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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: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 24, no 5-6, p. 242-254Article in journal (Refereed) Published
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°C for about 6 h. Tubular tuyeres were used to inject Ar gas into liquid metal contained in crucibles. The wear examinations show that mechanical stresses aided by thermal and chemical 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* prime , is defined by the ratio of the injected gas mass flowrate, m, to the critical flowrate, m*. The M* prime better characterises the properties of gas-liquid systems and relates the high wear of the bricks directly to condition changes for gas injection at/near tuyere outlet. The brick wear rates, Wr, were shown to increase with M* prime up to a M* prime value near to unity, and become constant or decreasing as the M* prime -values are further increased. Based on results from the present study, tuyeres with i.d. <=2 mm should be operated with M* prime -values ranging from 0.15 to 0.45 in order to reduce the wear of plug refractory and to achieve optimum plug operations

Place, publisher, year, edition, pages
1995. Vol. 24, no 5-6, p. 242-254
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-7236Local ID: 590ff9f0-fcbd-11dc-a946-000ea68e967bOAI: oai:DiVA.org:ltu-7236DiVA, id: diva2:980125
Note
Godkänd; 1995; 20080328 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Yang, QixingBjörkman, Bo

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