Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1998-04-30
2000-10-17
Valentine, Donald R.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C25C 300
Patent
active
061325716
ABSTRACT:
An aluminum reduction cell system includes a cell controller to monitor and control an associated aluminum reduction cell. The cell controller measures a cell voltage output from the cell and a bus current signal input to the cell, and computes impedance from the measured cell voltage and current. An anode effect predictor is incorporated into the cell controller to predict when the aluminum reduction cell is about to experience an anode effect. The anode effect predictor applies a higher-order statistical function to the cell impedance data to produce a spectrum representative of the cell's behavior. The statistical function is, for example, a third-order coherence function of the impedance data, which is one order higher than a second-order power spectrum. The coherence function captures correlation or interdependence between the samples that make up the power spectrum. The higher-order spectrum exhibits different patterns or "footprints" that change as the cell transitions from steady state to an anode effect condition. The anode effect predictor detects the changing spectrum patterns as a means for determining an oncoming anode effect. When an impending anode effect is detected, the anode effect predictor informs the cell controller, which then takes steps to minimize the impact of an upcoming anode effect.
REFERENCES:
patent: 3578569 (1971-05-01), Lewis
patent: 4230540 (1980-10-01), Archer et al.
patent: 4425201 (1984-01-01), Wilson et al.
Aralbayeva and Sarychev, "Prediction from Spectral Characteristics Based on the GMDH Algorithm of the Anode Effect in an Aluminum Electrolyzer", 1988, pp. 39-45 no month.
Derwent Publications Ltd, "Aluminum Electrolyzer Anode Effect Predictor--Determines Dorrelation Function Between Smoother Cell Voltage and Voltage Harmonics Intensity", 1989 no month.
Mendel, Jerry M., "Tutorial on Higher-Order Statistics (Spectra) in Signal Processing and System Theory: Theoretical Results and Some Applications", Proc. IEEE 79 (3), pp. 278-305 no date available.
Nikias, Chrysostomos L., et al., "Higher Order Spectra Analysis: A Nonlinear Signal Processing Framework", Prentice-Hall, Englewood Cliffs, NJ, 1993, ISBN 0-13-678210-8 no month available.
Meyer et al. "Anode Effect Prediction." Light Met. (Warrendale, Pa.) 2, 365-70, 1986.
"Prediction of the Anode Effect and It's Role in Process Control of Aluminum Electrolyzers With Self-Baking Anodes," Banyasz. Kohasz. Lapok, Kohasz, 122(2), 78-82, 1989.
Meghlaoui et al., Nueral Networks for Control of Electrolytic Cells. Light Met. 1996, Proc. Int. Symp. 453-65, 1996.
Aralbayeve et al. "Prediction From Spectral Characteristics Based on the GMOH Algorithim of the Anode Effect in an Aluminum Electrolyzer," Sov. J. Autom. Inf. Sci. v. 20, N.6, pp. 39-45, Nov. 1987.
Kaiser Aluminum and Chemical Corporation
Valentine Donald R.
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