Online monitoring system for current distribution of aluminum electrolytic tank

Abstract

The invention discloses an online monitoring system for the current distribution of an aluminum electrolytic tank, belonging to the technical field of aluminum electrolysis. The online monitoring system for the current distribution of the aluminum electrolytic tank comprises at least one measuring device comprising an isometric pressure drop measurement fork or a magnetic field detection sensor, the isometric pressure drop measurement fork is used for measuring the isometric pressure drop value of an anode guide rod or a cathode steel bar of the aluminum electrolytic tank to be tested, the magnetic field detection sensor converts the magnetic induction intensity around the anode guide rod or the cathode steel bar into a proportional voltage value according to a Hall principle, and the measuring device is sequentially connected with a data processing device, a wireless network and an upper computer. The invention satisfies the measurement requirements under high-temperature high-dust environment with high magnetic field intensity, has high system flexibility, is favorable to far-distance signal transmission and can simultaneously monitor a plurality of aluminum electrolytic tanks.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to an on-line monitoring system for the current distribution of an aluminum electrolytic cell. Background technique [0002] The current distribution in the aluminum electrolytic cell will change with the electrolysis process, such as changing the anode, changing the shape of the cell, sedimentation at the bottom of the cell, and damage to the cathode. During the roasting process, by monitoring the change of the current distribution, the contact state of the anode can be found and adjusted in time to avoid uneven roasting caused by local overheating; during the normal spot decomposition process, the operating status of the electrolytic cell can be judged by measuring the current distribution. During the firing and start-up process of the aluminum electrolytic cell, whether the current distribution is normal directly affects the firing and start-up cycle and the quality...

AI Technical Summary

Problems solved by technology

[0007] Among the above methods, although the first method can monitor the current distribution in real time, its disadvantage is that it cannot reflect the current distribution of the aluminum electrolytic cell in real time, and the hysteresis effect is relatively large, so it is impossible to monitor the working status of the aluminum electrolytic cell in real time. adjustment; and data entry and data analysis methods are primitive and inefficient

Although the second method can make up for the shortcomings of the first method, because the number of anode guide rods and cathode steel rods in each aluminum electrolytic cell is as many as dozens, the temperature of the electrolytic cell is very high, and the on-site magnetic field interference is very strong, which will cause It brings great difficulties to signal connection, reasonable wiring and later debugging work, so the accuracy of measurement cannot be guaranteed

However, the last method requires special customization of super-large-capacity current transformers and too many measurement points, resulting in too much initial investment and cannot be promoted on site.

[0008] In addition, the first two methods ignore the error caused by the temperature difference of the measurement part on the estimated value of the current distribution, and this factor will have a greater impact on the accuracy of the measurement results

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