Numerical simulation on optimization of distributor structure of fluidized bed flotation cell
Fluidized bed flotation exhibits substantial potential for application in the field of coarse particle separation.The effect of the multi-ring bridge-connected fluid distributor's design parameters on the fluid dynamics of fluidized bed flotation equipment via solid-liquid two-phase flow simulation was investigated.The simulation results reveal that,at inlet superficial water velocity of 3 m/s,the water jet velocity from the fluid distributor is primarily distributed between 0.4 and 1.2 m/s,with local velocities reaching 0 m/s and 1.8 m/s.The solid phase volume fraction in the fluidized bed is between 26％ and 32％.In the central area,the particles move upwards at speed of 0.11 to 0.21 m/s,while in the near-wall area,the particles are in a stationary/descending state,with speeds below 0.07 m/s.By adjusting the number of openings,the aperture ratio of the fluid distributor is modified.The simulation results indicate that increasing the aperture ratio of the fluid distributor leads to a relatively increased water ejection from the inner ring,thereby decreasing the non-uniformity of the distributor's water distribution.However,by reducing the inner/outer ring hole diameter ratio and increasing the unevenness of the opening,the water output from the inner ring can be suppressed,enhancing the uniformity of water jet velocity distribution.At the same time,this also reduces the turbulent intensity within the bed layer and the probability of detachment of coarse particles.The research findings provide a basis for the design of fluid distributors in fluidized bed flotation columns.
flotationcoarse flotationfluid simulationfluidized bed flotation colunmfluid distributor
万方数据
维普
