Study On Polysilicon Reduction Furnace’s Flow Field And Temperature Field Through Numerical Simulation And Energy Analysis

At present the fossil energy exhaustion is a serious subject to human beings. Solarphotovoltaic power generation has become one of the most important way to alternativefossil fuel power generation. But the raw material costs and the energy consumption ofphotovoltaic industry is high. The polycrystalline silicon is the main raw material of solarpanels,its production cost is the largest in the solar power industry chain proportion. If thesolar energy industry want to continue to develop, reduce polysilicon production energyconsumption is indispensable.The improvement Siemens process is the main process of polysilicon production. Thepolysilicon reduction furnace cost the main energy of the improvement Siemens process.This paper calculated the ratio between theory energy consumption and actual energyconsumption and find that the theory consumption only account for3.5%of the actualenergy consumption. So a lot of energy can be saving, but there has no theory point outhow to save the energy till now. This paper use computer to simulation the reductionfurnace’s flow field and temperature field, try to find out the discipline of the energy cost.Get results as follows:1) The increase of the path is inversely proportional to the energy consumption, thereason is the path get lager the number of the silicon rod get more, and the chemicalreaction area also get more.2) Spiral nozzle can obviously improve the flow field and the temperature field,ensure the airflow velocity and the temperature near the silicon rod. It can improve thereduction furnace reaction efficiency.3) When increase the response gas the furnace in the flow field and temperature fieldwould distribution more uniform, the flow speed near the silicon rod will increase anddistributed uniform along the silicon rod direction then and improve product quality.4) The change of Nozzle format and increase gas flow almost no influence ofpressure field.5) Silicon rod diameter increase will also increase the chemical reaction area improvethe reduction furnace reaction efficiency, reduce the furnace reaction energy consumption.