<p>In this paper, the supercritical carbon dioxide power cycle used to recover the waste heat of gas turbine is investigated by means of conventional exergy analysis and advanced exergy analysis. Firstly, thermodynamic parameters of the carbon dioxide cycle under design condition are determined by single-objective optimization with system exergy efficiency as objective function. Then, advanced exergy analysis, in which the exergy destruction is divided into endogenous / exogenous and avoidable / unavoidable parts is adopted to reveal the improvement potential of the system and illustrate the interaction among the components. According to the calculation results, a total amount of 2.57MW (33.25%) of exergy destruction could be reduced by the improvement of component efficiency. Endogenous exergy destruction is higher than exogenous exergy destruction in all components. Based on the results of conventional exergy analysis, the high-temperature heater and cooler should be paid attention in order to reduced exergy destruction. However, based on the results of advanced exergy destruction, the technical improvement of turbine and compressor should be emphasized due to their high endogenous-avoidable exergy destruction. On the other hand, for the components with high unavoidable exergy destruction like high-temperature heater and cooler, extra devices or cycles should be employed to exploit the underutilized energy and enhance their performance.</p>

Advanced Exergy Analysis of the Supercritical Carbon Dioxide Power Cycle for Waste Heat Recovery of Gas Turbine

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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