IngentaConnect Effect of oxyfuel burner ratio changes on energy efficiency in el...

Authors: Thomson, M.J.¹; Kournetas, N.G.²; Evenson, E.³; Sommerville, I.D.²; McLean, A.²; Guerard, J.⁴

Source: Ironmaking & Steelmaking, Volume 28, Number 3, June 2001 , pp. 266-272(7)

Abstract:

Trials were conducted on Co-Steel Lasco's electric arc furnace (EAF) to evaluate the effect of oxyfuel burner ratio changes on furnace energy efficiency and productivity. Carefully controlled trials with the collection of numerous process and sample data over 331 heats provided statistically significant results. The oxygen available for post-combustion in the furnace was increased by 19%. As the burners were operating at their maximum oxygen constraint, this was achieved by decreasing the natural gas consumption by 43%. Results of this study indicate that decreases in terms of specific electrical energy consumption (4·0%), power on time (5·0%), and tap to tap time (4·5%) were realised. Slag chemistry, electrode consumption, and yield were not affected. Measurement data support the finding that more heat was transferred into the steel with the post-combustion burners: a flat bath was achieved earlier; high bath temperatures were reached more quickly; power on time was reduced, leading to reduced electrical energy consumption. Analysis suggests that furnace thermal energy losses were reduced by less air inleakage, less incomplete methane combustion, and earlier achievement of foamy slag conditions.

Document Type: Regular paper

DOI: 10.1179/030192301678136

Affiliations: 1: The Department of Mechanical and Industrial Engineering 2: The Department of Metallurgy and Materials Science, University of Toronto, 5 Kings College Road, Toronto, ON, Canada M5S 3G8 3: Stantec Global Technologies Ltd, Mississauga, Canada 4: Co-Steel Lasco, Whitby, Canada

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Effect of oxyfuel burner ratio changes on energy efficiency in electric arc furnace at Co-Steel Lasco