气-液-固三相搅拦槽中液相氧传递性能的研究

Mass Transfer Characteristic of Oxygen in Liquid in Three-phase Stirred Vessels

在机械搅拌槽中使用翼形轴流桨（Ｋ４）、圆盘涡轮桨（ＤＴ）、６叶４５°斜叶桨（６ＰＴＤ、６ＰＴＵ）（排出流向下，向上）对低粘度三相体系的液相氧传递性能与悬浮液浓度、通气水平及搅拌功率之间的变化规律作了实验研究。实验得出：Ｋ１ａ∝（Ｐｇ／Ｖ）ｋ；当悬浮液浓度没有使液相表观粘性产生明显改变时，颗粒的存在、通气量的提高都有助于Ｋ１ａ的提高。翼形桨由于较好的轴向分散及混合性能，在相同的搅拌功率输入下，Ｋ１ａ保持较高的水平。

This article presents the influences of suspenson concentration, gas volume in liquid and power consumption on gas liquid mass transfer characteristic for low viscosity system using a new type axial impeller (K 4), 45°pitched blade disk turbine (pumping down and up) and disk turbine (DT) respectively in three phase stirred vessels, It is concluded that: K 1a∝(P g/V) k ; and if the apparent viscosity of suspension changes little due to the suspension concentration, the presence of solid makes the volumetric mass transfer coefficient K 1a increase, and K 1a is enhanced with the increasing of gas volume, Because the new type axial impeller (K 4) produces higher axial dispersion and mixing, the K 1a value keeps higher in same power consumption.