700 t/d浮法玻璃熔窑中玻璃液流动特性与澄清过程研究

Study on flow characteristics and clarification process of glass melt in 700 t/d float glass furnace

从新的视角研究了浮法玻璃熔窑中玻璃液的流动与澄清。利用Ansys CFD软件,对浮法玻璃熔窑内玻璃液流场进行了模拟计算,分析了池窑内玻璃液温度分布和流动特性,在此基础上进一步分析了玻璃液气泡的澄清过程。结果表明,沿窑长方向,玻璃液表面与池底温度分别呈现两个山形分布,玻璃液在池窑内形成三个大范围环流,澄清部前进流和回流速度均先增大后减小。池深方向由液面到池底,玻璃液温度呈梯状递减,在离液面约400 mm深度处液流前进速度为0,热点以后此面以上液流向卡脖平稳流动,到达卡脖处的最短时间为418 s,在此时间内,直径大于1.2 mm的气泡在随液流到达卡脖前可排出,直径小于1.2 mm的气泡能否排出还需进一步研究气泡的上浮和变化规律。

It is well known that the flow and clarification process of glass melt are critical to glass production control and product quality.To explore the flow characteristics and clarification process of glass melt in float glass furnace,the flow field and temperature distribution were studied.From a new perspective the numerical simulation of the flow and heat transfer process of glass melt were carried out for a glass tank under actual working conditions by using Ansys CFD software.In view of the simulation results on flow field and heat transfer of glass melt in float glass furnace,the temperature distribution and flow characteristics of glass melt in the furnace were analyzed and the clarification process of the bubbles in glass melt was further analyzed on this basis.It was found that along the furnace length,the temperature of the glass melt on the surface and at the bottom of the tank showed two mountain shaped distributions respectively,and the flow pattern of glass melt presented three large circulation flows in the tank.In the clarification section the forward and backward flow velocities of glass melt increased and then decreased.In the direction of tank depth from surface to bottom,the temperature of glass melt decreased in a gradient.At a depth of about 400 mm from the surface,the value of flow velocity was zero.After the hot spot,the flow above this surface flowed smoothly to the neck,and at the shortest time of 418 s.Within this time,bubbles larger than 1.2 mm in diameter can be eliminated before they reached the neck with the flow of glass melt,and whether the bubbles smaller than 1.2 mm in diameter can be eliminated or not needs further study on the pattern of bubble uplifting and changing.