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1. WO1991005889 - BUSBAR ARRANGEMENT FOR ALUMINUM ELECTROLYTIC CELLS

Nota: O texto foi obtido por processos automáticos de reconhecimento ótico de caracteres.
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CLAIMS :
1. An aluminum electrolysis cell (10) having opposed longitudinal side walls and opposed end walls, a lining for containing cell contents including a molten metal pad (17) , cathode collector bars (11, 12) extending through the lining, and cathode collector bar ends extending from each of said longitudinal side walls, characterized in that at least one generally horizontal current collector busbar (15A-15D, 16A-16D) extends along each longitudinal side wall and has a horizontal axis at substantially the vertical level of said metal pad (17) , in that connectors

(13, 14) are provided for connecting said cathode collector bar ends to said collector busbars and in that a plurality of current taps (18A-18D, 19A-19D) are provided at points spaced along each of said longitudinal side walls for removing current from said collector busbars, said current taps being connected to said collector busbars in such positions that current flows through said collector busbars in opposite longitudinal directions on opposite longitudinal sides of each of said taps.
2. A cell according to Claim 1 characterized by at least three current taps (18A-18D, 19A-19D) per longitudinal cell side.
3. A cell according to Claim 1 characterized by four current taps (18A-18D, 19A-19D) per longitudinal cell side.

4. A cell according to Claim 1, Claim 2 or Claim 3 characterized in that said current taps (18A-18D, 19A-19D) lead current vertically downwardly from said collector busbars
(15A-15D, 16A-16D) .
5. A cell according to Claim 1, Claim 2 or Claim 3 characterized by a single collector busbar (15A-15D, 16A-16D) extending along each longitudinal side of said cell.

6. A cell according to Claim 1, Claim 2 or Claim 3 characterized by a plurality of collector busbars (15A-15D,

16A-16D) extending in substantial horizontal alignment along each longitudinal side of said cell.
7. A cell according to Claim 1, Claim 2 or Claim 3 characterized by four collector busbars (15A-15D, 16A-16D) extending along each longitudinal side of said cell, each said collector busbar being connected to a separate current tap (18A-18D, 19A-19D) at approximately the central point of the collector busbar.
8. A cell according to Claim 1, Claim 2 or Claim 3 characterized in that said connectors (13, 14) for connecting each of said collector bar ends to said collector busbars extend generally vertically.
9. A cell according to Claim 1, Claim 2 or Claim 3, characterized by a plurality of anode risers (25A-25D) equal in number to said current taps (18A-18D, 19A-19D) and positioned at intervals in the longitudinal direction of the cell, said anode risers being positioned such that their vertical axes are generally in alignment .in the transverse direction of the cell with central points of said current taps.
10. A pair of adjacent cells according to Claim 1, Claim 2 or Claim 3 characterized by an element (20) extending between said cells having opposite transverse ends supported by current collector busbars (15A-15D, 16A-16D) on said adjacent cells to form a working floor.
11. An aluminum electrolysis cell having opposed longitudinal side walls and opposed end walls, a lining for containing cell contents including a molten metal pad (17), cathode collector bars (11, 12) extending through the lining, cathode collector bar ends extending from said longitudinal side walls, generally horizontal collector busbars (15A-15D, 16A-16D) extending along said side walls for collecting current from said collector bar ends and additional busbar runs (26-31) for removing current from said collector busbars, characterized in that said additional busbar runs include vertically disposed current taps (18A-18D, 19A-19D) for conveying current from said collector busbars vertically downwardly to a vertical level below said metal pad (17) to limit magnetic influences from said additional busbar runs on said metal pad.
12. A cell according to Claim 11 characterized in that longitudinal axes of said collector busbars (11, 16) are positioned at substantially the same height as said metal pad (17) .
13. A cell according to Claim 11 characterized in that a plurality of vertical current taps (18A-18D, 19A-19D) are provided for each longitudinal side of said cell.
14. A cell according to Claim 11, Claim 12 or Claim 13 characterized in that said additional busbar runs (26-31) connect said cell to anode risers (25A-25D) of an adjacent cell.
15. An arrangement of busbars and anode risers between adjacent aluminum electrolysis cells (10) in a row of such cells, each cell of the row being generally rectangular with opposed longitudinal side walls and opposed ends and being substantially symmetrical about a central transverse axis, the cells being arranged in said row with the transverse axes thereof substantially' in alignment, each cell having upstream and downstream cathode collector bars (11, 12) and at least one anode beam (46) ; characterized in that said arrangement of busbars and anode risers comprises, with respect to the cell halves on one side of the transverse axes:
at least two anode risers (25A-25B) for each cell half, the anode risers being connected to said at least one anode beam (46) of each cell half at points spaced along said beam so that each cell half has' an anode riser closer to the longitudinal end of the cell half and an anode riser closer to the centre of the cell; and
at least two busbars (15A,15B) connecting the upstream collector bars (11) of an upstream cell half with the anode risers (25A,25B) of an adjacent downstream cell half; a first one of said busbars (15B) connecting a group of said upstream collector bars adjacent to the centre of said upstream cell to the anode riser (25A) closer to the longitudinal end of the downstream cell and passing around the longitudinal end of said upstream cell half; and a second one of said busbars (15A) connecting a group of said collector bars of said upstream cell half adjacent to the longitudinal end of the cell half to the anode riser (25B) of the downstream cell half closer to the centre of the downstream cell half and passing beneath the upstream cell half;
said first busbar (15B) including a first elongated horizontal run (27B) extending transversely of the row between the respective cell half and an adjacent upstream cell half at a vertical level below said collector bars;
said second busbar (15A) including a second elongated horizontal run (29A) extending transversely of the rov/ between the respective cell half and an adjacent downstream cell half at a vertical level below said collector bars;
said first and second elongated horizontal runs (27B, 29A) of adjacent cells being positioned such that said elongated runs lie in closely spaced generally parallel relationship to each other and being orientated such that the current flows through a first elongated run in a direction opposite to that in which current flows through an adjacent second elongated run.
16. An arrangement according to Claim 15 characterized in that said first and second elongated horizontal runs (27B,

29A) are positioned adjacent to the mid vertical plane between adjacent cells.
17. An arrangement according to Claim 15 characterized by two anode risers (25A, 25B) and two busbars (15A, 15B) per cell half.
18. An arrangement according to Claim 15, Claim 16 or Claim 17 characterized in that said adjacent first and second elongated runs (27B, 29A) are of substantially the same length.
19. An arrangement according to Claim 15, Claim 16 or Claim 17 characterized in that said adjacent first and second runs (27B, 29A) carry currents that are substantially equal.
20. .An arrangement according to Claim 15, Claim 16 or Claim 17 characterized in that said adjacent first and second runs (27B, 29A) are positioned so close to each other that the induced vertical magnetic fields from the runs substantially cancel each other.
21. An arrangement according to Claim 15, Claim 16 or Claim 17 characterized in that said first busbar (15B) includes a round end run (28B, 29B, 3OB) which extends partly at a vertical level below said metal pad (17) and partly at a level substantially the same as said metal pad with a generally vertical connection (29B) therebetween.

22. An arrangement according to Claim 15, Claim 16 or Claim 17 characterized in that said second busbar extends under the cell half at a point in the cell half adjacent the longitudinal end thereof.
23. An arrangement according to Claim 15, Claim 16 or Claim 17 characterized in that said second busbar divides into two electrically parallel runs (27A, 28A) which are reconnected prior to the connection of the second busbar to an anode riser (25A) , the routes of said parallel runs being such that undesired vertical magnetic effects on said cell are minimized.
24. An arrangement according to Claim 15, characterized in that said at least two busbars include at least two current collector busbars (15A-15D, 16A-16D) extending along each longitudinal side wall, and having a horizontal axis at substantially the vertical level of said metal pad (17) and a plurality of current taps (18A-18D, 19A-19D) at points spaced along each of said longitudinal side walls for removing current from said collector busbars, said current taps being connected to said collector busbars in such positions that current flows through said collector busbars in opposite longitudinal ■ directions on opposite longitudinal sides of each of said taps.
25. An arrangement according to Claim 24 characterized in that said current taps (18A-18D, 19A-19D) are generally vertically disposed so that current conveyed by said taps flows vertically downwardly to a vertical level below said metal pad (17) to limit magnetic influences of said current on said metal pad.
26. An arrangement according to Claim 15, Claim 24 or Claim 25 characterized in that groups of downstream collector bars are connected to adjacent anode risers by means of vertically folded busbars.
27. An arrangement of busbars and anode risers between adjacent aluminum electrolysis cells (10) in a row of such cells each cell of the row being generally rectangular with opposed longitudinal side walls and opposed ends and being substantially symmetrical about a central transverse axis, the cells being arranged in said row with the transverse axes thereof substantially in alignment, each cell having upstream and downstream cathode collector bars (11, 12) and at least one anode beam (46) ; characterized in that said arrangement of busbars and anode risers comprises, with respect to the cell halves on one side of the transverse axis:
at least two anode risers (25A, 25B) for each cell half, the anode risers being connected to said at least one anode beam (46) of each cell half at points spaced along said beam so that each cell half has an anode riser (25A) closer to the longitudinal end of the cell half and ah anode riser (25B) closer to the centre of the cell; and at least two busbars (15A,15B) connecting the upstream collector bars of an upstream cell half with the anode risers (25A,25B) of an adjacent downstream cell half; a first one of said busbars (15B) connecting a group of said upstream collector bars (11) adjacent to the centre of said upstream cell to the anode riser (25A) closer to the longitudinal end of the downstream cell and passing around the longitudinal end of said ^upstream cell half; and a second one of said busbars (15A) connecting a group of said collector bars of said upstream cell half adjacent to the longitudinal end of the cell half to the anode riser (25B) of the downstream cell half closer to the centre of the downstream cell half and passing beneath the upstream cell half;
said first busbar including an elongated run (3IB) extending inwardly between said cell half and said cell half next downstream, and said second busbar (15A) including a longitudinal run (15A) adjacent to said end group of current collector bars;
said elongated run (31B) of a first cell half being positioned in close parallel relationship to a longitudinal run (15A1) of said second busbar of a cell half next downstream, said elongated run and said longitudinal run being arranged so that current flows in opposite directions in said runs.