The influence of extended single- and multi-jet nozzles in a fluidized bed reactor on growth of granular polysilicon was studied, experimentally and numerically. Three-dimensional (3D) unsteady computational fluid dynamics (CFD) calculations were performed using the Fluent commercial CFD package. The Eulerian-Eulerian multiphase model was applied for the bulk motion of the two-phase flow, and the kinetic theory of granular flow was used to predict the solid-phase interactions. 3D cold-model reactor experiments were performed to validate the models and conditions used for the CFD simulations. The CFD-predicted pressure drop and bed expansion agreed reasonably well with the cold-model reactor test data. For a single-jet nozzle, superimposed bubbling and spouting behavior were observed in the bed. The effects of the single-jet intensity were also examined. For multi-jet nozzles, the mixing performance was much improved in the reaction zone and the dead reaction zone was reduced compared to the single-jet nozzle. Furthermore, determining the optimal configuration of multi-jets nozzles is necessary to minimize or avoid wall deposition as well as enlarging reaction zone.
Bibliographical noteFunding Information:
This work was supported by the Development of the polysilicon manufacturing equipment for solar cell of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted funded by the Korea Government Ministry of Knowledge Economy (No. 2008-N-PV12-J-05 ). This work was also supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011-0017673 ).
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering