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自行设计并搭建中心提升管内循环流化床冷态试验台,试验研究提升管风速、鼓泡床风速、鼓泡床静床高、床料平均粒径对颗粒循环流率的影响。试验结果表明:对于给定的床料,颗粒循环流率随两床风速的增加而增加,并且当提升管风速或鼓泡床风速分别增加到一定程度时,颗粒循环流率增加趋缓;固定两床风速,颗粒循环流率随鼓泡床静床高的增大而增加,随物料平均粒径的增大而减小。通过实验数据回归,得到颗粒循环流率计算关联式,计算值相对误差在±18%以内,可以很好地预测颗粒循环流率。
The cold test bench of the circulating fluidized bed in the riser was designed and constructed by ourselves. The influence of the velocity of the riser, the velocity of the bubbling bubble, the height of the bubbling bed, the average height of the bed, on the circulating rate of the particles was investigated. The experimental results show that for a given bed material, the circulating rate of particles increases with the increase of the velocity of the two beds, and the increase of the circulating rate of the particles slows down when the velocity of the riser or the velocity of the bubbling bed increases to a certain extent respectively. The velocity of two beds and the circulation rate of particles increased with the increase of height of bubble bed, and decreased with the increase of material average particle size. Through the regression of experimental data, the formulas for calculating the circulating flow rate of the particles are obtained, and the relative errors of the calculated values are within ± 18%, which can well predict the circulating flow rate of the particles.