[go: up one dir, main page]

EP0342033A1 - Arrangement for the compensation of damaging magnetic fields on transverely disposed electrolysis cells - Google Patents

Arrangement for the compensation of damaging magnetic fields on transverely disposed electrolysis cells Download PDF

Info

Publication number
EP0342033A1
EP0342033A1 EP89304777A EP89304777A EP0342033A1 EP 0342033 A1 EP0342033 A1 EP 0342033A1 EP 89304777 A EP89304777 A EP 89304777A EP 89304777 A EP89304777 A EP 89304777A EP 0342033 A1 EP0342033 A1 EP 0342033A1
Authority
EP
European Patent Office
Prior art keywords
cells
row
current
cell
compensation
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.)
Granted
Application number
EP89304777A
Other languages
German (de)
French (fr)
Other versions
EP0342033B1 (en
Inventor
Hans Georg Tidemann Nebell
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.)
Norsk Hydro ASA
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
Publication of EP0342033A1 publication Critical patent/EP0342033A1/en
Application granted granted Critical
Publication of EP0342033B1 publication Critical patent/EP0342033B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • This invention relates to a potline for the electrolytic production of aluminium which provides compensation for the unwanted electromagnetic influence from the rectifier and the end cells of the potline.
  • a typical arrangement of the aluminium electrolytic cells is to position the cells transversely in rows with the electric current being conducted from one cell to the next and from one row to the next. The direction of the current in one row will be opposite to the current direction in the neighbouring row.
  • the present electrolytic process utilizes a current of 200 to 300 kA. This current induces large magnetic fields affecting the neighbouring rows and cells causing great problems because the magnetic fields influence the molten metal forming the cathode in the bottom of each cell.
  • the distance between two rows of cells in a potline is normally such that the only effect on the neighbouring row will be the vertical component of the magnetic field.
  • a higher current is normally passed around or under the short end facing the neighbouring row rather than to other parts of the transversely arranged electrolysis cells.
  • the first and last cell (end cells) of every row are the cells which are most exposed to the electromagnetic field, because they are influenced by the magnetic field both from the neighbouring row and from the busbars conducting the current from one end of the potline area back to the rectifier and, at the other end, conducting the current from one row to the next (between the end cells).
  • This influence can be reduced by increasing the distance between the rectifier and the potline, and by increasing the distance from the last cell in a row to the transverse busbar leading the current to the neighbouring row. This is however an expensive method, giving unnecessary long busbars and requiring a large area.
  • a potline for the electrolytic production of aluminium comprises at least two rows of reduction cells with the cells arranged tranversely in each row and is characterised in that the electric current is conducted to and from the end cells by three or more asymmetrically arranged supply bars via a distribution bar on each end cell, so that a net current is formed in the distribution bar, providing compensation for the magnetic influence from the rectifier field and end cell field.
  • This arrangement reduces the installation costs by reducing the busbar length and saves space by reducing the distance between the rectifier and the potline at one end and between the transverse busbar and the potline at the other end of the potline.
  • the drawing illustrates the end cells of the row of cells and not the whole row of cells. It is also understood that by using well-known technology the rows per se are stabilized with respect to influence from the neighbouring row.
  • Electric current from the rectifier L is carried in three or more supply bars T to the first end cells in row 1, and is connected asymmetrically to a distribution bar A comprising four or more risers S being symetrically positioned with respect to the cell.
  • This arrangement will give a net electric current in the distribution bar A conducted from right to left and provides compensation for the first end cell in row 1.
  • the electric current is thereafter conducted from the cathode of an upstream cell to the anode of the next downstream cell, as normal, and to the other end cell in row 1.
  • the electric current is conducted from this second end cell to a distribution bar B.
  • the current is then conducted from the distribution bar to the first cell in the neighbouring row 2 seen in the current direction via three or more supply bars T asymmetrically positioned with respect to the midpoint of the distribution bar B.
  • This arrangement gives a net current in the distribution bar B from left to right and provides the necessary extra compensation for this other end cell in row 1.
  • the electric current is further conducted to a distribution bar C on the first cell in the row 2 by means of asymmetrically arranged supply bars T. Thereafter the current is conducted from the cathode of an upstream cell to the anode of the next downstream cell, as normal, to the other end cell in the row 2. From this other end cell in row 2 the current is conducted to a distribution bar D. The current is then conducted via three or more supply bars T, being asymmetrically arranged with respect to the midpoint of the distribution bar D, back to the rectifier L, as illustrated in the drawing.

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)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

A potline for the electrolytic production of aluminium comprising at least two rows of reduction cells (1 and 2) with the cells arranged transversely in each row. The electric current is conducted to and from the end cells by three or more asymmetrically arranged supply bars (T) via a distribution bar (A,B,C,D) on each end cell, so that a net current is formed in the distribution bar, providing compensation for the magnetic influence from the rectifier field and end cell field.

Description

  • This invention relates to a potline for the electrolytic production of aluminium which provides compensation for the unwanted electromagnetic influence from the rectifier and the end cells of the potline.
  • It is of great importance for the economical production of aluminium by electrolysis that the electrical energy is used in the most efficient way. It is also very important that the various parts of the busbar arrangement, which conducts the current from the rectifier to the first electrolytic cell in the row, from the last cell in said row to the first cell in the neighbouring row and then from the last cell to the rectifier, are positioned so as to minimize the magnetic field induced in the cells.
  • A typical arrangement of the aluminium electrolytic cells is to position the cells transversely in rows with the electric current being conducted from one cell to the next and from one row to the next. The direction of the current in one row will be opposite to the current direction in the neighbouring row.
  • The present electrolytic process utilizes a current of 200 to 300 kA. This current induces large magnetic fields affecting the neighbouring rows and cells causing great problems because the magnetic fields influence the molten metal forming the cathode in the bottom of each cell.
  • The distance between two rows of cells in a potline is normally such that the only effect on the neighbouring row will be the vertical component of the magnetic field. To compensate for the unwanted or bias field component caused by the neighbouring row, a higher current is normally passed around or under the short end facing the neighbouring row rather than to other parts of the transversely arranged electrolysis cells.
  • The first and last cell (end cells) of every row are the cells which are most exposed to the electromagnetic field, because they are influenced by the magnetic field both from the neighbouring row and from the busbars conducting the current from one end of the potline area back to the rectifier and, at the other end, conducting the current from one row to the next (between the end cells). This influence can be reduced by increasing the distance between the rectifier and the potline, and by increasing the distance from the last cell in a row to the transverse busbar leading the current to the neighbouring row. This is however an expensive method, giving unnecessary long busbars and requiring a large area.
  • A potline for the electrolytic production of aluminium, in accordance with the invention, comprises at least two rows of reduction cells with the cells arranged tranversely in each row and is characterised in that the electric current is conducted to and from the end cells by three or more asymmetrically arranged supply bars via a distribution bar on each end cell, so that a net current is formed in the distribution bar, providing compensation for the magnetic influence from the rectifier field and end cell field.
  • This arrangement reduces the installation costs by reducing the busbar length and saves space by reducing the distance between the rectifier and the potline at one end and between the transverse busbar and the potline at the other end of the potline.
  • The invention will now be explained in detail by way of example, with reference to the accompanying drawing illustrating a potline according to the invention.
  • The drawing illustrates the end cells of the row of cells and not the whole row of cells. It is also understood that by using well-known technology the rows per se are stabilized with respect to influence from the neighbouring row.
  • Electric current from the rectifier L is carried in three or more supply bars T to the first end cells in row 1, and is connected asymmetrically to a distribution bar A comprising four or more risers S being symetrically positioned with respect to the cell. This arrangement will give a net electric current in the distribution bar A conducted from right to left and provides compensation for the first end cell in row 1. The electric current is thereafter conducted from the cathode of an upstream cell to the anode of the next downstream cell, as normal, and to the other end cell in row 1.
  • The electric current is conducted from this second end cell to a distribution bar B. The current is then conducted from the distribution bar to the first cell in the neighbouring row 2 seen in the current direction via three or more supply bars T asymmetrically positioned with respect to the midpoint of the distribution bar B. This arrangement gives a net current in the distribution bar B from left to right and provides the necessary extra compensation for this other end cell in row 1.
  • The electric current is further conducted to a distribution bar C on the first cell in the row 2 by means of asymmetrically arranged supply bars T. Thereafter the current is conducted from the cathode of an upstream cell to the anode of the next downstream cell, as normal, to the other end cell in the row 2. From this other end cell in row 2 the current is conducted to a distribution bar D. The current is then conducted via three or more supply bars T, being asymmetrically arranged with respect to the midpoint of the distribution bar D, back to the rectifier L, as illustrated in the drawing.
  • It is obvious that the dimensioning and positioning of the distribution bars, the risers and the supply bars in the rectifier field and end field will determine the current intensity in the distribution bar, and the level of compensation for the end cells.
  • The practical arrangment of the invention will be solved by normal construction procedures, with respect to the numerous factors and conditions which are considered when building and planning an aluminium potline with a high current intensity and reduced magnetic field. Normally, only the end cells in a potline with a current above 200 kA need extra compensation.

Claims (1)

1. A potline for the electrolytic production of aluminium comprising at least two rows of reduction cells with the cells arranged transversely in each row, characterized in that the electric current is conducted to and from the end cells by three or more asymmetrically arranged supply bars (T) via a distribution bar (A,B,C,D) on each end cell, so that a net current is formed in the distribution bar, providing compensation for the magnetic influence from the rectifier field and end cell field.
EP89304777A 1988-05-11 1989-05-11 Arrangement for the compensation of damaging magnetic fields on transverely disposed electrolysis cells Expired - Lifetime EP0342033B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO882083 1988-05-11
NO882083A NO164787C (en) 1988-05-11 1988-05-11 DEVICE FOR COMPENSATION OF DAMAGING MAGNETIC EFFECT FROM LIKE RIGHT FIELD AND ENDFIELD ON TRANSFERRED ELECTROLYE OVEN IN MOLDING ELECTROLYTIC PRODUCTS OF ALUMINUM.

Publications (2)

Publication Number Publication Date
EP0342033A1 true EP0342033A1 (en) 1989-11-15
EP0342033B1 EP0342033B1 (en) 1992-09-30

Family

ID=19890880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89304777A Expired - Lifetime EP0342033B1 (en) 1988-05-11 1989-05-11 Arrangement for the compensation of damaging magnetic fields on transverely disposed electrolysis cells

Country Status (9)

Country Link
EP (1) EP0342033B1 (en)
CN (1) CN1051810C (en)
AU (1) AU609606B2 (en)
BR (1) BR8902189A (en)
DE (1) DE68903033T2 (en)
ES (1) ES2036030T3 (en)
NO (1) NO164787C (en)
NZ (1) NZ228965A (en)
RU (1) RU2060304C1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2868436A1 (en) * 2004-04-02 2005-10-07 Aluminium Pechiney Soc Par Act SERIES OF ELECTROLYSIS CELLS FOR THE PRODUCTION OF ALUMINUM COMPRISING MEANS FOR BALANCING THE MAGNETIC FIELDS AT THE END OF THE FILE
WO2017064547A1 (en) 2015-10-15 2017-04-20 Rio Tinto Alcan International Limited Series of electrolysis cells for the production of aluminium comprising means for balancing the magnetic fields at the end of the line
CN110029357A (en) * 2018-12-20 2019-07-19 沈阳北冶冶金科技有限公司 A kind of cell room and electrolytic cell layout structure of potline

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2457363C (en) * 2001-08-09 2009-07-28 Alcoa Inc. Component cathode collector bar
CN100439566C (en) * 2004-08-06 2008-12-03 贵阳铝镁设计研究院 Five power-on bus distributing style with different current
CN101748443B (en) * 2008-12-09 2012-05-23 贵阳铝镁设计研究院有限公司 Configuration method and structure of aluminum electrolysis cell cathode bus with two-point-end power-on mode
FR2977898A1 (en) * 2011-07-12 2013-01-18 Rio Tinto Alcan Int Ltd ALUMINERY COMPRISING CATHODIC EXIT TANKS THROUGH THE BOTTOM OF THE HOUSING AND TANK STABILIZATION MEANS
CN103114307B (en) * 2011-11-16 2015-11-04 沈阳铝镁设计研究院有限公司 Aluminium cell external compensation power-supply rectifying unit aluminium busbar method for arranging and system
CN105579114B (en) * 2013-09-25 2018-01-02 林德股份公司 The method for purifying the cracking air-flow in oil scrubbing tower
GB2557972A (en) * 2016-12-21 2018-07-04 Dubai Aluminium Pjsc Electrical design for a Hall-Héroult electrolysis plant comprising a plurality of electrolytic cells connected in series, and method to start-up said plant
RU2678624C1 (en) * 2017-12-29 2019-01-30 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Modular busbar for series of aluminum electrolysis cells

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2139527A1 (en) * 1971-01-27 1972-08-31 Vni I Projek Rail system of electrolysis plants for the production of aluminum
US3756938A (en) * 1970-06-25 1973-09-04 Ardal Og Sunndal Verk Tion on a row of pots from another instance aluminum by electrolytic reducconductor arrangement for compensating detrimental magnetic influence
EP0185822A1 (en) * 1984-12-28 1986-07-02 Alcan International Limited Busbar arrangement for aluminium electrolytic cells

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756938A (en) * 1970-06-25 1973-09-04 Ardal Og Sunndal Verk Tion on a row of pots from another instance aluminum by electrolytic reducconductor arrangement for compensating detrimental magnetic influence
DE2139527A1 (en) * 1971-01-27 1972-08-31 Vni I Projek Rail system of electrolysis plants for the production of aluminum
EP0185822A1 (en) * 1984-12-28 1986-07-02 Alcan International Limited Busbar arrangement for aluminium electrolytic cells

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2868436A1 (en) * 2004-04-02 2005-10-07 Aluminium Pechiney Soc Par Act SERIES OF ELECTROLYSIS CELLS FOR THE PRODUCTION OF ALUMINUM COMPRISING MEANS FOR BALANCING THE MAGNETIC FIELDS AT THE END OF THE FILE
WO2005098094A2 (en) * 2004-04-02 2005-10-20 Aluminium Pechiney Series of electrolysis cells for the production of aluminium comprising means for equilibration of the magnetic fields at the ends of the lines
WO2005098094A3 (en) * 2004-04-02 2006-06-29 Pechiney Aluminium Series of electrolysis cells for the production of aluminium comprising means for equilibration of the magnetic fields at the ends of the lines
US7513979B2 (en) 2004-04-02 2009-04-07 Aluminium Pechiney Series of electrolysis cells for the production of aluminium comprising means for equilibration of the magnetic fields at the ends of the lines
AU2005232011B2 (en) * 2004-04-02 2009-08-13 Aluminium Pechiney Series of electrolysis cells for the production of aluminium comprising means for equilibration of the magnetic fields at the ends of the lines
CN100570010C (en) * 2004-04-02 2009-12-16 皮奇尼铝公司 Group of electrolytic cells for the production of aluminum comprising means for equalizing the magnetic field at both ends of the production line
WO2017064547A1 (en) 2015-10-15 2017-04-20 Rio Tinto Alcan International Limited Series of electrolysis cells for the production of aluminium comprising means for balancing the magnetic fields at the end of the line
RU2722026C2 (en) * 2015-10-15 2020-05-26 Рио Тинто Алкан Интернэшнл Лимитед Series of electrolytic cells for producing aluminum, comprising means for balancing the magnetic fields at the end of the row
CN110029357A (en) * 2018-12-20 2019-07-19 沈阳北冶冶金科技有限公司 A kind of cell room and electrolytic cell layout structure of potline
CN110029357B (en) * 2018-12-20 2024-02-23 沈阳北冶冶金科技有限公司 Electrolysis factory building and electrolysis trough overall arrangement structure of aluminium cell series

Also Published As

Publication number Publication date
AU609606B2 (en) 1991-05-02
ES2036030T3 (en) 1993-05-01
DE68903033D1 (en) 1992-11-05
DE68903033T2 (en) 1993-04-15
RU2060304C1 (en) 1996-05-20
NO882083D0 (en) 1988-05-11
NO164787B (en) 1990-08-06
CN1037747A (en) 1989-12-06
NO164787C (en) 1990-11-14
AU3460789A (en) 1989-11-16
NZ228965A (en) 1991-02-26
EP0342033B1 (en) 1992-09-30
CN1051810C (en) 2000-04-26
NO882083L (en) 1989-11-13
BR8902189A (en) 1990-01-02

Similar Documents

Publication Publication Date Title
EP0342033B1 (en) Arrangement for the compensation of damaging magnetic fields on transverely disposed electrolysis cells
US4072597A (en) Method and apparatus for compensating the magnetic fields in adjacent rows of transversely arranged igneous electrolysis cells
AU2007201714A1 (en) A device for compensating a magnetic field induced in a linearly arranged series of electrolysis cells by an adjacent generally parallel line of cells
RU2386730C2 (en) Method and systems of electric connection and magnetic compensation of aluminium electrolysis baths
US4169034A (en) Means of compensating the magnetic field induced by the adjacent line in series of high intensity electrolysis cells
US3756938A (en) Tion on a row of pots from another instance aluminum by electrolytic reducconductor arrangement for compensating detrimental magnetic influence
CA1098864A (en) Arrangement for compensating for detrimental magnetic influence between two or more rows of transverse electrolytic pots or cells for producing aluminum, by electrolytic reduction
AU693391B2 (en) Busbar arrangement for electrolytic cells
GB794421A (en) Improvements in or relating to electrolytic cells
CA1232868A (en) Arrangement of busbars for electrolytic reduction cell
KR850001537B1 (en) How to eliminate magnetic disturbance in a row-type high current electrolytic cell for electrolytic production of aluminum
EP0345959B1 (en) Arrangement of busbars on large, transversely disposed electrolysis cells
US4396483A (en) Arrangement of busbars for electrolytic reduction cells
HU182056B (en) System of current conducting bus bars for electrolizing celss at making aluminum
CN110029357B (en) Electrolysis factory building and electrolysis trough overall arrangement structure of aluminium cell series
CN1938455A (en) Series of electrolysis cells for the production of aluminium comprising means for equilibration of the magnetic fields at the ends of the lines
US4176037A (en) Conductor arrangement for compensating for horizontal magnetic fields in pots containing a molten electrolytic bath
EP0371653A1 (en) Busbar arrangement for transversely disposed electrolysis cells
US4431492A (en) Aluminum electrolytic cell arrays and method of supplying electric power to the same
RU2168564C2 (en) Compensation device
RU2164557C2 (en) Busbars system of aluminium cell
AU555468B2 (en) Electrolytic reduction cell with elongated barrier members on cell floor
AU2003100935A4 (en) Busbar system for aluminium electrolytic cell
KR800001344B1 (en) Magnetic field compensation device in adjacent rows of molten electrolytic cell arranged sideways
RU2187584C2 (en) Gear to supply power to aluminum electrolyzers connected in series

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT

17P Request for examination filed

Effective date: 19900203

17Q First examination report despatched

Effective date: 19910610

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

REF Corresponds to:

Ref document number: 68903033

Country of ref document: DE

Date of ref document: 19921105

ITF It: translation for a ep patent filed
ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2036030

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020508

Year of fee payment: 14

Ref country code: FR

Payment date: 20020508

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020516

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20020522

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030511

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030512

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20031202

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20030511

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030512

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050511