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The wear of converter stirring plugs and the tuyere gas injection: a study by high temperature modelling
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1995 (English)In: Scaninject VII: 7th International Conference on Refining Processes, Luleå, Sweden, June 7-8, 1995, MEFOS , 1995, Vol. II, 257-282 p.Conference paper, Published paper (Refereed)
Abstract [en]

To obtain more information on wear mechanisms of stirring plugs for oxygen converters, the present authors carried out wear tests of MgO-C bricks at 1550 deg C for approx6 h. Tubular tuyeres were used to inject argon gas into liquid metal contained in crucibles. The wear examinations show that mechanical stresses aided by thermal and chemcial stresses are mainly responsible for the brick wear which result in two wear patterns on brick surfaces: the deep wear or back-attack wear and the shear wear. A new criterion, M exp *' , is defined by the ratio of the injected gas mass flowrate, m, to the critical flowrate, m exp * . The M exp *' better characterises the properties of gas-liuqid systems and relates the high wear of the bricks directly to condition changes for gas injection at/near tuyere outlet. The brick wear rates, W sub r , were shown to increase with M exp *' up to a M exp *' value near to one and become constant or decreasing as the M exp *' -values are further increased. Based on results from the present study, tuyeres with i.d. < =2 mm should be operated with M exp *' -values ranging from 0.15-0.45 in order to reduce the wear of plug refractory and to achieve optimum plug operations

Place, publisher, year, edition, pages
MEFOS , 1995. Vol. II, 257-282 p.
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-39002Scopus ID: 29388475Local ID: d935e780-bf8f-11dd-875e-000ea68e967bOAI: oai:DiVA.org:ltu-39002DiVA: diva2:1012510
Conference
International Conference on Refining Processes, Scaninject : 07/06/1995 - 08/06/1995
Note
Godkänd; 1995; Bibliografisk uppgift: The conference was organized by MEFOS; 20081201 (yang)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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