摘要
本文开发了一种新的物系,用 Na_2SO_3溶液吸收空气中的 O_2,并伴有物理解吸 C_2H_4来同时测定α和 k_L,以保证α和 k_L 的测定在同一流体力学条件下进行。在单气泡时,将 Na_2SO_3-O_2-C_2H_4系统测得的α_(chem)与通过气泡大小及上升速度经计算而得到的α_(■eo)进行了比较,校核了α_(chem)的准确性,并将此系统测得的 k_(L,C_2H_4)与化学法测得的 k_(L,O_2)进行了比较,得知它们十分接近,且其关系符合 Danckwerts 模型。将该物系用于气泡群,测定了不同空塔气速下的α、k_L 和ε,并进行了数据关联,取得了相当满意的结果。通过对不同清液层高度下传质系数的测量,发现喷嘴附近的传质系数比全塔平均值高3～5倍,说明有相当比例的传质发生在喷嘴附近。
A new system of sulfite oxidation accompanied by C_2H_4 desorption is proposed to determine interfacial area and liquid side mass transfer coeffici- ent simultaneously.This method ensures that k_1 and a be measured under identical hydrodynamic conditions.The interracial areas determined from the new system and from geometrical calculation by measurement of bubble size and rising velocity for single rising bubbles shows reasonable consistancy. The values of mass transfer coeffients k_(L,C2H4) and k_(L,O2)are comparable and agree well with Danckwerts surface renewal model. Applying the new system to bubble swarms,the values of a,k_L and ε are measured at different superfacial gas velocities.Satisfactory results are obtained after the data correlation.Liquid side mass transfer coefficients at different liquid heights are measured.It is found that the values of k_L near the gas sparger is as 3 to 5 times as that for free rising bubbles,which shows that a fairly amount of mass transfer occures near the gas sparger.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1989年第4期16-23,共8页
Chemical Reaction Engineering and Technology
关键词
鼓泡塔
相界面积
液相传质系数
化学法
测定
Bubble Column
Interfacial Area
Liquid Side Mass Transfer Coefficient
