Study on supercritical carbon dioxide Brayton cycle cooling source disturbance control

SUN Yuwei; LIU Fulin; WEI Wei; YUAN Chengqing; SONG Zhenguo

doi:10.19693/j.issn.1673-3185.02980

Volume 18 Issue 5

Oct. 2023

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Chinese Journal of Ship Research > 2023 > 18(5): 234-243. > DOI: 10.19693/j.issn.1673-3185.02980 CSTR: 32390.14.j.issn.1673-3185.02980

SUN Y W, LIU F L, WEI W, et al. Study on supercritical carbon dioxide Brayton cycle cooling source disturbance control[J]. Chinese Journal of Ship Research, 2023, 18(5): 234–243. DOI: 10.19693/j.issn.1673-3185.02980

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Study on supercritical carbon dioxide Brayton cycle cooling source disturbance control

SUN Yuwei^{1, 2,},
LIU Fulin^{1, 2,},
WEI Wei³,
YUAN Chengqing^{2, 3, ,},
SONG Zhenguo⁴

1.
School of Naval Architecture , Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, China
2.
National Engineering Research Center for Water Transport Safety, Wuhan University of Technology, Wuhan 430063, China
3.
School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China
4.
China Ship Development and Design Center, Wuhan 430064, China

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Received Date: June 28, 2022
Revised Date: August 14, 2022
Available Online: August 20, 2022

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Objectives This paper aims to cope with the possible impact of external condition disturbances on the operating parameters of a supercritical carbon dioxide (S-CO₂) Brayton cycle power generation system and ensure its efficient, safe and stable operation.
Methods A dynamic numerical simulation model of a simple S-CO₂ Brayton cycle power generation system is built using the Matlab/Simulink platform, and the transient operation characteristics of the system are analyzed. The change laws of the operating parameters of the thermodynamic cycle system under changing cooler parameters are then simulated, and the influence of the temperature fluctuation of the cooling source on the inlet and outlet parameters of the system components, system cycle efficiency and adjustment methods are analyzed.
Results The results show that the maximum error between the established system transient simulation model results and the experimental results is 3.658%; a 2 K increase in the cooling water temperature will lead to a 1.4 K increase in the compressor inlet temperature, and the system will need 300 s to restore stability; after adding a PID control system, the compressor inlet temperature change amplitude is reduced by 50% and the system stabilization time is reduced by 62%.
Conclusions The established model can accurately reflect the operation of the system. Based on the opposition of the influence of cooling water temperature increase and flow increase on the system, the proposed PID control system can ensure that the carbon dioxide working fluid in the system is always above the critical point, thereby ensuring the safe and stable operation of the system.
- supercritical carbon dioxide (S-CO₂),
- Brayton cycle,
- numerical modeling,
- dynamic characteristics,
- PID control

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