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Control method for effectively reducing energy consumption of aluminium cell

A technology of an aluminum electrolytic cell and a control method, which is applied in electrolytic components, electrolytic processes, etc., can solve problems such as electrolytic cell swing, unstable operation, and reduced current efficiency, and achieve stable operation, overcome electrolytic cell swing, and reduce energy consumption Effect

Inactive Publication Date: 2008-11-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings of the above-mentioned prior art, and provide a method to overcome the problems of the electrolytic cell swinging after the cell voltage is lowered, the operation cannot be stabilized, and the current efficiency is greatly reduced, so that the electrolytic cell can achieve low energy consumption. Efficient and stable operation control method that can effectively reduce energy consumption of aluminum electrolytic cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 200kA electrolytic cell, the original operating cell voltage is 4.196V, and the electrolysis temperature is 953°C. The voltage is reduced by cleaning fixtures and aluminum guide rods, improving the quality of the anode carbon block and improving the performance of the electrolyte. The first step down, the voltage was lowered by 25mV, and after 3 days of step down, the electrolysis temperature was stable at 948°C; the second step down, the voltage was lowered by 25mV, and after 4 days of step down, the electrolysis temperature was stable at 944°C; the third step down, Reduce the voltage by 25mV, and after 4 days of step-down, the electrolysis temperature is stable at 940°C; the fourth step-down, reduce the voltage by 25mV, and after 3 days of step-down, the electrolysis temperature is stable at 936°C; the fifth step-down, reduce the voltage by 25mV, step-down After 3 days, the electrolysis temperature was stable at 932°C; the sixth step down, the voltage was lowered by 1...

Embodiment 2

[0014] Example 2: 200kA electrolytic cell, the original operating cell voltage is 4.200V, and the electrolysis temperature is 960°C. The voltage is reduced by cleaning the fixtures and aluminum guide rods, improving the quality of the anode carbon block, improving the performance of the electrolyte, improving the performance of the cathode and the condition of the furnace bottom. The first step down, the voltage was lowered by 25mV, and after 4 days of step down, the electrolysis temperature was stable at 956°C; the second step down, the voltage was lowered by 25mV, and after 3 days of step down, the electrolysis temperature was stable at 951°C; the third step down, Reduce the voltage by 25mV, and after 4 days of step-down, the electrolysis temperature is stable at 947°C; after the fourth step-down, the voltage is reduced by 25mV, and after 5 days of step-down, the electrolysis temperature is stable at 943°C; After 3 days, the electrolysis temperature was stable at 938°C; the ...

Embodiment 3

[0017] Example 3: 280kA electrolytic cell, the original operating voltage of the cell is 4.356V, and the electrolysis temperature is 970°C. The voltage is reduced by cleaning the fixtures and aluminum guide rods, improving the quality of the anode carbon block, improving the performance of the electrolyte, improving the performance of the cathode and the condition of the furnace bottom. The first step down, the voltage was lowered by 25mV, and after 4 days of step down, the electrolysis temperature was stable at 966°C; the second step down, the voltage was lowered by 25mV, and after 3 days of step down, the electrolysis temperature was stable at 961°C; the third step down, Reduce the voltage by 25mV, and after 4 days of step-down, the electrolysis temperature is stable at 957°C; after the fourth step-down, the voltage is reduced by 25mV, and after 5 days of step-down, the electrolysis temperature is stable at 953°C; After 3 days, the electrolysis temperature was stable at 948°...

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Abstract

The invention provides a control method for effectively lowering the energy consumption of an aluminum electrolytic bath, relating to an operation method for controlling bath voltage in the process of aluminum electrolysis. The method is characterized in that in the control process, when the electrolytic bath is started and stably runs, the voltage of the electrolytic bath is gradually reduced, each voltage reduction range is between 15 to 25mV, the voltage of the electrolytic bath is continuously reduced until the reduction range of electrolysis temperature is less than or equal to 1 DEG C, or the electrolysis temperature starts to rise, and the normal production is started. In the method of the invention, whether the electrolytic bath can be operated under low voltage is judged according to the changes of the electrolysis temperature, and the electrolytic bath can be stably operated again under the condition of low voltage by matching process engineering conditions and adjusting energy balance, thereby effectively overcoming the problems of vibration, unstable operation and great reduction of current efficiency of the electrolytic bath after reduction of the voltage of the electrolytic bath, and realizing highly efficient and stable operation of the electrolytic bath under the condition of low energy consumption.

Description

technical field [0001] A control method capable of effectively reducing energy consumption of an aluminum electrolytic cell relates to a cell voltage control operation method in an aluminum electrolysis process. technical background [0002] In recent years, many electrolytic aluminum enterprises are trying to reduce the power consumption of the electrolytic cell by reducing the voltage of the cell. However, after the voltage was lowered, the electrolytic cell fluctuated severely and the red furnace side phenomenon intensified, and some were even forced to raise the cell voltage again because they could not operate. As a result, the life of the electrolyzer is seriously affected. Considering the investment in the whole process, not only does it fail to save energy, but it increases the energy consumption. [0003] Theoretically speaking, the power consumption of an industrial aluminum electrolytic cell is related to the average voltage and current efficiency. Reducing the a...

Claims

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Application Information

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IPC IPC(8): C25C3/20C25C7/06
Inventor 李旺兴赵庆云邱仕麟张延利
Owner GUIZHOU BRANCH CHINA ALUMINUM IND