Numerical simulation research on molten steel flow under different gas flow rates in the eccentric bottom tapping zone of electric arc furnace
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摘要: 底吹工藝在電弧爐煉鋼過程中的應用能有效縮短熔池混勻時間, 加速碳、磷、硫的去除, 提高生產效率及產品質量.本文利用數值模擬軟件模擬了EBT (偏心底部出鋼) 區底吹孔不同氣體流量下的電弧爐鋼液速度場, 發現當EBT區域底吹氣體流量從100 L·min-1升至267 L·min-1 (其他兩孔氣體流量穩定保持為133 L·min-1) 時, EBT區域鋼液的平均流速由2.805×10-3m·s-1升至3.268×10-3m·s-1, 鋼液整體平均流速由4.126×10-3m·s-1升至4.610×10-3m·s-1, 并耦合得出EBT區域不同底吹流量下的鋼液流動速度經驗公式.由于鋼液流動是影響熔池內反應的動力學因素, 本文提出了電弧爐煉鋼基于底吹熔池攪拌的碳成分預報模型, 為冶煉終點均勻熔池成分、合理供氧操作提供理論建議.Abstract: The application of the bottom-blowing process in electric arc furnace (EAF) steelmaking process can shorten the mixing time of the molten bath effectively;accelerate the removal of carbon, phosphorus, and sulfur;as well as improve the production efficiency and product quality.The velocity field of molten steel flow under different gas flow rates in eccentric bottom tapping (EBT) zone of EAF was simulated using simulation software.The average velocity of molten steel in the EBT zone was increased from 2.805×10-3■flow rates in EBT zone were increased from 100 to 267 L·min-1 (the rest gas flow rates were maintained at 133 L·min-1) .An empirical formula of gas flow rates in EBT and molten steel flow was obtained.A prediction model for carbon content was proposed based on molten steel stirred via bottom blowing during the EAF steelmaking process.This provided theoretical suggestions for the homogeneity of bath and reasonable oxygen supply considering that the kinetic factor of reactions in the bath was the molten steel flow at the end point of smelting.
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Key words:
- bottom-blowing of EAF /
- EBT zone /
- fluid flow of molten steel /
- numerical simulation
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參考文獻
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