搅拌磨DEM-CFD耦合仿真研究及搅拌器强度分析

为了研究具有自主知识产权的大型立式螺旋搅拌磨机结构强度与动力匹配,在立式螺旋搅拌磨机试验台进行了试验研究,建立立式搅拌试验磨机的离散元(DEM)-计算流体动力学(CFD)多学科耦合模型,进行搅拌器动态分析,搅拌器阻力矩仿真与试验吻合,搅拌磨DEM-CFD多学科耦合建模及仿真方法,对搅拌磨动力学分析是有效的。为评价320 t立式螺旋搅拌磨机的结构强度与动力性能,建立了320 t级立式螺旋搅拌磨机离散元模型和有限元模型,分析了搅拌器启动和运行的阻力矩,分析了启动速度和钢球尺寸对搅拌器阻力矩的影响,可为搅拌磨动力匹配提供设计依据,分析了搅拌器启动与运行过程中的结构强度,结果表明搅拌器结构强度可靠,现场测试结果验证了数值模拟结果。

Research of Multidisciplinary Coupling Simulation of the Vertical Stirred Mill Based on DEM-CFD and Analysis of the Screw Agitator Structural Strength

In order to analyze the structure strength and power matching of giant vertical stirred mill with independent intellectual property rights, the vertical stirred mill experimental rig was established to make the experimental research. In the meantime, a simulation model based on DEM and CFD was built to make the dynamic analysis for the screw agitator. The results showed that the simulation model of the vertical stirred mill was consistent with its experiment. That is to say, the DEM-CFD model of the vertical stirred mill could be accurately reflected the dynamic characteristics of the screw agitator. To evaluate the performances of the 320t giant mill, a DEM model and a finite element model were set up respectively. The factors such as the media balls in the mill, starting speed were analyzed for the effect on the agitator drag torque. It was used for power system matching of stirred mill. Also, the maximum stress result of the screw agitator was got in its operation condition. It turned out that the structural strength of the agitator was reliable, and the test results from running site validated the simulation conclusion.