摘要
工业生产中存在大量的70~80℃的余热未被回收利用,如果利用热泵将这部分余热转化为高品质工业蒸汽则可大大降低工业能耗和污染物排放。本文研究一种回收废水余热制取蒸汽的高温热泵系统,在蒸发器侧水进出口温度80/70℃和冷凝器侧水进出口温度90/120℃设计工况下,针对该换热过程"大温差"和"高冷凝"的换热特点分析对比不同非共沸工质的循环性能。首先对比了多种二元混合工质的循环性能,得到性能较为优良的混合工质R124/R141b(0.45/0.55).为保证压缩机安全运行添加第三元组分以降低排气温度和压力,结果表明:三元工质R365mfc/R124/R141b(0.55/0.405/0.045)综合性能较佳,其COP达到4.9,并且单位容积制热量为4110 kJ/m^3,同时排气温度125℃和冷凝压力为1595 kPa,综合性能优越并满足压缩机安全运行要求。
There is a large amount of industrial waste heat from 70~80℃in industrial production.If this part of waste heat resources is converted into high quality industrial steam heat by heat pump,industrial energy consumption and pollutant discharge can be greatly reduced.This paper studies a high-temperature heat pump steam system that can be used to recover industrial waste heat to produce steam.Under the design conditions of evaporator side water inlet and outlet temperature 80/70℃and condenser side water inlet and outlet temperature 90/120℃,According to the heat transfer characteristics of the"large temperature difference"and"high condensation"of the heat exchange process,the cycle performance of different ternary non-azeotropic working fluids was compared.Firstly,the cycle performance of various binary mixed working fluids was compared,and the mixed working medium R124/R141b(0.45/0.55)with better performance was obtained.Add a third component to ensure safe operation of the compressor to reduce exhaust temperature and pressure.The results show that the ternary working fluid R365 mfc/R124/R141b(0.55/0.405/0.045)has the best comprehensive performance,and the COP reaches 4.9,the unit volume of heat is 4110 kJ/m^3,the exhaust temperature is 125℃,and the condensing pressure is only 1595 kPa,which is within the compressor pressure range.
作者
孙健
刘靖宇
戈志华
杨勇平
SUN Jian;LIU Jing-Yu;GE Zhi-Hua;YANG Yong-Ping(Energy Power and Mechanical Engineering College,North China Electric Power University,Beijing 102206,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第5期1043-1049,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51606061)
中央高校基本科研业务面上项目(No.2017MS010)。
关键词
高温热泵
三元工质
余热回收
混合工质
high temperature heat pump
ternary working fluid
waste heat recovery
mixture
