中文摘要：

提出了一种新型的强制外循环三相环流反应器结构，根据结构特点及流动状态的不同，将反应器分为6个不同的流动区域。在矽300mm×1700mm的实验装置内，采用氧气气提-空气解吸法，详细考察了内环表观气速0.006-0.19m／s、外循环液速0.03，0.05m／s、固含率5％，10％，15％时不同流动区域的体积传质系数。发现外循环液流影响区体积传质系数最大，最高可达O.754S^-1，外环环隙区最小，不超过0.043^s-1，环流反应器整体体积传质系数与气液分离区体积传质系数接近。适当扩大内、外环截面积比有利于提高环流反应器的传质性能。环流反应器整体体积传质系数随内环表观气速和外循环液速的增加而增加，随颗粒浓度的增加略有降低。

英文摘要：

A novel three-phase airlift loop reactor with forced slurry phase circulation was proposed. The reactor was divided into six regions. Experiment was conducted in a cold model apparatus with 300 mm ID plexiglas column and 1700 mm in height over a wide range of operation conditions with the superficial velocity in draft tube, UGr, from 0.006 to 0.19 m/s, the liquid velocity pumped into the reactor, Ucir, from 0.0307 to 0.0511 m/s, and the volumetric solid concentration, εs, from 5% to 15%, respectively. The mass transfer coefficient, kLa, was measured in each flow region of the reactor by employing a new O2/air steady-state method. It was found that with kLa as high as 0.754 s^-1, the downcomer affected region has a biggest mass transfer coefficient than other regions, while the annulus region, with kLa no more than 0.043 s^-1, has a smallest one. Interestingly, the mass transfer coefficient of gas-liquid separation region approximately equals to that of whole reactor. In addition, the mass transfer coefficient of whole reactor increases with the increase of superficial gas velocity and superficial liquid velocity pumped into the reactor, but decreases with increasing solid loading.