J. Li
,
W. Liu
,
Y.Q. Lai
,
null
,
null
金属学报(英文版)
Two full 3D steady mathematical models are developed by finite element method (FEM) to calculate coupled physics fields: the electro-magnetic model is built and solved first and so is the fluid motion model with the acquired electromagnetic force as source body forces in Navier-Stokes equations. Effects caused by the ferromagnetic shell, busbar system around, and open boundary problem as well as inside induced current were considered in terms of the magnetic field. Furthermore, a new modeling method is found to set up solid models and then mesh them entirely with so-called structuralized grids, namely hex-mesh. Examples of 75kA prebaked cell with two kinds of busbar arrangements are presented. Results agree with those disclosed in the literature and confirm that the coupled simulation is valid. It is also concluded that the usage of these models facilitates the consistent analysis of the electric field to magnetic field and then flow motion to the greater extent, local distributions of current density and magnetic flux density are very much dependent on the cell structure, the steel shell is a shield to reduce the magnetic field and flow pattern is two dimensional in the main body of the metal pad.
关键词:
coupled simulation
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null
,
null
,
null
,
null
尹诚刚
,
李劼
,
徐宇杰
,
杨帅
,
赖延清
,
江南
,
张红亮
中国有色金属学报
采用数值仿真的方法对应用一种可减小铝液中水平电流的新型阴极钢棒的420 kA级铝电解槽进行三维计算，分析这种新型阴极钢棒对铝液中水平电流、槽电压以及电解槽温度分布的影响。结果表明：新型阴极钢棒可有效地减小铝液中X方向的水平电流；新型阴极钢棒中绝缘材料的加入在一定程度上增大了槽电压；当钢棒和钢棒糊接触不是很好时，新型阴极钢棒电解槽比传统阴极钢棒电解槽更容易出现阴极炭块和钢棒连接区域温度过高的情况。该计算结果可为铝电解槽在应用此种新型阴极钢棒后所获得的节能效果以及个别槽在运行过程中出现的问题提供理论依据。
关键词:
铝电解槽
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新型钢棒
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水平电流
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电热场
,
数值模拟
,
电接触
丁培林
,
王恒
,
黄俊
,
王紫千
,
曹斌
中国有色金属学报
铝电解槽内保持良好的热平衡可以减少铝电解过程中的能耗,而氧化铝周期性的下料会破坏电解槽热平衡.建立铝电解槽电解质浓度-热场瞬态模型,在精确模拟氧化铝浓度分布的基础上,研究下料期间电解质温度及热平衡的变化趋势.结果表明:氧化铝下料时,电解质极距层局部温度降低5℃左右,上表面附近区域最多降低十几度;下料结束20 s内,逐渐恢复到正常温度;氧化铝下料会打破电解质内的热平衡,其中部分热量(最高达300 kW)用来加热氧化铝颗粒;20s后,电解质会达到新的热平衡状态.
关键词:
铝电解槽
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氧化铝浓度分布
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浓度
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热场
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热平衡
王恒
,
周凯琦
,
周终强
,
黄俊
中国有色金属学报
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.
关键词:
铝电解槽
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钠扩散
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热应力
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钠膨胀
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有限元
