Performance Study on SCO<sub>2</sub> Reheat-Recompression System Based on Advanced Exergy Analysis

SHI Tongtong; XUE Xiaojun; ZHENG Lixing; WU Yanli; ZHANG Meiling

doi:10.19805/j.cnki.jcspe.2026.250157

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Performance Study on SCO₂ Reheat-Recompression System Based on Advanced Exergy Analysis

更新时间：2026-06-11

- Performance Study on SCO₂ Reheat-Recompression System Based on Advanced Exergy Analysis
- Chinese Journal of Power Engineering Vol. 46, Issue 6, Pages: 203-212(2026)
- 作者机构：
  
  1. 山西大学电力与建筑学院,山西,太原,030006
  2. 国网山西省电力公司营销服务中心,山西,太原,030025
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250157
  CLC： TK12
- Published：2026
- 稿件说明：
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时彤彤, 薛小军, 郑立星, 吴彦丽, 张美玲. 基于先进㶲分析的SCO2再热再压缩系统性能研究[J]. 动力工程学报, 2026, 46(6): 203-212.
时彤彤, 薛小军, 郑立星, 吴彦丽, 张美玲. 基于先进㶲分析的SCO2再热再压缩系统性能研究[J]. 动力工程学报, 2026, 46(6): 203-212. DOI： 10.19805/j.cnki.jcspe.2026.250157.

DOI： 10.19805/j.cnki.jcspe.2026.250157

摘要

超临界二氧化碳(SCO2)再热再压缩系统具有CO2分流冷却和两级回热的设计

相比传统SCO2布雷顿循环

可以有效减少系统功耗

提高系统循环效率。为进一步对SCO2再热再压缩系统进行优化

构建了SCO2再热再压缩系统的热力学模型

并利用先进㶲分析的方法研究了系统的㶲性能

进而揭示了系统内部各部件之间的相互作用及系统的改进潜力。结果表明:系统内源㶲损占比为80.91%

可避免㶲损占比为33.56%。部件的优化潜力顺序为冷却器、主压缩机、锅炉、再压缩机、高温回热器、低压透平、高压透平以及低温回热器。此外

改进冷却器、低温回热器和再压缩机的性能可减少其余部件的外源㶲损。研究可为SCO2再热再压缩系统优化提供理论指导。

Abstract

Supercritical CO2 (SCO2) reheat-recompression system features CO2 split-flow cooling and dual-stage recuperation design which can reduce power consumption and improve cycle efficiency compared to conventional SCO2 Brayton cycle. In order to further optimize the SCO2 reheat-recompression system

a thermodynamic model of the system was set up. Advanced exergy analysis was applied to study system exergy performance

uncovering interactions among components and system optimization potential. Results show that system endogenous exergy destruction constitutes 80.91% of total losses

while avoidable exergy destruction accounts for 33.56%. Component optimization potential priority is ranked as follows: cooler

main compressor

boiler

recompressor

high-temperature recuperator

low-pressure turbine

high-pressure turbine

low-temperature recuperator. Furthermore

enhancing the performance of cooler

low-temperature recuperator

and recompressor can mitigate exogenous exergy destruction of other components. This study provides theoretical guidance for SCO2 reheat-recompression system optimization.

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Performance Study on SCO2 Reheat-Recompression System Based on Advanced Exergy Analysis

DOI：10.19805/j.cnki.jcspe.2026.250157

摘要

Abstract

关键词

Keywords

references

Performance Study on SCO₂ Reheat-Recompression System Based on Advanced Exergy Analysis