全氧燃烧高铝玻璃熔窑三维数值工程仿真

Three-dimensional numerical engineering simulation of oxy-fuel high alumina glass furnace

基于Ansys Fluent 19.2软件采用玻璃液面与火焰空间底部双向热耦合方式进行三维联合建模,对日拉引量为100 t/d的全氧燃烧浮法高铝玻璃熔窑的玻璃池窑与火焰空间进行数值工程仿真,考察入口预设配合料堆长度对耦合区温度连续性的影响,提出基于3D流场的澄清因子计算公式.结果表明:在8次热耦合迭代后,温度和热流残差趋于稳定,玻璃液与火焰空间进行热交换部分的热流分布与火焰空间底面温度分布相对应,火焰空间温度场在玻璃液产生了不对称的横向对流;预设6.6 m料堆长度的温度曲线具有最好的连续性,该试探性计算提供了判断玻璃配合料山长度的新方法;计算得到热耦合与非热耦合的澄清因子分别为4.642 5、4.827 9,表明常规非热耦合计算高估了池窑的澄清能力.

Ansys Fluent 19.2 was used to study the melting tank and the combustion space of oxy-fuel high alumina float glass furnace with daily output of 100 t/d.The bidirectional thermal coupling between the top of the glass flow and the bottom of the combustion space for 3D modeling were employed.The influence of inlet batch length on temperature continuity in the coupling zone was investigated,and a formula for calculating refining index based on 3D flow field was proposed.Results show that after eight iterations of thermal coupling,residuals of temperature and heat flux tended to be stable,heat flux distribution of the heat exchanging zone between glass flow and combustion space corresponded to the temperature distribution at the bottom of combustion space.The temperature field of combustion space produced asymmetric transverse convection in glass flow.The temperature curve of the preset 6.6 m batch length showed the best continuity,and this kind of exploratory calculation provides a new method for judging the length of glass batch.The refining index of thermal coupling and non-thermal coupling were 4.6425 and 4.8279,indicating that conventional non-thermal coupling calculation has overestimated the refining ability of melting tank.