基于吸收式制冷循环的CaCl2-LiCl/H2O工质对研究  

Study on CaCl2-LiCl/H2O as working pair of absorption refrigeration cycle

作　　者：李艺群 罗春欢 李娜[1,3] 苏庆泉 LI Yiqun;LUO Chunhuan;LI Na;SU Qingquan(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Engineering Research Center for Energy Saving and Environmental Protection,University of Science and Technology Beijing,Beijing 100083,China;State Grid Energy Conservation Service Co.,Ltd.,Beijing 100083,China)

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]北京科技大学节能与环保北京高校工程研究中心,北京100083 [3]国网节能服务有限公司,北京100083

出　　处：《化工学报》2019年第9期3483-3494,共12页CIESC Journal

基　　金：国家重点研发计划项目(2016YFC0400408)

摘　　要：利用低品位的太阳能热、地热或者工业领域低温余热废热进行吸收式制冷是实现节能减排的一个有效途径。对具有良好制冷吸收特性的工质对CaCl2-LiCl/H2O进行了实验研究,通过测定不同质量比的CaCl2-LiCl/H2O溶液的饱和蒸气压,得出了CaCl2与LiCl的质量比为2∶1的工质对即CaCl2-LiCl(2∶1)/H2O的制冷吸收特性最佳。CaCl2-LiCl(2∶1)/H2O与常规的工质对LiBr/H2O相比,在大幅降低工质对成本的同时,在同一制冷工况下所需驱动热源温度即发生温度降低了5.8℃,而制冷COP提高0.041,?效率提高0.052。还系统测定了CaCl2-LiCl(2∶1)/H2O的结晶温度、密度、黏度、比热容、比焓以及腐蚀性。结果表明,相较于其他几种以CaCl2为主要成分的工质对,CaCl2-LiCl(2∶1)/H2O具有较低的黏性,且对碳钢和紫铜的腐蚀性也较小,可满足实际工程应用的要求。Absorption refrigeration using low-grade solar heat,geothermal heat or industrial waste heat as driving heat source is an effective way to achieve energy saving and emission reduction.A new working pair of CaCl2-LiCl/H2O,which has an excellent refrigeration absorption characteristic,was studied by measuring its crystallization temperature and vapor pressure with different mass ratios of CaCl2∶LiCl.The results showed that CaCl2-LiCl(2∶1)/H2O with a mass ratio of 2∶1 was the most suitable working pair for an absorption refrigeration system.Compared with LiBr/H2O,under the same refrigeration conditions,the required driving heat source temperature,that is,the required generation temperature for CaCl2-LiCl(2∶1)/H2O was 5.8℃lower,COP and exergy efficiency for CaCl2-LiCl(2∶1)/H2O were 0.041 and 0.052 higher,respectively.Furthermore,the cost of working pair was greatly reduced.In addition,the crystallization temperature,saturated vapor pressure,density,viscosity,specific heat capacity,specific enthalpy,and corrosivity of CaCl2-LiCl(2∶1)/H2O were measured systematically.Compared with other working pairs using CaCl2 as the main component, CaCl2-LiCl(2∶1)/H2O had a relatively low viscosityand low corrosion rates for carbon steel and copper, so it could meet the requirements of practical engineeringapplication.

关 键 词：吸收式制冷 制冷吸收特性 工质对 结晶 黏度 腐蚀 

分 类 号：TB61.6[一般工业技术—制冷工程]