Numerical simulation of flow and heat transfer in a continuous casting round bloom with eccentric M-EMS
NIU Liang1,2, ZHAO Jun-xue1, QIU Sheng-tao2, TANG Wen-dan1, YANG Ling-zhi3
1. School of Metallurgical Engineering, Xi′an University of Architecture and Technology, Xi′an 710055,Shaanxi, China; 2. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China; 3. School of Minerals Processing and Bioengineering,Central South University, Changsha 410083, Hunan, China
Abstract:In order to explore the effect of eccentric mold electromagnetic stirring (M-EMS) on the flow and heat transfer of molten steel in continuous casting round bloom and reduce the adverse effect of eccentric M-EMS on round bloom, a coupled three-dimensional mathematic model is established to study the flow and heat transfer characteristics of molten steel in Φ380 mm round bloom with eccentric M-EMS and the effects of M-EMS parameters. The results show that under the action of eccentric M-EMS(300 A/2 Hz): the molten steel entering the mold from the nozzle flows to the external arc side, and a large recirculation zone will be formed after molten steel hitting the arc side; the temperature of molten steel near the external arc side is higher than that near the inner arc side; as the distance from the meniscus increases, the temperature of the molten steel on the external arc side increases first and then decreases, the temperature at the center of the M-EMS is the highest at 1 779 K; the temperature of the molten steel on the inner arc side has been decreasing. As the current intensity increases from 100 A to 500 A, the recirculation zone under the round bloom changes from one to two; the temperature difference of the molten steel on the inner and external arc sides first decreases and then increases, which is the smallest at 300 A, and the temperature difference is 8.4 K. As the current frequency increases from 1 Hz to 5 Hz: the recirculation zone near the external arc side becomes smaller until it disappears. When the current frequency is less than 3 Hz, the temperature difference of the molten steel on the inner and external arc sides is less than 10 K, and when the frequency is greater than 3 Hz, the temperature difference is greater than 16 K. The recommended M-EMS parameter for Φ380 mm round bloom is 300 A/2 Hz.
牛亮, 赵俊学, 仇圣桃, 唐雯聃, 杨凌志. 偏心M-EMS作用下连铸圆坯流动-传热模拟[J]. 钢铁, 2020, 55(9): 49-56.
NIU Liang, ZHAO Jun-xue, QIU Sheng-tao, TANG Wen-dan, YANG Ling-zhi. Numerical simulation of flow and heat transfer in a continuous casting round bloom with eccentric M-EMS[J]. Iron and Steel, 2020, 55(9): 49-56.
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