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Journal of Thermal Science

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2024 , Vol. 33 >Issue 5: 1630 - 1641

DOI: https://doi.org/10.1007/s11630-024-1977-1

Heat Recuperation for the Self-Condensing CO2 Transcritical Power Cycle

  • PAN Lisheng ,
  • SHI Weixiu ,
  • SUN Yin ,
  • SUN Yiwei ,
  • WEI Xiaolin
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  • 1. State Key Laboratory of High-temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China 
    2. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

网络出版日期: 2024-09-08

基金资助

Projects 51776215 and 12372237 supported by National Natural Science Foundation of China are gratefully acknowledged.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Heat Recuperation for the Self-Condensing CO2 Transcritical Power Cycle

  • PAN Lisheng ,
  • SHI Weixiu ,
  • SUN Yin ,
  • SUN Yiwei ,
  • WEI Xiaolin
Expand
  • 1. State Key Laboratory of High-temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China 
    2. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Online published: 2024-09-08

Supported by

Projects 51776215 and 12372237 supported by National Natural Science Foundation of China are gratefully acknowledged.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

超临界CO2布雷顿循环具有效率高、系统结构紧凑等优点，在发电领域具有巨大应用潜力。以自冷凝CO2跨临界动力循环为研究对象，建立了循环性能理论分析模型，分别分析了无回热循环、后回热循环、先回热循环和再回热循环四种不同系统布局。结果表明：随着冷却压强的增大和冷却终温的降低，内部正循环占整个循环的比重增大；超临界加热器的热负荷随冷却压强的增大而减小。从性能上看，再回热循环和先回热循环的热效率相似，且远高于其他两种系统布局。除冷却终温为31°C时的工况，热效率和净输出功率随冷却压强的变化均存在极大值。同时考虑到复杂性和经济性，先回热循环比其他系统布局更优。在冷却终温为35°C时，先回热循环的热效率在冷却压强为8.4 MPa时达到峰值0.34，净输出功率在冷却压强为8.2 MPa时达到峰值2355.24 kW。

关键词： CO2 transcritical power cycle; heat recuperation process; self-condensing

本文引用格式

PAN Lisheng , SHI Weixiu , SUN Yin , SUN Yiwei , WEI Xiaolin . Heat Recuperation for the Self-Condensing CO2 Transcritical Power Cycle[J]. 热科学学报, 2024 , 33(5) : 1630 -1641 . DOI: 10.1007/s11630-024-1977-1

Abstract

The supercritical CO2 Brayton cycle has potential to be used in electricity generation occasions with its advantages of high efficiency and compact structure. Focusing on a so-called self-condensing CO2 transcritical power cycle, a model was established and four different layouts of heat recuperation process were analyzed, a without-recuperation cycle, a post-recuperation cycle, a pre-recuperation cycle and a re-recuperation cycle. The results showed that the internal normal cycle’s share of the whole cycle increases with increasing the cooling pressure and decreasing the final cooled temperature. Heat load in the supercritical heater decreases with increasing the cooling pressure. From perspective of performance, the re-recuperation cycle and the pre-recuperation cycle have similar thermal efficiency which is much higher than other two layouts. Both thermal efficiency and net power output have a maximum value with the cooling pressure, except in the condition with the final cooled temperature of 31°C. Considering both the complexity and the economy, the pre-recuperation cycle is more applicable than the other options. Under 35°C of the final cooled temperature, the thermal efficiency of the pre-recuperation cycle reaches the peak 0.34 with the cooling pressure of 8.4 MPa and the maximum net power output is 2355.24 kW at 8.2 MPa of the cooling pressure.

Key words： CO2 transcritical power cycle; heat recuperation process; self-condensing

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