Numerical Study on the Ringly-Slotted Stub Hole Design for Prebaked Anode

doi:10.12068/j.issn.1005-3026.2020.12.007

Abstract

Abstract: For the industrial anodes in Hall-Héroult cells， electric current can not pass through the stub hole bottom because of the large initial cast iron-to-carbon air gap at the stub hole bottom. A ringly-slotted stub hole design for the anode was proposed to solve this problem. The effects of the proposed design on the anode and the corresponding mechanism were evaluated by numerical simulations. The initial cast iron-to-carbon air gap at the stub hole bottom in the industrial anode under the gravity was 1.2 mm， while that in the proposed design was reduced to 0.2mm. Consequently， the thermal expansion of the cast iron and the stub caused the air gap to close during operation， which resulted in the contact pressure at the bottom of stub hole， increased the electrical contact area and improved the current distribution. The ringly-slotted stub hole leads to an anode voltage reduction of 22 mV， but shows insignificant effect on the temperature distribution of anodes.

Key words: aluminium electrolysis energy conservation, anode structure optimization, anode voltage drop, numerical simulation, Multiphysics coupling

CLC Number:

TF821

LI Tuo-fu， TAO Wen-ju， WANG Zhao-wen， KONG Ling-yu. Numerical Study on the Ringly-Slotted Stub Hole Design for Prebaked Anode[J]. Journal of Northeastern University Natural Science, 2020, 41(12): 1715-1720.

References

[1]邱竹贤.预焙槽炼铝［M］.3版.北京:冶金工业出版社2005:28-37.(Qiu Zhu-xian.Aluminium metallurgy in prebaked anode reduction cells［M］.3rd ed.Beijing:Metallurgical Industry Press，2005:28-37)
[2]Fortin H，Kandev N，Fafard M.FEM analysis of voltage drop in the anode connector induced by steel stub diameter reduction［J］.Finite Elements in Analysis and Design，2012，52:71-82.
[3]Gunasegaram D R，Molenaar D.Towards improved energy efficiency in the electrical connections of Hall-Héroult cells through finite element analysis (FEA) modeling［J］.Journal of Cleaner Production，2015，93:174-192.
[4]Tremblay S O，Marceau D，Kocaefe D，et al.Development of a new approach to increase the electrical performance of anodic assemblies［C］//Light Metals 2015.Warrendale，PA:TMS，2015:1175-1180.
[5]Dagoberto S S，Vanderlei G.Design options to reduce energy consumption in aluminium electrolysis cells［C］//34th International ICSOBA Conference.Quebec，2016:505-517.
[6]Berends W，Haley S，Gagnon M.Low resistance anode assembly using steel stubhole conductors across the cast iron to carbon interface［C］//Light Metals 2016.Warrendale，PA:TMS，2016:965-969.
[7]Richard D，Goulet P，Trempe O，et al.Challenges in stub hole optimisation of cast iron rodded anodes［C］//Light Metals 2009.Warrendale，PA:TMS，2009:543-548.
[8]Richard D，Fafard M，Lacroix R，et al.Aluminum reduction cell anode stub hole design using weakly coupled thermo-electro-mechanical finite element models［J］.Finite Elements in Analysis and Design，2001，37(4):287-304.
[9]Molenaar D，Kilpatrick T，Montalto A.Experimental investigation of factors affecting the electrical performance of the stub to carbon connection［C］//Light Metals 2013.Warrendale，PA:TMS，2013:1359-1364.
[10]Chaouki H，Baiteche M，Jacques A，et al.Finite element analysis of slot size effect on the thermal-electrical behaviour of the anode［C］//Light Metals 2017.Warrendale，PA:TMS，2017:1315-1323.
[11]Li T F，Tao W J，Wang Z W，et al.Numerical simulation on the transient temperature field of anode rodding in aluminium reduction cells［J］.Metals，2018，8(12):1026-1048.
[12]Li H S，Cao X，Tian Y F.Optimization of anode structure in aluminum reduction cells under low power consumption［J］.The Chinese Journal of Nonferrous Metals，2012，22(10):2960-2969.
[13]Wilkening S，Cote J.Problems of the stub-anode connection［C］//Light Metals 2007.Warrendale，PA:TMS，2007:865-873.
[14]Wang Q，Li B K，Fafard M.Effect of anode change on heat transfer and magneto-hydrodynamic flow in aluminum reduction cell［J］.JOM，2016，68(2):610-622.
[15]李拓夫，陶文举，王兆文，等.磷生铁和钢爪尺寸对铝电解槽阳极物理场的影响［J］.东北大学学报(自然科学版)，2020，41(6):828-834.(Li Tuo-fu，Tao Wen-ju，Wang Zhao-wen，et al.Effects of the size of cast iron and stub on the physical field of anode in aluminium reduction cell［J］.Journal of Northeastern University(Natural Science)，2020，41(6):828-834.)(上接第1679页)
[7]Wojke N，Bewley A，Paulus D.Simple online and real time tracking with a deep association metric［C］//IEEE International Conference on Image Processing.Beijing，2017:3645-3649.
[8]Sadeghian A，Alahi A，Savarese S.Tracking the untrackable:learning to track multiple cues with long-term dependencies［C］//IEEE International Conference on Computer Vision.Venice，2017:300-311.
[9]Goodfellow I，Pouget-Abadie J，Mirza M，et al.Generative adversarial nets［C］//Advances in Neural Information Processing Systems.Montreal，2014:2672-2680.
[10]Zheng Z，Zheng L，Yang Y.Unlabeled samples generated by GAN improve the person re-identification baseline in vitro［C］//IEEE International Conference on Computer Vision.Venice，2017:3754-3762.
[11]孙亚圣，姜奇，胡洁，等.基于注意力机制的行人轨迹预测生成模型［J］.计算机应用，2019，39(3):668-674.(Sun Ya-sheng，Jiang Qi，Hu Jie，et al.Attention mechanism based pedestrian trajectory prediction generation model［J］.Journal of Computer Applications，2019，39(3):668-674.)
[12]Gupta A，Johnson J，Li F F，et al.Social GAN:socially acceptable trajectories with generative adversarial networks［C］//IEEE Conference on Computer Vision and Pattern Recognition.Salt Lake City，2018:2255-2264.
[13]Milan A，Leal-Taixe L，Reid I，et al.MOT16:a benchmark for multi-object tracking［J/OL］.arXiv preprint arXiv:1603.00831，2016:1-12.
[14]Bewley A，Ge Z Y，Ott L，et al.Simple online and real time tracking［C］//IEEE International Conference on Image Processing.Phoenix，2016:3464-3468.