溶液除湿中基于水蒸气压差的传质系数

doi:10.11949/j.issn.0438-1157.20150681

化工学报 ›› 2015, Vol. 66 ›› Issue (12): 4774-4779.DOI: 10.11949/j.issn.0438-1157.20150681

溶液除湿中基于水蒸气压差的传质系数

张润霞¹, 王赞社², 孟祥兆², 王芳², 刘丰榕², 顾兆林²

1 西安交通大学城市学院, 陕西西安 710018;
2 西安交通大学人居学院, 陕西西安 710049

收稿日期:2015-05-25 修回日期:2015-08-24 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 王赞社
基金资助:
国家自然科学基金项目(51478386);“十二五”国家科技支撑计划项目(2011BAJ03B06-1)。

Mass transfer coefficient for liquid dehumidification based on vapor pressure difference

ZHANG Runxia¹, WANG Zanshe², MENG Xiangzhao², WANG Fang², LIU Fengrong², GU Zhaolin²

1 City College, Xi'an Jiaotong University, Xi'an 710018, Shaanxi, China;
2 Human Settlements and Civil Engineering College, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

Received:2015-05-25 Revised:2015-08-24 Online:2015-12-05 Published:2015-12-05
Supported by:
supported by the National Natural Science Foundation of China (51478386) and the “12th-five” Program of the Ministry of Science and Technology (2011BAJ03B06-1).

摘要/Abstract

摘要：

分析了溶液除湿系统中气液界面间传质过程的影响因素,以气液界面间传质的直接驱动力——溶液表面蒸气压与湿空气中水蒸气分压差为基础,提出了以蒸气压差为变量的传质系数关联式,采用已公开发表的实验数据(LiCl溶液,纤维规整型填料)拟合获取关联式中常数项,得到除湿过程传质系数关联式。采用不同结构填料(LiCl溶液,PVC规整型填料)已公开发表的实验数据对该关联式进行验证,实验值与计算值相对偏差为-10.48%～5.28%。为进一步验证该关联式,搭建了热泵型溶液除湿系统(LiBr溶液,翅片管式热湿交换器),用获得的实验数据对得到的关联式进行验证,相对偏差为-1.8%～12.8%。3组实验值与计算值的对比表明,以蒸气压差为主要变量的传质系数关联式对规整型填料溶液除湿器传质系数的模拟计算具有较高的计算精度。

关键词: 传质, 传质系数关联式, 溶液除湿, 实验验证, 蒸气压差

Abstract:

The influencing factors for mass transfer of gas-liquid interface in liquid desiccant system are analyzed. A mass transfer correlation is given in dimensionless form based on the driving force of mass transfer, which is the vapor pressure difference through gas-liquid interface. The constants in the correlation are fitted based on published experimental data of LiCl-H₂O-air system in a column packed with cross corrugated cellulose. Another group of published experimental data of LiCl-H₂O-air system in a column packed with polyvinyl chloride is used for validating the correlation, with the relative deviation between experimental and calculated results from -10.48% to 5.28%. Moreover, a liquid dehumidification system driven by heat pump is set up, with LiBr-H₂O as desiccant and finned tube heat exchanger as packings, and the experimental data are used for validating the correlation. The result shows that the deviation is -1.8%-12.8%. All these results show that the correlation has a high accuracy for mass transfer coefficient prediction in liquid dehumidifier with structured packings.

Key words: mass transfer, mass transfer correlation, liquid desiccant, experimental validation, vapor pressure difference

中图分类号:

TK124

张润霞, 王赞社, 孟祥兆, 王芳, 刘丰榕, 顾兆林. 溶液除湿中基于水蒸气压差的传质系数[J]. 化工学报, 2015, 66(12): 4774-4779.

ZHANG Runxia, WANG Zanshe, MENG Xiangzhao, WANG Fang, LIU Fengrong, GU Zhaolin. Mass transfer coefficient for liquid dehumidification based on vapor pressure difference[J]. CIESC Journal, 2015, 66(12): 4774-4779.

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溶液除湿中基于水蒸气压差的传质系数

Mass transfer coefficient for liquid dehumidification based on vapor pressure difference

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