Molecular ratio-based aluminum electrolysis energy balance adjusting method and system and aluminum electrolytic cell

Abstract

The invention relates to a molecular ratio-based aluminum electrolysis energy balance adjusting method and system and an aluminum electrolytic cell. The method comprises the steps of: (1) presetting standard electrolyte temperature intervals under different molecular ratios, and collecting an electrolyte temperature measurement value and a molecular ratio measurement value; and (2) comparing the electrolyte temperature measurement value with the corresponding standard electrolyte temperature interval, and if the electrolyte temperature measurement value is higher than the upper limit of the interval, increasing the heat exchange amount of the cell wall through control, if the electrolyte temperature measurement value is lower than the lower limit of the interval, reducing the heat exchangeamount of the cell wall through control, and if the electrolyte temperature measurement value is within the interval range, not carrying out adjusting. Heat balance of the electrolytic cell is reversely adjusted from a heat dissipation side of the electrolytic cell and is independent of energy balance and material balance adjusting parameters of an input end, so that decoupling control over the superheat degree (electrolyte temperature) of the electrolytic cell and other technological parameters is achieved, electrolytic aluminum performance optimization and stable operation during energy input fluctuation can be achieved, and a good energy-saving effect is achieved.

Description

technical field [0001] The invention relates to a molecular ratio-based aluminum electrolysis energy balance adjustment method, system and aluminum electrolytic cell, belonging to the technical field of aluminum electrolytic cell energy saving. Background technique [0002] The industrial production of aluminum electrolysis adopts cryolite-alumina molten salt electrolysis method. The so-called cryolite-alumina molten salt is a multiphase electrolyte system composed of cryolite-based fluoride salt as a flux and alumina as a melt. The carbon body is used as the anode, and the aluminum liquid is used as the cathode. After a strong direct current is passed through, the electrochemical reaction is carried out on the two electrodes in the electrolytic cell at 920 ° C to 970 ° C. The chemical reaction is mainly carried out by the following equation: 2Al 2 o 3 +3C=4Al+3CO 2 . The anode products are mainly carbon dioxide and carbon monoxide gas, and the cathode products are alum...

AI Technical Summary

Problems solved by technology

[0009] However, due to the fact that the electrolytic cell can be used to control the system's real-time acquisition data very little, and the energy balance and material balance affect each other, it is difficult to achieve the stability of the electrolytic reaction and improve the current efficiency to achieve the maximum energy saving. The reality is often to ensure the electrochemistry. The basic conditions of the reaction and the safety and stability of the electrolytic cell and the electrolytic reaction, without sacrificing the current efficiency to increase energy consumption

Energy balance, the most basic process condition of the electrolysis process, cannot be adjusted independently in real time, so it is difficult to ensure that the electrolysis process is in an optimized state; it is difficult to achieve the stability of the aluminum electrolysis process and the optimal balance of energy saving.

Images