Chemistry: electrical and wave energy – Processes and products
Patent
1987-11-18
1989-03-21
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204245, C25C 306
Patent
active
048140503
ABSTRACT:
A method of estimating and controlling the concentration of alumina in the bath of a Hall cell. The method includes the use of an estimator that employs two sets of equations, namely, a time update algorithm that contains a dynamic model of the alumina mass balance of the cell and provides estimates of alumina concentration, and a measurement algorithm that uses a process feedback variable from the cell to modify the alumina estimate. In addition, the method includes the use of one or more tuning parameters, such as state noise variance and measurement noise variance. The measurement noise variance is modified by the process noise variance in a manner that increases measurement noise variance for high values of process noise and decreases measurement noise variance for low values of process noise. In addition, one or more of the parameters of the model are modified by the feed history of the cell.
REFERENCES:
patent: 3622475 (1971-11-01), Shiver
patent: 3625842 (1971-12-01), Bristol
patent: 4488117 (1984-12-01), Seo
"A Multi-Variable Control in Aluminum Reduction Cells", Erik Gran, 1980, Modeline, Identification and Control (vol. 1, No. 4, pp. 247-258).
"Adaptive Control of Aluminum Reduction Cells with Point feeders", T. Moen, J. Aalbu, and T. Boy.
"Estimation of States in Aluminum Reduction Cells Applying Extended Kalman Filtering Algouthm Together with a Nonlinear Dynamic Model and Direct Measurements", K. Vee and E. Gran.
Christian Kevin G.
Hall William M.
Kozarek Robert L.
McGraw William D.
Miller Gene S.
Aluminum Company of America
Hsing Ben C.
Niebling John F.
Strickland Elroy
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