Method, system, and aluminum electrolytic cell for adjusting energy balance of aluminum electrolysis based on molecular ratio

Abstract

The invention relates to a molecular ratio-based energy balance adjustment method, system and aluminum electrolysis cell for aluminum electrolysis. The method includes: 1) presetting standard electrolyte temperature ranges with different molecular ratios, and collecting electrolyte temperature measurement values ​​and molecular ratio measurement values; 2) Compare the measured value of the electrolyte temperature with the corresponding standard electrolyte temperature range. If the measured value of the electrolyte temperature is higher than the upper limit of the range, the control increases the heat exchange of the tank wall; if the measured value of the electrolyte temperature is lower than the lower limit of the range, the control decreases. The heat exchange of the tank wall; if the measured value of the electrolyte temperature is within the range, no adjustment is made. The invention adjusts the thermal balance of the electrolytic cell in the reverse direction from the heat dissipation side of the electrolytic cell, and is independent of the energy balance and material balance adjustment parameters of the input end, and realizes the "decoupling" control of the superheat degree (electrolyte temperature) of the electrolytic cell and other process parameters. , can realize the performance optimization of electrolytic aluminum and smooth operation when the energy input fluctuates, and achieve better energy saving effect.

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