To optimize the structure and injection position of top submerged lance, a three-dimensional gas-liquid two phases flow model in hot metal ladle is established based on Euler-Euler approach. The effects of the orifices arrangement, immersion depth and eccentricity of lance on the mixing time and gas total volume in ladle are investigated. A water model experiment is conducted to investigate the bubbles distribution and mixing time. The results show that, the predicted bubbly plume and mixing time agree well with the experimental photos and measured data. When the separation angle decreases from 180 deg to 45 deg, the symmetrical liquid flow field is destroyed, and a large circulation is formed in ladle. Meanwhile, the liquid velocity at the bottom of ladle becomes intense. As the separation angle reduces, the mixing time initially decreases follow by an increase, while the gas total volume becomes smaller. At a deeper immersion depth, the liquid velocity at the bottom of ladle and gas total volume are bigger. The mixing time reaches its minimum when the immersion depth is 740 mm. With the increasing of eccentricity, the liquid velocity becomes more uniformity, and the mixing time and the gas total volume in hot metal ladle gradually decrease. It is recommended to use the submerged lance with separation angle of 90 deg, immersion depth of 740 mm and eccentricity of 0.2 in present system.
展开▼
