Method and apparatus for continuously determining the internal resistance of an electrolysis cell
First Claim
1. A method for continuously determining the internal resistance (R) of an electrolysis cell from the voltage (U) at the terminals of the cell and from the current (I) flowing through the cell, a weak alternating current (if) of frequency (f) being superimposed upon the direct current (I) used for electrolysis, wherein the active part (rf) of the impedance which the cell offers to this alternating current is determined, followed by extrapolation to zero frequency of the function giving the active part (rf) of the impedance as a function of the frequency (f), this active value (rf) thus inclining towards the internal resistance (R) of the cell.
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Abstract
The invention relates to a method of continuously determining the internal resistance of an electrolysis cell and to an apparatus for carrying out this method. In the method according to the invention a weak alternating current (if) of frequency (f) is superimposed upon the electrolysis current, the active part (rf) of the impedance which the cell offers to this alternating current is measured, followed by extrapolation to the zero frequency of the function giving the active part (rf) of the impedance as a function of the frequency (f), (rf) thus inclining towards the internal resistance of the cell. The invention is applicable to any electrolysis cell and more particularly to cells for the igneous electrolysis of alumina.
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Citations
12 Claims
- 1. A method for continuously determining the internal resistance (R) of an electrolysis cell from the voltage (U) at the terminals of the cell and from the current (I) flowing through the cell, a weak alternating current (if) of frequency (f) being superimposed upon the direct current (I) used for electrolysis, wherein the active part (rf) of the impedance which the cell offers to this alternating current is determined, followed by extrapolation to zero frequency of the function giving the active part (rf) of the impedance as a function of the frequency (f), this active value (rf) thus inclining towards the internal resistance (R) of the cell.
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