Combustion and motion of coke and gases at blast-furnace tuyeres |
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Authors: | V G Druzhkov V K Kropotov I E Prokhorov E M Kadyrova I V Makarova |
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Affiliation: | 1.Nosov Magnitogorsk State Technical University,Magnitogorsk,Russia |
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Abstract: | The issues relating to coke circulation at the air tuyeres in high-productivity blast furnaces may be elucidated by systematic
analysis of literature and production data and model experiments. Research on the forces associated with cavity formation
and destruction in combustion ahead of the tuyeres indicates that three states are possible in the combustion zone: stability,
instability, and collapse. In the stable state, when the uplift force of the gases from the cavity significantly exceeds the
vertical pressure of the batch column, there will be no coke circulation. Coke circulation occurs in the unsteady state and
at collapse. Rationalization of the terminology is proposed. In mechanical terms, it is expedient to divide the combustion
zone into loose and dense sections, rather than into a circulation zone and a dense section. |
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