| This paper studies the mechanical turbulence pulverizer which is used to crushcoal and dry coal. In this environment the mechanical turbulence pulverizer will haveserious wear from friction and collision of coal leading to affect the whole dynamicbalance. At present numerical simulation is the main way of the study of the impellermechanical gas-solid two-phase flow. Using numerical simulation study of coal millto realize the internal flow field of the mill visualization is one of the developmenttendency of the mill.In this paper geometric model is first established with the true size of the coalpulverizer in CAD. The coal pulverizer is divided into irrotational flow area androtational flow area. In the GAMBIT, the unstructured grids is used in the irrotationalflow area which structure is complex when the structured grid is used in therotational flow area. In FLUENT, standard k turbulence model is used tosimulate the single-phase in the coal pulverizer as the foundation with SIMPLEalgorithm and Rotating Reference Frame. The simulation results which show thesecondary flow and eddy current in the pulverizer internal is consistent with therelated documents conclusion.In order to simulate gas-solid two-phase flow and blade wear in the impeller,Lagrange particles orbital model single-phase coupling method is adopt in this paper.The trajectory of solid particles with the diameter of0.03mm,0.05mm and0.1mmin the coal pulverizer internal is calculated. Based on Tabakoff and Grand wearmodel, he blade wear rate and wear position are also calculated within the differentparticle size.Compared with the test results, the numerical simulation results verify thecredibility which has a guiding significance for the design optimization of coal mill. |
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