Design and Numerical Optimization of Gas Guidance System in Casting Silicon Furnace by the Orthogonal Experiment

Abstract 3D global simulations were performed to investigate the gas flow and impurities transport in casting silicon furnace under the influence of a unique designed spray-type gas guidance system (GGS). The simulation results show that, the intensity of backflow at crucible outlet had no obvious change with the application of this GGS, but the flow area of backflow was effectively inhibited above the melt free surface and the kinetic rate of reaction was weakened at the cover. Finally, the area-average concentration of CO at the melt free surface was decreased by 31%. The GGS was optimized by the orthogonal experiment, including the argon flow rate (Q), length of deflector (L) and distance between GGS and melt free surface (H). When Q = 40 L/min, H = 50 mm and L = 50 mm, the GGS had the most obvious effect on removing impurities.