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


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.


Electric arc furnace NOx emission Pollution control Off-gas analysis 


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

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

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