建立了底吹钢包内气/钢液/渣三相流动数学模型, 利用多相流动体积法(VOF)模拟了渣层运 动行为. 模型结果再现了底吹钢包内气/钢液/渣三相流动现象. 当Ar气被吹进钢包时, 在 钢液内产生气泡, 上升的气泡间 歇地冲击并突破渣层, 产生渣眼; 同时, 渣层发生波动, 波动频率随着Ar气流量的增加而增加. 参数研究显示: 220 t钢包底吹流量由100增加到 300 L/min, 渣眼直径由0.43增加到 0.81 m. 计算的无量纲渣眼面积与文献中渣眼的实 验结果很接近. Ar气喷吹期间, 渣层发生重大的变形, 近渣眼处的渣层变薄, 近钢包壁 处的渣层变厚. 渣眼周围钢液流速很大, 并导致部分渣滴卷入钢液中.
A Mathematical model has been developed to analyze the transient three- dimensional and three–phase flow in an argon gas bottom stirring ladle with one porous plugs. Multiphase Volume of Fluid (VOF) method is used to simulate the slag layer behaviors. Numerical results produce the following transient phenomena: when argon gas is injected into molten steel in a ladle, gas rising passage is formed near the plug, and then bubbles are created in the interior of molten steel; the rising gas bubbles impinge the slag intermittently and breakthrough the slag layer to create the slag eye. Simultaneity, the wave at interface of slag-steel formed and wave frequency increases with the increasing of argon gas flow rate for one off-centered plug case. Parametric studies show that diameter of slag eye changes from 0.43 m to 0.81 m while the argon gas flow rate vary with 100 ~300 Nl/min for a 220 ton ladle. The non-dimensional areas of slag eye vs the modified Froude number is close to experimental data in literature. Significant deformation of slag layer occurs during gas stirring operation, the thickness of slag becomes thin near the slag eye and thick near the ladle wall accordingly. The steel downward flow velocity at the slag eye periphery can be affected significantly by Ar gas flow rate. The higher the velocity, the more slag emulsification can be expected.
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%