Numerical Simulation And Optimization Of Flow And Heat Transfer In Polysilicon Reduction Furnace

With the rapid development of photovoltaic industry in recent years,the improved Siemens method as the main method of producing silicon is widely attention,how to improve the productivity of their products,optimization of equipment become the research focus in recent years.In this paper,the flow field,temperature field and energy dissipation of a polysilicon reduction furnace(CVD reactor)are studied.The polysilicon reduction furnace(CVD)is a high temperature airtight reaction vessel,and it is difficult to accurately monitor the internal working conditions.In recent years,computer technology has been developing continuously and computational fluid dynamics(CFD)has been widely used for its theoretical and practical applications.In this paper,computational fluid dynamics(CFD)was used as software platform in ANSYS FLUENT15.0 to simulate the working conditions of the reduction furnace.In this paper,the component transport model is adopted.Considering that the DO radiation model is selected in the heat transfer simulation calculation in the furnace,the mass velocity coupling calculation is calculated using SIMPLE algorithm.Simulation results show that: based on the traditional reduction furnace flow field and temperature field analysis,the traditional reduction furnace is more cyclone and flow dead zone,furnace temperature is uneven phenomenon,this phenomenon will cause great or "popcorn" silicon rods,affect the product quality to reduce productivity.By changing the diameter of the silicon rod,as the diameter of the silicon rod increases,the flow field and temperature field in the reduction furnace become more uniform,so the increase of the diameter of the silicon rod is beneficial to the occurrence of the vapor deposition reaction.In this paper,on the basis of traditional reduction furnace to make the improvement on the structure,calculated by numerical simulation,the improved reduction furnace flow field become more uniform,an after comparing with the traditional reduction furnace energy dissipation,found that the improved reduction furnace internal friction can be significantly reduced.This paper presents a feasible improvement plan for the traditional reduction furnace.