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Clean Technologies and Environmental Policy

, Volume 7, Issue 4, pp 236–244 | Cite as

NO x emission from electric arc furnace in steel industry: contribution from electric arc and co-combustion reactions

  • Marcus KirschenEmail author
  • Lukas Voj
  • Herbert Pfeifer
Original Paper

Abstract

Off-gas measurements were conducted at industrial electric arc furnaces (EAF) in Germany in order to investigate the interrelation of NO x emission with installed plant equipment (e.g. gas burner) and process data (e.g. carbon input). Off-gas data monitor rapid changes in off-gas composition, temperature, and volume flow rates of air into the furnace indicating the transient state batch process of scrap melting. From the measurements two distinct sources of NO x emission are clearly distinguished: (1) NO x formation in the electric arc plasma during the start-up period of the melting process in an oxidizing furnace atmosphere after the charging of the furnace. (2) NO x formation from post-combustion of CO/CO2/H2 gas with air inside and outside the furnace. Whereas the contribution from arc ignition is similar for different types of EAFs, other contributions depend on furnace equipment and operation, e.g. gas burners, use of air as carrier medium for carbon or dust injection, air-tightness of furnace, and parameters of off-gas extraction by EAF dedusting system. The positive effect of the minimum volume flow rate of air into the furnace by controlled off-gas extraction to total NO x emission is shown.

Keywords

Electric arc furnace NOx emission Pollution control Off-gas analysis 

References

  1. Agarwal JC, Jessiman NS (1992) Nitrogen oxide emission in the steel industry. Iron Steelmaker 19(8):23–24Google Scholar
  2. Capitelli M, Ferreira CM, Gordiets BF, Osipov AI (2000) Plasma kinetics in atmospheric gases. Springer, BerlinGoogle Scholar
  3. Chan E, Riley M, Thomson MJ, Evenson EJ (2004) Nitrogen oxides (NOx) formation and control in an electric arc furnace (EAF)—analysis with measurements and computational fluid dynamics (CFD) modeling. ISIJ Int 44(2):429–438CrossRefGoogle Scholar
  4. Englund K (2002) Quantification of the discharge of nitrous fumes from the steelplant of AB sandvik steel, Department of Chemical and Metallurgical Engineering, Lulea University, SwedenGoogle Scholar
  5. Environmental Protection Agency, Emission Standard Division (1994) Alternative control techniques document—NOx emissions from iron and steel mills, Report EPA-453/R-94–065, p. 159Google Scholar
  6. Environmental Protection Agency, Office of Air and Radiation Clean Market Programs (2004) NOx budget trading program. 2003 Progress and compliance report. US Environmental Protection Agency, p. 24Google Scholar
  7. Goodfellow H, Evenson EJ, Li X, Mathur P, Thomson M (2000) NOx emissions from EAF steel making—assessment and abatement. 58th Electric furnace conference; Iron and steel society conference proceedings, p. 117–126Google Scholar
  8. IPPC (2001) European Commission, Integrated Pollution Prevention and Control (IPPC) Best available techniques reference document on the production of iron and steel, p. 355Google Scholar
  9. Jörss W, Handke V (2003) Emissionsschätzung für SO2, NOx, NMVOC und NH3 in Deutschland 2000–2020. Studie im Auftrag des Umweltbundesamtes, BerlinGoogle Scholar
  10. Kirschen M, Pfeifer H, Wahlers F, Mees H (2001) Off-gas measurements for mass and energy balances of stainless steel EAF, 59th Electric furnace conference, iron and steel society conference proceedings, p. 737–745Google Scholar
  11. Kirschen M, Kühn R, Lenz S, Loh J, Pfeifer H, Schaefers K, Wahlers F (2004) Off-gas measurements at primary dedusting systems of electric arc furnaces. Stahl und Eisen 124(11):73–89Google Scholar
  12. Kirschen M, Voj L, Pfeifer H (2005) NOx emission from the electric arc furnace: measurements and modelling, AISTech 2005—the iron and steel technology conference and exposition, Association for iron and steel technology conference proceedings, p. 585–595Google Scholar
  13. Malikov GK, Lisienko VG, Malikov KY, Viskanta R (2002) A mathematical modeling and validation study of NOx emissions in metal processing systems. ISIJ Int 10(2):1175–1181CrossRefGoogle Scholar
  14. Rentz, O, Hähre S, Jochum R, Spengler T (1997) Report on best available techniques (BAT) in the electric steelmaking industry. Report on behalf of the German federal environmental agency, Berlin (UBA), French-German institute for environmental research, University of Karlsruhe (TH), p 104Google Scholar
  15. TALuft (2003) Erste Allgemeine Verwaltungsvorschrift zum Bundes-Immissionsschutzgesetz (Technische Anleitung zur Reinhaltung der Luft TA Luft), BerlinGoogle Scholar
  16. Taylor M, Sink M (2002) Emission factor documentation for AP-42 section 12.5.1, iron and steel production—minimills. Alpha-Gamma Technologies, 34 pGoogle Scholar
  17. Warnatz J, Maas U, Dibble RW (1999) Combustion. Springer, BerlinzbMATHGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Institute for Industrial Furnaces and Heat EngineeringRWTH Aachen UniversityAachenGermany

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