NH3-H2O-LiBr吸收式制冷系统的可行性研究

针对目前氨水吸收式制冷系统的缺点由于高压侧(发生器和冷凝器)的工作压力过高带来的不安全隐患以及发生出来的气体中还有较多的水蒸汽而带来的系统过于庞大等问题,提出了相应的改进方案,在氨水系统中加入溴化锂,期望能够降低其工作压力以及气相中水蒸汽的含量。为了对该三元混合工质的可行性进行研究,在自行搭建的实验平台上,对其压力及温度进行了测试,测试温度范围从20℃到90℃,压力最高到2MPa,测试用溴化锂质量浓度范围从5%到60%。实验结果表明,与相同浓度下的氨水溶液相比,三元溶液的气液平衡压力降低了近30%～50%,气相中水蒸汽的含量最低可降到2.5%。实验结果为工业上的推广使用提供了理论依据。

Feasibility Research on NH3-H2O-LiBr Absorption Refrigeration System

This paper offer an improving method on the disadvantage of ammonia-water absorption refrigeration system: High work pressure brings out some insecurity hide trouble and huge system. The method is that LiBr is added in ammonia-water system to make the work pressure falling. In order to study the feasibility of these work pairs, the equilibrium cell were used to measure thermal property of ternary ammonia-water-lithium bromide mixtures on experiment cell built by self. New pressure-temperature vapor liquid equilibrium (VLE) data were obtained for the ammonia-water-lithium bromide ternary solution at ten temperature points between 20 and 90℃, and pressures up to 2 MPa. The salt concentration of the solution was chosen in the range of 5-60% mass ratio of LiBr in pure water. The VLE is measured statically. The experimental results show that the equilibrium pressures would be reduced: 30～50%, and the amount of component of water in gas phase would be reduced greatly also: 2.5%. The experimental results suggest that it is accorded with expectation and offer the theory evidence for industry application.