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首页> 外文期刊>Energy Conversion & Management >Enhancing the thermal and economic performance of supercritical CO_2 plant by waste heat recovery using an ejector refrigeration cycle
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Enhancing the thermal and economic performance of supercritical CO_2 plant by waste heat recovery using an ejector refrigeration cycle

机译：使用喷射器制冷循环加强废热回收超临界CO_2植物的热和经济性能

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摘要

Supercritical CO2 cycle has an optimal performance when the cycle minimum temperature is around the critical temperature (31 degrees C), which is impossible at hot climatic conditions. To solve this problem, this work hybridizes a supercritical CO2 cycle with an ejector refrigeration cycle (ERC) to cool the minimum temperature of the cycle to be about 31 degrees C and hence achieving the highest possible performance. Comprehensive energy, exergy, and economic analyses are carried out to explore the mechanisms of performance improvement of the novel combined plant. Sensitivity analysis is performed to recognize the most influencing parameters on the performance of the combined plant. Based on the sensitivity analysis, the effect of different operating and design parameters on the system performance is investigated. Furthermore, a multi-objective optimization study is performed to find the trade-off between exergy efficiency and cost-saving. Among the different the five refrigerants used for ERC, the results illustrate that R717 is the most efficient one for the present hybridization. The exergy destruction in the precooler reduces from 15.5% to 0.7% when ERC is combined with the sCO(2) cycle. Thus, the energy efficiency (eta(th)) and exergy efficiency (eta(ex)) increase by 9.5%, while the levelized cost of energy (LCOE) declines by 10.7%. Compared with the standalone sCO(2) cycle, the produced power, eta(th), eta(ex), and LCOE of the optimized plant improve by 94.3%, 36.2%, 28.6%, and 18.3%, respectively.
机译：超临界CO2循环在循环最小温度围绕临界温度（31摄氏度）时具有最佳性能，这在热气态条件下是不可能的。为了解决这个问题，该工作与喷射器制冷循环（ERC）杂交超临界CO2循环，以将循环的最小温度冷却至约31℃，因此实现最高性能。进行全面的能量，暴力和经济分析，以探讨新型组合植物的性能改善机制。进行敏感性分析以识别组合工厂性能的最大影响参数。基于灵敏度分析，研究了不同操作和设计参数对系统性能的影响。此外，进行多目标优化研究，以找到高效率和节省成本之间的权衡。在用于ERC的五种制冷剂中，结果说明R717是本发明杂交最有效的。当ERC与SCO（2）循环结合时，预冷却器中的暴力破坏从15.5％降至0.7％。因此，能量效率（ETA（TH））和高级效率（ETA（EX））增加了9.5％，而能量（LCoE）的调整成本下降10.7％。与独立的SCO（2）循环相比，优化植物的产生的功率，ETA（TH），ETA（EX）和LCoE分别提高了94.3％，36.2％，28.6％和18.3％。

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