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Electrohydrodynamically enhanced mass transfer in a wetted-wall column
Chemical Engineering Research and Design ( IF 3.9 ) Pub Date : 2021-01-15 , DOI: 10.1016/j.cherd.2021.01.006
Christian Bacher , Ulrich Riebel

Intensified heat and mass transfer due to electrohydrodynamically (EHD) induced turbulence in wet electrostatic precipitators allows for versatile new opportunities and applications in the process industry. In order to demonstrate its feasibility and provide primary experimental data, a combination of a wetted- wall column and an electrostatic precipitator was tested experimentally. This investigation includes the variation over a multitude of different operating and design parameters, such as the magnitude and polarity of operating voltage, shape of the discharge electrode, flow velocity and flow configuration, i.e. counter-current vs. parallel flow. The results are presented as mass transfer coefficients, determined by measuring concentration changes of two different substance systems, i.e. the evaporation of water in air and the absorption of vaporized acetic acid in a highly alkaline aqueous solution.

The study has shown that mass transfer can be enhanced significantly by EHD effects in the gas phase. The enhancement factor ranges between three to eight, depending on the operating conditions and the choice of discharge electrode design. These findings are complemented by a feasibility assessment based on the energy consumption, showing that this technique will work best when using non-symmetrical discharge electrode designs.



中文翻译:

湿壁塔中电流体动力学增强的传质

湿式静电除尘器中由于电液动力学(EHD)引起的湍流而导致的传热和传质加剧,为加工行业带来了新的机遇和应用。为了证明其可行性并提供主要的实验数据,对湿壁塔和静电除尘器的组合进行了实验测试。该研究包括许多不同的运行和设计参数的变化,例如工作电压的大小和极性,放电电极的形状,流速和流动配置,即逆流与平行流的关系。结果表示为传质系数,通过测量两种不同物质系统的浓度变化确定,即

研究表明,气相中的EHD效应可以显着增强传质。取决于操作条件和放电电极设计的选择,增强因子的范围在三到八之间。这些发现得到了基于能耗的可行性评估的补充,表明该技术在使用非对称放电电极设计时效果最佳。

更新日期:2021-02-02
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