JIANG Zhuting, NING Xiang, ZHAO Zengyi, WU Nanxing, LIAO Dahai

(College of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract: In order to improve the properties of SiN particles prepared by dry granulation, the influence of the reamer’s three  dimensional parameters on flow field is analyzed, and the particle sphericity is analyzed by SEM. The Euler gas-solid two-phase flow model is constructed. Three physical models for the granulation room are designed according to different bottom parameters. The turbulence in the flow field is solved by the modified RNG k-ɛ model. The difference of particle volume fraction distribution in the granulation chamber is analyzed. The numerical results are compared with the experimental. The numerical results show that when the reamer’s thickness is 7 mm, 8 mm and 9 mm, the axial particles volume fraction is 0.36, 0.30 and 0.33 respectively, the radial particles volume fraction is 0.33, 0.31 and 0.34 respectively. The experimental analysis shows that when the reamer’s thickness is 8mm, the sphericity of the particles is the highest and the fluidity is the optimal, which verifies the correctness of the numerical simulation. The above methods and results have certain theoretical significance for improving the properties of SiN particles prepared by dry granulation, and provide some design basis of the reamer’s three dimensional parameters.
Key words: silicon nitride particles prepared by dry method; three dimensional parameters of the reamer; gas-solid two phase flow; particle properties