On-line measurement method of bus current of aluminium electrolysis cell

Abstract

The invention discloses an on-line measurement method of a bus current of an aluminium electrolysis cell. The on-line measurement method comprises the steps of: acquiring voltage signals of multiple buses simultaneously by utilizing a PLC (Programmable Logic Controller) system; measuring current values by virtue of an instrument for measuring the instantaneous currents of the buses according to the invariant resistance of each single bus; calculating resistance values by the ohm law; and then converting each voltage signal to the real-time current value of each bus. The method is applicable to the on-line measurement on the bus current of any cell-type single electrolysis cell. The method can be used for monitoring the current values of input buses and output buses of a cathode pole and an anode pole of one electrolysis cell at the same time point on line, or establishing a database for the current values of the input buses and the output buses of the cathode pole and the anode pole of one electrolysis cell at the same time point of each period, analyzing the running condition and the trend of the electrolysis cell and guiding electrolysis production.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to an on-line measurement method for the bus current of an aluminum electrolytic cell. Background technique [0002] With the continuous deepening of the industrialization process, the safety production situation is becoming more and more severe, and the requirements for production efficiency and continuous production stability are getting higher and higher. The damage of the electrolytic cell in aluminum electrolytic production is the main reason for the occurrence of leakage accidents, and it is also the biggest safety hazard in the production process of electrolytic aluminum. At present, the basis for judging the damage of the electrolytic cell is mainly through the quality of the aluminum liquid, the temperature of the electrolytic cell shell, the square steel head, or artificially using a drill to explore in the electrolytic cell based on experience. These methods...

AI Technical Summary

Problems solved by technology

For example, the 186KA electrolytic cell designed by Guiyang Aluminum and Magnesium Design Institute has been formed since the furnace, and the power outlet on the B side is generally empty, and the cathode current is relatively large. The current passing through each cathode soft belt bus is too large, about 4500-6000 amperes. Due to limited measurement methods and no accurate, continuous, reliable and accurate data to guide production, furnace control can only be carried out by experience and feeling, and the control effect varies from person to person, which is far from ideal

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