Hydrodynamic characteristics of central pulse gas-liquid-solid circulating fluidized bed: Effect of gas and solid parameters

As an important multiphase reactor, gas-liquid-solid circulating fluidized bed is widely used in petroleum, chemistry, metallurgy, pharmacy and environment fields. In this work, a gas-liquid-solid circulating fluidized bed with central pulsating liquid flow was proposed and investigated to further improve the reaction rate of the reactor. The Eulerian-Eulerian-Eulerian method coupled with kinetic theory of granular flow is used to simulate the flow characteristics in the fluidized bed riser. At the same time, experiments under some operating conditions are carried out to verify the simulation results. The result shows that the relative motion of solids and liquid phase in the novel reactor is significantly increased compared with the conventional circulating fluidized bed. The continuous variation of the central pulse flow improved the pressure gradient fluctuation and mass transfer intensity. The radial/axial liquid-solid relative velocity regression formulas were obtained based on the numerical calculation results.