Aluminum electrolysis cell region control system and method

Abstract

The invention discloses a control system for an electrolysis cell, and particularly relates to an aluminum electrolysis cell region control system for regionally controlling material balance, anode current distribution and aluminum electrolyte interface stability of a pre-baked anode aluminum electrolysis cell by using a region control method and an aluminum electrolysis cell region control method. The system comprises the electrolysis cell and a cell control machine; the electrolysis cell is divided into two or more control regions; and a signal acquisition and processing subsystem, a cell condition diagnosis subsystem, a regional alumina feeding subsystem and a regional polar distance control subsystem are arranged in each control region. The system and the method have the advantages of controlling each control region of the electrolysis cell with pertinence, improving the control precision, performing effective monitoring and separate region control on the abnormal regions, preventing the integral operation from destroying the state of the electrolysis cell, particularly heat balance, facilitating stable electrolysis cell operation, and achieving the effects of saving energy, reducing consumption and improving current efficiency.

Description

technical field [0001] The invention relates to a control system of an electrolytic cell, in particular to an aluminum electrolytic cell regional control system for controlling the material balance, anode current distribution, and electrolyte aluminum liquid interface stability of a prebaked anode aluminum electrolytic cell by using a regional control method. method. Background technique [0002] There are complex material balance and physical field distribution in the aluminum electrolytic cell. Only by reasonably controlling as many parameters of the electrolytic cell as possible can the electrolytic cell achieve better material balance and heat balance, and obtain better technical and economic indicators. [0003] The traditional control method is to analyze and process the overall voltage signal of the electrolyzer, and use various control strategies to control the electrolyzer as a whole. As the size continues to increase, there are serious spatial imbalances in the p...

AI Technical Summary

Problems solved by technology

As the size continues to increase, there are serious spatial imbalances in the pole distance, melt flow rate and interface fluctuations.

The shortcomings of traditional control methods continue to be exposed

The concentration of alumina in the electrolyte is not uniform in space, and the traditional control method lacks targeted control, which easily induces the anode effect; the traditional control method is difficult to monitor and adjust the current distribution of the anode in real time, and it is easy to Severe anode current bias occurs, resulting in energy waste; when the local interface of the electrolytic cell fluctuates violently, the traditional control method can only control the overall pole distance, and the thermal balance of the electrolyzer is often destroyed with the adjustment of the overall pole distance

[0004] This traditional control method that does not consider the regional differences of the electrolytic cell can no longer adapt to the current society's desire to reduce the energy consumption of the aluminum electrolysis process, reduce the emission of harmful gases generated in the anode effect, and the aluminum plant's desire to further improve the current efficiency and cell life. requirements

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