Authors: A. Krasavtsev, K. Quigley, J.B. Hyde, I. Cameron, Hatch Ltd., and L. Jones, D.Vanmarrum, J.Tuomi, D.Dutta, D.Thibodeau, P.Kuuskman, Essar Steel Algoma Inc.
Abstract
In July 2007, Essar Steel Algoma shut down its only operating blast furnace, BF7 for a planned replacement of the furnace lining. As a single blast furnace plant, the entire steel works was idled awaiting the completion of the repair stop and successful blow-in. To reduce the associated business risk, Essar Steel Algoma and Hatch performed a detailed evaluation of blow-in options, benchmarked these against known blow-in procedures and finalized a blow-in plan well in advance of the furnace shutdown. The final blow-in plan was faster than previous experienced and aimed to produce hot metal of acceptable quality for steelmaking within 50h after wind was put on the furnace.
Blast Furnace 7 was blown-in on August 23, 2007 and resumed normal operations at an accelerated rate. In-spite of two unplanned stops, the furnace produced usable hot metal within 75h from wind on. Regular steel plant operations resumed quickly as the blast furnace ramped-up to its normal production rate.
This paper describes the blow-in methodology and safeguards taken to assure a successful start-up. The blow-in method selected, burdening options developed, contingency plans set in place and actual results are presented.
