摘要
换极是现代铝电解工业的必要操作之一,新换冷极对电解槽的热场、电场和稳定性造成巨大冲击。本文开发了换极过程中的热-电-流仿真模型,对不同区域(如角部极、中间极)、不同工艺(换热极)的换极进行了模拟分析。研究发现换角部极对槽温度的影响大于中间极,可为角部极提供较大的附加电压值或较长的附加电压时间来增加换角极的热收入,提高温度恢复速度,而换热极工艺则可大大加快新极的温度恢复速度。通过本模型的研究可为换极过程优化提供模型和手段,以达到减小换极影响、提高电流效率的目的。
Anode changing is one of necessary operations in modern aluminum industry,and the new cold anodes could exert huge impact on thermal field,electric field and cell stability.In this paper,a simulation model was developed to investigate the thermo-electric-flow behavior after anode change in different locations(corner anodes or internal anodes)and with different anode changing strategies(cold or hot anodes).It was found that the effect of corner anode changing on cell temperature was greater than that of internal anodes.It was possible to provide the corner anode with a larger additional voltage magnitude or a longer additional voltage time to increase cell heat input for the corner anode changing and speed up the recovery rate of temperature.It was also found that the recovery rate of new anode temperature after hot anode changing was much faster.The model study can provide a model or methods to optimize the anode changing process,so as to reduce the influence of anode change and ultimately improve the current efficiency.
作者
赵志彬
刘伟
杨晓东
Zhao Zhibin;Liu Wei;Yang Xiaodong(Shenyang Aluminium&Magnesium Engineering&Research Institute Co.,Ltd.,Shenyang 110001,China)
出处
《轻金属》
北大核心
2020年第5期26-30,共5页
Light Metals
基金
中铝青年科技人才启明星计划项目2018MXJH13
国家自然科学基金重点项目No.51434005。
关键词
铝电解槽
换极
热-电-流多物理场
aluminum reduction cell
anode change
thermo-electric-flow multi-field
