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本文介绍了在横截面为203mm×216mm的三维冷态模型中进行的水平理管磨损实验研究。管子的磨损率通过对金属圆环或圆环段试样的精密称重测得。实验结果发现在节涌和鼓泡状流态化范围内,水平埋管的磨损率随气体的表观速度、固体颗粒的尺寸及非球形度的增大而增大,随管子直径的增大而减小。磨损率在周向和轴向均呈明显的不均匀分布,床中央及管子下半周的磨损率明显高于边壁及管子上半周的磨损率。管束中管子的磨损率有较大程度的减轻,且周向分布情况也有所变化。结合二维冷态模型中所观察到的颗粒运动状态,简单分析了上述各种现象的原因。实验中还发现杨氏弹性模量是影响材料磨损率的主要机械性能。在流化床内,颗粒的冲击磨损远较摩擦刮削磨损严重。磨损的孕育时间很短,在实际工业过程中可以忽略不计。
This paper presents an experimental study of horizontal tube wear in a three-dimensional cold model with a cross section of 203 mm × 216 mm. The wear rate of the pipe is measured by precision weighing of the metal ring or ring section sample. The experimental results show that the wear rate of horizontal buried pipe increases with the increase of apparent gas velocity, the size of solid particles and the degree of non-sphericity within the range of bubbling and bubbling fluidization. As the diameter of the pipe increases And reduce. The wear rate showed obvious uneven distribution in the circumferential and axial directions. The wear rate in the middle of the bed and the lower half of the tube was significantly higher than that of the first half of the wall and the tube. Tube bundle tube wear rate to a greater extent reduce, and the circumferential distribution has also changed. Combined with the particle movement observed in two-dimensional cold model, the reasons for the above phenomena are briefly analyzed. The experiment also found Young’s modulus of elasticity is the main mechanical properties that affect the material wear rate. In the fluidized bed, the impact wear of the particles is far more severe than that of the friction scraping. Wear a very short incubation time, in the actual industrial process can be ignored.