Determination of the effective interfacial area in blade-packing rotating packed bed with baffles

• Main Authors: Ching-Yi Tsai, 蔡靜誼
• Other Authors: Yu-Shao Chen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/95430794789795896925

碩士 === 中原大學 === 化學工程研究所 === 101 === In this works, we used chemical absorption of CO2 to measure the effective gas-liquid interfacial area (a) and used the stripping of dissolved oxygen to measure the volumetric liquid-side mass transfer coefficient (kLa) in blade packing rotating packed bed equipped with baffles. By substituting the overall volumetric gas-side mass transfer coefficient (KGa) from our previous work (Sung, 2011) and the experimental data from this study into the two-film theory, the volumetric gas-side mass transfer coefficient (kGa)、gas-side mass transfer coefficient (kG) and liquid-side mass transfer coefficient (kL) were obtained. The influence of operation conditions, such as gas flow rate, liquid flow rate, rotational speed, existence of baffles and packing types on mass transfer coefficients and effective gas-liquid interfacial area were investigated to figure out the reason for KGa enhancement in blade packing rotating packed bed equipped with baffles. From the results, the removal efficiency of carbon dioxide was proportional to the liquid flow rate and the rotational speed. Conversely, it decreased with the increasing of gas flow rate. In addition, it was possible to increase the removal efficiency by adding the baffles. According to the experimental results, the mass transfer characteristics of the blade-packing RPB with baffles are: (1) kLa and a were proportional to liquid flow rate and rotational speed, (2) kGa was proportional to gas flow rate, liquid flow rate and rotational speed, (3) kG was affected by gas flow rate obviously, but unrelated to rotational speed, (4) kL was proportional to liquid flow rate and rotational speed. Furthermore, it is found that adding stationary baffles will enhance both of the kG and a. Finally, based on the experimental results, correlations for kLa, kGa, kG, kL and a were developed. These correlations are valid under different operation conditions in blade packing rotating packed bed equipped with baffles.