Aluminium electrolytic bath cathode current online adjustment method and device thereof

Abstract

The invention discloses an aluminium electrolytic bath cathode current online adjustment method, comprising the following steps: (1) anode current signal and cathode current signal are respectively collected in an aluminium electrolytic bath, and the collected two signals are input into a cathode current online adjustment controller; (2) in the cathode current online adjustment controller, the two signals are subjected to logical analysis and calculation to obtain the deviation between the anode current and the cathode current, find out the position needing adjusting and adjust the magnitude of volume, and a control command is output; (3) after a cathode current receiver located on the aluminium electrolytic bath receives the control command, the cathode current path is adjusted so as to change the magnitude of the cathode current. The invention has the following beneficial effects: the cathode current distribution is adjusted in time according to the requirement of the electrolytic bath operation, thus causing the horizontal current of the electrolytic bath to be the least, overcoming the problem of balancing voltage fluctuation by boosting voltage formerly, greatly saving electricity and avoiding great drain on manpower and material resources caused by adjusting with other methods formerly.

Description

technical field [0001] The invention relates to a method for online current adjustment, in particular to a method for adjusting the cathode current of an aluminum electrolytic cell, and to a device used for implementing the method. Background technique [0002] Such as figure 1 , figure 2 As shown, the current path of the electrolytic cell used in the production of electrolytic aluminum industry is to enter from the anode, first lead into the electrolyte layer from the bottom of the anode, then lead into the aluminum liquid layer from the electrolyte layer, and finally lead out from the cathode, and the cathode is installed on the cathode carbon block. The conductive rod in the carbon block, the cathode current deriving busbar and the soft busbar connecting the cathode conducting rod and the cathode current deriving busbar. [0003] Because the aluminum electrolytic cell works under the condition of strong direct current, there are dozens of groups of cathodes and anodes,...

AI Technical Summary

Problems solved by technology

Cathode current distribution is achieved by increasing or reducing the cross-section of the soft bus bar connecting the cathode conductive rod and the cathode current lead-out bus bar, that is, the size of its resistance value. The position of the busbar is different, and its current adjustment is also different, but these are all fixed in the design and construction under specific parameters, and cannot be adjusted again according to the actual situation in the production process

For example, when replacing a certain group of anodes, due to the hysteresis of anode conductivity, the lag time is generally about 24 hours. During this period, the current derived from the corresponding cathode should be correspondingly reduced. The horizontal current in the area increases, resulting in a decrease in electrolytic production efficiency and voltage fluctuations. In order to avoid voltage fluctuations, the production voltage is raised by about 0.2V and kept for about 2 hours. For a medium-sized electrolytic aluminum plant, The wasted electric energy is as high as nearly 40,000 kilowatt-hours a day.

In addition, when there is an abnormality at the bottom of the electrolytic cell or an abnormality in individual anodes, it is necessary to adjust the corresponding cathode current in time to ensure efficient operation of production, which cannot be achieved by current technologies

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