湍动浆态床流体力学研究(Ⅰ) 气含率及其分布规律

Studies on hydrodynamics of slurry turbulent bubble column(Ⅰ) Gas holdup and its radial distribution

对高气速、高固含率、大塔径条件下的湍动浆态床平均气含率和气含率径向分布进行了实验测定,结合工业实验数据,归纳出可用于工业条件的气含率计算关联式,给出了简化的流体力学模型用于气含率分布的模拟。结果表明,浆态床气含率将随塔径增加而降低,固含率与塔径之间存在交互影响;同时,气含率的径向分布也随气速和塔径的增大而改变,存在明显的放大效应,简化模型能够较好地模拟实验结果。

The slurry bubble column operating at turbulent flow regime is of practical importance. The average gas holdup and gas holdup radial distribution in the column were measured under the condition of high superficial gas velocity, high solid content and large column diameter, including both the experimental and industrial data. A novel gas holdup correlation was then obtained, which is applicable to industrial conditions. A simplified hydrodynamic model was developed to predict gas holdup distribution. Experimental results showed that gas holdup for the slurry system would decrease as the column diameter and solid content increased. In addition, inerease of either column diameter or superficial gas velocity would cause gas holdup distribution steeper in the radial direction. The model computational results agreed well with experimental data