中文摘要：

内循环生物三相流化床由于可实现气液固三相充分接触而在废水处理方面表现出明显的优势，已经广泛应用于冶炼废水、采油废水、化肥废水的生物处理。目前，在处理高浓度有机废水的过程中如何使三相流化床提高氧转移效率、降低能耗是此领域的一个研究热点，国内外学者普遍采用在反应器内设置挡板、多孔筛板、填料或静态混合器等方法改善反应器液体力学与传质性能，这些内构件可以提高反应器内气含率、增大体积氧传递系数，但是又增大了液体流动阻力、减少了液体循环流量，对于废水生化处理过程，易造成反应器内微生物阻塞、载体堆积，以致无法正常流化。本文设计了漏斗型导流装置作为一种新型内构件，安装于反应器导流筒顶端，通过改变气液固三相的运动方向来强化反应器多相混合与传质，同时产生较小的流动阻力以降低操作能耗。实验研究了漏斗型导流内构件对内循环流化床升流区与降流区气含率、液相混合时间、液体循环速度以及体积氧传质系数的影响规律。

英文摘要：

The effects of funnel-shape internals on hydrodynamics and mass transfer in an internal loop three-phase fluidized bed were investigated. Three different kinds of internals were designed which were setup on the top of draft-tube in terms of horizontal angle and outer diameter, and gas hold up, liquid mixing time, liquid circulation velocity and mass transfer coefficient were measured respectively. It was shown that the riser gas holdup and mass transfer coefficient increased by 10% and 15% than that without such an internal, liquid mixing time decreased by 10% to 25%. When the superficial gas velocity was less than 0. 5 cm · s^-1 , liquid circulation velocity increased with the setup of such internals. Liquid circulation velocity decreased when the superficial gas velocity was above 0. 5 cm · s^-1. In addition, the variation of structural parameters of funnel-shape internals had significant effects on hydrodynamics and mass transfer.