Abstract:

Axial liquid and slurry velocity distributions in a slurry bubble column were measured by Pavlov tube under the condition of high superficial gas velocity（0.12—0.93 m•s^-1）and large solid concentration（0.1—0.3 based on slurry phase）.Experiment results showed that axial liquid and slurry velocity distributions became steeper with increasing superficial gas velocity and scale of bubble columns.On the contrary，velocity profiles did not obviously change with increasing solid concentration.Then normalized velocity profiles under different conditions could be approximately fitted by a single curve，which indicated that center-line velocity was a key parameter to predict bubble column scale-up effects.Under the experimental condition，Nottenkamper’s correlation was suitable for calculating the center-line velocity.Furthermore a one-dimension hydrodynamic model was presented to predict velocity distributions in the slurry bubble column.The model computational results agreed well with experimental data.

Key words:

浆态鼓泡塔, 流速分布, Pavlov管

摘要：

对高气速、大塔径条件下的湍动浆态床轴向速度进行了实验测定，提出了简化的一维流体力学模型。实验结果表明：固含率对浆料速度的径向分布影响不明显;采用中心速度和塔径作为参考量，则不同条件下的量纲1流速分布相似;高气速下中心速度随塔径的变化可近似用Nottenkamper关联式描述。提出了一维流体力学模型预测浆态床液速分布，模型计算结果与实验数据符合较好，模型较好地反映了浆态床反应器内液速分布随表观气速、固含率及塔径变化的规律。

关键词:

浆态鼓泡塔, 流速分布, Pavlov管