Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles

Mature power plant uses regenerative steam Rankine cycle to achieve excellent performance, but there is a lack of general approach for gas Brayton cycle. Here, synergetics is introduced to construct multi-compressions S-CO2 cycle for the first time. Our work starts from the analysis of recompression...

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Main Authors: Enhui Sun, Jinliang Xu, Mingjia Li, Hangning Li, Chao Liu, Jian Xie
Format: Article
Language:English
Published: Elsevier 2020-09-01
Series:Energy Conversion and Management: X
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2590174520300143
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spelling doaj-b42298828d374f3aa26e7d83266978d92020-11-25T03:26:56ZengElsevierEnergy Conversion and Management: X2590-17452020-09-017100042Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cyclesEnhui Sun0Jinliang Xu1Mingjia Li2Hangning Li3Chao Liu4Jian Xie5Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, ChinaBeijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, China; Key Laboratory of Power Station Energy Transfer Conversion and System, North China Electric Power University, Ministry of Education, Beijing 102206, China; Corresponding author.Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, ChinaBeijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, ChinaBeijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, ChinaBeijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization, North China Electric Power University, Beijing 102206, China; Key Laboratory of Power Station Energy Transfer Conversion and System, North China Electric Power University, Ministry of Education, Beijing 102206, ChinaMature power plant uses regenerative steam Rankine cycle to achieve excellent performance, but there is a lack of general approach for gas Brayton cycle. Here, synergetics is introduced to construct multi-compressions S-CO2 cycle for the first time. Our work starts from the analysis of recompression cycle (RC). RC is decoupled into two simple Brayton cycles (SCs). We show that at the optimal split ratio of flow rate, the mixing stream coming from the two subsystems does not generate exergy destruction, and the heat transfer induced exergy destruction is controlled to an acceptable level. Thus, the two subsystems are synergistic to have the efficiency reinforcing feedback. This finding inspires us to construct multi-compressions cycle. For example, the tri-compressions cycle (TC) is built by cooperation between RC and SC, and the four-compressions cycle (FC) is formed based on TC and SC. At the main vapor parameters 550 °C/20 MPa, thermal efficiencies are increased from 47.43% for RC to 49.47% for TC. A regime map is presented to select multi-compressions cycle based on main vapor parameters. We state that both of multi-compressions and reheating are effective. The combination of both approaches further improves system performance, but multi-compressions are preferable because the high temperature induced heat transfer issue can be avoided. This work fills the gap on how to reach excellent performance for gas Brayton cycle driven by various heat sources such as nuclear energy, solar energy and fossil energy etc.http://www.sciencedirect.com/science/article/pii/S2590174520300143Supercritical carbon dioxide (S-CO2) cycleSynergeticsThermal efficiencyMulti-compressionsRenewable energy
collection DOAJ
language English
format Article
sources DOAJ
author Enhui Sun
Jinliang Xu
Mingjia Li
Hangning Li
Chao Liu
Jian Xie
spellingShingle Enhui Sun
Jinliang Xu
Mingjia Li
Hangning Li
Chao Liu
Jian Xie
Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles
Energy Conversion and Management: X
Supercritical carbon dioxide (S-CO2) cycle
Synergetics
Thermal efficiency
Multi-compressions
Renewable energy
author_facet Enhui Sun
Jinliang Xu
Mingjia Li
Hangning Li
Chao Liu
Jian Xie
author_sort Enhui Sun
title Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles
title_short Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles
title_full Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles
title_fullStr Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles
title_full_unstemmed Synergetics: The cooperative phenomenon in multi-compressions S-CO2 power cycles
title_sort synergetics: the cooperative phenomenon in multi-compressions s-co2 power cycles
publisher Elsevier
series Energy Conversion and Management: X
issn 2590-1745
publishDate 2020-09-01
description Mature power plant uses regenerative steam Rankine cycle to achieve excellent performance, but there is a lack of general approach for gas Brayton cycle. Here, synergetics is introduced to construct multi-compressions S-CO2 cycle for the first time. Our work starts from the analysis of recompression cycle (RC). RC is decoupled into two simple Brayton cycles (SCs). We show that at the optimal split ratio of flow rate, the mixing stream coming from the two subsystems does not generate exergy destruction, and the heat transfer induced exergy destruction is controlled to an acceptable level. Thus, the two subsystems are synergistic to have the efficiency reinforcing feedback. This finding inspires us to construct multi-compressions cycle. For example, the tri-compressions cycle (TC) is built by cooperation between RC and SC, and the four-compressions cycle (FC) is formed based on TC and SC. At the main vapor parameters 550 °C/20 MPa, thermal efficiencies are increased from 47.43% for RC to 49.47% for TC. A regime map is presented to select multi-compressions cycle based on main vapor parameters. We state that both of multi-compressions and reheating are effective. The combination of both approaches further improves system performance, but multi-compressions are preferable because the high temperature induced heat transfer issue can be avoided. This work fills the gap on how to reach excellent performance for gas Brayton cycle driven by various heat sources such as nuclear energy, solar energy and fossil energy etc.
topic Supercritical carbon dioxide (S-CO2) cycle
Synergetics
Thermal efficiency
Multi-compressions
Renewable energy
url http://www.sciencedirect.com/science/article/pii/S2590174520300143
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