Gas holdup and liquid circulation in an internal airlift loop reactor were investigated. The reactor consists of one conventional draft tube and three convergence-divergence draft tubes. Experiments were carried out in two-phase systems with air-water and air-CMC (carboxyl methyl cellulose) solutions and in three-phase system with air-water-resin particles, respectively. The two-phase drift-flux model was used to estimate gas holdup for three-phase Newtonian and two-phase non-Newtonian systems. It is shown that gas holdup in convergence-divergence draft tube is higher than that in conventional draft tube and increases with superficial gas velocity. The variation of structural parameters of draft tubes has little effect on gas holdup in the two-phase system and the three-phase system. The mathematical model, which is based on drift-flux model, can describe the liquid circulation in reactor satisfactorily.%研究了气升式内循环反应器内的气含率与液体循环.反应器包含一个传统的导流筒和三段缩放型导流筒.通过实验分别对气-水、气-CMC(羧甲基纤维素)溶液两相系统和气-水-树脂颗粒三相系统进行了研究.用两相漂移通量模型对三相牛顿流体和两相非牛顿流体进行了评价.结果表明,三段缩放型导流筒内的气含率高于传统的导流筒,且随表观气速而提高.在两相和三相系统中,导流筒结构参数的变化对气含率的影响很小.基于漂移通量模型的数学模型很好地描述了反应器内的液体循环.
展开▼
