吸收—喷射复合式高温热泵系统模型与性能分析

Model and Performance Analysis of a Hybrid Absorption-ejector Heat Pump System at High Temperature

本研究提出一种吸收-喷射复合式高温热泵,可将工业生产中普遍存在的湿热废气转换为0.3-0.4 MPa的蒸汽回用于生产。在热力学分析的基础上,利用Engineering Equation Solver软件对该新型热泵系统建立了数学模型,并对其性能进行模拟分析。结果表明:在参考工况下,系统可以输出0.4 MPa的工艺蒸汽,COP(系统性能系数)可达到1.32;湿热废气热量回收率大于60%,且提温幅度大于70℃,COP随废热源温度、相对湿度、吸收器进口溶液浓度、新蒸汽压力及喷射系数的增高而上升;随液气比、一效发生比的增加而下降。

A hybrid absorption-ejector heat pump at high temperature is presented in this paper,which can convert humid hot exhaust gas into 0. 3- 0. 4 MPa work steam and reuse it in industrial production processes. The corresponding mathematical model was established upon thermodynamic analysis and using Engineering Equation Solver program. Results show under referenced operating conditions,0. 4 MPa steam can be generated and coefficient of performance( COP) can reach 1. 32. The heat recovery efficiency is greater than 60%,and the increase in temperature exceeds 70 ℃. Furthermore,system COP increases with the increases in exhaust gas relative humidity and temperature,absorber inlet solution concentration and entrainment ratio,and decreases with the increase in liquid-gas ratio and the primary generator ratio.