A1 PCT/FR2002/003208 FR0203208W WO03025253A1 WO 2003025253 A1 WO2003025253 A1 WO 2003025253A1 FR 0203208 W FR0203208 W FR 0203208W WO 03025253 A1 WO03025253 A1 WO 03025253A1
Authority
WO
WIPO (PCT)
Prior art keywords
cathodes
copper plate
tank
power supply
supply device
Prior art date
Application number
PCT/FR2002/003208
Other languages
French (fr)
Inventor
Michel Pillet
Original Assignee
Amc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Amc filed Critical Amc
Publication of WO2003025253A1 publication Critical patent/WO2003025253A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/60—Constructional parts of cells
    • C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections

Definitions

  • the present invention relates to the electrical supply of a diaphragm electrolytic cell and relates in particular to the electrical supply of the cathodes of cells with a chlorine-soda electrolysis diaphragm.
  • the production of chlorine and sodium hydroxide is done by electrolysis of an aqueous solution of sodium chloride commonly called brine.
  • Three electrolysis processes are used today, diaphragm electrolysis, membrane electrolysis and mercury cathode electrolysis.
  • the present invention relates to diaphragm electrolytic cells (also called cells). They are mainly characterized by the fact that the products formed during the redox chemical reaction do not mix thanks to compartments which isolate between them the cathodes from the anodes. Thus, the hydrogen released at the cathode by reduction of the hydrogen ions as well as the sodium hydroxide produced does not come into contact with the chlorine produced at the anode by oxidation of the chloride ions.
  • the outer covering of the cathode in the form of a grid forms the diaphragm, commonly called a finger, and is sealed against hydrogen by virtue of its coating.
  • the coatings of cathodes traditionally made of asbestos will disappear, given the ban on the use of asbestos, in favor of substitute coatings which have a lifespan much longer than that of asbestos.
  • the appearance of such materials in diaphragm electrolytic cells has improved the efficiency of electrolysers.
  • manufacturers are more interested in optimizing electrical circuits for supplying electrolytic cells.
  • the cathode is supplied with electricity over its entire length by means of a stiffener electrically connected by at least one of its ends to the electrolysis tank.
  • a diaphragm electrolytic cell for the manufacture of chlorine generally comprises a certain number of cathodes and anodes in equal numbers intercalated and parallel and is crossed by a current of an intensity ranging from 40,000 to 140,000 A.
  • the current is transmitted to the stiffeners via copper plates welded to the steel walls of the tank with which they are in contact.
  • the walls of the tanks are generally thick for better resistance to corrosion and therefore have a high electrical resistance which proportionally decreases the electrical conductivity through the walls of the tank.
  • the copper outside the tank which supplies the current is exploded or collaminated on the steel of the walls of the tank.
  • This process allows to obtain good results N a level electrical conductivity of copper / steel contact while reducing the mechanical stresses ⁇ causing cracks present, in the processes of ( welding of copper on traditional steel.
  • the welding process by explosion is extremely expensive and - its manufacturing time is high on the order of several months.
  • the object of the invention is to improve the electrical supply device for the cathodes of a chlorine-sodium hydroxide diaphragm cell by a copper plate by optimizing the passage resistance and the cross-section of current flow between the copper plate and the electrolysis tank.
  • the object of the invention relates to ⁇ bnc, a device for the electrical supply of cathodes from a cell to chlorine-soda electrolysis diaphragm consisting of an electrolysis tank and of a plurality of cathodes and anodes in equal number, alternating and parallel to each other, the device comprising an electrical connection element composed of at least one plate of copper fixed by electrical connection means on the outside of one of the side walls of the electrolysis tank and electrically connected on the inside to the cathodes by means of stiffeners.
  • the means of electrical connection between the copper plate and the side wall of the tank are provided by a set of plug welds made through a set of openings previously made in the copper plate and whose ends in electrical contact with the side wall are arranged so that the paths to be traveled by the current between each plug weld and the end of the nearest stiffener are all identical.
  • FIG. 1 represents a side wall of the electrolytic cell where the copper plate is welded, and showing the ends of the cathodes welded to the copper plate
  • FIG. 2 is a transverse section of the vessel shown in FIG. 1, along the axis AA
  • FIG. 3 represents a transverse section of the side wall of the vessel on which is welded the copper plate
  • Figure 4 is a perspective view of the electrolytic cell with its electrical connection element.
  • the steel tank 10 seen from the side contains n identical cathodes 12-1 to 12 -n linked mechanically and electrically each to a stiffener 14-1 to 14-n.
  • the anodes are generally inserted between the cathodes.
  • the stiffeners 14-1 to 14-n are electrically connected to the side wall 11 on the inside of the tank 10.
  • An element 16 generally made of copper, outside the tank, provides the electrical connection between the source and the side wall 11 on the outside side. .
  • the element 16 is formed from at least one copper plate parallel to the side wall 11 of the tank, but can just as easily be formed from several copper parts perpendicular to each other and fixed to the side walls of the tank, one of the plates serving as electrical connection to the cathodes. Openings are made in this copper plate before it is mounted on the tank on the side wall 11.
  • the current arriving in the copper plate crosses the plug welds 18-1 to 18-m and comes to supply the cathodes via the stiffeners 14-1 to 14-n.
  • the section of the plug welds 18-1 to 18-m and therefore of the openings is a function of the current to be passed from the copper plate to the cathode to be supplied.
  • the current coming from the generator or another tank, arrives in the copper plate at its nominal value of the order of 100,000 A to supply all the cathodes with a current of the same intensity. Part of the current flows through the first cathode while the rest of the current continues through the copper plate. All cathodes 14-1 to 14-n are thus supplied by the copper plate and the current passing through the copper plate decreases in intensity between the first cathode to be supplied where it arrives at its nominal value and the last cathode to be supplied .
  • the copper plate serving as the electrical connection to the cathodes is formed of a superimposition of thin copper plates 20 to 23 of identical width and thickness and of different length, the number of which varies according to the number of cathodes to be supplied, the largest thin copper plate 20 being pressed against the wall side 11 of the tank on the outside.
  • the thickness of the copper plate gradually decreases between the first cathode 12-1 and the last 12-n.
  • the number of superimposed thin copper plates - and their size are adapted to the number of cathodes to be supplied and the value of the incoming current.
  • the thin copper plates are electrically and mechanically connected to each other by means of the plug welds and a perimeter weld, that is to say made at the outer limit of their outline.
  • the thin copper plate 20 of larger dimension is' welded on its contour to the side wall 11 outside of the tank 10.
  • the plate 21 shorter than the plate 20 is welded on its contour to the copper plate 21, and so .suite for all the copper plates from the largest to the smallest.
  • the copper plates could be replaced by a single copper plate whose thickness decreases at regular intervals from one end to the other of the side wall.
  • the plug welds are ideally located opposite each cathode because in this case, the length of the path to be traveled by the current is reduced to its minimum. In this case, there are as many plug welds as there are cathodes, but industrial production is very expensive.
  • a more economical preferred embodiment is represented by the sectional view of FIG. 3, where the number of cathodes is an even number.
  • Two plug welds 18-1 and 18-2 located side by side pass through three superimposed thin copper plates 20, 21 and 22 on the side wall 11 of the tank on the outside. Inside the tank, therefore on the side inside the side wall 11, the ends of the stiffeners 14-1 to 14-4 each supplying a cathode are in electrical contact with the wall 11.
  • the location of the plug weld 18 -1 is located halfway between the stiffeners 14-1 and 14-2, the location of the plug weld 18-2 is located halfway between the stiffeners 14-3 and 14-4 and so on for the location of all other plug welds, so that the paths to be traveled by the current between the end of the plug welds in contact with the side wall 11 on the outer side and the end of the stiffeners in contact with the side wall 11 on the side interior are all identical.
  • the electrical resistance between the plug welds and the cathodes is always the same. Therefore, in this preferred embodiment of the invention, there are half as many plug welds between the copper plate situated on the side wall 11 of the tank than there are cathodes to be supplied in the tank.
  • FIG. 4 is a simplified perspective view of the tank. It can be seen that the cathodes 12 connect the two walls 11 ⁇ and 41 of the tank perpendicularly connected on their external sides to the electrical connection element 16. As the preceding description describes the means of electrical connection of the copper plate and cathodes through the wall of the tank 11, it is valid for the connection on the opposite side of the cathodes to the wall 41 of the tank.
  • the device according to the invention has the advantage of supplying the current necessary for the cathodes with a voltage drop between the current source and the cathodes less than or equal to that obtained by the supplied tanks. by copper plates welded on the tank thanks to an explosion welding.
  • the copper plate supplying the cathodes according to the device of the invention consisting of a superposition of thin copper plates of different dimensions has the advantage of reducing the mass of copper in the current distributor plate in the cathodes by compared to traditional copper plates used in the supply of today's electrolytic cells.

Abstract

The invention concerns a device for powering cathodes of a diaphragm chlorine-soda electrolysis cell comprising: an electrical connection component (16) consisting of a copper plate fixed by electrical connecting means on the outside of one of the side walls (11) of the electrolysis tank (10) and electrically connected to the inside of the cathodes (21-1 to 12-n) through gird bars (14-1 to 14-n). The invention is mainly characterized in that the electrical connection means between the copper plate and the wall (11) are provided by an assembly of plug welds (18-1 to 18-m) through a plurality of orifices previously produced in the copper plates and whereof the ends in electrical contact with the side wall are arranged such that the travel paths of the current between each plug weld and the end of the closest gird bar should be all identical.

Description

Alimentation électrique des cathodes des cellules à diaphragme d'électrolyse chlore-soude Electricity supply of the cathodes of the diaphragm cells of chlorine-soda electrolysis
Domaine techniqueTechnical area
La présente invention concerne l'alimentation électrique d'une cuve à électrolyse à diaphragme et concerne en particulier l'alimentation électrique des cathodes des cellules à diaphragme d'électrolyse chlore- soude .The present invention relates to the electrical supply of a diaphragm electrolytic cell and relates in particular to the electrical supply of the cathodes of cells with a chlorine-soda electrolysis diaphragm.
Etat de la techniqueState of the art
La production de chlore et d'hydroxyde de sodium se fait par électrolyse d'une solution aqueuse de chlorure de sodium appelée communément saumure. Trois procédés d'électrolyse sont utilisés aujourd'hui, l' électrolyse avec diaphragme, l' électrolyse avec membrane et l' électrolyse à cathode de mercure. La présente invention porte sur les cuves (appelées également cellules) d'électrolyse à diaphragme. Elles sont caractérisées principalement par le fait que les produits formés pendant la réaction chimique d'oxydoréduction ne se mélangent pas grâce à des compartiments qui isolent entres elles les cathodes des anodes. Ainsi, l'hydrogène dégagé à la cathode par réduction des ions hydrogêne ainsi que l'hydroxyde de sodium produit ne rentre pas en contact avec le chlore produit à l'anode par oxydation des ions chlorure.The production of chlorine and sodium hydroxide is done by electrolysis of an aqueous solution of sodium chloride commonly called brine. Three electrolysis processes are used today, diaphragm electrolysis, membrane electrolysis and mercury cathode electrolysis. The present invention relates to diaphragm electrolytic cells (also called cells). They are mainly characterized by the fact that the products formed during the redox chemical reaction do not mix thanks to compartments which isolate between them the cathodes from the anodes. Thus, the hydrogen released at the cathode by reduction of the hydrogen ions as well as the sodium hydroxide produced does not come into contact with the chlorine produced at the anode by oxidation of the chloride ions.
L'habillage extérieur de la cathode sous forme de grillage forme le diaphragme, appelé communément doigt, et est étanche à 1 ' hydrogène grâce à son revêtement . Les revêtements des cathodes traditionnellement en amiante vont disparaître, compte tenu de l'interdiction de l'utilisation de l'amiante, au profit de revêtements de substitution qui ont une durée de vie bien supérieure à celle de l'amiante. L'apparition de tels matériaux dans les cuves d'électrolyse à diaphragme a amélioré le rendement des électrolyseurs . Aujourd'hui, grâce à cette innovation, les constructeurs s'intéressent davantage à optimiser les circuits électriques d'alimentation des cuves d'électrolyse.The outer covering of the cathode in the form of a grid forms the diaphragm, commonly called a finger, and is sealed against hydrogen by virtue of its coating. The coatings of cathodes traditionally made of asbestos will disappear, given the ban on the use of asbestos, in favor of substitute coatings which have a lifespan much longer than that of asbestos. The appearance of such materials in diaphragm electrolytic cells has improved the efficiency of electrolysers. Today, thanks to this innovation, manufacturers are more interested in optimizing electrical circuits for supplying electrolytic cells.
La cathode est alimentée en électricité sur toute sa longueur grâce à un raidisseur connecté électriquement par au moins une de ses extrémités à la cuve d'électrolyse. Une cuve d'électrolyse à diaphragme pour la fabrication du chlore comporte en général un certain nombre de cathodes et d'anodes en nombre égal intercalées et parallèles et est traversé par un courant d'une intensité allant de 40000 à 140000 A. Le courant est transmis aux raidisseurs par l'intermédiaire de plaques de cuivre soudées aux parois en acier de la cuve avec lesquelles ils sont en contact. Les parois des cuves sont généralement épaisses pour une meilleure résistance à la corrosion et de ce fait présentent une forte résistance électrique qui diminue proportionnellement la conductivité électrique à' travers les parois de la cuve. Pour améliorer le passage du courant à travers les parois de la cuve vers les cathodes, le cuivre à l'extérieur de la cuve qui apporte le courant est soudé par explosion ou colaminé sur l'acier des parois de la cuve.. Ce procédé permet d'obtenir de bons résultats Na niveau conductivité électrique de contact cuivre/acier tout en réduisant les contraintes mécanique^ à l'origine de fissures présentes, dans les procédés de (soudage du cuivre sur acier traditionnels. Cependant, le procédé de soudage par explosion est extrêmement coûteux et - son délai de fabrication est élevé de l'ordre de plusieurs mois.The cathode is supplied with electricity over its entire length by means of a stiffener electrically connected by at least one of its ends to the electrolysis tank. A diaphragm electrolytic cell for the manufacture of chlorine generally comprises a certain number of cathodes and anodes in equal numbers intercalated and parallel and is crossed by a current of an intensity ranging from 40,000 to 140,000 A. The current is transmitted to the stiffeners via copper plates welded to the steel walls of the tank with which they are in contact. The walls of the tanks are generally thick for better resistance to corrosion and therefore have a high electrical resistance which proportionally decreases the electrical conductivity through the walls of the tank. To improve the flow of current through the walls of the tank to the cathodes, the copper outside the tank which supplies the current is exploded or collaminated on the steel of the walls of the tank. This process allows to obtain good results N a level electrical conductivity of copper / steel contact while reducing the mechanical stresses ^ causing cracks present, in the processes of ( welding of copper on traditional steel. However, the welding process by explosion is extremely expensive and - its manufacturing time is high on the order of several months.
Exposé de l'inventionStatement of the invention
C'est pourquoi le but de l'invention est d'améliorer le dispositif d'alimentation électrique des cathodes d'une cellule diaphragme chlore-soude par une plaque de cuivre en optimisant la résistance de passage et la section de passage du courant entre la plaque de cuivre et la cuve d'électrolyse.This is why the object of the invention is to improve the electrical supply device for the cathodes of a chlorine-sodium hydroxide diaphragm cell by a copper plate by optimizing the passage resistance and the cross-section of current flow between the copper plate and the electrolysis tank.
L'objet de l'invention concerne βbnc un dispositif d'alimentation électrique de cathodes d'une cellule à diaphragme d'électrolyse chlore-soude constituée d'une cuve à électrolyse et d'une pluralité de cathodes et d'anodes en nombre égal, alternées et parallèles entre elles, le dispositif comprenant un élément de connexion électrique composé d'au moins une plaque de cuivre fixée par des moyens de connexion électrique côté extérieur d'une des parois latérales de la cuve d'électrolyse et connectée électriquement du côté intérieur aux cathodes grâce à des raidisseurs. Selon la caractéristique principale de l'invention, les moyens de connexion électrique entre la plaque de cuivre et la paroi latérale de la cuve sont assurés par un ensemble de soudures bouchon réalisées à travers un ensemble d'ouvertures pratiquées préalablement dans la plaque de cuivre et dont les extrémités en contact électrique avec la paroi latérale sont disposées de manière à ce que les chemins à parcourir par le courant entre chaque soudure bouchon et l'extrémité du raidisseur le plus proche soient tous identiques.The object of the invention relates to βbnc, a device for the electrical supply of cathodes from a cell to chlorine-soda electrolysis diaphragm consisting of an electrolysis tank and of a plurality of cathodes and anodes in equal number, alternating and parallel to each other, the device comprising an electrical connection element composed of at least one plate of copper fixed by electrical connection means on the outside of one of the side walls of the electrolysis tank and electrically connected on the inside to the cathodes by means of stiffeners. According to the main characteristic of the invention, the means of electrical connection between the copper plate and the side wall of the tank are provided by a set of plug welds made through a set of openings previously made in the copper plate and whose ends in electrical contact with the side wall are arranged so that the paths to be traveled by the current between each plug weld and the end of the nearest stiffener are all identical.
Brève description des dessinsBrief description of the drawings
Les buts, objets et caractéristiques de l'invention apparaîtront plus clairement à la lecture de la description qui suit faite en référence aux dessins dans lesquels : la figure 1 représente une paroi latérale de la cuve à électrolyse où la plaque de cuivre est soudée, et montrant les extrémités des cathodes soudées à la plaque de cuivre, la figure 2 est une coupe transversale de la cuve représentée sur la figure 1, selon l'axe A-A, la figure 3 représente une coupe transversale de la paroi latérale de la cuve sur laquelle est soudée la plaque de cuivre, la figure 4 est une vue en perspective de la cuve à électrolyse avec son élément de connexion électrique.The objects, objects and characteristics of the invention will appear more clearly on reading the description which follows, made with reference to the drawings in which: FIG. 1 represents a side wall of the electrolytic cell where the copper plate is welded, and showing the ends of the cathodes welded to the copper plate, FIG. 2 is a transverse section of the vessel shown in FIG. 1, along the axis AA, FIG. 3 represents a transverse section of the side wall of the vessel on which is welded the copper plate, Figure 4 is a perspective view of the electrolytic cell with its electrical connection element.
Description détaillée de l'inventionDetailed description of the invention
En référence à la figure 1, la cuve 10 en acier vue de côté, contient n cathodes identiques 12-1 à 12 -n liées mécaniquement et électriquement chacune à un raidisseur 14-1 à 14-n. Les anodes, non représentées sur la figure sont généralement intercalées entre les cathodes. Les raidisseurs 14-1 à 14-n sont connectés électriquement à la paroi latérale 11 côté intérieur de la cuve 10. Un élément 16 généralement en cuivre, extérieur à la cuve, assure la connexion électrique entre la source et la paroi latérale 11 coté extérieur. L'élément 16 est formé d'au moins une plaque de cuivre parallèle à la paroi latérale 11 de la cuve, mais peut tout aussi bien être formé de plusieurs parties de cuivre perpendiculaires entre elles et fixées aux parois latérales de la cuve, une des plaques servant de connexion électrique aux cathodes. Des ouvertures sont pratiquées dans cette plaque de cuivre avant son montage sur la cuve sur la paroi latérale 11. Des soudures identiques 18-1 à 18-m, appelées soudures bouchon, en un matériau bon conducteur donc de faible résistivité tel qu'un alliage cuivre- aluminium ou du cuivre, sont pratiquées à travers les ouvertures effectuées préalablement. Le courant arrivant dans la plaque de cuivre, traverse les soudures bouchons 18- 1 à 18-m et vient alimenter les cathodes par l'intermédiaire des raidisseurs 14-1 à 14-n. La section des soudures bouchon 18-1 à 18-m et donc des ouvertures est fonction du courant à faire passer de la plaque de cuivre à la cathode à alimenter. Ainsi, le courant, en provenance du générateur ou d'une autre cuve, arrive dans la plaque de cuivre à sa valeur nominale de l'ordre de 100000 A pour alimenter toutes les cathodes avec un courant de même intensité. Une partie du courant passe dans la première cathode tandis que le reste du courant continue dans la plaque de cuivre. Toutes les cathodes 14-1 à 14-n sont alimentées ainsi par la plaque de cuivre et le courant passant à travers la plaque de cuivre diminue en intensité entre la première cathode à alimenter où il arrive à sa valeur nominale et la dernière cathode à alimenter.With reference to FIG. 1, the steel tank 10 seen from the side, contains n identical cathodes 12-1 to 12 -n linked mechanically and electrically each to a stiffener 14-1 to 14-n. The anodes, not shown in the figure, are generally inserted between the cathodes. The stiffeners 14-1 to 14-n are electrically connected to the side wall 11 on the inside of the tank 10. An element 16 generally made of copper, outside the tank, provides the electrical connection between the source and the side wall 11 on the outside side. . The element 16 is formed from at least one copper plate parallel to the side wall 11 of the tank, but can just as easily be formed from several copper parts perpendicular to each other and fixed to the side walls of the tank, one of the plates serving as electrical connection to the cathodes. Openings are made in this copper plate before it is mounted on the tank on the side wall 11. Identical welds 18-1 to 18-m, called plug welds, made of a good conductive material therefore of low resistivity such as an alloy copper-aluminum or copper, are made through the openings previously made. The current arriving in the copper plate, crosses the plug welds 18-1 to 18-m and comes to supply the cathodes via the stiffeners 14-1 to 14-n. The section of the plug welds 18-1 to 18-m and therefore of the openings is a function of the current to be passed from the copper plate to the cathode to be supplied. Thus, the current, coming from the generator or another tank, arrives in the copper plate at its nominal value of the order of 100,000 A to supply all the cathodes with a current of the same intensity. Part of the current flows through the first cathode while the rest of the current continues through the copper plate. All cathodes 14-1 to 14-n are thus supplied by the copper plate and the current passing through the copper plate decreases in intensity between the first cathode to be supplied where it arrives at its nominal value and the last cathode to be supplied .
En référence à la figure 2, la plaque de cuivre servant de connexion électrique aux cathodes est formée d'une superposition de plaques de cuivre mince 20 à 23 de largeur et d'épaisseur identiques et de longueur différente et dont le nombre varie en fonction du nombre de cathodes à alimenter, la plus grande plaque de cuivre mince 20 étant plaquée contre la paroi latérale 11 de la cuve côté extérieur. Le courant, en provenance du générateur ou d'une autre cuve, arrive du côté où la plaque en cuivre est formée par la sμperposition de toutes les plaques de cuivre minceReferring to Figure 2, the copper plate serving as the electrical connection to the cathodes is formed of a superimposition of thin copper plates 20 to 23 of identical width and thickness and of different length, the number of which varies according to the number of cathodes to be supplied, the largest thin copper plate 20 being pressed against the wall side 11 of the tank on the outside. The current, coming from the generator or another tank, arrives from the side where the copper plate is formed by the sμperposition of all the thin copper plates
20 à 23 donc à travers la plus grande section de cuivre. Ensuite, l'épaisseur de la plaque de cuivre diminue petit à petit entre la première cathode 12-1 et la dernière 12-n. Le nombre de plaques de cuivre minces superposées - et leur dimension sont adaptés au nombre de cathodes à alimenter et à la valeur du courant entrant. Les plaques de cuivre minces sont reliées électriquement et mécaniquement entre elles grâce aux soudures'^bouchon et à une soudure périmétrique, c'est à dire réalisée en limite extérieure de leur contour. Ainsi, la plaque de cuivre mince 20 de plus grande dimension est 'soudée sur son contour à la paroi latérale 11 côté extérieur de la cuve 10. Ensuite, la plaque de cuivre mince20 to 23 therefore through the largest section of copper. Then, the thickness of the copper plate gradually decreases between the first cathode 12-1 and the last 12-n. The number of superimposed thin copper plates - and their size are adapted to the number of cathodes to be supplied and the value of the incoming current. The thin copper plates are electrically and mechanically connected to each other by means of the plug welds and a perimeter weld, that is to say made at the outer limit of their outline. Thus, the thin copper plate 20 of larger dimension is' welded on its contour to the side wall 11 outside of the tank 10. Next, the thin copper plate
21 plus courte que la plaque 20 est soudée sur son contour à la plaque de cuivre 21, et ainsi de .suite pour toutes les plaques de cuivre de la plus grande à la plus petite. A noter que les plaques de cuivre pourraient être remplacées par une seule plaque de cuivre dont l'épaisseur diminue à intervalles réguliers d'une extrémité à l'autre de la paroi latérale .21 shorter than the plate 20 is welded on its contour to the copper plate 21, and so .suite for all the copper plates from the largest to the smallest. Note that the copper plates could be replaced by a single copper plate whose thickness decreases at regular intervals from one end to the other of the side wall.
De façon générale, les soudures bouchon sont idéalement situées en face de chaque cathode car dans ce cas, la longueur du chemin à parcourir par le courant est réduit à son minimum. Dans ce cas, il y a autant de soudures bouchons qu'il y a de cathodes, mais la réalisation industrielle est très onéreuse. Un mode de réalisation préférentiel plus économique est représenté par la vue en coupe de la figure 3, où le nombre de cathodes est un nombre pair. Deux soudures bouchon 18-1 et 18-2 situées côte à côte traversent trois plaques de cuivre minces superposées 20, 21 et 22 sur la paroi latérale 11 de la cuve du côté extérieur. A l'intérieur de la cuve, donc du côté intérieur à la paroi latérale 11, les extrémités des raidisseurs 14-1 à 14-4 alimentant chacun une cathode sont en contact électrique avec la paroi 11. L'emplacement de la soudure bouchon 18-1 se situe à mi-chemin entre les raidisseurs 14-1 et 14-2, l'emplacement de la soudure bouchon 18-2 se situe à mi- chemin entre les raidisseurs 14-3 et 14-4 et ainsi de suite pour l'emplacement de toutes les autres soudures bouchon, afin que les chemins à parcourir par le courant entre 1 ' extrémité des soudures bouchon en contact avec \a paroi latérale 11 côté extérieur et l'extrémité des raidisseurs en contact avec la paroi latérale 11 côté intérieur soient tous identiques. Ainsi, la résistance électrique entre les soudures bouchon et les cathodes est toujours la même. Donc, dans ce mode de réalisation préféré de l'invention, il y a moitié moins de soudures bouchon entre la plaque de cuivre située sur la paroi latérale 11 de la cuve qu'il y a de cathodes à alimenter dans la cuve. Le courant passe des plaques de cuivre minces dans lai soudure bouchon, puis dans la paroi de la cuve pour ensuite alimenter les raidisseurs qui alimentent eux-mêmes les cathodes. Les passages du courant dans le sens cuivre/soudure puis soudure/cuve offrent peu de résistance. La figure 4 est une vue simplifiée en perspective de la cuve. On peut voir que les cathodes 12 relient perpendiculairement les deux parois 11 \et 41 de la cuve reliées sur leurs côtés extérieurs à l'élément de connexion électrique 16. Comme la description qui précède décrit les moyens de liaison électrique de la plaque de cuivre et des cathodes à travers la paroi de la cuve 11, elle est valable pour la liaison du côté opposé des cathodes à la paroi 41 de la cuve .Generally, the plug welds are ideally located opposite each cathode because in this case, the length of the path to be traveled by the current is reduced to its minimum. In this case, there are as many plug welds as there are cathodes, but industrial production is very expensive. A more economical preferred embodiment is represented by the sectional view of FIG. 3, where the number of cathodes is an even number. Two plug welds 18-1 and 18-2 located side by side pass through three superimposed thin copper plates 20, 21 and 22 on the side wall 11 of the tank on the outside. Inside the tank, therefore on the side inside the side wall 11, the ends of the stiffeners 14-1 to 14-4 each supplying a cathode are in electrical contact with the wall 11. The location of the plug weld 18 -1 is located halfway between the stiffeners 14-1 and 14-2, the location of the plug weld 18-2 is located halfway between the stiffeners 14-3 and 14-4 and so on for the location of all other plug welds, so that the paths to be traveled by the current between the end of the plug welds in contact with the side wall 11 on the outer side and the end of the stiffeners in contact with the side wall 11 on the side interior are all identical. Thus, the electrical resistance between the plug welds and the cathodes is always the same. Therefore, in this preferred embodiment of the invention, there are half as many plug welds between the copper plate situated on the side wall 11 of the tank than there are cathodes to be supplied in the tank. The current flows from thin copper plates in the plug welding, then in the wall of the tank to then supply the stiffeners which themselves supply the cathodes. Current flows in the copper / soldering direction then soldering / tank direction offer little resistance. Figure 4 is a simplified perspective view of the tank. It can be seen that the cathodes 12 connect the two walls 11 \ and 41 of the tank perpendicularly connected on their external sides to the electrical connection element 16. As the preceding description describes the means of electrical connection of the copper plate and cathodes through the wall of the tank 11, it is valid for the connection on the opposite side of the cathodes to the wall 41 of the tank.
Le dispositif selon l'invention présente l'avantage de fournir le courant nécessaire aux cathodes avec une chute de tension entre la source de courant et les cathodes inférieure ou égale à celle obtenue par les cuves alimentées par des plaques de cuivre soudées sur la cuve grâce à une soudure à explosion.The device according to the invention has the advantage of supplying the current necessary for the cathodes with a voltage drop between the current source and the cathodes less than or equal to that obtained by the supplied tanks. by copper plates welded on the tank thanks to an explosion welding.
A noter que le procédé de soudage par explosion de la plaque de cuivre ne permet pas de faire varier l'épaisseur de la plaque de cuivre alors que la section nécessaire pour alimenter les cathodes décroît.It should be noted that the method of explosion welding of the copper plate does not make it possible to vary the thickness of the copper plate while the section necessary to supply the cathodes decreases.
En outre, la plaque de cuivre alimentant les cathodes selon le dispositif de l'invention constituée d'une superposition de plaques de cuivre minces de dimension différente présente l'avantage de réduire la masse de cuivre de la plaque distributrice du courant dans les cathodes par rapport aux plaques de cuivre traditionnelles utilisées dans l'alimentation des cuves à électrolyse d'aujourd'hui. In addition, the copper plate supplying the cathodes according to the device of the invention consisting of a superposition of thin copper plates of different dimensions has the advantage of reducing the mass of copper in the current distributor plate in the cathodes by compared to traditional copper plates used in the supply of today's electrolytic cells.

Claims

REVENDICATIONS
1. Dispositif d'alimentation électrique de cathodes (12-1) à (12-n) d'une cellule à diaphragme d'électrolyse chlore-soude constituée d'une cuve à électrolyse (10) et d'une pluralité de cathodes et d'anodes en nombre égal, alternées et parallèles entre elles, ledit dispositif comprenant un élément de connexion électrique (16) composé d'au moins une plaque de cuivre fixée par des moyens de connexion électrique côté extérieur d'une des parois latérales (11) de la cuve d'électrolyse (10) et connectée électriquement du côté intérieur aux cathodes (12-1 à 12-n) grâce à des raidisseurs (14-1 à 14-n) , caractérisé en ce que les moyens de connexion électrique entre ladite plaque de cuivre et ladite paroi latérale de la cuve (llj sont assurés par un ensemble de soudures bouchon (18-1 à 18-m) réalisées à travers un ensemble d'ouvertures pratiquées préalablement dans ladite plaque . de cuivre et dont les extrémités en contact électrique avec ladite paroi latérale sont disposées de manière à ce que les chemins à parcourir par- le courant entre chaque soudure bouchon et l'extrémité du raidisseur le plus proche soient tous identiques.1. Device for electrically supplying cathodes (12-1) to (12-n) of a chlorine-sodium hydroxide electrolysis diaphragm cell consisting of an electrolytic cell (10) and a plurality of cathodes and anodes in equal number, alternate and parallel to each other, said device comprising an electrical connection element (16) composed of at least one copper plate fixed by electrical connection means on the outside of one of the side walls (11 ) from the electrolysis tank (10) and electrically connected on the inside to the cathodes (12-1 to 12-n) by means of stiffeners (14-1 to 14-n), characterized in that the electrical connection means between said copper plate and said side wall of the tank (11j are provided by a set of plug welds (18-1 to 18-m) made through a set of openings previously made in said copper plate and whose ends in electrical contact with said wall i lateral are arranged so that the paths to travel along the current between each plug weld and the end of the nearest stiffener are all identical.
2. Dispositif d'alimentation électrique selon la revendication 1, dans lequel le nombre de soudures bouchon (18-1 à 18-m) est égal au nombre de cathodes (12-1 à 12-n) , l'extrémité de chacune desdites soudures bouchon étant située en face de l'extrémité du raidisseur associé à la cathode correspondante .2. Power supply device according to claim 1, in which the number of plug welds (18-1 to 18-m) is equal to the number of cathodes (12-1 to 12-n), the end of each of said cap welds being located opposite the end of the stiffener associated with the corresponding cathode.
3. Dispositif d'alimentation électrique selon la revendication 1, dans lequel il y a un nombre pair de cathodes (12-1 à 12-n) et moitié moins de soudures bouchon3. Power supply device according to claim 1, in which there are an even number of cathodes (12-1 to 12-n) and half as many plug welds
(18-1 à 18-m), l'extrémité de chacune desdites soudures bouchon étant située à mi-chemin des extrémités des raidisseurs (14-1 à 14-n) associés respectivement aux deux cathodes de chaque paire distincte de cathodes .(18-1 to 18-m), the end of each of said plug welds being located halfway between the ends of the stiffeners (14-1 to 14-n) respectively associated with the two cathodes of each separate pair of cathodes.
4. Dispositif d'alimentation électrique selon la revendication 1, 2 ou 3, dans lequel ladite plaque de cuivre est composée d'une pluralité de plaques de cuivre minces (20 à 23) superposées de même épaisseur, de même largeur et de longueur différente, la plus grande plaque de cuivre mince (20) étant fixée à ladite paroi latérale de la cuve et lesdites plaques de cuivre minces étant disposées de manière à ce que la section de ladite plaque de cuivre diminue entre la première cathode (12-1) à alimenter et la dernière cathode (12-n) , de façon à alimenter toutes les cathodes (12-1) à (12 -n) avec approximativement la même intensité de courant.4. Power supply device according to claim 1, 2 or 3, wherein said copper plate is composed of a plurality of thin copper plates (20 to 23) superimposed of the same thickness, the same width and different length , the largest thin copper plate (20) being fixed to said side wall of the tank and said thin copper plates being arranged so that the section of said copper plate decreases between the first cathode (12-1) to be supplied and the last cathode (12-n), so as to supply all the cathodes (12-1) to (12 -n) with approximately the same current intensity.
5. Dispositif d'alimentation électrique selon l'une des- revendications 1 à 4, dans laquelle les soudures bouchon (18-1 18-m) sont réalisées dans un matériau conducteur et donc de faible résistivité.5. Power supply device according to one of claims 1 to 4, wherein the plug welds (18-1 18-m) are made of a conductive material and therefore of low resistivity.
6. Dispositif d'alimentation électrique selon la revendication 5, dans laquelle les soudures bouchon (18-1 18-m) sont réalisées en cuivre.6. Power supply device according to claim 5, wherein the plug welds (18-1 18-m) are made of copper.
7. Dispositif d'alimentation électrique selon la revendication 5, dans laquelle les soudures bouchon (18-1 à 18-m) sont réalisées en alliage cuivre aluminium.7. Power supply device according to claim 5, wherein the plug welds (18-1 to 18-m) are made of aluminum copper alloy.
8. Dispositif d'alimentation électrique selon la revendication 4, dans laquelle ladite plus grande plaque de cuivre mince (20) est fixée à ladite paroi latérale de la cuve par une soudure périmétrique .8. The power supply device according to claim 4, wherein said larger thin copper plate (20) is fixed to said side wall of the tank by a perimeter weld.
9. Dispositif d'alimentation électrique selon la revendication 8, dans laquelle les plaques de cuivre minces (20 à 23) sont fixées entre elles par une soudure périmétrique . 9. The power supply device according to claim 8, wherein the thin copper plates (20 to 23) are fixed to each other by a perimeter weld.
PCT/FR2002/003208 2001-09-19 2002-09-19 Powering device for cathodes of diaphragm chlorine-soda electrolysis cells WO2003025253A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR01/12103 2001-09-19
FR0112103A FR2829776B1 (en) 2001-09-19 2001-09-19 POWER SUPPLY FOR CATHODES OF CELLS WITH CHLORINE-SODIUM ELECTROLYSIS

Publications (1)

Publication Number Publication Date
WO2003025253A1 true WO2003025253A1 (en) 2003-03-27

Family

ID=8867429

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2002/003208 WO2003025253A1 (en) 2001-09-19 2002-09-19 Powering device for cathodes of diaphragm chlorine-soda electrolysis cells

Country Status (2)

Country Link
FR (1) FR2829776B1 (en)
WO (1) WO2003025253A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859196A (en) * 1974-01-03 1975-01-07 Hooker Chemicals Plastics Corp Electrolytic cell including cathode busbar structure, cathode fingers, and anode base
EP0899360A1 (en) * 1997-08-08 1999-03-03 De Nora S.P.A. Diaphragm chlor-alkali electrolysis cell
WO2000006798A1 (en) * 1998-07-30 2000-02-10 Eltech Systems Corporation Busbar structure for diaphragm cell

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859196A (en) * 1974-01-03 1975-01-07 Hooker Chemicals Plastics Corp Electrolytic cell including cathode busbar structure, cathode fingers, and anode base
EP0899360A1 (en) * 1997-08-08 1999-03-03 De Nora S.P.A. Diaphragm chlor-alkali electrolysis cell
WO2000006798A1 (en) * 1998-07-30 2000-02-10 Eltech Systems Corporation Busbar structure for diaphragm cell

Also Published As

Publication number Publication date
FR2829776B1 (en) 2004-01-02
FR2829776A1 (en) 2003-03-21

Similar Documents

Publication Publication Date Title
FR2491957A1 (en) ELECTROCHEMICAL CELL ASSEMBLY AND METHOD FOR REDUCING THE LEAKAGE CURRENT
EP0151055B1 (en) Apparatus for the galvanic recovery of metals from diluted solutions
EP1383941A1 (en) Modular electrochemical cell
EP3012892B1 (en) Electrochemical device with stack
FR2718886A1 (en) Electrical connection system for electrochemical generator.
FR2530027A1 (en) POLARITY INVERSION ELECTRODES, IN PARTICULAR FOR ELECTRODIALYSIS OPERATIONS
EP0056759B1 (en) Device for feeding and evacuating liquid electrolyte in filter-press type electrolysis cells
EP2545207A1 (en) Device for high-temperature water electrolysis having improved operation
WO2003025253A1 (en) Powering device for cathodes of diaphragm chlorine-soda electrolysis cells
FR3092841A1 (en) Electrolysis cell for electrolytic treatment of a liquid
EP3383145B1 (en) Plasma torch
FR3040397A1 (en) HYDROGEN GENERATOR BY ELECTROLYSIS OF WATER
EP1826851A1 (en) Centering pin for an electrochemical cell stack
WO2003029525A1 (en) Electric power supply for cathodes of chlorine-sodium electrolytic cell
EP2057098B1 (en) Apparatus including at least one electrolytic cell
CA2838239A1 (en) Easily produced interconnecting module for a high-temperature water electrolysis device
BE1004689A4 (en) Bipolar electrode for a serial electrolyser and a serial electrolyser
FR2896623A1 (en) Full cell for motor vehicle, has bipolar plate supplying reactive gas to membrane electrode assembly cells and including intermediate conducting plate arranged between pressed plates delimiting conduits in which gas and coolant circulates
FR2604449A1 (en) Diaphragm electrolysis cell e.g. for chlorine prodn.
FR2503739A1 (en) CATHODIC ASSEMBLY FOR ELECTROLYSIS CELL
FR2674258A1 (en) Bipolar electrode for an electrolyser of the series type and electrolyser of the series type
EP0292466B1 (en) Electrode for an electrolytic cell
EP0061942A1 (en) Fuel cells
EP1525640A2 (en) Fuel cell, cell or group of cells belonging to said fuel cell, replacement kit for said fuel cell and method for making same
FR2504941A1 (en) UNIFORM DISTRIBUTION ELECTROLYSIS CELL

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BY BZ CA CH CN CO CR CU CZ DE DM DZ EC EE ES FI GB GD GE GH HR HU ID IL IN IS JP KE KG KP KR LC LK LR LS LT LU LV MA MD MG MN MW MX MZ NO NZ OM PH PL PT RU SD SE SG SI SK SL TJ TM TN TR TZ UA UG US UZ VN YU ZA ZM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ UG ZM ZW AM AZ BY KG KZ RU TJ TM AT BE BG CH CY CZ DK EE ES FI FR GB GR IE IT LU MC PT SE SK TR BF BJ CF CG CI GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP