Effect of Impellers’ Shape on Bubbles Dispersion Characteristics in Stirring-Injection Desulfurization System of Hot Metal

抄録

Four types of impellers are developed to improve bubbles disintegration and dispersion characteristics in the desulfurization process of hot metal with stirring-injection method. The disintegration and dispersion behavior of bubbles are investigated by using the Euler two-phase flows approach coupled with the bubble population balance model. The bubbles transported sideward of different impellers and broken in the region near the top of impellers are well studied. Further, simulations have also been performed to understand the sensitivity of impellers types on rotation speed and surface tension. The results show that the square center impeller (impeller B) improves the flow structure of the hot metal, and makes the bubbles size much smaller than that of the other three impellers types. The blades with downward angle (impeller C and impeller D) improve the dispersion effect of the region near the impeller, and the impeller B is more sensitive to the change of the rotation speed. The best dispersion effect can be obtained by use of the impeller B, under the conditions of stirring speed with 30 rpm for 4 s switching.