モデル実験による底吹き羽口におけるバックアタック現象の解消方法の検討(速度論および要素技術)(<特集>転炉機能の拡大)

概要

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Elimination of the back-attack phenomenon in the submerged gas jet, that is expected to decrease the erosion of bottom blowing tuyeres, was investigated in the water model and in the hot iron model. And the following results were obtained. 1) The back-attack phenomenon causes concave erosion in tuyere refractory. 2) The sum of impact pressure by the back-attack of a circular tuyere decreased beyond 19.6 bar (20kg/cm^2), and the frequency of that in a slit-shaped tuyere disappeared when the circumference ratio was greater than 3 in the water model. 3) The back-attack of a circular tuyere was observed in the hot iron model, and it was confirmed that the slit-shaped tuyere with the circumference ratio larger than 5 could eliminate the phenomenon completely.
社団法人日本鉄鋼協会の論文
1990-11-01