Numerical simulation and water model experiment of gas- liquid two- phase flow in KR desulphurization
ZHANG Song- lai1,2,YU Qing- chun1,2,YANG Bin1,2
1.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China 2.National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
Abstract��The gas- liquid two- phase flow in the KR method of hot metal desulfurization was simulated by the standard k- �� turbulence model and the VOF multiphase flow model in the CFD software Fluent. The immersion depth and stirring speed of the agitator were studied for the vortex and liquid phase flow fields. The numerical simulation results are basically consistent with the water model test results. The results show that the vortex depth increases with the increasing of stirring speed, and the immersion of the stirrer is too shallow to cause ��cuffing�� phenomenon. When the stirring speed is increased from 120r/min to 200r/min, the average speed of molten iron increases by about 83%, the irregular flow inside the molten iron forms, and the axial flow is obviously enhanced. When the immersion depth of the stirrer is 187. 5mm, the difference in the average axial velocity of the molten iron is 0. 132m/s. The large speed difference is beneficial to the entrapment of the desulfurizer. When the stirring speed is 160r/min, volume ratio of the high- flow molten iron is large.
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