Effect of top and bottom blowing conditions on spitting in converter

Engineering Reports

Shota Amano¹  Shingo Sato²  Naoki Kikuchi³  Yukio Takahashi⁴ 

[1] Business Sec, Business Planning Department, Global Business Development Division JFE Steel Corporation Tokyo 100‐0011 Japan;Cyber‐Physical System R&D Department JFE Steel Corporation, Steel Research Laboratory Kawasaki Japan;Steelmaking Research Department JFE Steel Corporation, Steel Research Laboratory Hiroshima Japan;West Japan Solution Division JFE Techno‐Research Corporation Hiroshima Japan;

关键词: bottom blowing;    converter;    oxygen steelmaking;    spitting;    top blowing;    water model;   

DOI  :  10.1002/eng2.12406

来源: DOAJ

【 摘 要 】

Abstract The effect of top blowing and bottom blowing conditions on spitting behavior was investigated by water model experiments and numerical calculation. The results of the water model experiment showed that reducing the jet velocity by using a larger nozzle diameter was effective for reducing spitting. The numerical calculation indicated that interference between the top blown gas jet and the bottom blowing plume increases the gas velocity at the rim of the cavity, causing heavier spitting. A new index using the geometrical locations of the neighboring cavity and plume was proposed. The spitting rate decreased under conditions with lower interference by avoiding interaction between the top blown gas jet and the bottom blowing plume. The energy distribution in the blowing process was discussed based on a water model experiment using bath mixing time, bath vibration, and the spitting rate. The energy for spitting was explained convincingly by the difference between the energy input and the energy of bath vibration, cavity formation, and bath mixing. The results implied lower interference of the top and bottom gas resulted in lower energy for spitting generation.

【 授权许可】

Unknown