【作者】 孙美佳； 李宝宽； 王强； 彭建平；

【Author】 SUN Meijia;LI Baokuan;Wang Qiang;PENG Jianping;Institute of metallurgy,Northeastern university;

【机构】 东北大学冶金学院；

【摘要】 目前铝电解槽技术朝着大型化发展,随着电流密度增大,磁场对铝电解槽的影响越来越强烈,电磁场分布直接影响铝电解槽内磁流体流动的稳定性及电流效率。基于有限体积方法,建立300kA铝电解槽电-磁-流场三维非稳态数学模型,采用磁动力流体模型(MHD))计算电磁场,VOF方法追踪电解质-铝液界面波动情况,离散相模型(DPM)计算铝电解槽内气泡运动情况,分别考察了电磁力与气泡对槽内流场分布的影响。结果表明:在气泡和电磁力共同作用下的电解质-铝液界面波动点的幅度大于电磁力单独作用和气泡单独作用下界面波动点幅度,而电磁力单独作用下界面点波动幅度大于气泡单独作用下的界面点的波动幅度,说明气泡和电磁力均影响磁流体波动界面波动稳定性,且电磁力对磁流体界面的稳定性影响效果更明显。更多还原

【Abstract】 Currently,the aluminum electrolytic cell technology is in the large-scale development,and there are significant influences of magnetic field to flow field as the current density increasing in the aluminum reduction cell,therefore,the electromagnetic field distribution has a large effect on the stability of magnetohydrodynamic(MHD) flow and current efficiency in aluminum electrolytic cell.Based on the finite volume method,a three-dimensional physical and transient mathematical model of 300 kA aluminum electrolytic cell has been developed.Magnetohydrodynamics(MHD) model is used for describing the electromagnetic field.The volume of fluid(VOF) approach is employed to track the bath-metal interface.The discrete particle model(DPM) is employed to study the motion of gas bubbles in the aluminum electrolytic cells.The results indicate that the bath-metal interface point fluctuation which is combined effect of both gas force and electromagnetic force(EMF) is larger than that in the signal effect of gas force and EMF.Moreover,the interface point fluctuation in EMF is larger than that in gas force.The gas force and EMF have effect on stability of interface fluctuation in magnetohydrodynam ic flow,however the EMF have stronger effect on the interface fluctuation.更多还原