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| Optimization simulation of injection process in 130 t DC electric arc furnace |
| WANG Dan1,2, GUO Zhi-hong3, HUO Yan-peng4, FAN Jian-tong4, ZHU Li-guang3 |
1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei, China;
2. Hebei High Quality Steel Continuous Casting Engineering Technology Research Center, Tangshan 063000, Hebei, China;
3. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;
4. Converter Steelmaking Plant, Shijiazhuang Iron and Steel Co., Ltd., Shijiazhuang 050031, Hebei, China |
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Abstract Under the background of healthy economic development, EAF steelmaking has gradually become the object of vigorous development of major iron and steel enterprises with its characteristics of low pollution, short process and diverse products. It plays an important role in the whole iron and steel production than ever before, and the flow state of EAF molten pool will directly affect the smelting effect of EAF. It is mainly related to the injection intensity and arrangement of oxygen lance. In order to study the change of flow field of electric arc furnace under different working conditions and select the most appropriate process parameters for large electric arc furnace, taking a 130 t electric arc furnace in a plant as the prototype, the side blowing model and three-dimensional full-scale geometric model of electric arc furnace are established. The mixing time, average velocity, turbulent kinetic energy distribution. Based on the volume ratio of dead zone and weak flow zone, the effects of different injection intensity and arrangement on the flow field of 130 t electric arc furnace were systematically studied. The results show that when the arrangement of oxygen lance is C, the stirring effect of oxygen lance on the middle and lower parts of molten pool is significantly enhanced, the mixing time is significantly reduced, and the proportion of dead zone and weak flow zone is reduced, which is 3.8% and 9% respectively compared with the arrangement of A. In the study of oxygen lance injection intensity, it is found that the mixing time of molten pool decreases gradually with the increase of injection intensity, but the reduction range decreases. When the oxygen lance injection intensity is 0.31 m3/(t·min), the turbulent kinetic energy of the fluid in the molten pool is the largest. The average velocity of the cross section at 100 and 400 mm below the steel liquid level in the molten pool increases by 42.9% and 31.4% respectively, accelerating the energy transfer in the smelting process.
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Received: 14 July 2021
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2022, Vol. 57 
