Formulating the control problem. The flowsheet used for the industrial production of aluminum by the electrolysis of cryolite-alumina melts is characterized by the melt temperature, its composition (primarily the concentration of dissolved alumina), the distance between the anodic and cathodic metal (the interpolar distance), the shape of the combustion space, the melt and electrolyzer levels, as well as electrical parameters - the pressure drop on the electrolyzer and the current strength. All these indices will, to some degree, affect the efficiency of the electrolysis process, and will be evaluated from the specific consumption of electricity, the electrolyzer productivity, the quality of the metal produced, and the period between repairs. Along with the long list of technological and technico-economic indices related to the control processes of an electrolyzer, which can operationally change these indices, there are two which merit attention: a change in the interpolar distance with anode transposition and change in the amount of alumina charged into a bath.
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