A dual-scale analysis of mass transfer enhancement in liquid desiccant system for indoor VOCs removal by adding surfactant
A dual-scale analysis of mass transfer enhancement in liquid desiccant system for indoor VOCs removal by adding surfactant
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DOI：
10.1016/j.enbuild.2022.112374
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发表时间：
2022-08-18
影响因子：
6.7
通讯作者：
Wang, Xingyu
中科院分区：
文献类型：
--
作者：
Hu, Jiachun;Fu, Huangxi;Wang, Xingyu
室内挥发性有机化合物（VOCs）污染控制是人类健康发展面临的重大挑战。液体除湿有望成为一种潜在的VOCs去除方法。然而，在液体干燥剂（LD）体系中，某些疏水性voc的传质能力较差，导致其去除率较低。因此，本研究提出双尺度视角来促进VOCs迁移。包括溶液界面VOCs转移的微观材料特性和LD系统热-湿-VOCs转移的宏观系统模型。微观和宏观子视角通过关键信息交换相结合。此外，从双尺度的角度出发，首次将表面活性剂引入到LD体系中，促进VOCs的转移。表面活性剂能有效提高疏水VOCs在LD中的溶解度，增强其在溶液界面的传质。通过实验和仿真，研究了考虑空气除湿要求的材料微观特性和宏观工作参数对VOCs传递特性的影响。利用所提出的双尺度视角，设计了一种新的LD。因此，微界面和宏观系统的VOCs转移能力分别提高了19.24%和16.67%。研究发现，材料的微观性能和宏观工作参数共同决定了材料转移能力的增强。该方法在一定程度上实现了“微观界面-宏观系统”的双尺度协同设计。采用该方法对LD系统中VOCs迁移特性进行整体分析是可行的。(c) 2022 Elsevier B.V.版权所有
Indoor volatile organic compounds (VOCs) pollution control is a major challenge facing the healthy devel-opment of people. Liquid dehumidification is expected to be a potential way for VOCs removal. However, the poor mass transfer ability for some hydrophobic VOCs in liquid desiccant (LD) system results in a lower removal performance. Therefore, a dual-scale perspective is proposed to enhance VOCs transfer in this study. It includes micro material property for VOCs transfer at solution interface, and macro sys-tem model for heat-moisture-VOCs transfer in LD system. The micro and macro sub-perspectives are combined via key information exchange. Moreover, surfactant is firstly introduced into LD system to enhance VOCs transfer from dual-scale perspective. The surfactant can effectively improve the solubility of hydrophobic VOCs in LD and enhance their mass transfer at solution interface. Through experiment and simulation, the influences of micro material properties and macro working parameters on VOCs transfer characteristic are investigated considering air dehumidification requirements. Using the pro-posed dual-scale perspective, a new LD is designed. Thus, the VOCs transfer ability at micro interface and macro system are improved by 19.24% and 16.67%, respectively. It is found that the enhanced VOCs transfer ability is co-determined by micro material properties and macro working parameters. In a way, the proposed approach can realize the dual-scale co-design from "micro interface -macro system". Entirety analysis of the VOCs transfer characteristics in LD system is feasible with this methodology. (c) 2022 Elsevier B.V. All rights reserved.