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November
2007
Vol. 4, No. 11
Oxygen Steelmaking Technologies
About the Cover
Charging of the 200-ton LD/BOF converter at Taiyuan Iron & Steel (Group) Co. Ltd. (TISCO) in China. Siemens VAI designed, supplied and installed the converter for TISCO, a producer of stainless steel, cold rolled silicon sheet (coil) and hot rolled carbon steel coil/plate, among others. Photo courtesy of Siemens.
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33
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Application of CFD Modeling to the Design of Fume Control Systems in the Steel Industry
Tom Plikas, practice lead, and Jennifer Woloshyn, analyst, Specialized Engineering Analysis & Design Group, Hatch Ltd., Mississauga, Ont., Canada (tplikas@hatch.ca, jwoloshyn@hatch.ca); and Dale Johnson, Hatch Ltd., Pittsburgh, Pa. (djohnson@hatch.ca)
Traditional methods of designing emissions control systems are valid for a narrow range of conditions and are subject to scaling issues. Computational fluid dynamics (CFD) modeling, which more accurately simulates the dynamic release and distribution of fume in the full-scale environment, is now being used in system design. |
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33
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Application of CFD Modeling to the Design of Fume Control Systems in the Steel Industry
Tom Plikas, practice lead, and Jennifer Woloshyn, analyst, Specialized Engineering Analysis & Design Group, Hatch Ltd., Mississauga, Ont., Canada (tplikas@hatch.ca, jwoloshyn@hatch.ca); and Dale Johnson, Hatch Ltd., Pittsburgh, Pa. (djohnson@hatch.ca)
Traditional methods of designing emissions control systems are valid for a narrow range of conditions and are subject to scaling issues. Computational fluid dynamics (CFD) modeling, which more accurately simulates the dynamic release and distribution of fume in the full-scale environment, is now being used in system design. |
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44
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Stirring Strategies to Meet the Highest Metallurgical Requirements in the BOF Process
Ralf Bruckhaus (left), general manager — steel plant, and Helmut Lachmund (right), manager — research and development — steelmaking, AG der Dillinger Hüttenwerke, Dillingen, Germany (ralf.bruckhaus@dillinger.biz, helmut.lachmund@dillinger.biz)
The influence of the arrangement of bottom-stirring nozzles on flow conditions was investigated. Variations in the geometry of the oxygen lance tips improved metallurgical results in combination with the lime addition model. Further details of the study are discussed. |
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51
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Secondary Dedusting Systems With High-performance Gas Cooling and Explosion-proof Design
Alfred R. Hampel, senior process engineer, Siemens VAI Metals Technologies, Linz, Austria (alfred.hampel@siemens.com)
This paper describes a system with offgas coolers that allows a high hot metal charging speed and good control of the thermal power emissions during charging. Properly designed systems allow the use of scrap that carries a higher content of combustibles. |
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60
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The Methods, Aims and Practices (MAP) for BOF Endpoint Control
Bernard O. Chukwulebe (pictured), manager — steelmaking and refractories, ArcelorMittal Global R&D, East Chicago. Ind. (bernard.chukwulebe@arcelormittal.com); Key Robertson, senior staff engineer — process automation, No. 4 steel producing, and Jeff Grattan, manager, No. 3 steel producing, ArcelorMittal – Indiana Harbor, East Chicago, Ind.
BOF shop performance in the areas of productivity, cost and steel quality depend largely on efficient control of endpoint temperatures and chemistry. This paper compares various methods of endpoint control and emphasizes the importance of standardized practices, process automation and shop coordination. |
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71
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Advantageous Numerical Simulation of the Converter Blowing Process
Hans-Jürgen Odenthal (top left), manager — research and development, Jens Kempken (top right), executive vice president — steelmaking and continuous casting technology, and Jochen Schlüter (bottom left), vice president — research and development, SMS Demag AG, Düsseldorf, Germany (hans-juergen.odenthal@sms-demag.de, jens.kempken@sms-demag.de, jochen.schlueter@sms-demag.de); and William H. Emling (bottom right), vice president — steelmaking and continuous casting, SMS Demag LLC, Pittsburgh, Pa. (bill.emling@sms-demag.us)
A CFD model for converters was developed that considers several fluid dynamic aspects, such as the formation of melt cavities, the interaction of the melt-slag-gas phases and the heat transfer inside the refractory lining. The model is described in this paper. |
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90
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Repair of a BOF Trunnion Ring and Lamella Units at Ternium Siderar
Oscar Biga, technical manager, Sebastian Capote Lopes, steel plant workshop manager, Arnaldo Montaldo, steel plant BOFs maintenance manager, and Nestor Balbis, central workshop technician, Ternium Siderar, San Nicolas, Buenos Aires, Argentina (obiga@terniumsiderar.com, cscapotel@ternumsiderar.com, amontaldo@terniumsiderar.com, nbalbis@terniumsiderar.com)
In October 2005, the No. 2 converter at Ternium Siderar suffered a burn-through in the slagline under the trunnion shaft zone. This paper describes the reparation process, especially to the damaged lamellas, and the strategy to restart the converter in less than 45 days. |
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96
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2007 BOF Roundup |
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