吸收式除濕系統除濕液中添加微量低表面張 力溶劑對質傳性能之影響

Effects of the Addition of a Small Amount of Low Surface Tension Solvent into the Working Solution of the Absorption Dehumidification Systems

李吉川(Chi-Chuan Li)

指導教授 ： 鍾財王

中原大學/工學院/化學工程研究所/碩士(2006年)

https://doi.org/10.6840/cycu200600337

摘要

添加低表面張力之揮發性有機溶液於在吸收式除濕系統工作溶液三乙基乙二醇以及LiCl水溶液中，強制氣-液界面形成表面張力梯度，因而產生表面流體之擾動現象，稱為Forced Marangoni convection。由於表面張力梯度對於氣-液間質傳性能具有決定性的影響，當系統產生Marangoni convection時，會增加界面擾動的程度，不但可以促進表面更新的效應，亦可帶動液面周圍的空氣，增加氣-液接觸的機會，進而促進質傳性能的提升。本實驗將以上原理應用於吸收式除濕系統當中，藉由在吸收劑內添加低表面張力之醇類，使系統產生Marangoni effect，用來提升除濕系統的效率，系統操作參數包括空氣與液體流量、液體溫度與濃度、進口空氣之溼度等。本實驗將比較不同操作條件下，有無添加醇類系統之除濕效率差異，以及三乙基乙二醇和LiCl溶液添加醇類之性能比較，藉以證明界面擾動現象對系統性能具不可忽略之影響，對建立考慮界面現象之氣-液質傳模式或吸收塔經驗式都具有重要意義。

關鍵字

表面張力、三乙基乙二醇、LiCl、Marangoni

並列摘要

Adding a low surface tension volatile organic solutions into working solutions of triethylene glycol (TEG) and LiCl solution in a dehumidification system, it will force to form the interfacial disturbance in the gas-liquid interface, which is called Forced Marangoni convection. The surface tension gradient dominates the mass transfer performance between gas-liquid interfaces. When the systems occurring the interface disturbance, it will increase the degree of instability and the rate of surface renewal and cause the flow of air on the liquid surface to increase the gas-liquid contact and its mass transfer performance. This theory will be applied in the absorption dehumidification system to increase the dehumidification efficiency by adding a small amount of low surface tension alcohol to occur the Marangoni effect. The operating parameters include air and liquid flow rate, liquid inlet temperature and concentration, and air inlet humidity. The experiment will find out the differences of the dehumidification efficiency in different operating parameters with and without adding alcohols comparison of the performance between TEG and LiCl solution systems with adding a small amount of alcohol. By using this method, we can prove that there is a great influence of interface disturbance on the systematic performance. It is an important meaning to set up gas-liquid interface mass transfer model or experience model of interfacial phenomenon in the absorption tower.

並列關鍵字

LiCl ； TEG ； Surface tension ； Marangoni ； Triethylene glycol

參考文獻

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