Measurement and analysis of physical properties of mixed liquid desiccants based on calcium chloride solution

doi:10.11949/j.issn.0438-1157.20160050

Abstract

Abstract:

In order to improve the performance of the single desiccant solution and reduce the cost, the study of mixed liquid desiccants has been conducted by many researchers. Taking into account the low cost and weak dehumidification performance and for the sake of improving dehumidification performance of calcium chloride solution, adding lithium chloride or lithium bromide into frequently-used calcium chloride solution is considered in this paper. The solubility limit is explored by measuring the mass concentration of saturated mixed liquid of calcium chloride and lithium chloride or lithium bromide. Afterwards, the viscosity and surface tension of the mixed desiccants of lithium chloride and calcium chloride are measured. Through the experimental data of solubility, it is found that the saturated concentration of mixed liquid desiccants promotes up to 8% compared with saturated calcium chloride solution. The viscosity and surface tension of different mixing ratio of calcium chloride and lithium chloride solution show the lowest value at 1:1 mass ratio.

Key words: mixtures, viscosity, solubility, interfacial tension

摘要：

为了改善单一除湿盐溶液的性能，同时降低耗费成本，越来越多的学者致力于混合除湿盐溶液的研究。考虑以价格低廉但除湿效果一般的氯化钙溶液为基础溶液，添加氯化锂或溴化锂颗粒形成混合溶液来提高单一氯化钙溶液的除湿能力。测量了单一氯化钙溶液，加LiCl/LiBr颗粒后饱和混合溶液的质量浓度，探究极限溶解度，其次对氯化钙、氯化锂不同配比混合溶液在不同温度下的黏度及表面张力进行了测量。通过溶解度的实验测量，发现已经饱和的氯化钙溶液中还可继续溶解最高达8%的LiCl/LiBr晶体。测量得不同配比氯化锂、氯化钙混合溶液的黏度与表面张力值，通过比较发现氯化锂与氯化钙1：1的质量比下，混合溶液的黏度与表面张力均最低。

关键词: 混合物, 黏度, 溶解性, 界面张力

CLC Number:

TB61

SHEN Zijing, YIN Yonggao, ZHANG Xiaosong. Measurement and analysis of physical properties of mixed liquid desiccants based on calcium chloride solution[J]. CIESC Journal, 2016, 67(7): 3004-3009.

沈子婧, 殷勇高, 张小松. 基于氯化钙溶液的混合盐溶液除湿剂物性测量[J]. 化工学报, 2016, 67(7): 3004-3009.

References 18

[1]	徐学利, 张立志, 朱冬生. 液体除湿研究与进展[J]. 暖通空调, 2004, 34(7): 22-26. XU X L, ZHANG L Z, ZHU D S. Progress of liquid dehumidification [J]. HV&AC, 2004, 34(7): 22-26.
[2]	张杰, 耿欣, 白旭东. 空调系统溶液除湿基本问题的研究进展[J]. 节能, 2012, 12: 14-17. ZHANG J, GENG X, BAI X D. The basic problem of liquid desiccant [J]. Energy Conservation, 2012, 12: 14-17.
[3]	彭汉明, 杨敏林, 秦贯丰, 等. 含液体除湿技术的分布式能源系统[J]. 节能技术, 2011, 29(4): 319-322. PENG H M, YANG M L, QIN G F, et al. The liquid dehumidification technology in distributed energy systems [J]. Energy Conservation Technology, 2011, 29(4): 319-322.
[4]	高文忠, 时亚茹, 韩笑生, 等. 混合除湿盐溶液液滴闪蒸机理[J]. 化工学报, 2012, 63(11): 3453-3459. DOI: 10.11949/j.issn. 0438-1157.201511011. GAO W Z, SHI Y R, HAN X S, et al. Droplet flash evaporation of mixed dehumidification solutions [J]. CIESC Journal, 2012, 63(11): 3453-3459.
[5]	丁涛, 黄之栋, 赵伟金, 等. 太阳能除湿系统中混合盐溶液的除湿/再生效率[J]. 农业工程学报, 2010, 26(2): 295-299. DING T, HUANG Z D, ZHAO W J, et al. Dehumidification and regeneration efficiency of the mixed salt solution in the solar dehumidification system [J]. Transactions of the Chinese Society of Agricultural Engineering, 2010, 26(2): 295-299.
[6]	徐惠斌, 宋新南, 葛凤华, 等. 常见液体除湿剂池内核态沸腾换热特性[J]. 化工学报, 2013, 64(4): 1211-1216. XU H B, SONG X N, GE F H, et al. Pool nucleate boiling heat transfer of conventional desiccant solutions [J]. CIESC Journal, 2013, 64(4): 1211-1216.
[7]	ERTAS A, ANDERSON E E, KIRIS I. Properties of a new liquid desiccant solution-lithium chloride and calcium-chloride mixture [J]. Solar Energy, 1992, 49(3): 205-212.
[8]	孙健, 施明恒. 太阳能液体除湿空调系统性能参数的研究[J]. 流体机械, 2007, 35(7): 61-66. SUN J, SHI M H. Study on coefficient of performance of solar liquid desiccant air-conditioning system [J]. Fluid Machinery, 2007, 35(7): 61-66.
[9]	杜强, 刘韫刚. 热湿地区溶液除湿系统处理空调新风的实验研究[J]. 暖通空调, 2008, 38(7): 102-105. DU Q, LIU Y G. Experiment of liquid desiccant dehumidification system for fresh air handling in hot and humid area [J]. HV&AC, 2008, 38(7): 102-105.
[10]	LI X W, ZHANG X S, WANG G, et al. Research on ratio selection of a mixed liquid desiccant: mixed LiCl-CaCl2 solution [J]. Solar Energy, 2008, 82: 1161-1171.
[11]	宫小龙, 孙健, 施明恒, 等. 除湿溶液除湿性能的对比实验研究[J]. 制冷与空调, 2005, 5(5): 81-84. GONG X L, SUN J, SHI M H, et al. Contrast experimental study on performance of desiccation of desiccants solution[J]. Refrigeration and Air-conditioning, 2005, 5(5): 81-84.
[12]	李春林, 张鹤飞, 吴安民, 等. 基于武器保障的液体除湿系统性能实验研究[J]. 弹箭与制导学报, 2006, 26(1): 960-962. LI C L, ZHANG H F, WU A M, et al. An experimental study of liquid dehumidification system capability based on weapon indemnitee[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2006, 26(1): 960-962.
[13]	杨英, 李心钢, 李惟毅, 等. 液体除湿特性的实验研究[J]. 太阳能学报, 2000, 21(2): 155-159. YANG Y, LI X G, LI W Y, et al. Experimental study on the characteristics of solar powered liquid dehumidification system[J]. Acta Energiae Solaris Sinica, 2000, 21(2): 155-159
[14]	易晓勤. 常用溶液除湿剂的性质研究[D]. 北京: 北京大学, 2009. YI X Q. Study on the characteristics of conventional liquid desiccants [D]. Beijing: Beijing University, 2009.
[15]	钟炳. 液体混合物的黏度方程[J]. 化工学报, 1980, 31(1): 19-26. ZHONG B. The viscosity equation of liquid mixtures [J]. Journal of Chemical Industry and Engineering(China), 1980, 31(1): 19-26.
[16]	耿皎, 洪梅, 詹勤礼, 等. 不锈钢填料表面处理前后的性能[J]. 高校化学工程学报, 2000, 14(4): 382-386. GENG J, HONG M, ZHAN X L, et al. Investigation of the performances before and after surface treatment of stainless steel packings[J].Journal of Chemical Engineering of Chinese Universities, 2000, 14(4): 382-386.
[17]	MANUEL R C. Properties of aqueous solutions of lithium and calcium chlorides: formulations for use in air conditioning equipment design [J]. International Journal of Thermal Sciences, 2004, 43: 367-382.
[18]	ZHANG H S, YUAN X G, KALBASSI M A. Influence of surface tension on residence time in structured packing [J]. Chemical Engineering, 2015, 43(7): 12-15.