| In this study, a hydrodynamic model for multiphase flows, based on the principles of mass conservation, momentum balance and energy conservation for each phase, was developed and applied to model gas-liquid, gas-liquid-solid fluidization and gas-solid-solid separation. To simulate the industrial slurry bubble column reactors, a computer program based on the hydrodynamic model was written with modules for chemical reactions, phase changes and heat exchangers. Also the kinetic theory was programmed to compute the viscosity of the solid phase.;The slurry bubble column reactor, a typical multiphase flow system, is used to produce methanol from syn-gas (CO, H;The model was also applied to understand the hydrodynamics of electrostatic separation of pyrites from coal. The model was modified to include an external electric force. The kinetic theory has been applied to predict the viscosities for both solid phases, coal and pyrites. The study showed that pyrites can be removed from coal in an inclined electro-fluidized bed. A series of pictures from simulations show the hydrodynamic behavior, such as solid flow patterns and pyrites concentrations, in the electrostatic separator. This study indicates that dilute feeding results a high coal recovery and leads to an improved design of electrostatic separators. |
