For lattice vertical roller mill, the effect of lattice has a greater inhibition on the discharge of large particles, even if the lattice opening is large, it will also prevent the discharge of some large particles.
In order to reduce the residence time of materials in the mill and prevent the occurrence of material blockage, the following methods can be adopted: firstly, the classification function is introduced into the mill model, and the classification return material is directly returned to the inlet of the mill.
Secondly, different axial velocities are used to represent the advance of particles in the mill for different particle sizes, which can be equivalent to returning the graded sand back to the inlet of each mixer, so as to reduce the residence time of materials in the mill.
