铝电解槽电热场计算精度与网格密度的关系  

Relationship between thermal-electrical calculation accuracy of aluminum reduction cells and mesh density

作　　者：崔喜风[1] 张红亮[1] 邹忠[1] 徐宇杰[1] 李劼[1] 张翮辉[1] 赖延清[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第3期574-578,共5页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2009BAE85B03);国家高技术研究发展计划项目(2008AA030504);国家重点基础研究发展计划项目(2005CB623703);国家自然科学基金资助项目(50874120);国家自然科学基金资助项目(60634020)

摘　　要：以某300 kA铝电解槽为实验对象,利用有限元商业软件ANSYS12.0建立其1/4槽电热模型,研究电热场计算精度与网格密度的关系。首先,通过在同一模型但不同网格划分策略下的计算结果和计算时间的实验比较,初步确定整体网格划分方案,再在模型局部区域进行网格疏密的探索研究。研究结果表明:对于铝电解槽电热场仿真精度而言,电流密度越大的区域受网格密度影响越大,应采用较细的网格;而电势梯度和温度梯度并非网格密度的决定性因素;最终确定所用算例模型的网格划分方案为:x和y方向单元尺寸均为30 mm,z方向阳极钢爪与阳极炭块接触部分取40 mm,z方向其余部分取70 mm,此时,计算精度高且计算效率最高。Taking a quarter model of 300 kA aluminum electrolysis cell as experimental subject,the impaction of mesh density on the thermal electrical calculation accuracy was discussed by the commercial software ANSYS12.0.Firstly,through the comparison of a series computing results and computing times of different grid segmenting strategies on the same model,the preliminary overall meshing policy was determined.Then local grid density was explored.The results show that the greater the current density,the more likely the calculation accuracy is influenced by the mesh density.However,the potential gradient as well as temperature gradient is less correlative.The final meshing strategy for the example in article is as follows： 30 mm for overall x and y coordinates element size,40 mm for the coordinate on top layer,and 70 mm for z coordinate of rest parts,achieving high calculation accuracy with low time consumption.

关 键 词：铝电解槽 电热场 网格密度 

分 类 号：TF821[冶金工程—有色金属冶金]