On the AlF3 and temperature control of an aluminum electrolysis cell
On the AlF3 and temperature control of an aluminum electrolysis cell
复制标题
DOI：
10.1109/87.664183
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
T. Drengstig;D. Ljungquist;B. Foss
中科院分区：
文献类型：
--
作者：
T. Drengstig;D. Ljungquist;B. Foss
基于实测数据的分析和简单动态模型的研究，提出了一种控制预焙铝电解槽多余AlF/ sub3 /和槽内温度的控制策略。模型验证表明存在模型未捕获的动态，因此，我们使用过量AlF/sub - 3/和浴池温度的实际数据分别估计AlF/sub - 3/和能量扰动。估计结果表明，能量扰动是主要扰动。因此，所提出的控制策略是基于接近平均消耗的几乎恒定的AlF/sub 3/输入和能量操作来补偿干扰。这就要求在不降低电流效率的情况下降低电阻参考值的可能性。与目前的控制策略相比，这在控制器中引入了额外的自由度。通过提高和稳定电流效率、降低和稳定能量消耗、减少昂贵添加剂的消耗以及延长电池寿命，所提出的控制策略可能意味着显著的经济潜力。
We propose a control strategy for excess AlF/sub 3/ and bath temperature of a prebake aluminum electrolysis cell based on analyses of measured data and studies of a simple dynamic model. Model validation indicates that there are dynamics that the model does not capture, and hence, we use real data of excess AlF/sub 3/ and bath temperature to estimate AlF/sub 3/ and energy disturbances, respectively. The estimation results show that the energy disturbance is the dominating disturbance. Hence, the proposed control strategy is based on an almost constant AlF/sub 3/ input close to average consumption and energy manipulations to compensate for the disturbances. This requires the possibility for the resistance reference to be reduced without decreasing the current efficiency. Compared to present control strategies, this introduces an additional degree of freedom in the controller. The proposed control strategy may imply a significant economic potential through increased and stabilized current efficiency, reduced and stabilized energy consumption, reduced consumption of expensive additives, and prolongation of cell life.