大型预焙铝电解槽异常槽况下的电场特性研究

Study on Characteristic of Electric Field of Modern Large-scale Prebaked Aluminum Cell under Abnormal Condition

以某420kA大型预焙铝电解槽为对象,利用ANSYS平台建立铝电解槽在异常槽况下的电场有限元模型,计算并分析了生产过程中氧化铝沉淀和阳极更换过程对电场的影响。结果表明,大面积沉淀的产生会明显改变原有的钢棒电流的分布特性,而区域分散沉淀和小面积沉淀对钢棒电流分布影响较小;随着换极位置的改变,电解质层电场、铝液水平电流密度及钢棒电流均呈现大幅变化。本研究可为沉淀诊断分析及阳极更换制度的优化提供支撑。

FEM of aluminum electrolytic cell electric field under abnormal condition was built based on ANSYS commercial software platform applying 420 kA large-scale prebaked anode aluminum reduction cell as object.The effects of sludge and anode exchange on electric field in running process were calculated and analyzed.The results show that large-area sludge formation changes the original steel bar current distribution characteristics obviously,but dispersive and small precipitation has little influence on current distribution of steel bar.Electric field of electrolyte layer,average current density of liquid aluminum layer,and steel bar current change sharply with change of anode change positions.This research can be fundamental for precipitation diagnostic analysis and anode exchange system optimization.