Modeling and performance investigation on the counter-flow ultrasonic atomization liquid desiccant regenerator
Modeling and performance investigation on the counter-flow ultrasonic atomization liquid desiccant regenerator
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逆流超声雾化液体干燥剂再生器建模及性能研究
DOI：
10.1016/j.applthermaleng.2019.114573
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发表时间：
2020-01
影响因子：
6.4
通讯作者：
Hu Yixiong
中科院分区：
文献类型：
--
作者：
Yao Ye;Li Wei;Hu Yixiong
液体干燥剂再生器作为液体干燥剂除湿系统的关键部件，对整个系统的性能产生很大的影响。本文研究了逆流式超声雾化液体干燥剂再生器。首先，建立了再生器的数学模型，并利用有限差分法进行了实验验证。本文提出了除湿率和再生热效率两个性能指标来评价逆流再生器的性能，并通过建立的模型研究了入口参数对逆流再生器再生性能的影响。减小空气与溶液之间的温差并增大湿度差可以提高再生性能。随着空气和溶液温度的升高，再生效率提高，但能量损失也增大。再生效率随着溶液浓度的增加而降低。再生效率随着气液比的增加呈非线性增加。最后，存在最佳再生性能的最佳液滴尺寸。与并流配置相比，逆流配置具有更好的再生性能，这归因于传湿驱动力分布更均匀以及液滴在再生器中的停留时间更长。该研究有助于逆流超声雾化液体干燥剂再生器的发展和更好的应用。
As the key components in a liquid desiccant dehumidification system, liquid desiccant regenerator produces great effect on the whole system’s performance. This paper studies the counter-flow ultrasonic atomization liquid desiccant regenerator. Firstly, a mathematical model for the regenerator has been established and experimentally validated with finite difference method. Two performance indicators, i.e., the moisture removal rate and the regeneration thermal efficiency, were suggested to evaluate the performance of the counter-flow regenerator, and the influences of inlet parameters on the regeneration performance of the counter-flow regenerator have been investigated by the established model in this study. Decreasing temperature difference and increasing humidity difference between air and solution can improve regeneration performance. With the temperature of air and solution increasing, the regeneration efficiency increases, but the energy loss also increases. The regeneration efficiency decreases with the increase of solution concentration. The regeneration efficiency increases nonlinearly with the increase of gas-liquid ratio. Finally, there exists an optimum droplet size for the best regeneration performance. Compared with the parallel-flow configuration, the counter-flow has better regeneration performance, which is attributed to the more uniform distribution of moisture transfer driving force and the longer residence time of droplets in the regenerator. The study contributes to the development and the better applications of the counter-flow ultrasonic atomization liquid desiccant regenerator.
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