Abstract: Particle erosion or attrition products were obtained in a fluidized bed evaporator with vapor-liquid-solid flows at different solid holdup and circulating flow rate of liquid phase after one-month to two month’s operations. The particles from erosion were characterized and the effects of key factors such as solid holdup，circulating flow rate of liquid phase on erosion amounts，particle size and polydispersity were analyzed. Possible particle attrition mechanism was discussed. Experimental results indicated that the powder diameter resulting from the particle attrition showed a log-normal distribution with three peaks，indicating a mixture mechanism of particle attrition. Other preliminary results were presented as follows：the attrition rate of solid particles increased with the decrease of solid holdup and the increase of circulating flow rate of liquid phase，and the latter became important at lower solid holdup；the erosion rate decreased with time；the effective diameter of powder resulting from particle attrition decreased with solid holdup，circulating flow rate of liquid phase and time；the polydispersity of powder decreases with solid holdup and circulating flow rate of liquid phase.

Key words: vapor-liquid-solid flow, fluidized bed, evaporator, solid particle, attrition

摘要： 在不同循环流量和固含率条件下，通过1～2个月的操作运行实验，得到了汽-液-固三相循环流化床蒸发器内聚乙烯颗粒的磨损产物，分析了三相流化床的固含率和循环流量等条件对颗粒磨损速率、磨损粉体的直径和多分散度的影响，并探讨了颗粒磨损的机理。结果表明：磨损产物的粒径呈现三峰对数-正态分布，具有混合磨损机理特征；颗粒的磨损速率随固含率的减小和循环流量的增加而增大；较低固含率条件下，循环流量对颗粒的磨损速率影响较大；磨损速率随着运行时间的延长而减小；磨损粉体的粒径随固含率、循环流量、磨损时间的增加而减小；磨损颗粒的多分散度随固含率和循环流量的增加而减小。

关键词: 汽-液-固流, 流化床, 蒸发器, 固体颗粒, 磨损