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This study aimed at a better understanding of wear mechanisms of converter bottom tuyeres with combined blowing. In this perspective, various investigation means were developed: analysis techniques, continuous measurement and modelling.

The possibility of measuring tuyere length using reflectometry was considered. The results obtained show that, under industrial conditions, the reflectometer is not sufficient for this measurement. It is necessary to associate signal processing.
Industrial instruments were installed to follow and analyse the heat phenomena that take place in the tuyere zone. The measurements realized show that the thermal shocks which take place at the level of the tuyere zone are mainly responsible for tuyere wear. It is this thermal shock which must be controlled. Various means were tested to achieve this: modulation of tuyere gas flow, reduction of fuel flow, converter maintenance. An effective reduction was noted only in the case of converter maintenance. This aspect is much more efficient when the slag formed has a good aptitude for sticking.
A modelling approach (for heat stresses and dynamic heat models) also suggested means for trying to reduce thermal shocks. The proposals were tested on site, but the results obtained were not conclusive. ve.

Additional information

Authors: ROTH J, Institut de recherches de la sidérurgie française, Maizières-les-Metz (FR)
Bibliographic Reference: EUR 16038 FR (1997) 51pp., FS, ECU 10
Availability: Available from the (2)
ISBN: ISBN 92-828-0230-2
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