Superheat degree-based aluminum electrolysis energy balance adjusting method and system and aluminum electrolytic cell

Abstract

The invention relates to a superheat degree-based aluminum electrolysis energy balance adjusting method and system and an aluminum electrolytic cell. The method comprises the steps of: (1) presettinga standard superheat degree interval, and collecting a superheat degree measurement value of an electrolyte; and (2) comparing the superheat degree measurement value with a standard superheat degree interval, and if the superheat degree measurement value is higher than the upper limit of the standard superheat degree interval, increasing the heat exchange amount of the cell wall, if the superheatdegree measurement value is lower than the lower limit of the standard superheat degree interval, reducing the heat exchange amount of the cell wall, and if the superheat degree measurement value is within the standard superheat degree interval range, not carrying out adjusting. Heat balance of the electrolytic cell is reversely adjusted from a heat dissipation side (namely a heat output end) 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 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 an aluminum electrolysis energy balance adjustment method, system and aluminum electrolytic cell based on superheat, and belongs 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...

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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.

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