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A Smart Individual Anode Current Measurement System and Its Applications

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Light Metals 2023 (TMS 2023)

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Abstract

This paper discusses a new individual anode current measurement scheme and its applications in real-time monitoring and control of the Hall-Héroult process. While anode current can be directly measured from the anode rod, this approach takes measurements from the anode beam allowing the sensors to remain intact through various cell operations, including anode change. This instrumentation scheme employs smart sensors that are daisy-chained on a common bus for digital data transfer. This approach limits electromagnetic interferences and offers system self-configuration and self-diagnosis, thus allowing for easy maintenance. The system can be configured to work across a broad range of cell technologies. Monitoring anode current distributions helps improve process operation and allows early detection of process faults such as perfluorocarbon co-evolution and blocked feeders. This also offers the ability to monitor process states such as local alumina concentration and bath temperature, along with potential improvements to cell operation and current efficiency.

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References

  1. Homsi P, Peyneau J-M, Reverdy M (2000) Overview of Process Control in Reduction Cells and Potlines. Paper presented at the Proceedings of the TMS Light Metals, Nashville, Tennessee, USA.

    Google Scholar 

  2. Gao YS, Taylor MP, Chen JJJ, Hautus MJ (2011) Operational and control decision making in aluminium smelters. Advanced Materials Research. 201–203(2011):1632–1641.

    Article  Google Scholar 

  3. Holmes GT, Fisher DC, Clark JF, Ludwig WD (1980) Development of Large Prebaked Anode Cells by Alcoa. Paper presented at the Proceedings of the TMS Light Metals, Las Vegas, Nevada, USA.

    Google Scholar 

  4. Keniry J, Shaidulin E (2008) Anode signal analysis—the next generation in reduction cell control. Paper presented at the Proceedings of the TMS Light Metals, New Orleans, Louisiana, USA.

    Google Scholar 

  5. Potocnik V, Reverdy M (2021) History of Computer Control of Aluminum Reduction Cells. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  6. Langon B, Varin P (1986) Aluminium Pechiney 280 kA Pots. Paper presented at the Proceedings of the TMS Light Metals, New Orleans, Louisiana, USA.

    Google Scholar 

  7. Huni JPR (1987) A-275—Individual anode control. Paper presented at the Proceedings of the TMS Light Metals, Denver, Colorado, USA.

    Google Scholar 

  8. Barnett WM (1988) Measuring Current Distribution in an Alumina Reduction Cell. Patent number 4786379.

    Google Scholar 

  9. Keniry JT, Barber GC, Taylor MP, Welch BJ (2001) Digital processing of anode current signals: an opportunity for improved cell diagnosis and control. Paper presented at the Proceedings of the TMS Light Metals, New Orleans, Louisiana, USA.

    Google Scholar 

  10. Rye KA, Königsson M, Solberg I (1998) Current Redistribution Among Individual Anode Carbons in A Hall-Heroult Prebake Cell at Low Alumina Concentrations. Paper presented at the Proceedings of the TMS Light Metals, San Antonio, Texas, USA.

    Google Scholar 

  11. Panaitescu A, Moraru A, Panaitescu I (2000) Visualisation of the Metal Pad Waves in the Aluminum Reduction Cell with Pre-baked Anodes. Paper presented at the Proceedings of the TMS Light Metals, Nashville, Tennessee, USA.

    Google Scholar 

  12. Panaitescu A, Moraru A, Panait N, Dobra G, Munteanu N, Cilianu M (2001) Experimental Studies on Anode Effects by the Visualisation of the Molten Aluminium Surface Oscillations. Paper presented at the Proceedings of the TMS Light Metals, New Orleans, Louisiana, USA.

    Google Scholar 

  13. Shaidulin E, Gusev A, Vabischevich P (2005) Method of controlling aluminum reduction cell with roasted anodes. Patent number 2303658C1.

    Google Scholar 

  14. Shaidulin E, Gusev A, Vabischevich P (2007) Method of controlling aluminum reduction cell with prebaked anodes. Patent number 11/592557.

    Google Scholar 

  15. Yao Y (2017), Process Monitoring, Modelling and Fault Diagnosis in Aluminium Reduction Cells. Ph.D. thesis, School of Chemical Engineering, Faculty of Engineering, the University of New South Wales, Australia.

    Google Scholar 

  16. Cheung CY, Menictas C, Bao J, Skyllas-Kazacos M, Welch BJ (2013) Frequency response analysis of anode current signals as a diagnostic aid for detecting approaching anode effects in aluminum smelting cells. Paper presented at the Proceedings of the TMS Light Metals, San Antonio, Texas, USA.

    Google Scholar 

  17. Cheung C-Y (2013), Anode Current Signals Analysis, Characterization and Modeling of Aluminum Reduction Cells. Ph.D. thesis, School of Chemical Engineering, Faculty of Engineering, the University of New South Wales, Australia.

    Google Scholar 

  18. Qiu Z, Ji F, Li Y, Yu Q, Li L, Li C (2013) Online measurement and data analysis device for anode current distribution of aluminum electrolysis cell. Patent number CN203080085U.

    Google Scholar 

  19. Li J, Yang S, Zou Z, Zhang H (2015) Experiments on Measurement of Online Anode Currents at Anode Beam in Aluminum Reduction Cells. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  20. Yang S, Zou Z, Li J, Zhang H (2016) Online anode current signal in aluminum reduction cells: measurements and prospects. JOM. 68(2):623–634.

    Article  CAS  Google Scholar 

  21. Bao J, Welch BJ, Akhmetov S, Yao Y, Cheung C-Y, Jassim A, Skyllas-Kazacos M (2017) Method of monitoring individual anode currents in an electrolytic cell suitable for the Hall-Heroult electrolysis process. Patent number WO 2017/141135 A1.

    Google Scholar 

  22. Huang R, Li Z, Cao B (2021) Design and Implementation of Online Detection System for Anode Current Distribution in Aluminum Reduction Cell. Paper presented at the China Automation Congress (CAC).

    Google Scholar 

  23. Yin Y, Wang J, Cui J, Xiao G, Xu Z, Zhang S, Wang F (2016) Aluminium cell positive pole distribution electric current precision measurement appearance with self calibration function. Patent number CN205501431U.

    Google Scholar 

  24. Wieser C, Helmbold A, Glzow E (2000) A new technique for two-dimensional current distribution measurements in electrochemical cells. Journal of Applied Electrochemistry. 30(7):803–807.

    Article  CAS  Google Scholar 

  25. Urata N, Evans J (2010) The determination of pot current distribution by measuring magnetic fields. Paper presented at the Proceedings of the TMS Light Metals, Seattle, Washington, USA.

    Google Scholar 

  26. Hung OK (2000) Anode and Cathode Current Monitoring. Patent number 6136177.

    Google Scholar 

  27. Evans JW, Urata N (2011) Technical and operational benefits of individual anode current monitor. Paper presented at the Proceedings of 10th Australasian Aluminium Smelting Technology Conference, Launceston, Tasmania, Australia.

    Google Scholar 

  28. Evans JW, Urata N (2012) Wireless and non-contacting measurement of individual anode currents in Hall-Heroult pots; experience and benefits. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  29. Lützerath A, Evans JW, Victor R (2014) On-line monitoring of anode currents: Experience at TRIMET. Paper presented at the Proceedings of the TMS Light Metals, San Diego, California, USA.

    Google Scholar 

  30. Dion L, Lagac C-L, Evans JW, Victor R, Kiss LI (2015) On-line monitoring of individual anode currents to understand and improve the process control at Alouette. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  31. Baker B (2011) How delta-sigma ADCs work, Part 1, in Data Acquisition, Texas Instruments Incorporated. https://www.ti.com/lit/an/slyt423a/slyt423a.pdf?ts=1660200202417. Accessed 11 August 2022.

  32. Microchip Technology (2019) SAM D/L/C—Oversampling and decimation feature. https://microchipsupport.force.com/s/article/SAM-D-L-C---Oversampling-and-decimation-feature. Accessed 11 August 2022.

  33. Gee R (2020) CAN vs. RS-485: Why CAN is on the move, in Delivering Robust Communications, Maxim Integrated, Editor. https://www.maximintegrated.com/content/dam/files/design/technical-documents/white-papers/can-wp.pdf. Accessed 11 August 2022.

  34. Total Phase (2019) What is CAN Bus Protocol? https://www.totalphase.com/blog/2019/08/5-advantages-of-can-bus-protocol/. Accessed 11 August 2022.

  35. ABLIC (2020) What is a watchdog timer (WDT)? https://www.ablic.com/en/semicon/products/automotive/automotive-watchdog-timer/intro/. Accessed 11 August 2022.

  36. Peterson RW (1976) Temperature and voltage measurements in Hall cell anodes. Paper presented at the Proceedings of the TMS Light Metals, Las Vegas, Nevada, US.

    Google Scholar 

  37. Wong D, Welch B, Nunez P, Dion L, Spirin A (2019) Latest progress in IPCC methodology for estimating the extend of PFC greenhouse gases co-evolved in the aluminium reduction cells and challenges in reducing these emissions. Paper presented at the Proceedings of the International ICSOBA Conference, Krasnoyarsk, Russia.

    Google Scholar 

  38. Tarcy G, Tabereaux A (2011) The initiation, propagation and termination of anode effects in Hall-Heroult cells. Paper presented at the Proceedings of the TMS Light Metals, San Diego, California, US.

    Google Scholar 

  39. Zarouni A, Reverdy M, Zarouni AA, Venkatasubramaniam KG (2013) A study of low voltage PFC emissions at DUBAL. Paper presented at the Proceedings of the TMS Light Metals, San Antonio, Texas, USA.

    Google Scholar 

  40. Cheung C-Y, Menictas C, Bao J, Skyllas-Kazacos M, Welch BJ (2013) Characterization of individual anode current signals in aluminum reduction cells. Industrial & Engineering Chemistry Research. 52(28):9632–9644.

    Article  CAS  Google Scholar 

  41. Zarouni A, Al Zarouni A (2011) DUBAL’s experience of low voltage PFC emissions. Paper presented at the Proceedings of 10th Australasian Aluminium Smelting Technology Conference, Launceston, Tasmania, Australia.

    Google Scholar 

  42. Puzanov II, Zavadyak AV, Klykov VA, Makeev AV, Plotnikov VN (2016) Continuous monitoring of information on anode current distribution as means of improving the process of controlling and forecasting process disturbances. Journal of Siberian Federal University. Engineering & Technologies. 9(6):788.

    Google Scholar 

  43. Marks J, Bayliss C (2012) GHG measurement and inventory for aluminum production. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  44. Marks J, Nunez P (2018) Updated factors for calculating PFC emissions from primary aluminum production. Paper presented at the Proceedings of the TMS Light Metals, Phoenix, Arizona, USA.

    Google Scholar 

  45. Wong DS, Fraser P, Lavoie P, Kim J (2015) PFC emissions from detected versus nondetected anode effects in the aluminum industry. JOM. 67(2):342–353.

    Article  CAS  Google Scholar 

  46. Li W, Chen X, Yang J, Hu C, Liu Y, Li D, Guo H (2012) Latest results from PFC investigation in China. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  47. Wong C-J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ, Jassim A (2021) Modeling Anode Current Pickup After Setting. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  48. Wong C-J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ, Jassim A, Mahmoud M, Arkhipov A (2021) Modelling of Coupled Mass and Thermal Balances in Hall-Heroult Cells During Anode Change. Journal of the Electrochemical Society. 168(21):123506.

    Article  CAS  Google Scholar 

  49. Jassim A, Akhmetov S, Welch B, Skyllas-Kazacos M, Bao J, Yao Y (2016) Studies on anode pre-heating using individual anode signals in Hall-Heroult reduction cells. Paper presented at the Proceedings of the TMS Light Metals, Nashville, Tennessee, USA.

    Google Scholar 

  50. Wong C-J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ, Jassim A (2020) Study of heat distribution due to ACD variations for anode setting. Paper presented at the Proceedings of TMS Light Metals, San Diego, California, USA.

    Google Scholar 

  51. Jakobsen SR, Hestetun K, Hovd M, Solberg I (2001) Estimating alumina concentration distribution in aluminium electrolysis cells. IFAC Proceedings Volumes. 34(18):303–308.

    Article  Google Scholar 

  52. Hestetun K, Hovd M (2005) Detecting abnormal feed rate in aluminium electrolysis using extended Kalman filter. IFAC Proceedings Volumes. 38(1):85–90.

    Article  Google Scholar 

  53. Yao Y, Cheung C-Y, Bao J, Skyllas-Kazacos M (2015) Monitoring local alumina dissolution in aluminum reduction cells using state estimation. Paper presented at the Proceedings of the TMS Light Metals, Orlando, Florida, USA.

    Google Scholar 

  54. Yao Y, Cheung C-Y, Bao J, Welch BJ, Skyllas-Kazacos M, Akhmetov S, Jassim A (2017) Method for estimating dynamic state variables in an electrolytic cell suitable for the Hall-Heroult electrolysis process. Patent number WO 2017/141134 A1.

    Google Scholar 

  55. Yao Y, Bao J (2018) State and parameter estimation in Hall-Heroult cells using iterated extended Kalman filter. IFAC-PapersOnLine. 51(21):36–41.

    Article  Google Scholar 

  56. Wong C-J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ, Jassim A, Mahmoud M (2021) Discretized Thermal Model of Hall-Heroult Cells for Monitoring and Control. IFAC-PapersOnLine. 54(11):67–72.

    Article  Google Scholar 

  57. Shi J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ (2020) Multivariable Feeding Control of Aluminum Reduction Process Using Individual Anode Current Measurement. IFAC-PapersOnLine. 53(2):11907–11912.

    Article  Google Scholar 

  58. Shi J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ, Jassim A, Mahmoud M (2021) A New Control Strategy for the Aluminum Reduction Process Using Economic Model Predictive Control. IFAC-PapersOnLine. 54(11):49–54.

    Article  Google Scholar 

  59. Shi J, Yao Y, Bao J, Skyllas-Kazacos M, Welch BJ, Jassim A, Mahmoud M (2022) Advanced Model-Based Estimation and Control of Alumina Concentration in an Aluminum Reduction Cell. JOM. 74(2):706–717.

    Article  Google Scholar 

  60. Wang R, Bao J, Yao Y (2019) A data-centric predictive control approach for nonlinear chemical processes. Chemical Engineering Research and Design. 142:154–164.

    Article  CAS  Google Scholar 

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Acknowledgements

The authors acknowledge the financial and technical support from Emirates Global Aluminium and Jebel Ali Operations, as well as thank Mr. John Lam for the technical expertise.

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Correspondence to Jie Bao .

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Wong, CJ. et al. (2023). A Smart Individual Anode Current Measurement System and Its Applications. In: Broek, S. (eds) Light Metals 2023. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22532-1_6

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