CO_2跨临界热泵和加热炉冷却循环耦合系统性能分析  

Analysis of the Performance of a Transcritical Carbon Dioxide Heat Pump and Heater Cooling Cycle Coupled System

作　　者：王洪利[1] 刘建雄[1] 张岩[1] 陈杉[1] 

机构地区：[1]河北联合大学冶金与能源学院,河北唐山063009

出　　处：《热能动力工程》2013年第1期38-41,108,共4页Journal of Engineering for Thermal Energy and Power

基　　金：河北省高等学校科学技术研究重点基金资助项目(ZD2010105)

摘　　要：提出跨临界CO2热泵和朗肯循环耦合实现加热炉的余热回收。基于热力学研究方法,分别对影响耦合循环效率和CO2跨临界热泵性能的关键参数进行了研究。随着热泵性能COP的提高,耦合循环的效率提高。当热泵性能超过限定值后,压缩机耗功比值越大,耦合循环效率越低。排气压力范围内,热泵性能和耦合循环效率均有极值。给定条件下最优排气压力为8.5 MPa,热泵性能COP为4.2,耦合循环效率为0.35。蒸发温度提高或冷凝温度降低,均有利于热泵性能和耦合循环效率的提高。此研究为回收加热炉余热和提高电厂效率提供理论基础。Presented was the waste heat recovery of a heater realized by using a transcritical carbon dioxide heat pump coupled with the Rankine cycle.By adopting the thermodynamic method,the key parameters influencing the efficiency of the coupled cycle and the performance of the transcritical carbon dioxide heat pump were studied respectively.With an increase of the COP of the heat pump,the efficiency of the coupled cycle will go up.After the performance parameter of the heat pump has exceeded its limit value,the bigger the power consumption ratio of the compressor,the lower the efficiency of the coupled cycle.Within the exhaust gas pressure range of the heat pump,both COP of the heat pump and the efficiency of the coupled cycle have their limit values.Under the given conditions,the optimum exhaust gas pressure is regarded as 8.5 MPa,the COP as 4.2 and the efficiency of the coupled cycle as 0.35.To raise the evaporation temperature or to lower the condensing temperature can enhance the performance of the heat pump and the efficiency of the coupled cycle.The foregoing can offer a theoretical basis for recovering the waste heat of a heater and enhancing the efficiency of a power plant.

关 键 词：跨临界CO2热泵 朗肯循环 耦合循环 性能分析 热力学方法 

分 类 号：TK123[动力工程及工程热物理—工程热物理]