分时供电条件下锌电解过程电解液酸锌比优化控制

Optimal control for acid-zinc ratio of zinc electrolysis process under condition of time-sharing power supply

针对分时供电生产所带来的锌电解过程中酸锌比难以控制问题,研究面向电流切换过程中能耗最小的酸锌比最优控制策略。在分析锌电解过程动态反应机理的基础上,通过优化求解新液流量及酸锌比预调节时间,得到酸锌比最优切换轨迹。针对外界扰动造成实际电解液酸锌比偏离最优轨迹的问题,提出一种酸锌比轨迹偏差预测控制方法。研究结果表明:所提出的控制策略能使电解液实际酸锌比快速、准确地跟踪优化设定值,保证锌电解过程稳定、低耗运行。

To solve the control problem caused by frequent adjustments of acid-zinc ratio under the condition of time sharing power supply, an optimal control strategy was established to reduce the energy consumption during the current switching period. Based on the material balance and electrochemical equations, the optimal trajectory of acid-zinc ratio was determined by calculating the flow rate of leaching solution and pre-regulating time. A deviation predictive control method was proposed to deal with the deviation of actual acid-zinc ratio from the optimal trajectory. The results show that the acid-zinc ratio is stabilized around the target, which ensures the stability of zinc electrolysis process and the low energy consumption.