UM46.4型水泥原料立磨工艺工程仿真与优化研究

Engineering Simulation and Optimization of UM 46.4 Type Cement Material Vertical Mill Process

采用工程仿真的方法,以冀东水泥滦县有限责任公司5000 t/d生产线生料磨系统中UM 46.4立磨中的气流为研究对象,分别对立磨喷口环截面积改变前后内部载物输送气流的变化进行了工程仿真研究。结果表明,立磨腔内气体的流动主体为湍流;在改变喷口环截面积前后,内部气体流动趋势基本相同,在选粉机周围Y方向速度都可以吹起满足细度要求的颗粒,而立磨下部小腔体和立磨上部选粉机周围区域湍流动却有明显变化;喷口环截面积越小,立磨下部小腔体的不利湍流动能越小,越有利于降低排渣量,使小腔体内悬浮物料快速回落,提高粉磨效率;选粉机周围的有利湍流动能越大,使符合细度要求的物料颗粒更容易向选粉机周围汇聚,提高了选粉效率,进而达到提高立磨台时产量。当喷口环截面积从2.27 m^2减小到了1.79 m^2,平均台时产量可由400 t/h提高到425 t/h。

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 m^2 to 1.79 m^2, the average machine-hour output increase from 400 t/h to 425 t/h.