Advanced exergoeconomic evaluation on supercritical carbon dioxide recompression Brayton cycle. (20th May 2020)

• Record Type: Journal Article
• Authors: Liu, Zhan; Liu, Zihui; Cao, Xing; Luo, Tao; Yang, Xiaohu
• Is Part Of: Journal of cleaner production. Volume 256(2020)
• Publication Date: 2020-05-20
• Subjects: Performance evaluation -- Supercritical CO2 recompression cycle -- Thermoeconomic evaluation -- Advanced exergoeconomic analysis -- Costs splitting; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.120537
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: This study proposes a comprehensive understanding of the supercritical carbon dioxide recompression Brayton cycle by means of extending and applying the advanced exergoeconomic method as one of the first attempts. The advantages of this advanced exergy-based method are determining the real potential for improvement of each significant component and considering the interactions among system components, which cannot be achieved by using the conventional method. The unavoidable/avoidable and endogenous/exogenous concepts are introduced, and detailed modeling is performed to calculate exergy destruction and investment costs. The results demonstrate that the unavoidable value of each component is higher than the avoidable value for exergy destruction cost (except for high temperature recuperator). Even under the most optimistic scenario, the total exergy destruction cost can only be reduced by 2199.29 $/h (38.86%), and about half of this avoidable variable is exogenous. According to the results of traditional exergoeconomic analysis, the reactor is recommended as the governing component to improve the cost effectiveness of the cycle due mainly to its highest operating cost (5313.39 $/h). On the contrast, the turbine should have the highest improvement priority owing to the highest value of the avoidable operating cost (1390.88 $/h). The findings provide a novel way to guide the design and evaluation of the carbon dioxide Brayton cycle through benefiting from the advanced exergoeconomic analysis. Graphical abstract: Image 1051 Highlights: Advanced exergoeconomic analysis is applied to supercritical CO2 Brayton cycle. Only 38.86% of overall exergy destruction cost can be reduced at best conditions. Strong interactions among components occur in the supercritical power cycle. Precooler should be improved at the expense of increasing its investment cost.