摘要：在直径为 4 cm 的有机玻璃流化床中，对由不同尺寸和质量分数 的铁矿石和煤颗粒组成的二元气-固流态化系统进行了流化特征的实 验研究，得到了该系统的流化特性曲线，给出了临界流化速度和二元系 统混合颗粒平均直径之间的关系， 用该关系式对临界流化速度进行了 预测，并且将预测值和实验值进行了比较。 结果表明，当煤颗粒的质量 分数为 10％时， 临界流化速度 umf 与颗粒直径的平方 dm² 的关系为 umf= 0.13dm²+1.2； 当煤颗粒的质量分数为 20%时， 两者的关系变为 umf= 0.12dm²+1.2，预测值与实验值误差在 10%以内。 

关键词：流化床；流化特性曲线；临界流化速度

Abstract：A binary mixture fluidization system composed of iron ore and coal particles of different size and component was experimentally studied in an organic vitreous fluidized bed of 4 cm inner diameter. The fluidiza tion curves of the binary mixture fluidization system was obtained and the relation of the minimum fluidizing velocity and binary mixture aver age particle diameter was given. The critical fluidization velocity was predicted with this relationship and the prediction value and the expe ri mental value were compared. Minimum fluidizing velocity had a relation of umf=0.13dm²+1.2 when 10 %（mass fraction） coal particles was mixed， and umf=0.12dm²+1.2 was observed for that of 20 % coal particles mixed，and the error of prediction value and experimental value was less than 10 %. 

Keywords：fluidized bed；fluidization curve；critical fluidization velocity