三相浅层鼓泡塔颗粒悬浮特性

研究了F383 mm的浅层鼓泡塔内高径比(H/DT)、气体分布器、固体浓度(Cs)对气含率和临界悬浮气速(Ugc)的影响. 结果表明，当H/DT<1.5时，随H/DT增大，气含率增大，而Ugc明显下降；当H/DT>1.5时，气含率减小，Ugc变化不大，优化的H/DT约为1.5. 采用四管管式气体分布器，当环径比(d/DT)为0.4时，Ugc最小. 气含率随Cs增大而减小，Cs超过15%(j)时，Ugc随Cs变化不大. 最后，推导得到Ugc的经验关联式，可为工业反应器提供一定指导.

Solid Suspension Characteristics in a Three-phase Shallow Bubble Column

The influences of aspect ratio (H/DT), gas sparger and solid concentration (Cs) on gas holdup and critical gas velocity of solid suspension (Ugc) were investigated in a 383 mm i.d. three-phase shallow bubble column. The results show that when H/DT is smaller than 1.5, gas holdup increases and Ugc decreases with the increase of H/DT. However, when H/DT is larger than 1.5, the effect of H/DT on Ugc is insignificant. Gas sparger has great effect on Ugc, when d/DT is equal to 0.4, the value of Ugc is minimum. Gas holdup decreases with the increase of Cs. The effect of Cs on Ugc is insignificant, when Cs is larger than 15%(j). Finally, the empirical correlation is proposed to describe their quantitative effects on Ugc to give some physical insights into the experimental phenomenon.