| With the industrial production of silicon refining the development of new technology, a variety of metallurgical silicon process fluid flow phenomena requires further study. But the high temperature environment of the metallurgical industry makes a direct measurement of the presence of great difficulties in obtaining sufficiently reliable information and data on the flow field, CFD (Computational Fluid Dynamics, CFD) technology for in-depth study of the metallurgical process fluid flow and provides a new phenomenon methods and possibilities.The thesis focused on an industrial silicon production enterprises in Yunnan Province, outside a 16500 kw submerged arc furnace refining silicon ladle for the study of outer ladle silicon refining process complex gas-liquid flow behavior research, mainly in CFD simulation and water model experiment carried out the following work:first application VOF (Volume-of-Fluid) multiphase flow model, considering the effect of two-phase surface tension and wall function, the use of RNG k-ε two-equation models and Geo-reconstruct geometry reconstruction method to achieve the two-phase unsteady flow interface, a single bubble motion in the water three-dimensional simulation of gas bubbles rising in the process of growing up, floating and rupture behavior, freedom fluctuations in the surface of the study results show that the mathematical model has a certain rationality. Outer establish equal proportions of refining silicon ladle mathematical model, calculation model and calculation methods used by the above silicon used water was stirred, three-dimensional numerical simulation of transient. Different section within the main parameters of Silicon bubble bag, gas volume fraction distribution within the silicone-coated liquid flow and free surface fluctuations, structural optimization and exterior design and industrial silicon refining process optimization silicon ladle provides the basic data and basis.Based on similar principles, in accordance with the 1:3 ratio of a similar design silicone-coated water model experimental device, organic glass to replace the refractory ladle to simulate fluid silicon prototype of the above simulation results and experimental validation of the silicone-coated preliminary Optimum Design. The use of observation and photographic method to obtain the formation of the bubble, the movement of its distribution, and use of light sheet Get further information flow field inside the pool. The main research liquid level, blowing flux, the import position distribution on mixing time, the analysis optimum optimization in the bottom-blowing experiment is:At the bottom of the intake holes 11 are distributed to the intake program, the bottom blow flow 1.2 Nm3 · h-1, liquid height 414 mm, the blending effect of silicone-coated model is the best to provide guidance for the actual production or further research reference. The optimized 11-hole intake programs can improve the flow field within the model, reduce the proportional flow inside the dead zone, and make a more uniform distribution of air bubbles in the silicon ladle. |
