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提出跨临界CO2热泵和朗肯循环耦合实现凝汽器余热回收的方式。分别对郎肯循环、再热循环及跨临界CO2热泵和朗肯循环的耦合循环进行了热力学分析,分析表明:随着主蒸汽温度增加或乏汽温度降低,3种循环的效率均增加,朗肯循环平均效率为31.5%,耦合循环平均效率为35.5%,再热循环平均效率为33.5%;随着主蒸汽压力增加或乏汽压力降低,3种循环的效率均呈增加趋势。相同对比条件下,耦合循环效率最高,朗肯循环效率最低,再热循环介于二者之间。
The transconductance CO2 heat pump and Rankine cycle coupling method are proposed to realize the waste heat recovery of the condenser. The thermodynamic analysis of the coupled cycles of the Rankine cycle, the reheat cycle, the transcritical CO2 heat pump and the Rankine cycle were carried out. The results show that the efficiency of the three cycles increases with the increase of the main steam temperature or the decrease of the steam temperature. The average efficiency of the cycle was 31.5%, the average efficiency of the coupling cycle was 35.5%, and the average efficiency of the reheat cycle was 33.5%. The efficiency of the three cycles increased with the increase of the main steam pressure or the steam pressure. Under the same comparison conditions, the coupling cycle efficiency is the highest, the Rankine cycle efficiency is the lowest, and the reheat cycle is between the two.