流化床内水平埋管的三维冷态磨损实验研究  

The three Dimensional Cool-Sate Wear Experimental Research of the Immersed Horizontal Tubes in the Fluidized Bed

作　　者：祝景旭 周玉铭[2] 

机构地区：[1]加拿大西安大略大学 [2]西安交通大学,陕西710049

出　　处：《中国锅炉压力容器安全》1994年第4期14-20,共7页China Boiler and Pressure Vessel Safety

摘　　要：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。Experimental study of horizontal tube wear was carried out at a 3-dimension cold model. The er- rosion rates were measured by accurately weighing small rings or ring segments after exposure to fluidized parti- cles. The wear rates were found to increase with increasing void velocity, particle size and partictle angularity and with decreasing tube diameter. Most metal loss occurred around the bottom of the tubes and the central part of the column. Young's modulus appears to be the major tube material property affecting the wear rates. Particle impacts were much more important than abration.

关 键 词：流化床 埋管 磨损 锅炉 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程]