Industrial Practice and Cfd Investigation of Multi-Chamber Fluidized Bed Reactor for the Mno2 Ore Reduction

The multi-chamber fluidized bed reactor (MCFBR) is beneficial to the higher solid conversion rate, but the complex configuration needs special methodology for the rational design and smooth operation that has not been established until now. In this study, the actual dynamic plant data of industrial MCFBR for the reduction of MnO 2 ore are obtained and analyzed, which indicates that the recovery rate of Mn is confirmed to be kept above 93% normally. Furthermore, the fluidized hydrodynamics and reaction characteristics are investigated by 3D computational fluid dynamics (CFD), which is coupled with the structure-based transfer models for quantifying the effect of mesoscale structure on the hydrodynamics and mass transfer, and multi-chamber calculation method. Simulation results show that the model is able to predict the gas-solid reaction behavior within MCFBR more accurately than the traditional homogeneous model without consideration of mesoscale structure. The effects of partition configuration, fluidized structure and operating condition on the solid conversion rate are then acquired quantitatively and analyzed deeply. Present findings can be applied to optimize the continuous multi-stage FBR rationally and economically