KR法脱硫气液两相流的数值模拟与水模型试验

Numerical simulation and water model experiment of gas-liquid two-phase flow in KR desulphurization

采用CFD软件Fluent中标准k-湍流模型和VOF多相流模型对KR法铁水脱硫过程中气液两相流进行了模拟,研究了搅拌器浸入深度与搅拌速度对漩涡和液相流场的影响,数值模拟结果与水模型试验结果基本吻合。研究结果表明：随着搅拌速度增加漩涡深度逐渐加大,搅拌器浸入过浅容易发生＂卷气＂现象;搅拌速度由120r/min增大到200r/min时,铁水平均速度增大约83%,铁水内部形成不规则流动,且轴向流动明显增强;搅拌器浸入深度为187.5mm时,轴向上铁水平均速度差最大,为0.132m/s,大速度差有利于脱硫剂的卷入;搅拌速度为160r/min时,高流速铁水所占体积比大。

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 120 r/min to 200 r/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 187.5 mm,the difference in the average axial velocity of the molten iron is 0.132 m/s.The large speed difference is beneficial to the entrapment of the desulfurizer.When the stirring speed is 160 r/min,volume ratio of the high-flow molten iron is large.