强化电流下500kA铝电解槽工艺探析

Discussion and Analysis on Technical Process of 500 kA Aluminum Cell under Intensified Current

在研究国内电解槽电流强化的空间、电流强化对电解槽热平衡和稳定性的影响的基础上,针对国内某电解铝企业500 kA电解系列进行电流强化实践,探讨了电流强化后应采取的措施。在生产中,通过工艺参数调整,采用"智能打壳+槽控机"双控制系统,优化电压,保持低分子比、高铝液水平、低铝液温度及过热度等措施,500 kA电解槽电流提升至518 kA,电流密度从0.804 A/cm^(2)提高至0.833 A/cm^(2),且获得了良好的热平衡及稳定性,吨铝能耗降低了152 kW·h,从而论证了电解槽强化电流的可行性。

Based on study of the space of intensified current and the effect of current intensification on cell heat balance and stability,the current intensification practiced on the 500 kA electrolytic cell line of an electrolytic aluminum enterprise in China was done,and the necessary measures to be taken after current intensification were discussed.During the production,by adjustment of process parameters,and the measures such as using"intelligent shelling+slot control"double control system,optimizing voltage,keeping low molecular ratio,high liquid aluminum level,low liquid aluminum temperature and superheat,the current of 500 kA cell was increased to 518 kA,and the current density was increased from 0.804 A/cm2 to 0.833 A/cm2,with good heat balance and stability,energy consumption was reduced by 152 kW·h,which demonstrated the feasibility of intensified current applied on the cell.