矿浆搅拌过程中不同位姿搅拌桨叶的磨损状况分析

Analysis on the Wear Condition of Different Positional Blades in the Process of Pulp Mixing

桨叶作为搅拌设备的核心部件,在矿浆混合液中其磨损现象非常普遍,严重时导致桨叶搅拌效率降低,运行稳定性变差。运用液固耦合方法剖析液固两相流中三种不同位姿桨叶的表面剪切作用,并由此剖释桨叶的磨损状况。从三种位姿桨叶剪切应力云图可得,桨叶表面的矿物固体颗粒分布多集中于桨叶端部,桨叶表面的剪应力从桨叶根部向端部逐渐增大,矿浆颗粒与桨叶表面的彼此剪切作用逐渐增强,桨叶端部区域冲蚀磨损严重。增大矿浆混合液浓度后,矿物固体颗粒与桨叶表面的相互剪切作用增强,冲蚀磨损加剧。

The blades,as the core part of the mixing plant,its wear phenomenon in slurry mixture is very common, which has a negative influ-ence to efficiency of the blade mixing and reduces the operation stability. Based on liquid-solid two-phase flow, the shear stress distribution and the wear condition 45°, 90°, propeller mixing blades in different slurry concentration is analysed.The result shows that the fluid pressure increases gradually along the end of the 3 blades, and the interaction between the solid particles and the blade surface is gradually enhanced,and the end of the blade wears seriously.With the increase of the concentration of the mixed liquid, the interaction between mineral particles with the blade surface shear enhances, and the wear intensifies.