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Date of Publication:2021-01-01

Journal:Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics

Affiliation of Author(s):能源与动力学院

Volume:42

Issue:10

Page Number:2544-2552

ISSN No.:0253-231X

Abstract:Compared with the traditional thermal power generation system, the supercritical carbon dioxide (SCO2) Brayton cycle power generation system has the advantages of small system size, high cycle efficiency and easy access to working medium. In this paper, three cycle models were established by using Aspen HYSYS and Aspen Plus software respectively: simple cycle, re-compression cycle and split-flow re-compression cycle. Three physical property methods were used to simulate each cycle. Compared with the data from laboratory, the simulation accuracy of different physical property methods was studied, and the data showed that the REFPROP physical property method based on Aspen Plus software was more accurate. Then, under different working conditions, this physical property method was used to calculate and compare the cycle efficiency of three cycles under the same working conditions. The results show that the regenerative heat is very important for high efficiency. Finally, based on the re-compression cycle model, the effects of five main parameters on the cycle efficiency were studied under different regenerative conditions. The conclusion of this paper can provide a reference for the design of the re-compression cycle model of SCO2. © 2021, Science Press. All right reserved.

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