三重环流生物流化床的流体力学与传质特性

从气相含率，液体循环速度和体积氧传质系数方面研究自行设计新型结构的三重环流生物流化床的流体力学与传质特性。流化床反应器的有效体积２３Ｌ，实验条件是以空气为气相，水为液相，树脂为固相，固含率分别为０％，３％，６％和９％。实验结果表明，气相含率是影响反应器流体力学和传质特性的主要因素，气相含率增大可降低液体循环速度，增大体积氧传质系数。

HYDRODYNAMICS AND MASS TRANSFER OF TRIPLET LOOP BIOLOGICAL FLUIDIZED BED

Hydrodynamics and mass transfer of triplet loop biological fluidized bed reactors were studied in terms of gas holdup, liquid circulation velocity and volumetric mass transfer coefficient. The effective volume of the experimented reactor is 23 liter. The reactor was performanccd for both of airwater or airwaterresin particle system, solids loading are 0%, 3%, 6% and 9% respectively. It was bound from experiments that the main factor affecting hydrodynamics and mass transfer is gas holdup. Liquid circulation velocity decreases with increase in the gas holdup, whereas volumetric mass transfer coefficient increases with it. Compared with performance in conventional loop reactor, the gas holdup in triplet loop reactor increases by ten to fifteen percent, and volumetric mass transfer coefficient in triplet loop reactor increases by over ten percent. A correlation for calculating volumetric mass transfer coefficient was developed, which is correlated by physical parameters and operating conditions.