Thermo-economic analysis and comparison of a CO2 transcritical power cycle and an organic Rankine cycle
Thermo-economic analysis and comparison of a CO2 transcritical power cycle and an organic Rankine cycle
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DOI：
10.1016/j.geothermics.2013.09.005
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发表时间：
2014-04
期刊：
影响因子：
3.9
通讯作者：
Maoqing Li;Jiangfeng Wang;Saili Li;Xurong Wang;Weifeng He;Yiping Dai
中科院分区：
文献类型：
--
作者：
Maoqing Li;Jiangfeng Wang;Saili Li;Xurong Wang;Weifeng He;Yiping Dai
CO2跨临界动力循环（CDTPC）和有机朗肯循环（ORC）由于其优异的热力学性能，可以有效回收低品位热量。本文以R123、R245fa、R600a、R601为工质，在90~120℃的低温地热源驱动下，对CDTPC和ORC进行了热经济分析和比较。这两个功率循环根据五个指标进行评估：净功率输出、热效率、火用效率、每净功率输出成本（CPP）和换热器成本与整个系统成本的比率（ROC）。结果表明，蓄热室可以提高两个动力循环的热力学性能。与 R600a 配合使用的 ORC 具有最高的净功率输出，而与 R601 配合使用的再生式 ORC 则获得了最高的热效率和火用效率。再生式CDTPC的最大净功率输出略高于基本CDTPC。 CDTPC在CPP方面比ORC具有更好的经济性能，并且在一定的涡轮进口压力下，再生式CDTPC的CPP甚至低于基本CDTPC。
CO2transcritical power cycle (CDTPC) and organic Rankine cycle (ORC) can effectively recover low grade heat due to their excellent thermodynamic performance. This paper conducts thermo-economic analysis and comparison of a CDTPC and an ORC using R123, R245fa, R600a and R601 as the working fluids driven by the low temperature geothermal source with the temperature ranging from 90 °C to 120 °C. The two power cycles are evaluated in terms of five indicators: net power output, thermal efficiency, exergy efficiency, cost per net power output (CPP) and the ratio of the heat exchangers’ cost to the overall system's cost (ROC). Results indicate that the regenerator can increase the thermodynamic performance of the two power cycles. The ORC working with R600a presents the highest net power output while the highest thermal and exergy efficiencies are obtained by the regenerative ORC working with R601. The maximum net power output of the regenerative CDTPC is slightly higher than that of the basic CDTPC. The CDTPC has a better economic performance than ORC in terms of CPP and under a certain turbine inlet pressure the CPP of the regenerative CDTPC is even lower than that of the basic CDTPC.