| 摘要: |
| 电渗再生固体除湿剂具有节能、系统简单等优点，得到了越来越多的关注。本文利用比表面及孔隙度分析仪测试了沸石、大孔硅胶两种常用固体除湿剂的吸附性能；分析了其吸附机理和利用电渗再生的可能性。沸石吸附时属于单层吸附或多孔填充，水分以分子态存在于沸石微孔内，无法形成电渗效应；大孔硅胶吸附时，发生毛细凝结，吸附饱和时存在液态水，存在通过电渗效应再生的可能性。通过实验得到了沸石30V时存在电渗效应的临界含水率在40%~55%之间，高于其饱和含水率，初步验证了沸石在非饱和时不存在电渗效应。大孔硅胶95%含水率、60V电压时不存在电渗效应，105%含水率40V、50V、60V电压时存在电渗效应，同时在非饱和时可以通过电渗效应降低其本身的含水率。 |
| 关键词: 固体除湿剂 电渗 再生 吸附 |
| DOI： |
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| 基金项目:国家自然科学基金(51176199)资助项目。 |
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| Investigation on the Adsorption Mechanism and Electro-osmosis Regeneration of Common Solid Desiccants |
| Zhang Guiying,Shao Shuangquan,Lou Xiangming,Tian Changqing |
| (Technical Institute of Physics and Chemistry of CAS;University of Chinese Academy of Sciences;Hangzhou WAHAHA Group Co., Ltd.) |
| Abstract: |
| Regeneration of solid desiccants by electro-osmostic effect caught more and more attentions due to its energy saving and simplicity. The surface area and pore size analyzer was used to test the adsorption performance of the zeolite and the macroporous silica gel firstly. The possibility of electro-osmosis regeneration for the zeolite and the macroporous silica gel has been analyzed combined with different desiccants adsorption and electro-osmosis effect. The adsorption mechanism of the zeolite is monolayer adsorption or porous filler. The water exists in the micro pore of the zeolite in molecular state, thus it can’t form electro-osmosis effect. Capillary condensation happens for macroporous silica gel. The liquid water exists when it is saturated, so it is possible for macroporous silica gel to be regenerated by the electro-osmosis effect. The experiment results show the critical moisture content existing electro-osmosis effect of zeolite is between 40%~55% when the voltage is 30V which is higher than its saturated moisture content. This result verifies that there is no electro-osmosis effect for the zeolite when it is unsaturated. As for the macroporous silica, there is no electro-osmosis effect when the moisture content is 95% and the voltage is 60V. And electro-osmosis effect exists for 105% moisture content and 40V, 50V and 60V voltage. Electro-osmosis effect can reduce the moisture content of the macroporous silica gel when it is unsaturated. |
| Key words: solid desiccant electro-osmostic regeneration adsorption |
