Research On Modeling Of Sintering Charging Process Of Iron Ore Powder Based On EDEM

After my country’s economy has entered a new normal,iron and steel enterprises have paid more attention to the efficient use of iron ore resources and the potential upgrading of operations.Iron ore powder sintering charging is an important part of the production process of iron ore powder sintering process.Charging has a great influence on the optimal utilization of raw materials and the improvement of sinter output and quality.The description of the behavior of the raw material particles in the charging operation and the optimization of the charging apparatus are the focus of the research.This article takes the sintering charging process as the research object,combined with the characteristics of the sintering raw material and the operating conditions,the distribution of raw material particles under different charging apparatus model is analyzed,and established nine-roll round-roll,round-roll reflection plate,wide-belt nine-roll and wide-belt reflection plate four kinds of charging apparatus model.Using discrete element method to simulate the sintering charging process.The main contents are as follows:(1)Combining the characteristics of sintering raw materials,three types of raw material particles were investigated:iron ore powder,flux and fuel.The cylinder model used for particle simulation parameter calibration was optimized,and the appropriate ratio of particle diameter,cylinder diameter to height was determined to be 1:24:96.For elastic viscous particles,the JKR model is selected,and the surface energy in the JKR model is obtained by the angle of repose calibrated by the particles.(2)For the iron ore powder,flux and fuel,the particle behavior of the raw material distribution process is simulated and analyzed,and the evolution process description of various particles in the charging process is explored.Under the same conditions of the same charging apparatus and the same operating conditions,the comparative analysis of the simulated raw materials are different types of single particle size,the same type,multiple particle sizes and different types,and different particle sizes.The distribution of particles under the action of the charging apparatus.Simulation modeling shows that the particle distribution obtained by the scheme of multiple materials and multiple particle sizes is more reasonable.(3)Four charging apparatus models of nine-roller round-roller,nine-roller reflecting plate,wide-belt nine-roller and wide-belt reflecting plate were established,and the optimal simulation scheme of the model was designed.Based on the orthogonal design,a model optimal scheme is constructed,which integrates the device type and operating condition parameters.The dimensionless average diameter of the upper and lower layers is used as the optimization criterion.The results show that:the device type and the moving speed of the trolley have the greatest influence on the segregation distribution of raw materials,followed by the influence of the inclination angle of the nine-roller or reflector and the rotation speed of the nine-roller,and the rotation speed of the round-roller or wide-belt roller the smallest;when the charging apparatus is a wide-belt reflector plate device,the reflector angle is 36°,the wide-belt roller speed is 61.3rpm,and the trolley speed is 0.06m/s,the difference between the dimensionless average diameter of the upper and lower layers is the largest,0.46,That is,the material segregation value is the largest under this kind of charging apparatus and operating conditions.The four types of charging apparatus are preferably:the wide-belt reflector plate device is 0.38 when the inclination of the reflector plate is 36°,the material particle size segregation effect is the best,but the flatness of the material surface is the lowest,and the nine-roller round-roller particle size segregation value is the worst.The difference between the dimensionless average diameter of the upper and lower layers is 0.32,but the flatness of the material is the best.In this paper,the discrete element method is used to model the sintering charging process,and the EDEM is used to simulate and optimize the charging apparatus based on the raw material characteristics.The establishment of various types of granular charging and model optimization methods is conducive to the efficient use of resources in the steel production process and the optimization of production operations.