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| Geometric structure optimization of impeller for KR desulfurization |
| JIA Shu-yuan1,2, WANG Rui-zhi3, OUYANG De-gang4, SHANG Shao-wei1,2, WANG Qiang1,2, HE Zhu1,2 |
1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
3. Baosteel Central Research Institute, Shanghai 201900,China;
4. Research and Development Center of Wuhan Iron and Steel Co., Ltd., Baosteel Central Research Institute, Wuhan 430083, Hubei, China |
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Abstract The KR (kanbara reactor) method is the preferred process for stable and deep desulfurization in the pretreatment stage of molten iron and is widely used in the modern steelmaking industry. The mixing of the molten iron and the desulfurizer is driven by stirring the blades immersed in the molten iron, which will benefit good dynamic conditions. However, the desulfurizer will coagulate in large quantities before participating in the reaction by the forced vortex zone at the stirring stage, making its utilization rate low. Two easy-to-use impellers (staggered impeller and high-low impeller) were designed, of which purpose is to strengthen the axial flow near the blade by the height difference of adjacent blades, which destroy the flow characteristics in the forced vortex zone and enhance the relative motion between molten iron elements. Thereby, the adverse impact of the forced vortex zone on the KR desulfurization mixing effect was reduced, and the mixing effect of molten iron and desulfurizer was increased. In the meantime,the VOF (volume of fluid) and DPM (discrete phase model) models are used to establish the three-dimensional transient mathematical model of the KR mixing process. The numerical results depict that the influences of the traditional four-blade impeller and two new types of impellers on the hot metal flow, particle dispersion, dead zone range, and the proportion of particles below the hot metal surface were analyzed and compared. The numerical simulation results show that the new impeller can provide more axial speed than the traditional impeller. The staggered impeller and the high-low impeller enhance the dispersion degree of the desulfurizer, and their Sigma values wereproposed to quantify the particle dispersion are lower than those of the conventional impeller by about 9.49% and 14.18%, respectively. The average particle size of the desulfurizer after desulfurization is reduced by approximately 14.91% and 13.38%, respectively, compared with the traditional impeller conditions. A 300 t industrial experiment was carried out on the high-low impeller in the Baoshan base steelmaking plant of Baosteel Co., Ltd. Furthermore, the average unit sulfur consumption of the high-low type impeller was reduced by 0.27 kg compared with the traditional impeller in the same period.
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Received: 24 August 2022
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2023, Vol. 58 
