Numerical Simulation on Concentration Distribution of Particles in the Feeding Pipe of a Superfine Classifier

RNG k-e turbulent model and the stochastic track model were respectively adopted to simulate the particle concentration distribution characteristics in the feeding pipe of a superfine classifier SCX.The effects of inlet solid concentration,inlet velocity and particle diameter on the concentration distribution of particles were analyzed.The results show that the distribution fluctuates significantly near the bending outlet,but it becomes more stable from the bending outlet of 6 times pipe diameter.The particle concentration in the vertical section can be divided into high and low concentration areas.The dimensionless radius (r/R) of two areas is in a certain range.In the X direction,the low concentration range is-1r/R0.75,and the high one 0.75r/R1.In the Y direction,the low concentration range is-0.75r/R0.75,and the high one-1r/R-0.75 and 0.75r/R1.Meanwhile,the size of two areas is basically unchanged with the change of the inlet solid concentration,inlet air velocity and axial height.In the vertical section,the local particle concentration decreases with the increase of the inlet velocity,and the particle concentration near the wall decreases much more obviously.The change of the inlet solid concentration has less influence on the dimensionless concentration distribution of particles.