Method for controlling electrolytic cell under low-voltage production

Abstract

The invention discloses a method for controlling an electrolytic cell under low-voltage production. The method comprises the following logical steps of: 1, after a cell control machine checks an anode replacement command, automatically lifting an anode for 1.5 seconds, complementing energy in advance, and checking whether the anode is replaced completely by voltage change, and after the replacement of the anode is finished, performing anode-replacement-post additional control to ensure that the concentration of alumina is 1.5 to 2.5 percent; 2, in a process of controlling the concentration of alumina, when the cell control machine detects that voltage is increased during over-processing, and the voltage is reduced during under-processing, timely correcting to ensure that the concentration of alumina is recovered to be in a normal control area, namely the concentration of alumina is 1.5 to 2.5 percent; and after the concentration of alumina is recovered to be in the normal control area, adjusting target voltage to target voltage required when the concentration is abnormal, and performing normal control. The concentration of alumina is controlled in a whole process, so the energy compensation of the electrolytic cell, and the normal concentration of alumina are guaranteed.

Description

technical field [0001] The invention relates to aluminum electrolysis energy compensation and blanking control technology, and belongs to the technical field of aluminum electrolysis control. Background technique [0002] In the low-voltage production mode, the sensitivity of the electrolytic cell increases significantly, and the anti-interference ability decreases. Replacement of anodes, abnormal alumina concentration and frequent anode actions have a greater impact on the electrolytic cell condition. (1) Replace the anode. The existing control logic after replacing the anode is to increase the target voltage by 70MV and keep it for about 1 hour. The purpose is to compensate the energy taken away by the replacement of the anode. During this process, the underprocessing method has been used , because part of the alumina falls into the electrolyte during the process of replacing the anode, however, one hour of additional voltage during low-voltage production is not enough at ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a control method for an electrolytic cell under low-voltage production, so as to overcome the deficiencies in the prior art such as frequent voltage swings, uncontrolled concentration, and high noise during low-voltage production.