Aiming at solving the problem of complex and uneven flow field inside the coal pulverizer

a complete model of medium-speed coal pulverizer was established. The CFD software was used to solve the internal flow equation of the coal pulverizer. Moreover

DPM iteration was used to obtain particle flow parameters

and the internal flow of the medium-speed coal pulverizer and distribution characteristics of outlet air-powder at different rotation speeds of dynamic classifier were explored. The results showed that

the distribution characteristics of primary air at four pulverizer outlets were good and consistent with the test results. When the powder diameter was small

the powder mass flow deviation at four pulverizer outlets was small

and the fluctuation was not obvious with the increase of the rotation speed of the dynamic classifier. With the increase of powder diameter

the motion trajectory of powder showed a wall adherent motion

and the powder mass flow deviation at four pulverizer outlets gradually increased. Furthermore

for coal particles with large diameters

with the increase of the rotation speed of the dynamic classifier

the powder mass flow deviation at four pulverizer outlets gradually decreased.