双进双出磨煤机制粉系统机理建模与仿真

Mechanism Modeling and Simulation on Pulverizing System of a Double-inlet Double-outlet Coal Mill

为了提高双进双出磨煤机制粉系统运行的安全性和经济性,分析钢球在双进双出磨煤机中的磨损机理,建立了钢球磨损与磨煤工况间的钢球磨损规律数学预测模型.基于质量和能量平衡,考虑原煤水分及磨煤过程中机械热参与能量平衡,建立了双进双出磨煤机三入三出动态数学模型,并以某600 MW机组配备的MGS-4060-A型双进双出磨煤机为例对模型进行计算与仿真.结果表明:在双进双出磨煤机额定运行工况下,热风量、冷风量和给煤量阶跃扰动时,磨煤机的出口温度、料位和出力的仿真结果均与实际运行结果相符.

To improve the safety and economy of a pulverizing system for double-inlet double-outlet coal mills, a mathematical prediction model was established to study the relationship between the ball wear and the grinding condition by analyzing the wear mechanism of the steel ball. Meanwhile, a three-input threeoutput dynamic model was set up for the double-inlet double-outlet mill based on the mass and energy conservation considering the heat absorption in raw coal moisture evaporation and the mechanical heat pro- duced in coal grinding, with which, calculations and simulations were conducted for a MGS-4060-A doubleinlet double-outlet coal mill matching 600 MW power units. Results show that under the step disturbance of hot air flow, cold air flow and coal feed rate at rated operating conditions, the simulated outlet temperature, material level and mill output agree well with actual operation data of the coal mill.