C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/49.5
C25C 3/14 (2006.01) C25C 3/20 (2006.01) G05B 13/04 (2006.01)
Patent
CA 1304040
ABSTRACT Method for controlling the alumina feed to reduc- tion cells for the production of aluminium. There is employed an adaptive control with parameter estimation (3) and con-troller calculation (2) based upon the sepa- ration theorem. As a process model there is used a linear model having two inputs and one output. One input (u1) is in the form of alumina feeding minus as- sumed alumina consumption. Another input (u2) is in the form of movements of the reduction cell anode. The output (y) is in the form of the change in elec- tric resistance across the reduction cell concerned. The model is of the first order in u1 and u2 whereas it is of the order zero in y. An estimated parameter (b1) represents the slope of the curve for resistance as a function of alumina concentration in the electro- lytic bath, and the controller (2) controls the addi- tion of alumina to the electrolytic bath in response to the value of b1.
502303
Aalbu Johannes
Aalbu Marit Stangeland
Borg Peter
Moen Tom
Ardal Og Sunndal Verk A.s.
Fetherstonhaugh & Co.
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