低温余热驱动的工业除湿系统性能研究  

Performance Study of a Liquid Desiccant Dehumidification System Driven by Low-temperature Heat for Industrial Application

作　　者：苏博生 韩巍[1,2] 徐聪 隋军[1,2] SU Bo-Sheng HAN Wei XU Cong SUI Jun(Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing Key Laboratory of Distributed CCHP System, Beijing 100190, China University of Chinese Academy of Sciences, Beijing 100190, China)

机构地区：[1]中国科学院工程热物理研究所,分布式冷热电联供系统北京市重点实验室,北京100190 [2]中国科学院大学,北京100190

出　　处：《工程热物理学报》2017年第10期2054-2060,共7页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划(973计划)(No.2014CB249202);国家自然科学基金(No.51576191)

摘　　要：针对传统冷凝除湿方法耗电量大的问题,提出一种利用低温余热的双级溶液除湿系统,余热的高温部分通过再生器将稀溶液转换成浓溶液,余热的低温部分驱动单效吸收式制冷机制冷,实现了余热的梯级利用。浓溶液在第一级除湿器完成空气的初步除湿,中间浓溶液经过吸收式制冷机降温提高吸收能力后,进入第二级除湿器对初步除湿的空气进行深度除湿。新系统与冷凝除湿系统相比,相对节电率达到96.17%,余热折合发电效率达到6.94%。通过研究双级除湿过程驱动力的匹配,发现除湿过程除湿工质与湿空气之间的表面水蒸气分压力更加匹配,除湿过程平均水蒸气分压力差比冷凝除湿过程减少20%以上。本研究提供了一种利用低温余热实现空气深度除湿的新型除湿系统流程与方案。Cooling dehumidification technology is widely applied in the industrial applications,however, such system usually consumes large amount of electricity. A two-stage liquid desiccant dehumidification system driven by surplus heat is proposed. The surplus heat is used in a cascade way. The high-temperature portion of heat is used to convert weak LiCl-H_2 O solution to strong solution. The low-temperature portion of heat is used to drive a single-effect absorption refrigerator to generate cooling energy. The strong LiCl solution first achieves the preliminary dehumidification in the first dehumidifier, and then the output solution is cooled by the absorption refrigerator to improve its moisture absorption ability, then the cooled salt solution achieves the depth dehumidification of air. Comparing with the conventional cooling dehumidification system, the power consumption reduced by 96.17% and the ratio of the saving electricity to the total heat input can reach 6.94%.By investigating the match of driven force in the dehumidifiers, the average vapor pressure difference between the air and the salt solution was reduced by at least 20%. This study may provide a new air dehumidification system to utilize the surplus heat efficiently.

关 键 词：余热利用 溶液除湿 节电性 工业应用 水蒸气分压力 

分 类 号：TU831.5[建筑科学—供热、供燃气、通风及空调工程]