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This research on heat and mass transfers between the various phases present in the converter concentrates on a knowledge of the characteristics of the gaseous phase in the convertor and on the melting mechanisms of coolant additions. Concerning gas flow and the mechanisms governing post-combustion, this research quantitatively confirms the favourable effect on the post-combustion ratio of increasing the oxygen lance height and reducing the oxygen blowing rate. Using a mobile probe, it was possible to sample and analyse the gas around and inside the oxygen jet. The influence of the refining path and the bottom stirring flow was studied. A map of gas temperatures and compositions in the converter was drawn. Experiments were carried out to measure the melting time for pieces of scrap and solid pig iron in various converters. By means of a dynamic model, the impact of unmelted material was evaluated as a function of charging conditions and refining control. Applications show: - Greater flexibility of melting when part of the cooling agents are introduced in the form of ore; - The adverse effects of mixing heavy and light scrap; - The very weak influence of preheating of heavy scrap on its dissolution rate.

Additional information

Authors: GROSJEAN J C, IRSID, Saint-Germain-en-Laye (FR)
Bibliographic Reference: EUR 11679 FR (1988) MF, 98 pp., ECU 4, blow-up copy ECU 12.56
Availability: (2)
ISBN: CD-NA-11679-FR-C
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