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Radio-wave interferometry (AWl) is a microwave technology transferred from radio astronomy and applied to steel making process control where it has been made to operate under extremely harsh conditions inside a blowing BOS converter. It has demonstrated a unique capability for directly measuring the height of the (slag/gas/metal) emulsion and its dense metallic component during BOF operation and to indicate the dynamic processing events and metallurgical changes that occur during the refining process. These measurements have been largely corroborated by other dynamic, but indirect, process signals such as audio and dc/dt, and by static data analysis.

During the course of this work, considerable amounts of vessel hood skulls, located in and around the RWI unit access port, tended to attenuate the RWI microwave signals, thereby severely limiting its successful application. Consequently, mathematical and physical modelling and practical experimentation were applied to try to alleviate this major problem. However, these efforts met with only limited success. Improved vessel hood design or reciting the unit to a position that is less prone to long-term hood skulls have been forwarded as possible solutions, but the problem needs to be solved before RWI can be generally applied as an operator aid for steel making process control.

If a solution can be found to prevent extensive and prolonged hood skulling, then this could extend RWI technology into 3D imaging of the contents of the blowing converter. er.

Additional information

Authors: MILLMAN M.S, Corus UK Ltd European research, Swinden Lab., Rotherham (UK);MALMBERG D, MEFOS, Lulea (SE);BAATH L, University of Halmstad (SE)
Bibliographic Reference: EUR 19473 EN (2001), pp.118. Euro: 17.50
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN: 92-894-1124-4
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