加裝擋板之葉片式旋轉填充床特性之研究

Characteristics of Blade-Packing Rotating Packed Bed with Baffles

宋威德(Wei-Der Sung)

指導教授 ： 陳昱劭

中原大學/工學院/化學工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100601

摘要

加裝擋板葉片式旋轉填充床之特性至今尚未被建立，因此在本實驗中研究此系統之壓降，並以吸收揮發性有機物(VOCs)實驗得到去除率及總括體積氣膜質傳係數(KGa)，探討轉速、氣體流率、液體流率、擋板及填充物對上述特性之影響。此外，首次建立此系統壓降與總括體積氣膜質傳係數之迴歸式。
由實驗結果得知，壓降隨轉速及氣體流率增加而上升，液體流率提高對壓降影響並不明顯，因為在離心力下液體滯留量較小。除此之外，濕床壓降小於乾床壓降，而且有擋板系統之壓降小於無擋板系統，減少約33~59%。和各式結構旋轉填充床相比，擋板葉片式旋轉填充床之壓降為最小。KGa隨著轉速、氣體流率及液體流率增加而上升，使用低亨利常數VOC時，KGa受氣體流率影響較大、液體流率影響較小；但使用高亨利常數VOC時，情況則相反，而使用有擋板系統之KGa較無擋板系統大。此外，修正過後之質傳係數較葉片式旋轉填充床大，可提升約56%。
將實驗結果求出壓降及質傳迴歸式，其中質傳迴歸式包含考慮亨利常數之影響，可合理預測在不同操作條件下，加裝擋板葉片式旋轉填充床之總括氣膜體積質傳係數。

關鍵字

旋轉填充床 ； 壓降 ； 質傳 ； 葉片 ； 擋板 ； 吸收

並列摘要

The characteristic of blade-packing rotating packed bed with baffles has not yet been established. Therefore, this study examined the pressure drop, removal efficiency and the overall volumetric gas-side mass transfer coefficient (KGa) in blade-packing rotating packed bed with baffles by absorption of VOCs. These characteristics were investigated with the effects of rotational speed, gas flow rate, liquid flow rate, baffles and packing. Besides, the correlations of KGa and pressure drop were proposed for the blade-packing rotating packed bed with baffles for the first time.
According to the experimental results, the pressure drop increased with increasing gas flow rate and rotational speed, and was not significantly affected by liquid flow rate. In addition, the pressure drop in a wet bed is lower than that in a dry bed. For the effect of baffles, it is found that a 33~59% reduction on pressure drop could be achieved in a bed with baffles. Compare with other types of rotating packed bed, the pressure drop of blade-packing rotating packed bed with baffles is the smallest. In the VOCs absorption process, the KGa increased with increasing rotational speed, gas flow rate and liquid flow rate. When using the VOC with low Henry's law constant, the KGa was found influenced more significantly by gas flow rate when compared with a VOC with high Henry's law constant. Rotating packed bed with baffles shows better mass transfer efficiency compared to a bed without baffles. Besides, the corrected mass transfer coefficient in a blade-packing rotating packed bed with baffles was about 56% higher than that in a blade-packing rotating packed bed.
Based on the experimental results, correlations for pressure drop and mass transfer coefficient were developed. The correlation of KGa including Henry’s law constant into could reasonably predict the overall volumetric gas-side mass transfer coefficient under different operation conditions.

並列關鍵字

Absorption ； Rotating Packed Bed ； Pressure Drop ； Mass Transfer ； Blade ； Baffles

參考文獻

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