基于统计过程控制方法的铝电解生产工艺优化

Optimization of Aluminum Electrolysis Production Process and Energy Efficiency by Statistical Process Control Method

高铝水平操作工艺尽管一定程度上降低了漏槽风险,却存在电解槽沉淀增多、炉底压降升高、侧部散热增加和能耗增加等问题。利用统计过程控制方法设计的氟化铝添加策略和调控电解槽热平衡方式,能够保障在降低铝水平、降低槽电压的同时保持电解生产稳定运行。研究结果表明,具有破损趋势的铝电解槽生产工艺经过优化后,槽温、分子比、氟化铝下料量、热波动幅度显著降低,电解槽更加稳定。4台试验槽与对比槽相比,电流效率提高1.29%,铝直流电耗减少93 k Wh/t。

In this paper, In order to obtain a stable cell condition, to extend the life of the aluminum electrolytic cell, Electrolytic aluminium entarprises tends to use a high rnetal level operation. Although this process can reduces the leakage risk, there are some problems, such as the higher sludge formation, increase in CVD, and high dissipation from the sidewall requiring higher voltage to maintain heat balance.The addition strategy of aluminum fluoride and the method of controlling the heat balance of the cell designed by the statistical process control method.which can keep heat balance when the metal level is lowered and the voltage is lowered.The result shows that the optimization of the production process of aluminum reduction cell with breakage trend, the bath temperature,cryolite ratio, the amount of aluminum fluoride and thermal wave amplitude decreased significantly, and the cell was more stable.Compared with reference cell, the current efficiency of the test cell is increased by 1.29%, and the DC power consumption is reduced by 93 k Wh/t-Al.