环隙气升式反应器在非牛顿流体体系中的应用──反应器特性研究和体积氧传递系数的关联

The Application of Annulus Air-Lift Reactor to Non-Newtonian Fluid System ──The Characteristics of the Reactor and a Correlation of Volumetric Mass Transfer Coefficient

以羧甲基纤维素钠（ＣＭＣ）水溶液模拟非牛顿型发酵介质，在内径为０．１５ｍ，高为０．９７５ｍ的环隙气升式反应器内，考察了液体流变性质和导流筒结构对气液传质的影响，提出了体积氧传递系数（ＫＬａ）的经验关联式。实验表明：对于较高粘度的假塑性流体，反应器内部采用整体式导流筒结构，将有利于传质和混合，其性能优于采用开窗式导流筒或无导流筒的反应器。

Aqueous solutions of sodium carboxymethyl cellulose (CMC) were used to simulate non-newtonian media. The influence of non-newtonian flow behaviour and draft tube on mass transfer was examined in an annulus air-lift fermentor with 0. 15m in inner diameter and 0. 975m in height, and an empirical correlation was also proposed for the volumetric mass transfer coefficient (KLa). It was also found that as far as highly viscous pseudoplastic fluid is concerned, the introduction of a solid draft tube improves mass transfer and mixing. Therefore,its operational performance is superior to the reactor with window draft tube or without draft tube.