Effect Of Electromagnetic Braking On The Flow Of Thin Slab Crystallizer Steel Under High Drawing Speed Conditions

High-efficiency continuous casting technology is the core of modern steel technology development and the key to achieve high efficiency of steel production process.The research on the electromagnetic braking mechanism is still scarce,and the theoretical support and industrial development are urgently needed.In order to deeply study the influence of electromagnetic braking on molten steel flow in thin slab continuous casting mould,a three-dimensional mathematical model of molten steel flow in thin slab funnelshaped mould was established in this paper.Through physical hydraulics tests,the accuracy of numerical simulation was verified,and the influence of mixed oil with different viscosities and upper surface velocity of mould on the interface slag coiling of thin slab continuous casting was further explored.By comparison,it is found that when the casting speed is 4 m/min and the immersion depth is 190 mm,and the flow rate of the steel slag interface of the crystallizer remains below 0.25 m/s,the probability of slag rolling is low and the disturbance to the liquid level is small.Using COMSOL finite element method to analyze the effect of different coil arrangements,different core distances,additional coil turns,and other media on the distribution of magnetic induction intensity in the crystallizer.The results show that the "U" type magnetic field avoids the water outlet flow position,but covers the steel flow area after the outlet flow.The magnetic induction intensity in the simulated crystallizer meets the measured value in the field when the core to crystallizer fluid field is 190 mm and the number of coil turns is 120 turns.The magnetic fluid coupling interface in COMSOL is used to write the electromagnetic force equation with induced current and magnetic induction intensity to introduce the flow field by force.The results show that the "V" type braking effect is weak and has a greater impact on the temperature field in the crystallizer;The "W" type combined magnetic field has a significant braking effect on the steel,and the flow rate on the upper surface of the crystallizer is controlled at 0.2?0.35 m/s.The "U" type,while controlling the flow velocity on the upper surface of the crystallizer less than 0.3 m/s,takes into account the smooth flow of the return flow under balance and the symmetry of the crystallizer flow field and the small area occupied by the braking device;The "H" type has the strongest braking capacity and the best stability,but the "H" type has the strongest braking ability and the best stability,but the regulation of the crystallizer area is weak.Figure 51;Table 6;Reference 76...