Experimental study on gas-liquid dispersion and mass transfer of dislocated-blade Rushton impeller

被引：0
|
作者：
Ran S.-H. [1 ,2 ]
Zhou S.-J. [1 ,2 ]
Yang F.-L. [1 ,2 ]
Li B. [3 ]
机构：
[1] School of Mechanical Engineering, Shandong University, Jinan
[2] Key Laboratory of High-Efficiency and Clean Mechanical Manufacture of Ministry of Education, Shandong University, Jinan
[3] Economic Technology Research Institute, State Grid Shandong Electric Power Company, Jinan
来源：
Zhou, Shen-Jie (zhousj@sdu.edu.cn) | 1600年 / Zhejiang University卷 / 51期
关键词：
Dislocated-blade impeller; Gas-liquid dispersion; Gas-liquid stirring; Mass transfer property;
D O I：
10.3785/j.issn.1008-973X.2017.07.014
中图分类号：
学科分类号：
摘要：
The dislocated-blade Rushton impeller was designed in order to strengthen the performance of gas-liquid mixing of the standard Rushton paddle. The gas-liquid dispersion characteristics, mass transfer properties and gassed power consumption of those two impellers were investigated by gas-liquid stirring experiment under the condition of different stirring speed and air-flow rates. Bubble dispersion state in the stirring tank was observed by using visualization technology. The bubble diameter was obtained by the image processing method. The sodium sulfite test method was used to calculate the oxygen volumetric mass transfer coefficient. Results indicate that compared with the standard Rushton impeller, the areas in the axial direction influenced by the dislocated-blade Rushton impeller are broader, the bubble distribution in the stirring tank is more uniform and the bubble diameter is apparently smaller. In the certain range of control condition, the rates of mass transfer and gas dissolving are effectively improved by using the dislocated-blade impeller. At the same conditions, the power consumption and the aerated power drop after gassing of the dislocated-blade impeller are small. The performance of the carrier gas ability of the dislocated-blade impeller is strong, so it is more suitable to be applied to the gas-liquid stirring operation. © 2017, Zhejiang University Press. All right reserved.
引用
收藏
页码：1368 / 1373
页数：5
相关论文
共 17 条
  • [11] Luan D.-Y., Zhou S.-J., Chen S.-Y., Et al., Chaotic agitation characteristics of shifted 6-bent-blade impeller in pseudoplastic fluid, Chemical Engineering (China), 39, 9, pp. 41-46, (2011)
  • [12] Zhang R.-S., Zheng Y., Cheng Y.-S., Study of measuring micro-bubble diameter, Journal of Experiments in Fluid Mechanics, 19, 2, pp. 91-95, (2005)
  • [13] Ma Z.-J., The measurement of bubble size distribution by CCD method, Chemical Industry Times, 15, 11, pp. 8-12, (2001)
  • [14] Linek V., Benes P., Sinkule J., Et al., Non-ideal pressure step method for k<sub>L</sub>a measurement, Chemical Engineering Science, 48, 93, pp. 1593-1599, (1993)
  • [15] Linek V., Kordac M., Moucha T., Evaluation of the optical sulfite oxidation method for the determination of the interfacial mass transfer area in small-scale bioreactors, Biochemical Engineering Journal, 27, 3, pp. 264-268, (2006)
  • [16] Zhao J.-C., Gas-liquid dispersion and mass transfer characteristics of non-coalescing system in a gas-liquid stirred reactor, (2010)
  • [17] Yang F.-L., Zhou S.-J., An X.-H., Gas-liquid hydrodynamics in a vessel stirred by dual dislocated-blade Rushton impellers, Chinese Journal of Chemical Engineering, 23, 11, pp. 1746-1754, (2015)
12