结合超声雾化技术的液体除湿系统分析

来源期刊:中南大学学报(自然科学版)2011年第1期

论文作者:王俐 连之伟 刘蔚巍

文章页码:240 - 246

关键词:液体除湿;超声波;雾化;液气比;沉降

Key words:liquid-desiccant dehumidification; ultrasound; atomization; liquid-air ratio; settlement

摘    要:对传统的填料塔式除湿方式进行改进,引入超声雾化技术,建立数学模型,对此新系统所需雾化量进行计算;对除湿过程中的颗粒沉降过程进行数学分析,得出气液混合管道中粒径、管径、管长的组合原理;对除雾器进行选择,使其能同时满足除雾和低压降的要求;分析此系统与其他液体除湿系统相比所具有的优点。研究结果表明:结合超声雾化技术的液体除湿系统达到同样的除湿效果,液气比(即液体与气体的质量比)大大降低,是Fumo填料塔式实验中液气比的1/5;推荐气液混合管道的长度为2~4 m,雾化颗粒粒径为20 μm左右;除雾器推荐选用丝网除沫器;与填料塔式相比,相同的除湿剂通过雾化作用产生的反应表面积是填料式的几十到几百倍,减少了除湿剂用量,降低了动力消耗;与喷淋塔相比,超声雾化方式能够产生粒径和初始速度都很小的优质液滴,同时,能够有效保证空气的除湿反应时间。

Abstract: Packed-bed dehumidification was improved by introducing ultrasound atomization technology. The structure diagram was given. Mathematical model was established to analyse the required quantity of atomized liquid-desiccant. Settlement process of liquid droplets was also mathematically analyzed to get the combination principle and some simple combination patterns of droplet size, pipe diameter and pipe length. Appropriate mist eliminator was considered. The results show that the liquid-air ratio is much lower than that of other dehumidification forms, the length of the air-liquid mixing pipe commended to be 2-4 m, the appropriate droplet diameter is 20 μm, the mesh mist eliminator is chosen for its good effect and lower pressure drop. Compared with packed-bed form, the ultrasound-atomization combined form can produce much more reacting area with the same quantity of liquid-desiccant. Compared with the spray-tower form, this new combined form can produce fine and minimal liquid droplet coming out with much low velocity, which ensures the dehumidifying time.

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