Numerical Simulation And Water Model Experiment Of KR Hot Metal Desulfurization

Large in iron and steel production and consumption in China as of November 2017,China’s steel outputs more than 972.98 million tons.Although steel production in China is huge,but many special steel still was dependent on import,such as broadband,cold rolling thin coating plate（tape）,electrical steel（tape）,and some of the stainless steel plate,galvanized sheet（tape）,and so on.Therefore,China still needs to strengthen research on improving the quality of steel.Sulfur has a serious effect on steel quality,reducing the content of sulfur in steel has great significance.The Fluent computational fluid dynamics software is adopted to research the influence of hot metal ladle structure on hot metal internal flow field based on KR mechanical stir method desulfurization.The results show that the spherical ladle effectively reduce the"dead zones"volume of hot metal,and it can shorten the mixing time.It can be found that hot metal form the obvious irregular flow in the bottom of spherical ladle through comparing internal flow field of hot metal.The irregular flow make for decentralize of desulfurizer.At the bottom of the hot metal ladle molten iron from one side to another side,showing eccentric mixing good reduce the volume of"dead zone"of flow at the bottom.When the stirring rate increased from 120 rpm to200 rpm,hot metal flow velocity increases about 68%.Base on KR method hot metal desulfurization the flow condition and the vortex was studied when the stir method is eccentre.The results showed that formed irregular vortex when stirred eccentric.In the stirrer is close side wall was fully mixing,and the hot metal flow velocity for about 1 times larger more distal.The water model experiment was used to study the KR method desulfurization process of vortex,and the results compared with the results of numerical simulation.The results showed that the results of numerical simulation is agree with the results of water model experiment,and found that the gas was involved into the hot metal when the stirrer immerse too shallow.When stirrer immersed depth of 187.5 mm,axial average velocity differenceΔv is maximum,the largest velocity difference is 0.132 m·s^-1,the large axial velocity difference is conducive to the involvement of the desulfurizer.