120 t顶底复吹转炉水力学模拟实验研究

以120 t顶底复吹转炉进行水力学模拟实验,研究单顶吹条件下枪位、顶吹流量对熔池混匀时间、冲击直径和冲击深度的影响;单底吹条件下底吹流量、熔池深度和底部供气元件布置对熔池混匀时间的影响;顶底复吹条件下最佳因素和水平。结果表明:单顶吹时枪位为1 000 mm时混匀时间最短;单底吹时底吹流量为750 Nm3/h时混匀时间最短,底部供气元件布置对混匀时间影响较大;顶底复吹时底吹流量对混匀时间影响最大,而枪位对混匀时间影响最小,当底部布置方式为喷孔在一条直线上对称分布时,顶吹流量为10 000 Nm3/h,底吹流量为600 Nm3/h,顶枪枪位为800 mm,熔池深度为800 mm时,熔池混匀效果最佳。

Hydraulic Simulation Study of 120 t Top-Bottom Combined Blowing Converter

Conducted a hydraulic model experiment on 120 t top-bottom combined blowing converter. Studied the impacts of lance height and top gas flowrate on the mixing time, the penetrating depth and cavity diameter under the top blowing condition and the impacts of bottom gas flowrate, bath depth and bottom tuyeres layout on the mixing time in the bottom blowing condition. Researched the optimal factor and level under the top-bottom combined blowing condition. The results show that: In top blowing conditions, 1 000 mm is the best lance height to get the shortest mixing time; In bottom blowing conditions, 750 Nm3/h is the best bottom gas flow rate and get the shortest mixing time, the bottom tuyeres layout is of great influence on mixing time, but not the more the better; In the condition of top-bottom combined blowing, the bottom gas flowrate has the greatest influence on mixing time, and the lance height have the smallest influence on mixing time. And the bath mixing result is optimal when the nozzle holes are in a symmetric distribution line, the top gas flowrate is 10 000 Nm3/h, the bottom gas flowrate is 600 Nm3/h, the lance height is 800 mm and bath depth is 800 mm.