210t转炉底吹供气参数优化模拟研究

摘要：为优化某厂210t转炉底吹供气效果，利用气 液两相流相互作用数值模拟方法，研究了底吹元件数量、布置方式和供气强度变化对熔池搅拌效果的影响。通过对8支、10支、12支底吹元件数量下的作用效果分析，得出12支底吹元件布置在0.63D(D为熔池直径)的同心圆上时，熔池内钢液流动相对较稳定，“死区”比例最低，混匀时间最短。随着底吹强度增大，“死区”面积减少，混匀时间缩短，气流对炉底的侵蚀作用加剧。底吹强度为0.05m3/（min·t）时，“死区”比例为23.9%，底吹强度为0.10m3/（min·t）时，“死区”面积大幅降低，进一步提高至0.20m3/（min·t）时，“死区”比例降低至4.6%；当底吹强度增加至0.15m3/（min·t）时，熔池混匀时间大幅降低至30s，继续提高底吹强度，混匀时间降幅不大，将底吹强度控制在0.10~0.15m3/（min·t）之间比较合理。

Simulation study on optimization of bottom blown gas supply parameters in 210t converter

In order to optimize the bottom blown gas supply effect of a 210t converter in a plant, the numerical simulation method of gas liquid two phase flow interaction was used to study the influence of the number of bottom blown elements, the arrangement mode and the change of gas supply intensity on the mixing effect of the molten pool. By analyzing the effect of 8, 10, 12 bottom blown gas elements, it is concluded that when 12 bottom blowing elements are arranged on the concentric circle of 0.63D, the molten steel flow in the pool is relatively stable, "dead zone" rate is the lowest and the mixing time is the shortest. As the bottom blown gas intensity increases, the area of "dead zone" decreases, the mixing time is shortened and the erosion effect of air flow on furnace bottom is intensified. When the bottom blown gas intensity is 0.05m3/（min·t）, the “dead zone” ratio is 23.9%, and when the bottom blown gas intensity is 0.10m3/（min·t）, the “dead zone” area is greatly reduced. As the bottom blown gas intensity is further increased to 0.20m3/（min·t）, the proportion of "dead zone" is reduced to 4.6%. It is also found that when the bottom blown gas instensity is increased to 0.15m3/（min·t）, the mixing time of the molten pool is greatly reduced to 30s. And the bottom blown gas intensity is continued to be increased. The mixing time is not greatly reduced. Therefore, it is reasonable to control the bottom blown gas intensity between 0.10-0.15m3/（min·t）.