scholarly journals Impact of Local Cathode Electrical Cut-Off on Bath–Metal Two-Phase Flow in an Aluminum Reduction Cell

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 110 ◽  
Author(s):  
Fuqiang Wang ◽  
Qinsong Zhang ◽  
Wei Liu ◽  
Youjian Yang ◽  
Zhaowen Wang
Keyword(s):  
Flow Field ◽  
Electromagnetic Force ◽  
Aluminum Reduction Cell ◽  
Melt Flow ◽  
Two Phase ◽  
Interface Deformation ◽  
Aluminum Reduction ◽  
Reduction Cell ◽  
Transient Electromagnetic ◽  
Metal Velocity

Many researchers have investigated the impact factors of the bath–metal flow in an aluminum reduction cell using the simulation method. However, only a few have coupled their models with transient electromagnetic force, which makes the model closer to realistic conditions. In this work, coupling with the transient electromagnetic force, a three dimensional bath–metal two-phase quasi-steady flow model for a full 500 kA cell was built, and the model was validated with the metal velocity and the bath–metal interface deformation measurement in industrial cells. The impacts of local cathode electrical cut-off (LCEC) on the melt flow field were simulated according to six industrial cases. We found that the LCEC has little impact on the general pattern of the melt flow field, but the local metal velocity and the interface deformation would be changed to a certain extent. LCEC at positions A2A3 and A10A11 (as introduced in the full text) could suppress the interface hump at the central downstream area of the cell, with the anode cathode distance (ACD) increased by 3% and 7.5%, respectively. LCEC at positions A18A19 and A22A23 would deteriorate the interface hump condition, with the ACD decreased by 4% and 3%, respectively. The solution given in this paper is to cut the cathode flexes partially at abnormal positions to stabilize the melt flow field.

scholarly journals Mathematical Models for the Novel Cathode Convexes in a Reduction Cell

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Z. He ◽  
T. Xia ◽  
W. Xiong ◽  
Q. Shen ◽  
B. Li
Keyword(s):  
Liquid Aluminum ◽  
Phase Interface ◽  
Electric Energy ◽  
The Novel ◽  
Two Phase ◽  
Interface Deformation ◽  
Aluminum Reduction ◽  
Electric Energy Consumption ◽  
Reduction Cell ◽  
Dynamics Method

A less magnitude of liquid aluminum deformation is required to shorten the anode-cathode distance so as to lower the electric energy consumption of the aluminum reduction cell. A mathematical model aimed to describe the electrolyte/aluminum two-phase flow in reduction cells, based on the computational fluid dynamics method, was developed to study the impacts of the cathode convexes on the electrolyte/aluminum interface deformation. The results showed that the magnitude of the two-phase interface deformation was reduced for about 17.2% with the novel cathode convexes; while at the same time, the washout of the melt on the ledge was also enhanced.

The numerical modeling of melt flow and MHD instabilities in an aluminum reduction cell

JOM ◽  
2010 ◽  
Vol 62 (11) ◽  
pp. 26-31 ◽  
Author(s):  
Hongliang Zhang ◽  
Jie Li ◽  
Zhigang Wang ◽  
Yujie Xu ◽  
Yanqing Lai
Keyword(s):  
Numerical Modeling ◽  
Aluminum Reduction Cell ◽  
Melt Flow ◽  
Aluminum Reduction ◽  
Reduction Cell ◽  
Mhd Instabilities

Numerical Simulation of Electrolyte Two-Phase Flow Induced by Anode Bubbles in an Aluminum Reduction Cell

2007 ◽  
Vol 2 (2) ◽  
Author(s):  
Naijun Zhou ◽  
Yuqing Xue ◽  
John J J Chen ◽  
Mark.P. Taylor
Keyword(s):  
Flow Field ◽  
Current Density ◽  
Two Phase Flow ◽  
Simulation Method ◽  
Phase Flow ◽  
Two Phase ◽  
Aluminum Reduction ◽  
Reduction Cell ◽  
Model Combining ◽  
Aluminium Reduction

In the production process of aluminium reduction cells, the anode bubble laden layer has several important influences on the performance of the aluminium reduction cells. Especially for a "drained cathode cell", without the agitating of movement of the melted metal, the bath flow field could be more important. In this paper, the electrolyte two-phase flow fields were studied by using numerically simulation method based on a two-phase turbulence model combining the k - ? model and the Discrete Random Walk model. The results show that: the motion of the bubbles mostly exists within a thin layer under the anode, which results in inducing local electrolyte to flow around the anode in various circulation flows; the flow field in the anode-cathode space can be divided into three regions with different characters; the results also show the Driving action of bubbles is closely related to the current density, inclination of anode and the anode-cathode distance. In general, the increasing in the current density increases the electrolyte velocity and the turbulent kinetic energy. The decrease in ACD significantly enhances the uniformity of the electrolyte flow field in the anode-cathode space. The increase in anode inclination angle increases the velocity of the electrolyte in the anode-cathode space, which would be beneficial to improving the diffusion and dissolution of the alumina and reducing the resistance between the anode and cathode.

Research on the Penetration Depth in Aluminum Reduction Cell with New Type of Anode and Cathode Structures

JOM ◽  
2014 ◽  
Vol 66 (7) ◽  
pp. 1202-1209 ◽  
Author(s):  
Liu Yan ◽  
Li Yudong ◽  
Zhang Ting’an ◽  
Feng Naixiang
Keyword(s):  
Penetration Depth ◽  
Aluminum Reduction Cell ◽  
Aluminum Reduction ◽  
Reduction Cell ◽  
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