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Effect of Local Cathode Current Increasing on Bath-Metal Two-Phase Flow Field in Aluminum Reduction Cells
Wang Fuqiang1; Liu Wei2; Wang Zhaowen1
2020
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:7Pages:1047-1056
AbstractThe stability of the magnetohydrodynamics (MHD) of aluminum reduction cell is determined by the bath-metal two-phase flow field. So, konwing how to optimize the metal flow field and restrain the bath/metal interface deformation is the key to maintain the stable and efficient operation of cell. Many previous works on the bath-metal flow field are based on the static electromagnetic force stirring the melt, however, it should be have some deviation from the actual cell state. A three dimensional bath-metal two-phase quasi-steady flow model (based on transient electromagnetic force) for full 500 kA aluminum reduction cell was built by means of numerical simulation in this work, and validated by metal velocity and bath/metal interface deformation measurement in industrial cells. The effects of 60% increase of local cathode current on melt flow distribution and interface deformation were simulated and evaluated according to abnormal 6 cases in realistic electrolytic process. It was found that the increase of local cathode current has little effects on the general pattern of flow field and interface deformation in cell, but the amplitude of local metal velocity and interface deformation would be changed in certain extent. The increase of local cathode current in A2 similar to A3 could decrease the interface height in middle cell of downstream side (side B), with anode cathode distance (ACD) increasing by 3.0%. But the other 5 cases could deteriorate the low ACD zone further in side B, especially the increase of local cathode current in A10 similar to A11, with average ACD decreasing by 4.6% in B12 similar to B20. The solution is to cut cathode flexes partially in abnormal position to decrease the effect on the bath-metal two-phase flow. According to the evaluation results, it is found that the uneven distribution of cathode current may be helpful to decrease the interface deformation and improve the MHD stability of cell. Based on this finding, the bath-metal two-phase flow field was changed by increasing the proportion of cathode current at the two ends of cell, the middle part of cell and side A and side B respectively, and then was analyzed in this work. The simulation results show that it is beneficial to restrain the interface deformation by increasing the cathode current at both ends of cell properly, and it is also helpful to solve the cooling problem at cell ends. In particular, when the cathode currents at A1 similar to A4 and A21 similar to A24 increase by 28%, the distribution trend of melt flow field remains unchanged basically, and the maximum of metal velocity under A19 similar to A20 increases by 10%, and the maximum of interface height decreases by 2.4 mm, and the average of ACD under B7 similar to B18 increases by 9.5%. It provides a valuable reference for optimizing the busbar design and improving the cell MHD stability.
KeywordNUMERICAL-SIMULATION PAD VELOCITIES INTERFACE aluminum reduction cell two-phase flow field local cathode current increase interface deformation numerical simulation optimization
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China]
CSCD IDCSCD:6753004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/145965
Collection中国科学院金属研究所
Affiliation1.东北大学
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Wang Fuqiang,Liu Wei,Wang Zhaowen. Effect of Local Cathode Current Increasing on Bath-Metal Two-Phase Flow Field in Aluminum Reduction Cells[J]. ACTA METALLURGICA SINICA,2020,56(7):1047-1056.
APA Wang Fuqiang,Liu Wei,&Wang Zhaowen.(2020).Effect of Local Cathode Current Increasing on Bath-Metal Two-Phase Flow Field in Aluminum Reduction Cells.ACTA METALLURGICA SINICA,56(7),1047-1056.
MLA Wang Fuqiang,et al."Effect of Local Cathode Current Increasing on Bath-Metal Two-Phase Flow Field in Aluminum Reduction Cells".ACTA METALLURGICA SINICA 56.7(2020):1047-1056.
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