雾化溶液除湿系统最适液滴特性

doi:10.16085/j.issn.1000-6613.2019-1898

摘要/Abstract

摘要：

液滴特性是影响雾化溶液除湿系统性能的关键因素，但目前适用于该类除湿系统的最佳液滴特性尚不明确。为此，本文基于雾化溶液除湿过程所遵循的质量、能量平衡，借助数值模拟及正交设计，以超声波雾化溶液除湿系统（UADS）为例，对除湿剂液滴在各典型粒径、温度、质量分数等特性组合下的除湿性能进行研究。结果表明：随着液滴粒径的减小、溶液质量分数的增加以及液滴温度的降低，雾化除湿系统性能虽均有所提升，但其改善作用依次减弱；通过正交设计优化液滴特性组合，可显著提升雾化除湿系统性能。与液滴优化前相比，UADS系统在本文所得最适液滴特性下的性能，比传统典型性能（除湿速率为7.5g/s，除湿效率为48.5%）大幅提升，除湿速率提升31.04%，除湿效率改善达24.63%。研究可为雾化溶液除湿系统液滴特性的合理优选，并进一步提高系统的除湿性能及经济性提供积极参考。

关键词: 吸收, 数值模拟, 传质, 除湿液滴, 雾化

Abstract:

The characteristics of droplet are the critical parameters to the performance of the atomized solution dehumidification system. However, the characteristics of droplet associated to the best system performance are still unclear. Hence, this study studied the dehumidification performance under the various combination of sizes, temperatures, and mass fractions of the desiccant droplets in the ultrasonic atomization liquid desiccant dehumidification system (UADS). The numerical simulations and orthogonal tests were carried out based on the balance of energy and mass in the dehumidification process. It revealed that the dehumidification performance could be improved with the smaller size, the higher mass fraction, and the lower temperature of the desiccant droplets, however, their improvement effect was weakened in turn. By optimizing the droplet property combinations, the dehumidification performance of the system was significantly improved through orthogonal design, which was carried out based on the optimal combination of droplet characteristics. In this study, the moisture removal rate (MRR) and dehumidification effectiveness (DE) of the UADS were improved with 31.04% and 24.63% , respectively, comparing to the performance of the UADS before the optimization (MRR is 7.5g/s, DE is 48.5%). This study could provide a guidance for the selection of droplet properties in the atomizing liquid desiccant system, and improve the dehumidification and economic performance.

Key words: absorption, numerical simulation, mass transfer, desiccant droplet, atomization

中图分类号:

TU834.9

余旭芸, 杨自力, 龚斐然, 郜彩云. 雾化溶液除湿系统最适液滴特性[J]. 化工进展, 2020, 39(9): 3574-3582.

Xuyun YU, Zili YANG, Feiran GONG, Caiyun GAO. Optimal droplet properties for atomization liquid desiccant dehumidification system[J]. Chemical Industry and Engineering Progress, 2020, 39(9): 3574-3582.

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