Numerical simulation of multiphase flow in bottom-blowing furnace for lead smelting
(School of Metallurgy Science and Engineering, Central South University, Changsha 410083, China)
Abstract: Based on the material properties of furnace slag phase and metal phase, a mathematical model for the actual system of bottom-blowing lead smelting furnace was built by computational fluid dynamics software FLUENT. Three-phase VOF model and standard k-ε turbulence model were applied to simulate the gas-slag-metal phase flow process in the furnace. Phase interface structure, velocity distribution and streamline distribution were obtained by this model. Strong stirring and vortex slag layer were found in the upper area of the tuyere which benefits chemical reactions. The proposed model that simulates the multi-phase flow in the furnace is significant for furnace structure and operating conditions optimization. The analysis of flow patterns under different conditions can effectively guide the improvement of bottom blowing furnace working conditions. In the optimization of inlet velocity and lance inclination angle, it is found that increasing inlet velocity can improve the melting efficiency, and the best lance inclination range is from 5° to 7°.
Key words: bottom blowing furnace; multiphase flow; FLUENT; structure optimization