Numerical Simulation And Experimental Research On Flow Field Of A Dryer With Cone And Ribbon

The continuous polysilicon slurry dryer with cone and ribbon,can undertake evaporation process of slurry in the airtight environment,and extract the polysilicon chlorosilane materials which can return to cold hydrogen equipment.The old intermittent slurry drying machine loads heavy,and pours a large quantity of acid-base neutralization liquid into downstream equipment in a short time,releasing a lot of heat.It really damages equipment’s anti-corrosion lining.Continuous drying machine can avoid the problem.This paper studied the continuous drier’s flow field,material residence time and distribution.It provides a basement for the continuos dryer’s production calculation.（1）Using scaled method to build an experimental model.This article obtained the residence time of material and the tracked particle’s trajectory with the method of simulation and experiment.Introduce a set of particle loading correction method into the simulation process.Compared with the results of experiment,this article verified the scientificityof simulation.（2）On the basis of correct simulation experimental equipment,this article simulated industrial equipment in non-full flow situation.Using the particle loading correction method,At the situation of entrance velocity from 0.05 m?s^-11 to 0.25 m?s^-1,rotating speed from 12 r?min^-11 to 44 r?min^-1,equipment’s fluid volume deposit from 6%to 30%,simulation was undertaken.（3）Industrial device’s simulation showed that the material’s residence time is3235s to 4284s.The residence time will be shorter with the increase of the inlet velocity.Slurry can be elevated by the cone and ribbon,and the faster the rotating speed,the higher the slurry raised.But the higher the speed,the greater the power consumption.When the equipment’s fluid volume deposit is higher,the heat transfer area increased,but the power consumption is greater.（4）With the original intermittent drying experimental data,the continuous equipment was divided into many small pieces to do heat transfer calculation.This article finally got the solid content at the experiment’s exit.The solid content at its exit can reach 76%⁸6%,roughly meeting the production’s requirements.With the increase of rotational speed and inlet velocity,solid content at the exit decreased.Under the following situation of speed under 5 r?min^-1 or inlet velocity under 0.38 m?s^-1,the drying requirement can be totally satisfied.