铝电解槽改进型钢棒和绝缘挡板对铝液中水平电流的优化

Optimization of horizontal current in metal pad by using advanced collector bars and insulation boards in aluminum reduction cell

为了减小传统铝电解槽内铝液中存在的较大水平电流,进一步提高铝电解槽电流效率,提出一种改进型阴极钢棒和在铝液中增加绝缘挡板的方案。以有限元软件ANSYS为平台,对175kA预焙铝电解槽电场进行模拟分析,在此基础上通过改变阴极钢棒形状和在铝液层中增加绝缘挡板的方式,探讨不同方案对铝液层水平电流的优化作用。研究结果表明:改进型阴极钢棒可使阳极炭块下铝液中y向水平电流密度的最大值和平均值明显减小,绝缘挡板能有效抑制电流向阳极炭块侧部偏移,而通过改进型钢棒和绝缘挡板的结合,不仅能将铝液层电流控制在阳极炭块下,而且水平电流密度的大小和分布也能得到有效的控制,为铝电解实际生产提供理论依据。

Based on the target of reducing the large horizontal current in metal pad of aluminum reduction cells and improving current efficiency of aluminum reduction cells further more, a kind of advanced collector bars and insulation boards was improved. The software ANSYS was used to calculate the current distribution in the 175 kA prebake aluminum reduction cells. The effect of different conditions on current distribution in metal pad of aluminum reduction cells was talked about by changing the shape of collector bars and installing insulation boards in metal pad. The results show that advanced collector bars can significantly reduce the maximum and average values of horizontal current density along y axis in the metal pad under anode carbon block. Insulation boards can effectively restrain the current offset to the side of the anode carbon block. By combining advanced collector bars with insulation boards, it can not only control the current in metal pad under anode carbon block but the value and distribution of horizontal current density can also be controlled effectively. It provides theory basis for the actual production of aluminum reduction.