电流强化对铝电解槽氧化铝浓度场分布的影响及优化

以某420 kA铝电解槽为研究对象，建立了氧化铝浓度场的瞬态计算模型，结果表明，电流强化增大了氧化铝浓度分布的不均匀性，仅通过同时改变下料频率无法有效改善氧化铝浓度分布的均匀性。针对该问题，提出了电流强化过程中氧化铝下料方式优化策略：分组交替下料和单点频率控制下料，并对电流强化时的下料优化策略进行仿真计算。结果表明：分组交替下料时，氧化铝高浓度区域面积的波动幅度降低，减小了整个电解质中氧化铝浓度的波动；单点频率控制下料时，局部浓度过高的区域大幅度减小，氧化铝浓度分布的均匀性得到有效改善。

Influence and Optimization of Current Enhancement on Distribution of Alumina Concentration Field in Aluminum Reduction Cell

Based on a 420 kA aluminum reduction cell, a transient calculation model of alumina concentration field was established. The results show that current enhancement increases the non-uniformity of alumina concentration distribution, and the uniformity of alumina concentration distribution cannot be effectively improved by changing the feeding frequency at the same time. In order to solve this problem, the optimization strategies of alumina feeding in the process of current enhancement were proposed: alternate feeding in group and separately controlling the feeding-point frequency. The optimal feeding strategies were simulated and analyzed when enhancing the current. The results show that the fluctuation range of the area with high alumina concentration decreases under the condition of alternate feeding in group, thus reducing the fluctuation of alumina concentration in the bath. When the frequency of the feed point is controlled separately, the area where the local concentration is too high is greatly reduced, and the uniformity of the alumina concentration distribution is effectively improved.