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采用热态可视化流化床装置,在一定表观气速条件下,研究1073 K温度时不同粒级铁矿粉的黏结失流.根据对黏结失流影响程度的不同,可将矿粉颗粒分为三个粒径区间:中性气氛升温过程中失流的小粒径颗粒;还原至较低金属化率发生失流的中间粒径颗粒;还原至高金属化率也不发生失流的大粒径颗粒.分别对他们不同的影响机理进行了分析.研究还发现在正常流化条件下,随着矿粉颗粒粒径的增大,还原失流后床层的膨胀幅度会减小.
Using the thermal visualized fluidized bed unit, under the condition of apparent superficial gas velocity, the cohesion loss of iron ore with different particle size at 1073 K was studied.According to the different degree of influence on the viscosity loss, For the three particle size range: the neutral atmosphere during the loss of heat flow of small-size particles; reduced to the lower metalization rate of the occurrence of flow of intermediate particle size particles; reduction to high metallization rate is also no loss of large particles Diameter particles were analyzed respectively.The results also showed that under the normal fluidization conditions, with the increase of particle size of ore particles, the expansion of the bed will decrease after the reduction of the loss.