Abstract
Ladle soft blowing plays an important role in the removal of non-metallic inclusions in liquid steel. In the present work, a CFD-PBM coupling model was established to simulate the soft blowing process in a 180t ladle. The turbulence behavior of gas and liquid phases in the ladle was accurately described, and the turbulent collision and coagulation of medium and small size inclusions in liquid steel were investigated. The results show that the inclusion size is generally smaller than the Kolmogorov microscale with the argon blowing rate of 100–200 NL/min, and the inclusion motion mainly depends on the molecular viscous action. After soft blowing for 5 min, the collision and coagulation behaviors are obvious, and the number density of small inclusions is significantly reduced. For the gas flow rate of 200 NL/min, the average diameter of inclusion increases from 3.94 to 4.25 μm, and the number density of 2-10 μm inclusions decreases from 1.0383 × 1013 to 4.4847 × 1012 per m3, which decreases by 56.81%.KeywordsInclusionCoagulation and growthSoft blowingTurbulenceNumerical simulation
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