METHOD CONTROLLING TECHNOLOGICAL PROCESS IN ALUMINUM ELECTROLYZER

摘要

FIELD: nonferrous metallurgy, updating of control system of aluminum electrolyzer. SUBSTANCE: excessive feed of alumina into electrolyte is carried out at values of rate of change of reduced voltage &Dgr;И 0 0 and its absolute value above preset limit to obtain values of change of reduced voltage &Dgr;И ≤ 0,, absolute value of reduced voltage is evaluated, it is compared with preset one and mismatch is corrected. In this case system is transferred to nominal ( calculated mode of feed of alumina into electrolyte. With values of rate of change of reduced voltage &Dgr;И 0 and its absolute value below preset one inadequate ( from nominal ) feed of alumina into electrolyte is carried out till values of rate of change of reduced voltage &Dgr;И ≥ 0 are achieved, its absolute value is evaluated, compared with preset one and mismatch is corrected. In this case feed of alumina into electrolyte is transferred to nominal ( calculated ) mode. If "АЭ" prediction is available excessive feed of alumina into electrolyte is carried out till this prediction disappears or to appearance of "АЭ" and interpole gap is not corrected. In presence of MHD instability inadequate feed of alumina is conducted and interpole gap is enlarged till MHD instability is corrected. After correction of "АЭ" excessive feed of alumina into electrolyte is carried out in the course of time proportional to voltage. EFFECT: maintaining of concentration of aluminum oxide in electrolyte. 2 cl, 2 dwg , 3 tbl