关键词: 汽-液-固流, 流化床, 蒸发器, 固体颗粒, 磨损

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