Abstract:

To compare the difference of drying performance and mass transfer ability between LiCl and LiBr solution used in the compressed air drying system, the experiments were performed using LiCl and LiBr solution, respectively. The drying performance was compared on the basis of the same solution temperature and surface vapor pressure. The mass transfer coefficients between compressed air and LiCl liquid desiccant were calculated based on the heat and mass transfer model. The results indicated that the humidity ratio of air using LiCl liquid desiccant was lower and the moisture removal rate was higher than LiBr in the same experimental operating conditions, while the mass transfer coefficients between compressed air and LiCl liquid desiccant were higher than LiBr. It was concluded that using LiCl liquid desiccant can obtain better drying performance and mass transfer ability in compressed air drying system.

Key words: compressed air, liquid desiccant, moisture removal rate, drying performance, mass transfer

摘要：

在压缩空气溶液除湿实验平台上，分别以LiBr和LiCl水溶液作为除湿剂，实验研究了两种溶液在压缩空气溶液除湿系统中的除湿性能。以溶液表面水蒸气分压力作为比较基准，压缩空气出口含湿量和除湿量作为除湿性能的评价指标，对二者的除湿能力进行比较分析。同时基于压缩空气溶液除湿器传热传质模型，结合实验数据，研究了LiBr、LiCl溶液与压缩空气间的传质系数大小以及变化规律。结果表明：在相同的处理工况下，采用LiCl溶液对压缩空气进行除湿能得到更低的空气出口含湿量和更高的除湿量，LiCl溶液除湿过程的传质系数也高于LiBr溶液，即在压缩空气溶液除湿系统中LiCl溶液具有更优的除湿能力和传质性能。

关键词: 压缩空气, 溶液除湿, 除湿量, 除湿性能, 传质