有色金属(选矿部分)

针对ZMG113型中速磨煤机因煤粉颗粒冲蚀导致的严重磨损问题，基于离散元法(DEM)联用Box-Behnken响应面法研究了磨煤机运行参数对生产综合效益即磨煤机筒壁衬板单位时间磨损程度的影响。研究建立了风环风速、煤粉直径、衬板初始入射角与生产综合效益之间的回归方程数学模型，以3 s内衬板所受法向与切向累计能量之和的倒数作为综合效益，设计了包含17组试验的BBD方案，并建立二阶多项式回归模型，分析了单因素及多因素交互作用对衬板磨损的影响，并研究了两种不同结构衬板的响应效果。仿真结果表明，凸衬板模型响应回归方程的R²为0.92，平衬板模型响应回归方程的R²为0.97，可以较好反应各试验因素与磨煤机磨损程度之间的关系。从单因素来看，风环风速和衬板初始入射角的影响较大。从多因素来看，风环风速和衬板初始入射角的交互影响最明显。衬板初始入射角确定后，对于凸衬板模型，当颗粒直径为0.4 mm，风环速度为10 m/s时，磨煤机生产综合效益达到最大值；对于平衬板模型，风环风速为10 m/s时，煤粉直径为0.07 mm或0.5 mm时，综合效益达到最大值。相对于凸衬板模型，平衬板模型综合效益Q的最高点降低了18.08%，最低点上升了28.62%，即平衬板模型有效降低了磨煤机衬板严重磨损区域的磨损程度。本研究为磨煤机耐磨部件结构优化与运行参数调控提供了数据支撑与理论依据，对提升电厂制粉系统经济性与可靠性具有工程参考价值。

This paper addressed the severe wear issue of the ZMG113 medium-speed coal mill caused by coal particle erosion. Based on the Discrete Element Method(DEM) combined with the Box-Behnken Design(BBD) response surface methodology,the influence of operational parameters on the comprehensive production efficiencyspecifically,the wear rate per unit time of the mill liner-was investigated. A regression model was established to correlate the wind ring velocity,coal particle diameter,and initial impact angle of the liner with production efficiency,where the efficiency was defined as the reciprocal of the total cumulative normal and tangential energy absorbed by the liner within 3 seconds. A BBD experimental plan comprising 17 trials was designed,and a secondorder polynomial regression model was developed to analyze the effects of single factors and multi-factor interactions on liner wear. Additionally,the wear responses of two liner structures(convex and flat) were compared.Simulation results demonstrated that the regression model for the convex liner achieved an R2 of 0. 92,while the flat liner model yielded an R² of 0. 97,indicating strong correlations between experimental factors and wear behavior. Single-factor analysis revealed that wind ring velocity and initial impact angle exerted the most significant influence. Multi-factor interaction analysis highlighted the dominant interplay between wind ring velocity and initial impact angle. For the convex liner,under a fixed initial impact angle,the optimal comprehensive efficiency was achieved at a particle diameter of 0. 4 mm and wind ring velocity of 10 m/s. For the flat liner,maximum efficiency occurred at a wind ring velocity of 10 m/s with particle diameters of either 0. 07 mm or 0. 5 mm. Compared to the convex liner,the flat liner exhibited an 18. 08% reduction in peak wear and a 28. 62% increase in minimum wear resistance,effectively mitigating severe wear in critical regions. This study provided data-driven insights and theoretical foundations for optimizing wear-resistant liner structures and operational parameters in coal mills,offering engineering significance for enhancing the economic efficiency and reliability of power plant pulverizing systems.