WO2008120993A1 - Améliorations concernant des cellules d'électrolyse branchées en série et leur procédé d'exploitation - Google Patents

Améliorations concernant des cellules d'électrolyse branchées en série et leur procédé d'exploitation Download PDF

Info

Publication number
WO2008120993A1
WO2008120993A1 PCT/NO2008/000087 NO2008000087W WO2008120993A1 WO 2008120993 A1 WO2008120993 A1 WO 2008120993A1 NO 2008000087 W NO2008000087 W NO 2008000087W WO 2008120993 A1 WO2008120993 A1 WO 2008120993A1
Authority
WO
WIPO (PCT)
Prior art keywords
cathode
bus bar
current
collector
accordance
Prior art date
Application number
PCT/NO2008/000087
Other languages
English (en)
Inventor
Frank Ovstetun
_Christian Droste
Original Assignee
Norsk Hydro Asa
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 Norsk Hydro Asa filed Critical Norsk Hydro Asa
Priority to BRPI0809671A priority Critical patent/BRPI0809671B1/pt
Priority to EP08723979.4A priority patent/EP2150639B1/fr
Priority to EA200901330A priority patent/EA016404B1/ru
Priority to AU2008233392A priority patent/AU2008233392B2/en
Priority to NZ579815A priority patent/NZ579815A/en
Priority to CN2008800107143A priority patent/CN101663422B/zh
Priority to CA2681205A priority patent/CA2681205C/fr
Publication of WO2008120993A1 publication Critical patent/WO2008120993A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/16—Electric current supply devices, e.g. bus bars

Definitions

  • the present invention relates to improvements to electrolysis cells connected in series and a method for operating the same.
  • the invention relates to a bus bar system and followingly electrical current distribution in cells of the Hall-Heroult type for production of aluminium.
  • Each cell is constituted by an insulated parallelepiped steel container supporting a cathode containing prebaked carbon blocks in which there are sealed some steel rods known as cathode current collector bars, which conduct the current out of the cell, traditionally approximately 50% from each of the long sides of the cell.
  • the outlets of the cathode current collector bars are connected to the busbar system, which serve to conduct the current from the cathodes towards the anodes of the following cell.
  • the anode system composed of carbon, steel and aluminium, is fixed on a so-called “anode frame", with anode rods adjustable in height and electrically connected to the cathode rods of the preceding cell.
  • the electrolyte that is the solution of alumina in a molten cryolite mixture at 940-980 0 C, is located between the anode system and the cathode.
  • the aluminium produced is deposited on the cathode surface.
  • a layer of liquid aluminium is kept permanently on the bottom of the cathode crucible.
  • the crucible is rectangular, the anode frame supporting the anodes is generally parallel to its large sides, whereas the cathode rods are parallel to its small sides known as cell heads.
  • the main magnetic field in the cell is created by the current flow in the anode and the cathode system. All other current flows will give perturbations to this created main field.
  • the cells are arranged in rows and can be disposed transversely in a side-by-side orientation; their short side is parallel to the axis of the potline. Alternatively, disposed longitudinally in an end-to-end orientation, their long side is parallel to the axis of the potline.
  • one potline is represented by two rows of cells. The current has opposite directions in the two rows.
  • the cells are connected electrically in series, the ends of the series being connected to the positive and negative outputs of an electric rectification and control substation.
  • the current distribution through the anode system is mainly affected by the arrangement of the anodes in the cell, as well as the design of the stub configuration of the anode hanger and their interface with the individual anode.
  • collector bars When it comes to the cathode system, it is normally designed in a manner where collector bars are embedded in individual cathode blocks in a horizontal manner. This technological solution has shown to be very reliable regarding problems with leakages of melt or bath through the cathode system. Further, the collector bars will be protected by the surrounding cathode material (carbon based material) that is highly resistant against high temperatures and corrosive attacks. Commonly, bus bars collect the current outside the cathode shell.
  • One shortcoming by this prior art is that the current distribution in the cathode system will be more intensive in the periphery of the cathode blocks than elsewhere.
  • the current should advantageously be distributed in a predefined manner, and at more appropriate areas of the cathode system, to obtain an even current distribution.
  • current that is led out of the cathode system at the so called up-stream side of the cathode have to be led towards the so called down-stream side of the cathode and further to the anode system of the neighbouring cell in the series.
  • This way of conducting current upstream in parts of the cathode and subsequently downstream in the busbar system, will represent a system where parts of the cell's current is led through a longer distance than strictly necessary.
  • the designer should have several degrees of freedom in the process of developing an optimum cathode system, using skill to select a configuration (topology), which can result in an optimum current distribution.
  • the current distribution in the cathode system and correspondingly the lay-out of the bus bar system can be improved, due to the application of at least one current outlet arranged between the ends of the cathode.
  • the present invention includes the application of vertical current leads.
  • the current leads (current outlets) can advantageously be electrically connected to horizontal collector bar elements that may extend partly or wholly through the cathode block. In the latter, its outermost end(-s) can be connected to the bus bar system for the cell.
  • the preferred cathodic current distribution will depend on characteristic of the busbar system. It can be quite different for retrofitting the invention to existing busbar systems on one hand, or for a new busbar system design on the other hand. Hence, the preferred amount of current conducted out of the vertical outlets can be within the range 20-100 %, with 100 % representing a design with only vertical outlets.
  • the amount of current leads can be relatively low, for instance in an embodiment applying a commonly used amount of horizontal collector bars.
  • the MHD effects in an electrolysis cell can be improved, and it is possible to simplify the bus bar design of said cell by reducing its weight. As a consequence the investment costs can be reduced.
  • Figure 1 discloses in perspective a schematic lay-out of a bus bar system in accordance with the present invention, the cells being arranged in a side-by-side manner,
  • Figure 2 discloses in a top view, the same lay-out as disclosed in Fig. 1.
  • Figure 3 represents a second embodiment of the invention and discloses in perspective a schematic lay-out of a bus bar system where the cells are arranged in an end-to-end manner
  • Figure 4 discloses in a top view, the same lay-out as disclosed in Fig. 3
  • One purpose of the described design is to obtain a low cathode voltage drop and an even or flat current distribution at the cathode block surface with improved Magnet Hydrodynamic stability. This can be achieved by means of a simplified busbar system (less weight and thereby cheaper), where the design of the individual bus bar elements is optimized.
  • Fig. 1 and 2 disclose one embodiment of a bus bar system 1 that conduct current from the cathode system in one first electrolysis cell to the anode system of its neighboring cell.
  • the cells are arranged in a side-by-side manner.
  • the bus bar elements of the anode system are indicated as anode beams 2, 3, for connecting electrically the anodic structure of the cell.
  • Individual anodes are indicated at A, A'.
  • anode risers one of those denoted as reference sign 6.
  • connections 7, for conducting current from collector bar outlets of the cathode (not shown) to a downstream arranged collector bus bar 10 which in turn is connected with the above mentioned risers.
  • connection 8 For the conductance of current from an intermediate region of the cathode, there is arranged one or more connections 8 which in turn is electrically connected to a intermediate collector bus bar 11.
  • the connection 8 is at the other hand electrically connected to a corresponding current outlet in the cathode (not shown).
  • collector bus bar 12 having plural connections 9 for conducting current from the cathode collector bar ends.
  • bus bar elements such as 13, 15, 16, conducting current from the cathode system to the downstream side of the cathode and further to the corresponding risers 6.
  • bus bar element 13 can be arranged outside the cell's foot print to compensate for unwanted magnetic disturbancies.
  • bus bar lay-out in this embodiment is of a symmetrical type, a similar bus bar element is arranged at the opposite end of the cell.
  • Bus bar element 15 and the corresponding elements 16 etc. towards the opposite side of the cell conduct current from the intermediate collector bus bar 11 arranged in the cathode system and further to the collector bus bar 10.
  • one or more bus bar elements 17 can be arranged beneath the cathode shell, to optimize the magnetic field compensation. Such elements are preferably arranged in a skew-symmetric manner (not shown), to optimize the effect of magnetic field compensation.
  • the bus bar system can conduct current from both current outlets arranged at the upstream and downstream side of the cathode system together with one or more intermediate positions in an advantageous manner with regard to obtain an even current distribution in the cell's cathode structure, and further to reduce the weight of the bus bar system as a whole.
  • Figure 3 discloses a second embodiment of the invention, where it in perspective is disclosed a schematic lay-out of a bus bar system, the cells being arranged in an end-to- end manner.
  • Figure 4 discloses in a top view, the same layout as disclosed in Fig. 3.
  • the bus bar system 100 conducts current from the cathode system in one first electrolysis cell to the anode system of its neighboring cell.
  • the bus bar elements of the anode system are indicated as anode beams 202, 203, for connecting electrically the anodic structure of the cell.
  • Individual anodes are indicated at A, A'. Further there are shown anode risers 206, 206', 206", 206'".
  • collector bus bars 210, 212 having electrical connections 207, 209 that are electrically connected with the cathode's collector bars (not shown).
  • the collector bus bars 210, 212 are at the other hand connected with the anode risers 206, 206' and via bus bar elements 218, 219 with the anode risers 206", 206'" of the neighboring cell.
  • connection 208 For the conductance of current from an intermediate region of the cathode, there is arranged one or more connections 208 which in turn is electrically connected to a intermediate collector bus bar 211.
  • the connection 208 is at the other hand electrically connected to a corresponding current outlet in the cathode (not shown).
  • the intermediate collector bus bar 211 is further connected with bus bar elements 218, 219 via bus bar elements 220, 221, 222.
  • the bus bar system can conduct current from both current outlets arranged at both sides of the cathode system together with one or more intermediate positions in an advantageous manner with regard to obtain an even current distribution in the cell's cathode structure, and further to reduce the weight of the bus bar system as a whole.
  • the amount of current that is distributed through the individual bus bar elements can be pre-calculated and optimized assisted by design software and verification trials.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

L'invention concerne un procédé et des améliorations se rapportant à une cellule d'électrolyse, où la cellule comprend une cathode pratiquement horizontale d'un matériau électronique conducteur et comporte en outre en elle des conducteurs de courant tels que des barres collectrices horizontales. La cellule comprend en outre un système de barres omnibus. La cellule peut être mise en œuvre par une distribution améliorée du courant, pendant que ledit système de barres omnibus conduit le courant depuis au moins une position intermédiaire de la cathode. L'invention peut s'appliquer à des cellules mises à la fois bout à bout et côte à côte.
PCT/NO2008/000087 2007-04-02 2008-03-10 Améliorations concernant des cellules d'électrolyse branchées en série et leur procédé d'exploitation WO2008120993A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BRPI0809671A BRPI0809671B1 (pt) 2007-04-02 2008-03-10 método para operar células eletrolíticas do tipo hall-heroult para produção de alumínio conectadas em série, e, células eletrolíticas do tipo hall-heroult para produção de alumínio
EP08723979.4A EP2150639B1 (fr) 2007-04-02 2008-03-10 Cellules d'électrolyse branchées en série et leur procédé d'exploitation
EA200901330A EA016404B1 (ru) 2007-04-02 2008-03-10 Последовательное соединение электролизеров и способ работы соединенных таким образом электролизеров
AU2008233392A AU2008233392B2 (en) 2007-04-02 2008-03-10 Improvements relating to electrolysis cells connected in series and a method for operation of same
NZ579815A NZ579815A (en) 2007-04-02 2008-03-10 Electrolysis cells where the cathode bars have a combination of vertical and horizontal outlets
CN2008800107143A CN101663422B (zh) 2007-04-02 2008-03-10 与串联连接的电解槽相关的改进及其操作方法
CA2681205A CA2681205C (fr) 2007-04-02 2008-03-10 Ameliorations concernant des cellules d'electrolyse branchees en serie et leur procede d'exploitation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20071766 2007-04-02
NO20071766A NO331318B1 (no) 2007-04-02 2007-04-02 Fremgangsmate for drift av elektrolyseceller koblet i serie samt samleskinnesystem for samme

Publications (1)

Publication Number Publication Date
WO2008120993A1 true WO2008120993A1 (fr) 2008-10-09

Family

ID=39808490

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2008/000087 WO2008120993A1 (fr) 2007-04-02 2008-03-10 Améliorations concernant des cellules d'électrolyse branchées en série et leur procédé d'exploitation

Country Status (10)

Country Link
EP (1) EP2150639B1 (fr)
CN (1) CN101663422B (fr)
AU (1) AU2008233392B2 (fr)
BR (1) BRPI0809671B1 (fr)
CA (1) CA2681205C (fr)
EA (1) EA016404B1 (fr)
NO (1) NO331318B1 (fr)
NZ (1) NZ579815A (fr)
WO (1) WO2008120993A1 (fr)
ZA (1) ZA200906503B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107541752A (zh) * 2016-06-28 2018-01-05 沈阳铝镁设计研究院有限公司 一种铝电解槽电流自均衡母线网络结构

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470083A (en) 1963-11-22 1969-09-30 Vaw Ver Aluminium Werke Ag Electrolytic cell cathode bottom with vertically inserted current conductor
US3575827A (en) 1967-12-06 1971-04-20 Arthur F Johnson System for reduction of aluminum
GB2008617A (en) 1977-11-23 1979-06-06 Alcan Res & Dev Electrolytic Reduction Cell
DE2916971A1 (de) 1979-03-23 1980-09-25 Alusuisse Elektrolysezelle zur aluminiumherstellung durch schmelzflusselektrolyse von aluminiumsalzen
WO1981001299A1 (fr) 1979-11-07 1981-05-14 Pechiney Aluminium Procede et dispositif pour la suppression des perturbations magnetiques dans les cuves d'electrolyse
DE3004071A1 (de) 1979-12-21 1981-07-02 Schweizerische Aluminium AG, 3965 Chippis Schienenanordnung
EP0345959A1 (fr) 1988-06-06 1989-12-13 Norsk Hydro A/S Agencement de conducteurs concernant des cuves d'électrolyse placées en travers
EP0371653A1 (fr) 1988-11-28 1990-06-06 Norsk Hydro A/S Système de barres de conduction de courant pour cuves d'électrolyse placées transversalement
WO2008033034A1 (fr) 2006-09-14 2008-03-20 Norsk Hydro Asa Cellule d'électrolyse et procédé de fonctionnement de ladite cellule

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0016728A1 (fr) * 1979-03-23 1980-10-01 Schweizerische Aluminium AG Cellule électrolytique pour la production d'aluminium par électrolyse ignée de sels d'aluminium

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470083A (en) 1963-11-22 1969-09-30 Vaw Ver Aluminium Werke Ag Electrolytic cell cathode bottom with vertically inserted current conductor
US3575827A (en) 1967-12-06 1971-04-20 Arthur F Johnson System for reduction of aluminum
GB2008617A (en) 1977-11-23 1979-06-06 Alcan Res & Dev Electrolytic Reduction Cell
DE2916971A1 (de) 1979-03-23 1980-09-25 Alusuisse Elektrolysezelle zur aluminiumherstellung durch schmelzflusselektrolyse von aluminiumsalzen
WO1981001299A1 (fr) 1979-11-07 1981-05-14 Pechiney Aluminium Procede et dispositif pour la suppression des perturbations magnetiques dans les cuves d'electrolyse
DE3004071A1 (de) 1979-12-21 1981-07-02 Schweizerische Aluminium AG, 3965 Chippis Schienenanordnung
EP0345959A1 (fr) 1988-06-06 1989-12-13 Norsk Hydro A/S Agencement de conducteurs concernant des cuves d'électrolyse placées en travers
EP0371653A1 (fr) 1988-11-28 1990-06-06 Norsk Hydro A/S Système de barres de conduction de courant pour cuves d'électrolyse placées transversalement
WO2008033034A1 (fr) 2006-09-14 2008-03-20 Norsk Hydro Asa Cellule d'électrolyse et procédé de fonctionnement de ladite cellule

Also Published As

Publication number Publication date
EA200901330A1 (ru) 2010-02-26
BRPI0809671A2 (pt) 2014-10-07
AU2008233392A1 (en) 2008-10-09
EP2150639A1 (fr) 2010-02-10
CA2681205C (fr) 2014-02-04
ZA200906503B (en) 2010-06-30
BRPI0809671B1 (pt) 2018-10-30
NZ579815A (en) 2012-04-27
CN101663422A (zh) 2010-03-03
NO331318B1 (no) 2011-11-21
NO20071766L (no) 2008-10-03
EP2150639B1 (fr) 2018-05-16
CA2681205A1 (fr) 2008-10-09
EP2150639A4 (fr) 2014-03-05
CN101663422B (zh) 2011-12-28
EA016404B1 (ru) 2012-04-30
AU2008233392B2 (en) 2012-04-26

Similar Documents

Publication Publication Date Title
EP1812626B1 (fr) Procede de connexion electrique et de compensation magnetique de cuves d'electrolyse d'aluminium, et systeme associe
RU2449058C2 (ru) Электролизер для производства алюминия, содержащий средства для уменьшения падения напряжения
AU2007295188B2 (en) Electrolysis cell and method for operating the same
WO2007004075A2 (fr) Ensemble barre omnibus de module pour cellules electrolytiques d'aluminium haute puissance
CA2681205C (fr) Ameliorations concernant des cellules d'electrolyse branchees en serie et leur procede d'exploitation
US3775281A (en) Plant for production of aluminum by electrolysis
US3728243A (en) Electrolytic cell for the production of aluminum
WO2017051317A1 (fr) Système de barre omnibus de cathode pour cellules électrolytiques disposées côte à côte en série
WO2017163154A1 (fr) Système de barre omnibus permettant de compenser le champ magnétique dans des rangées adjacentes de cellules électrolytiques placées transversalement
WO2017168310A1 (fr) Bloc cathode à insert cuivre-aluminium pour cellule électrolytique convenant au procédé hall-héroult
WO2017187323A1 (fr) Système de barre omnibus pour cellules électrolytiques disposées côte à côte en série
WO2019162817A1 (fr) Cellule électrolytique dotée d'une superstructure ayant des pattes intermédiaires, appropriée pour le procédé hall-héroult
WO2018234946A1 (fr) Installation d'électrolyse utilisant le procédé hall-héroult, à compensation du champ magnétique vertical

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880010714.3

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08723979

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2008723979

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2681205

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 5966/DELNP/2009

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 579815

Country of ref document: NZ

WWE Wipo information: entry into national phase

Ref document number: 2008233392

Country of ref document: AU

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2008233392

Country of ref document: AU

Date of ref document: 20080310

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 200901330

Country of ref document: EA

ENP Entry into the national phase

Ref document number: PI0809671

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20090929