关键词: 立磨;ANSYS;工程仿真;喷口环

Abstract: Engineering simulation of the internal airflow before and after changing sectional area of the spout ring was studied.The gas flow in UM 46.4 vertical mill of 5000 t/d production line of Jidong Cement Luanxian Co.,Ltd.was taken as the object.The results show that the flow direction of the gas in the vertical mill cavity is turbulent.Before and after changing the sectional area of the spout ring,the internal gas flow trend is basically the same,and the velocity in the Y direction around the separator can be blown to meet the fineness requirements.As well as,there is a significant change in the turbulent flow around the lower and the upper part of the vertical mill.The smaller the sectional area of the spout ring,the smaller of the turbulent kinetic energy at the lower chamber,which can reduce the slag discharge,the suspension material in the small cavity can quickly falls back and then improve the efficiency of grinding;the greater of the favorable turbulent kinetic energy around the separator,the material particles that meet the requirements of fineness are more likely to converge around the separator and improve the efficiency of the selected powder,as well as improving the production of vertical mill.When the cross-sectional area of nozzle ring reduced from 2.27 m2 to 1.79 m2,the average machine-hour output increase from 400 t/h to 425 t/h.

Key words: vertical mill;ANSYS;engineering simulation;nozzle ring