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LIGHT METALS AND CARBON MATERIALS
ArticleName Complex heat engineering calculation of gas removal in reduction cells with a soderberg anode
DOI 10.17580/tsm.2017.07.08
ArticleAuthor Shakhray S. G., Skuratov A. P., Dekterev A. A., Sharypov N. A.
ArticleAuthorData

Siberian Federal University, Krasnoyarsk, Russia:

S. G. Shakhray, Assistant Professor, Chair of Technosphere Safety of Mining and Metallurgical Production, e-mail: shahrai56@mail.ru
A. P. Skuratov, Professor
A. A. Dekterev, Assistant Proffessor
N. A. Sharypov, Senior Lecturer

Abstract

The gas removal system in reduction cells with a Soderberg anode has three main elements: a skirt for collection of anode gas, formed during electrolytic production of aluminum; a burner for afterburning of combustible components of anode gas; a gas flow network through which thermally neutralized anode gases are transported to gas treatment plants for final purification. The skirt is designed as a cast-iron section, hung around the perimeter of anode casing, which forms a gas channel together with the anode side surface and the melt surface. The gas collector is placed directly above the electrolyte and near the anode, i.e. at the point of emission of the pollutants, which enables a minimization of the volume of gases that are removed from the cell to 600–800 m3/h. At the same time, the volume of anode gases, formed during anode oxidation in modern aluminum reduction cells with a Soderberg anode, is  45 m3/h. The burning carbon monoxide and polycyclic aromatic hydrocarbons, released during the coking process of a Soderberg anode, are carried out in burners. These are cylindrical chambers with an anode gas supply pipe — equipped with air intake slots – in their lower part. The difference between the volume of the resulting anode gas and the volume of gases, removed from the cells, shows that the air is sucked into the burner through the air intake slots with an excess of α≥6, which has a negative effect on the stability of combustion. The gas supply network of the body of electrolysis is approximately 2–2.5 km long, and it contains a significant number of tees and sections with sudden flow expansion with a total hydraulic resistance of more than 2000 Pa, which consumes up to 30% of power generated by the exhaust fans. The paper presents the results of aerodynamic calculation of the skirt, the gas flow network, and a heat engineering calculation of afterburners. These calculations enable a comprehensive assessment of the effect that their geometric and operating mode parameters have on the efficiency and operational reliability of gas removal systems in cells with a Soderberg anode under conditions of an increasing current.

keywords Aluminum reduction cell, Soderberg anode, fume exhaust fan, system, skirt, afterburner, gas flow network, calculation, prediction, parameters
References

1. Shakhray S. G., Korostovenko V. V., Rebrik I. I. Improvement of bell fume exhaust systems on powerful Soderberg electrolyzers : monograph. Krasnoyarsk : IPK SFU, 2010. 146 p.
2. Available at: http://www.consultant.ru/document/cons_doc_LAW_53485/ (accessed: 19.06.2017)
3. Burkat V. S., Drukarev V. A. Reduction of atmospheric emissions during the aluminium production. Saint Petersburg : LLC “Lyubavich”, 2005. 275 p.
4. Pavlov K. F., Romankov P. G., Noskov A. A. Examples and tasks for the course of units and processes of chemical technology : tutorial for universities. 10-th edition, revised and enlarged. Leningrad : Khimiya, 1987. 576 p.
5. Dytnerskiy Yu. I. Basic processes and units of chemical technology. Design tutorial. Moscow : Khimiya, 1991. 496 p.
6. Shakhray S. G., Kulikov B. P., Petrov A. M. Gas-collection unit of aluminium electrolyser (methods). Patent RF, No. 2324012. Applied: 26.04.2006. Published: 10.05.2008. Bulletin No. 13.
7. Gontsov G. N. , Marinova O. A., Tananaev A. V. Turbulent flow on the site of round pipe turning. Gidrotekhnicheskoe stroitelstvo. 1984. No. 12. pp. 24–28.
8. Idelchik I. E. Hydraulic resistance reference book. Ed.: M. O. Shteynberg. Third edition, revised and enlarged. Moscow : Mashinostroenie, 1992. 672 p.
9. Barber M., Tabereaux A. T. The end of an era for Søderberg technology in North and South America. Light Metals. 2014. pp. 809-814. DOI: 10.1007/978-3-319-48144-9_136.
10. Ziganshin M. G., Kolesnik A. A., Posokhin V. N. Design of dust-and-gas purification units. Moscow : Ekopress-ZM, 1988. 505 p.
11. Shakhray S. G., Korostovenko V. V., Baranov A. N., Kaplichenko N. M. Burning unit of aluminium electrolyzer with intensive mixing of components. Patent RF, No. 2456380. Applied: 09.02.2011. Published: 20.07.2012. Bulletin No. 20.
12. Shakhray S. G., Skuratov A. P., Belyanin A. V., Kondratev V. V., Bezrukikh S. S., Rusanov N. V. Burning unit of aluminium electrolyzer with intensive mixing of components. Patent RF, No. 164940. Applied: 08.12.2015. Published: 27.09.2016. Bulletin No. 27.
13. Shakhray S. G., Bazhin V. Yu., Kondratev V. V., Belyanin A. V., Gron V. A. Unit for final burning of anode gases in aluminium electrolyzer. Patent RF, No. 2534712. Applied: 27.06.2013. Published: 10.12.2014. Bulletin No. 34.
14. Staskevich N. L., Severinets G. N., Vigdorchik D. Ya. Reference book for gas-supply and gase usage. Leningrad : Nedra, 1990. 762 p.
15. Klimova L. L., Pavlyuchenko G. A., Belov B. A. Comparative assessment of various burning units for aluminium electrolyzers. Tsvetnaya metallurgiya. 1979. No. 19. pp. 54–56.
16. Pomerantsev V. V., Arefev K. M., Akhmedov D. B. Basis of practical theory of burning: tutorial for universities. Leningrad : Energoatomizdat, 1986. 312 p.
17. Folkers A., Weerdt J., Klut P., Dupon E., Engel E. 15 Years of GTC Оperation at aldel: long-term assessment of GTC performance. Light Metals. 2014. pp. 629–633.
18. Verbraak Peter, Turco Travis, Klut Peter, Dupon Erik, Edo Engel. Pot gas cooling technologies. Light Metals. 2014. pp. 635–639.
19. Bouhabila E. H., Næss E., Kielland V. Einejord and Kolbeinn Kristjansson. An innovative compact heat exchanger solution for aluminum off-gas cooling and heat recovery. Light Metals. 2013. pp. 793–797.
20. Bouhabila E. H., Cloutier B., Malard T., Martineau P., Vendette H. Electrolytic cell gas cooling upstream of treatment center. Light Metals. 2012. pp. 545–550.
21. Khawla AlMarzooqi, Shaikha AlShehhi, Vijayakumar Pillai, Muna Abdulla, Sunny John, Padmaraj Gunjal, Bharat Gadilkar. Management and performance of the largest gas treatment centre at emal potline during major shutdown of main exhaust fans. Light Metals. 2016. pp. 447–452.

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