浮法锡槽入口段玻璃液流动过程模拟分析

Simulation Analysis of Glass Melt Flow Behavior in Entrance Area of Float Tin Bath

针对浮法玻璃成形过程,提出了锡槽入口段简化稳态多相模型,并采用Ansys Fluent 2019 R3软件,模拟研究了500 t/d锡槽入口段玻璃液的流动与成形过程,分析了拉引量、玻璃液黏度对唇砖与八字砖区玻璃液流动与液层厚度分布的影响。结果表明,拉引量过小或黏度过低时液层出现不连续,拉引量过大或黏度过高时液层横向厚度均匀性变差,案例锡槽实现浮法玻璃均匀稳定成形的工艺操作范围是拉引量400~550 t/d,黏度400~600 Pa·s。

For the float glass process, a simplified steady multiphase model was proposed for the simulation of glass melt forming process in the tin bath entrance area. The Ansys Fluent 2019 R3 software package was employed to simulate the glass melt flow and forming process for a tin bath with pull rate of 500 t/d. The flow behavior and layer thickness distribution of glass melt at spout lip and restrictor area were investigated with different pull rates and viscosities. According to the results, the glass melt layer becomes discontinuous with small pull rate or viscosity, and the uniformity of layer thickness in transverse direction gets worse with extreme large pull rate or viscosity. Finally, the optimized operation condition for float glass forming process of the sample tin bath is pull rate of 400~550 t/d and viscosity of 400~600 Pa·s.