NO900800L - PROCEDURE FOR REGULATING ALUMINUM MELT CELLS. - Google Patents

PROCEDURE FOR REGULATING ALUMINUM MELT CELLS.

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Publication number
NO900800L
NO900800L NO90900800A NO900800A NO900800L NO 900800 L NO900800 L NO 900800L NO 90900800 A NO90900800 A NO 90900800A NO 900800 A NO900800 A NO 900800A NO 900800 L NO900800 L NO 900800L
Authority
NO
Norway
Prior art keywords
cell
resistance
heat
calculation
target
Prior art date
Application number
NO90900800A
Other languages
Norwegian (no)
Other versions
NO900800D0 (en
Inventor
Geoffrey I Blatch
Mark P Taylor
Mark Fyfe
Original Assignee
Comalco Alu
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 Comalco Alu filed Critical Comalco Alu
Publication of NO900800D0 publication Critical patent/NO900800D0/en
Publication of NO900800L publication Critical patent/NO900800L/en

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  • Electrolytic Production Of Metals (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)

Abstract

Fremgangsmåte for regulering av en alumlnlumsmeltecelle omfattende styring av cellespennlng og -strora, alumlnlumoksydtllsetnlnger, andre tilsetninger, operasjoner og anode til katodeavstandbevegelser, kontinuerlig beregning av cellemotstanden og badets spesifikke motstand fra nevnt styrte cellespennlng og -stram, styring av forekonsten av lavfrekvent og heyfrekvent stay 1 cellespennlngen, kontinuerlig beregning av tldshastlgheten for forandring av motstanden 1 cellen, utelukking av beregning i en forhåndsbestemt tid når det forekommer en aluralnlum- oksydtllsetnlng, annen tilsetning, operasjon eller ACD- bevegelse, etablering av filtrert motstandshelnings- terskler, bestemmelse av om den lavfrekvente steyen er over en forhåndsbestemt terskel, og om så, ekning av de filtrerte helnlngstersklene for lav alumlnlumoksyd- konsentrasjonspåvlsnlng, beregning av en aluminium- oksydbeholdnlng fra aluralnlumtllsetnlngene, bestemmelse av om cellen er overmåtet. og om Ikke, matnlng av aluminiumoksyd for å hindre en anodepåvirknlng, beregning av den varme som tilfares og varme som kreves for aluminlumproduksjon, beregning av den varme som er tilgjengelig for spredning, beregning av raålvarmen for cellen, beregning av forskjellen mellom den tilgjen- gelige varmen og raålvarmen med hensyn på tiden, beregning av en lapende varmebeholdnlng fra Integralet av denne forskjell, etablering av en målmotstand for cellen og modifisering av denne målmotstanden for å oppnå et nullvarmelntegral, sjekking av om målmotstanden er on tillatelig verdi, og bevegelse av anodene 1 cellen for å etablere den nye målmotstanden, beregning av tldshastlgheten for forandring av badets spesifikke motstand og sjekking av om den spesifikke motstanden og derivater er starre enn forhåndsbestemte grenser, og om så, Justering av raålvarmen for cellen for å ved- likeholde den langvarige varmebalansen i cellen.A method of regulating an aluminum melt cell comprising control of cell voltage and current, aluminum oxide counts, other additions, operations and anode for cathode spacer movements, continuous calculation of cell resistance and bath specific resistance of said controlled cell voltage and current voltage and current, cell voltage, continuous calculation of the rate of change of resistance of the cell, exclusion of calculation for a predetermined time when there is an aluminal oxide exposure, other addition, operation or ACD movement, establishment of filtered resistance threshold threshold, determination of filter resistance is above a predetermined threshold, and if so, increasing the filtered saline thresholds for low alumina concentration, calculating an aluminum oxide stock from the alu- minum, determining whether the cell is oversaturated. and if not, alumina feeding to prevent anode influence, calculation of the heat supplied and heat required for aluminum production, calculation of the heat available for dissipation, calculation of the target heat for the cell, calculation of the difference between the available the heat and the target heat with respect to time, calculating a current heat stock from the Integral of this difference, establishing a target resistance for the cell and modifying this target resistance to obtain a zero-heat integral, checking whether the target resistance is of permissible value, and moving the anodes 1 the cell for establishing the new target resistance, calculating the rate of change of the specific resistance of the bath and checking whether the specific resistance and derivatives are stronger than predetermined limits, and if so, Adjusting the target heat for the cell to maintain the long term cell.

NO90900800A 1989-02-24 1990-02-20 PROCEDURE FOR REGULATING ALUMINUM MELT CELLS. NO900800L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU293889 1989-02-24

Publications (2)

Publication Number Publication Date
NO900800D0 NO900800D0 (en) 1990-02-20
NO900800L true NO900800L (en) 1990-08-27

Family

ID=3693431

Family Applications (1)

Application Number Title Priority Date Filing Date
NO90900800A NO900800L (en) 1989-02-24 1990-02-20 PROCEDURE FOR REGULATING ALUMINUM MELT CELLS.

Country Status (1)

Country Link
NO (1) NO900800L (en)

Also Published As

Publication number Publication date
NO900800D0 (en) 1990-02-20

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