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Constant value control method for alumina concentration of aluminum cell

A technology of fixed value control and aluminum electrolytic cell, which is applied in the field of fixed value control of alumina concentration in aluminum electrolytic cell

Inactive Publication Date: 2011-11-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We know that any fluctuation will have an adverse effect on the indicators of electrolytic cell operation and the life of the cell

Method used

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  • Constant value control method for alumina concentration of aluminum cell
  • Constant value control method for alumina concentration of aluminum cell
  • Constant value control method for alumina concentration of aluminum cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1# aluminum electrolytic cell, the series current is 160kA. The alumina blanking cycle is controlled by the tank control system, so that the alumina blanking cycle runs in the normal blanking cycle for more than 70% of the time; see the operation curve figure 1 . During the control process, the electrolyte of the electrolytic cell is sampled and analyzed, and the control effect of the standard deviation of the alumina concentration is shown in figure 2 . Alumina concentration control realizes the feeding mode mainly based on normal feeding, and the standard deviation of alumina concentration is less than 0.3%.

Embodiment 2

[0026] 2# aluminum electrolytic cell, the series current is 160kA. The alumina blanking cycle is controlled by the tank control system, so that the alumina blanking cycle runs in the normal blanking cycle for more than 70% of the time; see the operation curve image 3 . During the control process, the electrolyte of the electrolytic cell is sampled and analyzed, and the control effect of the alumina concentration and standard deviation is shown in Figure 4 . Alumina concentration control realizes the feeding mode mainly based on normal feeding, and the standard deviation of alumina concentration is less than 0.3%.

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Abstract

The invention discloses a control method for the alumina concentration of an aluminum cell and relates to a control method for an aluminum electrolysis process. The method is characterized by comprising the following steps of: measuring the alumina concentration of electrolyte by performing soft measurement by using a cell control system, wherein the alumina concentration is taken as a feedback value for the alumina concentration control of the cell control system; obtaining an alumina concentration target value serving as a switching condition for the normal blanking period of alumina; controlling the alumina blanking period by using the cell control system; running the normal blanking period for a period of time, running an excessive blanking period to suppress the generation of anode effect and perform concentration verification, running an insufficient blanking period, verifying the alumina concentration once again, running the excessive blanking period once again and returning to the normal blanking period; and realizing constant value control over the alumina concentration in a blanking control mode in which the normal blanking period is run mainly. By adopting the method, the alumina concentration of the aluminum cell can be kept in a basically constant range, and efficient and stable running of the aluminum cell is realized.

Description

technical field [0001] The invention discloses a method for controlling the concentration of alumina in an aluminum electrolysis tank, relating to a control method for an aluminum electrolysis process. Background technique [0002] Energy saving and emission reduction is the top priority in various industrial fields in China today. Electrolytic aluminum is a traditional large energy consumer, so energy saving and emission reduction of electrolytic aluminum is very important. The stable operation of the electrolytic cell is the primary prerequisite for energy saving and emission reduction of electrolytic aluminum. [0003] Good material balance and energy balance are the key to the stable operation of the electrolyzer and the guarantee for the electrolyzer to obtain good economic indicators. The control of alumina concentration in the electrolytic cell is the guarantee of material balance and energy balance. The basic mode of alumina concentration control in the current ele...

Claims

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Application Information

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IPC IPC(8): C25C3/20
Inventor 李旺兴赵庆云邱仕麟张保伟唐新平侯光辉
Owner GUIZHOU BRANCH CHINA ALUMINUM IND