Simulation Study On The Influence Law And Inhibition Of Vortex In The Pouring Process Of 70 Tons Ladle

With the rapid development of steel making technology,people have higher and higher requirements on the cleanliness of continuous casting molten steel and the quality of casting blank.Ladle is an important link in the process of continuous casting.The optimization of slag retaining technology has an important Influence on the quality of steel.Therefore,it is necessary to improve the metal yield and prevent the phenomenon of swirl slag rolling in the production of clean steel.According to the equipment condition and process parameters of 70t ladle in a steel plant,the influence law and evolution behavior of vortex in ladle casting process were studied by water model experiment and numerical simulation.Four groove anti-vortex pad and negative pressure are designed to restrain the influence of ladle pouring vortex.?1?The influence of initial liquid level height,stirring energy,nozzle diameter and eccentricity on the vortex formation height and critical height was studied by water model experiment.The critical height of the vortex and the diameter of the nozzle are:H=1.83333×10^-4D⁴-0.02733D³+1.32167D²-18.56667D+96.When the diameter of the ladle is increased from 20 mm?prototype 80 mm?to 60 mm?prototype 240 mm?,the formation height and critical height of the vortex are increased by 92%and 231%,respectively.When the four-groove anti-wirl pad is 2.5D?prototype 10D?,the critical height is reduced by up to 71.8%.The critical height and eccentricity of the vortex meet:H=-36.61089e^?-x/-2.2945?+95.42308.When the ladle eccentricity is increased from 0?prototype 0?to 0.95?prototype 0.95?,the formation height and critical height of the vortex are reduced by 34.7%and 31.6%,respectively.When the vacuum degree in the ladle is controlled at 99.32KPa?prototype 50KPa?,the vortex effect is best,and the critical height of the vortex is reduced by 77.7%compared with the non-negative pressure casting.The critical height of the vortex and the height of the four-groove anti-whirlpool pad are satisfied:H=-1.97531×10^-4h³+0.04063h²-2.87937h+1926..?2?The effects of initial tangential velocity,nozzle diameter and eccentricity on the critical height of the vortex were studied by numerical simulation.The influence of the variation of the groove height on the vortex is mainly studied.The maximum tangential velocity and nozzle diameter when the vortex reaches the critical height is:v=0.08323D^-.06761.