新型还原炉流场温度场的模拟研究

The Simulation of Flow and Heat Transfer in a New Polycrystalline Silicon Reduction Furnace

为适应太阳能产业的发展需求,提出了一种结构新型的多晶硅还原炉,新型还原炉在传统西门子还原炉的基础上进行了多处的改进:1)增设了外壁面高度刨光的热管;2)在炉膛内部中央出气口处增设了套筒;3)增加了3个内插进气口。并采用计算流体力学方法研究了该型还原炉内的速度场和温度场。速度场模拟结果发现增设的套筒结构起到了收集还原炉顶部气体的作用使气体更好的通过底盘的中央出气口散出;温度场模拟结果发现内插进气口促进了还原炉顶部气体的及时更新,高度刨光的热管表面成功反射硅棒所辐射的热量,降低了还原炉环境温度,有效的防止了粉末硅的生成更加,更加有利于硅棒的生长。

In order to meet the demand for the development of the solar industry,this paper proposed a new type of polycrystalline silicon reduction furnace. The new reduction maked several improvements on the basis of the traditional Siemens reduction furnace: 1) Add heat pipes with highly polished outside faces; 2) Add a sleeve inside the furnace at the central outlet; 3) Add three interpolation inlets. The velocity and temperature fields were simulated by using computational fluid dynamic method. The simulation result of the flow field showed that the sleeve structure played an important role in collecting reductive gas making it easier to come through the central outlet; the result of the temperature simulation showed that the interpolation inlet promoted the update of the reductive gas at the top of the furnace; the highly polished surfaces of the thermotube reflected heat radiation by silicon rod,reduced the environment temperature of the reduction furnace,prevented the production of silicon powder successfully and was more conducive to the growth of silicon rods.