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November 2008
Vol. 5, No. 11
Oxygen Steelmaking Technologies
About the Cover
The newly developed CONREP high-speed BOF gunning system in operation at ArcelorMittal Eisenhuettenstadt in Germany. RHI designed, supplied and installed the system for ArcelorMittal. Photograph courtesy of RHI
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Relationships Between Basic Oxygen Furnace Maintenance Strategies and Steelmaking Productivity
Hans Jörg Junger (left), director of marketing — steel, North America, RHI Canada Inc., Steel Division, Burlington, Ont., Canada (hansjoerg.junger@rhicanada.ca); Christoph Jandl (center), project manager — marketing, steel, North America, and Jürgen Cappel (right), director — Metallurgy Department, RHI AG, Steel Division, Vienna, Austria (christoph.jandl@rhi-ag.com, juergen.cappel@rhi-ag.com)
Standard North American and European BOF maintenance strategies are examined. Considerable cost savings can be achieved by optimizing vessel maintenance, and multiple approaches to realize improvements in this area are described. |
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Development of an Offgas/ Model Technology to Replace Sublance Operation for KOBM Endpoint Carbon Control at ArcelorMittal Dofasco
Stanley Sun (top left), principal researcher, Research and Development; Dongsheng Liao (top right), steelmaking specialist, and Neal Pyke (bottom left), KOBM/LM coordinator, Steelmaking Technology; and Kevin Boylan (bottom center), process automation analyst, and Glenn Wallace (bottom right), process automation analyst, Process Automation, ArcelorMittal Dofasco Inc., Hamilton, Ont., Canada (stanley.sun@arcelormittal.com, liao.dongsheng@arcelormittal.com, neal.pyke@arcelormittal.com, kevin.boylan@arcelormittal.com)
A unique offgas/model technology was developed to replace Dofasco’s expensive sublance operation for KOBM endpoint carbon control. Since May 2006, Dofasco’s KOBM has experienced higher reliability, lower carbon under/over-blow rates and lower tap oxygen content. |
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BOF Scrubber Enhancement and Secondary Emission Capture at Sparrows Point
Michael Vogler, environmental project engineer, Severstal Sparrows Point, Sparrows Point, Md. (michael.vogler@severstalna.com)
Sparrows Point upgraded its gas cleaning, recirculating scrubber water treatment, and solids handling facilities to meet MACT standards. With improvements on both the air side and the water and solids handling side, the installation has been far within MACT-imposed emission limitations. |
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Cost-Saving Operation and Optimization on Metallurgical Reactions in BOF Practice
Klaus Wünnenberg (left), steel consultant, Duisburg, Germany (klaus.wuennenberg@vodafone.de), and Jürgen Cappel (right), RHI AG, Vienna, Austria (juergen.cappel@rhi-ag.com)
Process control systems are frequently applied at the BOF to help achieve a consistent and low state of oxidation at tap. Methods and aspects of optimizing the various metallurgical reactions in the BOF steelmaking process are discussed. |
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Utilization of Sound Signals to Evaluate the Risk of Slopping in Oxygen Converters
Carlos Cicutti (top left), technological manager, and Mauro Martín (top right), researcher, Center for Industrial Research, Tenaris, Campana, Argentina (ccicutti@tenaris.com, mmartin@siderca.com); Roberto Donayo (bottom left), process manager, and Adolfo Gómez (bottom right), process engineer, Steelmaking Division, Ternium Siderar, San Nicolás, Argentina (rdonayo@terniumsiderar.com, agomez@terniumsiderar.com)
Ternium Siderar recently installed a commercial sensor that measures the sound originated during blowing. Based on results of the installation, an application to evaluate the risk of slopping for given process conditions was developed. |
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Modification and Revamp of BOF Converter B at Salzgitter Flachstahl GmbH
Ralf Kromarek, manager — BOF shop, Klaus-Dieter Hueske, manager — mechanical maintenance, and Andreas Berghöfer, general manager — meltshop, Salzgitter Flachstahl GmbH, Salzgitter, Germany (kromarek@salzgitter-ag.com); Jens Kempken (pictured), executive vice president — project development, Rolf Best, general manager — design and engineering, and Lars Meier, project director, SMS Demag AG, Düsseldorf, Germany (jens.kempken@sms-demag.com)
When Salzgitter Flachstahl commissioned its new converter B in April 2007, the converter capacity increased by more than 20%. The new vessel geometry led to significant improvements, including less slopping, longer lining lifetime and higher yields. |
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