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On-line identification method for concentration signal of aluminum oxide in electrolyte in aluminum electrolysis cell

A technology of inner electrolyte and aluminum electrolytic cell, which is applied in the field of online identification of alumina concentration signal in the electrolyte of aluminum electrolytic cell, which can solve the problems of limited sensor life, high requirements for equivalent circuit selection, error, etc., to reduce the anode effect coefficient, improve current efficiency, and realize the effect of stable operation

Inactive Publication Date: 2011-11-02
NORTHEASTERN UNIV
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Problems solved by technology

The sensor method is to insert the electrodes directly into the electrolyte, and determine the alumina content according to the electromotive force between the electrodes, but the life of the sensor is very limited, and the continuous measurement of the alumina concentration cannot be realized, and it cannot be used in the control system of the aluminum electrolytic cell; the frequency response method is based on the electrolytic cell The capacitive reactance is used to estimate the concentration of alumina, but there are large errors in this measurement method, and the requirements for the selection of the equivalent circuit are very high. At the same time, this method is not suitable for complex industrial environments. When the electrolytic parameters change, the equivalent circuit cannot be used to estimate the alumina concentration

Method used

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  • On-line identification method for concentration signal of aluminum oxide in electrolyte in aluminum electrolysis cell
  • On-line identification method for concentration signal of aluminum oxide in electrolyte in aluminum electrolysis cell
  • On-line identification method for concentration signal of aluminum oxide in electrolyte in aluminum electrolysis cell

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Embodiment 1

[0027] In a 200kA prebaked aluminum electrolysis series in an aluminum plant, 1# and 2# electrolytic cells were selected to identify the alumina concentration, and the anode was lifted every 3 hours, and the voltage change data of the cell was recorded to identify the alumina concentration, and the electrolyte was sampled , to analyze the alumina concentration in the electrolyte. The anode moves about 4mm, the process lasts for 2 minutes, record △L 1 、△R 1 , electrolyte sampling analysis alumina concentration C 1 , restore the polar distance; after a period of time, raise the anode again about 4mm, last for 2 minutes, and record △L 2 、△R 2 , electrolyte sampling analysis alumina concentration C 2 , restore the pole distance, and calculate the calibration constant k 1 、k 2 . 1# slot record result:

[0028] △L 1 △R 1 C 1 △L 2 △R 2 C 2 0.4121cm 5.06×10 -7 Ω 3.08% 0.4803cm 5.89×10 -7 Ω 3.14%

[0029] Then, 1# slot

[0030]

[0...

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Abstract

The invention relates to an on-line identification method for a concentration signal of aluminum oxide in an electrolyte in an aluminum electrolysis cell, and relates to an on-line identification method for a concentration signal of aluminum oxide for controlling the charging quantity of the aluminum oxide in the aluminum electrolysis production process. The method is characterized in that: in the on-line identification process, polar distance is used as an excitation signal, and the concentration of the aluminum oxide is identified by a response signal of cell resistance in the adjustment process of the polar distance. The method has the advantages of high identification speed, small influence on the condition of the electrolysis cell and the like, the accurate control over the blanking of the aluminum oxide can be realized, anode effect coefficients can be reduced effectively, current efficiency can be improved, the stable running of the electrolysis cell can be realized, and energyconsumption can be reduced.

Description

technical field [0001] The invention relates to an on-line identification method of the alumina concentration signal in the electrolyte in an aluminum electrolytic cell, which is used for the on-line identification method of the alumina concentration signal for the control of the alumina feeding amount in the aluminum electrolysis production process. Background technique [0002] Due to the nonlinear, time-varying, and large hysteresis characteristics of the aluminum electrolytic cell, the internal cell conditions of the aluminum electrolytic cell are very complex, in a high temperature, strong corrosive environment, and strong electric fields, strong magnetic fields, and strong thermal fields interfere with each other. Currently, only the cell voltage and series current can be continuously collected online. The apparent cell resistance signal calculated from the cell voltage and series current is the only signal reflecting the state of the cell that can be obtained onlin...

Claims

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Application Information

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IPC IPC(8): C25C3/20
Inventor 李斌川陈建设孙树臣翟秀静涂赣峰刘奎仁韩庆
Owner NORTHEASTERN UNIV
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