Using The Fluent Sotfware To Simulate The Three-phase Flow Regime Of Aerated Biologic Lfuidized-bed

The good hydraulic conditions of fluidized-bed that keep itself run stably andbeen widely used in various sewage treatment plant. In order to improve the operationeffect, people try to probe its defect that leave the research become the hotspots.There many factors affect its function, but the force between interphase that straightlyinfluenced the stable operation of the fluidized-bed. Shear-force of water-vapor andparticle collisions can sustain the growth of microorganisms in a perfect state, somoisture conditions and particle collisions are the key factors that determine itsoperation. Because currenlty the interactions between different phases are still notwell understood, so we primarily rely on experience to design the fluidiezed-bed, andto predict how the spatial-structure arrangements of fluidized-bed to affect itshydrodynamics is still very difficult. Nowadays though simulate by fluent-software tostudy the fluidized-bed just in its infancy.what we do now are the pioneering research.The academic study of particle currently focuses on individual particle that don’t meetthe demand of real suitation. Instead of discrible individual particle, granular-parameter in fluent-software can effectly describe the groups feature of particles.wechoose fluent-software to simulate the fluidized-particles that are truly appropriate.Asa dedicated computational fluid dynamics software, fluent-software provides ananalysis-plat that can simulate and analysis the hydrodynamic features of a uniquestructure.The interaction between the particle density and moisture lift force determinesthe substance diffusion of fluidized bed.Due to the diffusion law of particles influidized-bed does not obey Fick’s law, but mainly on forced diffusion, so the particledensity close to1, the efficiency of particle diffusion and wastewater treatment willimprvoed. Although the three-phase flow simulation of fluidized bed in athree-dimensional circumstance is very complex, but by simplify the three-phases totwo-phases, we can complete the simulation very fluently.According to Ivan’sexperiment result,when air flow is2500L/h,that particles reach the initialsuspension state. By the result of fluent simulation, we deduced that when air flow is2000~3000L/h, particles may reach the initial suspension state. Thefluent-simulation is consistent with experimental.There narrow distance between theresults of simulation and experimental, which illustrate that is workable by fluent-software to simulate the three-phase flow state.Simulation results show that ABFB1model exist serious particle accumulationzone. ABFB2model simulation results show that the Angle of shape can eliminate theaccumulation of particles on the bottom of the block, and that inner barrel of fluidizedbed are collected force of suspension lift. ABFB3model simulation results show thatthe three-phase separator could guide the gas separation. By three-phase flowsimulation of fluidized bed unit, can increase the understanding of the fluidized bed,and can be used to guide the optimization of fluidized bed device.