ANALYSIS OF EFFECT OF GAS–LIQUID INTERFACIAL DISTURBANCE ON MASS TRANSFER PERFORMANCE
ANALYSIS OF EFFECT OF GAS–LIQUID INTERFACIAL DISTURBANCE ON MASS TRANSFER PERFORMANCE
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DOI：
10.1142/s0218625x06008050
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发表时间：
2006-04
影响因子：
1.1
通讯作者：
H. Wu;T. Chung
中科院分区：
文献类型：
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作者：
H. Wu;T. Chung
为了研究水蒸气在三甘醇（TEG）溶液中的传质现象，阐明界面扰动对吸收性能的影响，对三甘醇溶液表面滴入水滴的界面现象及传质过程进行了观测和操作。在液相连续吸收系统中，除气液流量外，界面扰动也会影响传质性能，因此必须从物质的界面来探讨先进的传质现象。为此，通过测量干燥剂溶液的表面张力，分析了水滴滴入三甘醇溶液表面的扰动现象。由于马兰哥尼指数（MI）是指液层表面的最大表面张力差，MI的值进行了计算，并与填料床吸收器的传质性能进行了比较。一般来说，由于表面张力差引起的界面扰动会增大气液两相的接触面积。通过对三甘醇溶液表面滴入水滴的观察发现，水滴与三甘醇溶液之间存在界面扰动，水滴周边区域存在界面不稳定现象。另一方面，MI值随TEG浓度的增加而增加，并且可以推断，在较高浓度的TEG溶液中，表面张力效应应该是显著的，并且在95wt.%以上，界面扰动将更严重三甘醇溶液。最后，对95和96重量%的吸收性能进行了测试。TEG溶液比90和88.6wt.%填充床吸收塔运行中的三甘醇溶液。
In order to study the mass transfer phenomena for water vapor absorbed by triethylene glycol (TEG) solution and to elucidate effect of interfacial disturbance on absorption performance, the interfacial phenomena for water drop instilling on the surface of TEG solution and mass transfer process were observed and operated in this study. Besides liquid and gas flow rates, the interfacial disturbance can also affect the mass transfer performance in the absorption system with continuous liquid phase, and the advanced mass transfer phenomena must be discussed from the interface of matter. Therefore, the surface tensions of desiccant solutions were measured to analyze the disturbed phenomena of water drop instilling on the surface of TEG solution. Since the Marangoni-Index (MI) means the maximum surface tension difference on the surface of liquid layer, the values of MI were calculated and compared with the mass transfer performance of packed-bed absorber. Generally speaking, the interfacial disturbance, resulted from the surface tension difference, would promote the contacting area of gas and liquid phases. The observation of water drop instilling on surface of TEG solution found that the interfacial disturbance existed between water drop and TEG solution, and the interfacial instability was found in the peripheral region of the water drop. On the other hand, the values of MI were increased by the increased TEG concentrations, and it can be deduced that the surface tension effect should be significant in the higher concentration of TEG solution and the interfacial disturbance would be heavier above 95 wt.% TEG solutions. Finally, the absorption performance for 95 and 96 wt.% TEG solutions were much larger than that of 90 and 88.6 wt.% TEG solutions in the operation of packed-bed absorber.