CFD Simulation Of Mixing Process In Cerium Oxalate Stirred Tanks And Structural Optimization

Crystalline products, which is not new for us, for the basic needs of people nowplays a very important role. This will cause us to study mixing equipment. This paperexplored a series of mixing equipment. We studied the stirred tank flow conditions,hybrid solid-liquid suspension problems and conditions and check impeller and shaft,etc. this provides a strong basis for industrial mixing equipment in the selection, designand optimization. Study of mixing equipment, fluid simulation using Fluent software,made the following main elements:(1) On the flow field in stirred tank and mixing was simulated, the simulation andexperimental data obtained and the results are very consistent with the literature, whichverifies the correctness of CFD simulations. On the presence or absence of the baffle and thenumber of blades were stirred tank fluid dynamics analysis, we compared the effects of theirflow field. The complex surfaces have been optimized propeller blades and parametricmodeling for rapid modeling provides guidance. And comparing the effects of severalcommon paddle on the flow field in stirred tank and mixed effects.(2) We are highly optimized for the disc turbine impeller, the main point of impactdetected by the installation height and installation angle of the stirring blades and otherfactors effect produced mixing tank. And flow with mounting angles and mounting heightwere generated to explore, which selects the best installation height under optimalinstallation angle. Mixing tank for structural optimization flat bottom, we selected thebottom end of the ellipse, toric bottom and cone bottom. And selected the most beneficialeffect mixing of bottom structure. On this basis, we simulated the mixing effect which theblade size and location of the feed is generated,and then worked on a reasonable choice ofblade sizes to optimize the design and location of the feed.(3) Completely from the bottom on the critical speed is calculated in solid-liquidsuspension, the results obtained by comparison with literature values, the error is within10%, indicating that the predicted meet industrial requirements; On this basis, we are pre-optimized stirred tank was calculated entirely from the bottom of the critical speed.High concentrations of particles in stirred tank was simulated in the process of parkingand restart, in the re-start the process of gradually accelerated, so that the motoroverload can be avoided.(4) On the basis of pre-fluid dynamics, we have carried out important parts ofstirred tank fluid-structure interaction, the force to check the structure and conditions ofspeed. Equivalent stress and deformation of the material of stirring and mixing paddleand shaft can be used to meet the requirements. Whether paddle or system, its naturalfrequency is much higher than under normal operating frequency, resonance mixingequipment will not occur.