Mass Transfer in a Cross-Flow Rotating Packed Bed
Date Issued
2006
Date
2006
Author(s)
Chen, Ching-Ming
DOI
zh-TW
Abstract
This research is to investigate the characteristics of a cross-flow rotating packed bed. The system has less tendency of flooding due to the flow patern of gas and liquid. As a result, the system can be operated at a higher gas/liquid ratio and is expected more practical for industrial applications.
Firstly, we discussed the characteristics of the cross-flow rotating packed bed based on absorption percentage and overall mass transfer coefficient (Kga). According to the experimental results, the absorption percentage increased with both rotational speed and liquid rate, but the increase of gas rate caused the absorption percentage decrease. As to the effects of operation factors on mass transfer coefficients, increase of rotational speed, liquid flow rate and gas flow rate would enhance the efficiency and raise the mass transfer coefficients. The relation between mass transfer coefficients and distribution of liquid in the bed was also discussed. The experimental results showed that at low rotational speed (500 rpm) and low liquid flow rate (0.2 L/min), mal-distribution of liquid might occur. The liquid perhaps only flow through the lower part of the bed, and thus the mass transfer coefficient decreased. An empirical correlation for efficiency of bed usage was obtained.
Subjects
錯流式
分佈情形
Cross-Flow
Distribution
Type
thesis
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