铝电解槽阴极钠扩散及热应力-钠膨胀耦合的计算

来源期刊:中国有色金属学报2016年第9期

论文作者:王恒 周凯琦 周终强 黄俊

文章页码:2007 - 2015

关键词:铝电解槽;钠扩散;热应力;钠膨胀;有限元

Key words:aluminum reduction cell; sodium diffusion; thermal stress; sodium expansion; finite element method

摘    要:利用ANSYS Workbench仿真平台建立铝电解槽热应力-钠膨胀耦合计算的有限元模型,提出利用非稳态质量扩散和瞬态热传导的相似性模拟钠扩散的方法,得到了钠在阴极炭块中的浓度分布。根据钠浓度的分布将钠膨胀系数转化为热膨胀系数,实现钠膨胀和热膨胀的间接耦合,模型还考虑钢的塑性变形和摩擦接触,计算结果与实际情况吻合较好。

Abstract: The finite element model of the thermal stress and sodium expansion coupling in the aluminum reduction cell was established by using workbench ANSYS simulation platform. The sodium diffusion of the cathode carbon block was obtained by using the similarity between non steady state mass diffusion and the transient heat conduction. The sodium expansion coefficient was converted into the thermal expansion coefficient according to the distribution of sodium concentration, which can realize the indirect coupling between sodium expansion and thermal expansion. The plastic deformation and friction contact of steel were considered, the calculation results agree well with the actual situation.

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