NH_3-H_2O-LiBr三元溶液特性的理论和实验研究  

Theoretical and Experimental Researches on the Solution Characteristics of NH_3-H_2O-LiBr Ternary Solution

作　　者：何树青[1] 吴铁晖[1] 吴裕远[1] 王晶[1] 尹璐[2] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]辽宁师范大学文学院,大连116029

出　　处：《上海交通大学学报》2009年第10期1609-1611,共3页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50776064)

摘　　要：采用溶剂化作用模型,理论计算分析了LiBr对NH3-H2O-LiBr三元溶液组成的影响,并进行了实验.理论计算结果表明:LiBr电离后的离子,经溶剂化作用,吸引NH3和H2O形成离子簇,使得溶液中自由NH3和H2O减少,使同温度下的平衡蒸气压力降低;在溶液中LiBr初始质量分数低于0.23时,离子簇吸引NH3多于H2O,但高于此浓度时则吸引H2O多于NH3.实验结果表明,蒸气压力并不随wLiBr升高而一直降低,高wLiBr(0.42)的蒸气压力反而比低wLiBr(0.21)的值要高,与溶液理论计算分析结果相吻合.Solution characteristics of NH3-H2O-LiBr ternary solution influenced by different LiBr concentration were calculated theoretically by solvation model and the experiments were carried on. The calculation results show that the ions after ionization of LiBr are coated by NH3 and H2O, forming ionic clusters which can be considered as new components, thereby the vapor pressure is decreased. The ion clusters would arrest more NH3 than H2O while the original mass concentration of LiBr is under 0.23, and would arrest more H2O than NH3 when the concentration surpasses 0.23. The experimental results show that the vapor pressure wouldn＇t decrease all the time when the original mass concentration of LiBr is increasing, the values of experimental vapor pressure are higher when the original mass concentration of LiBr is 0.42 than that when it is 0.21, which matches up with the calculation results well.

关 键 词：吸收式制冷系统 溶剂化作用 NH3-H2O-LiBr溶液 离子簇 理论计算 实验 

分 类 号：TB651[一般工业技术—制冷工程]