Partial load operation characteristics of supercritical CO2 coal-fired power generation system

The steady-state model of a 300 MW supercritical CO2 coal-fired power generation system (SCPGS) is established to investigate its partial load characteristics. The SCPGS model predicts the reduction of reheat CO2 temperature in partial load operation, which is not reflected from the traditional blac...

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Bibliographic Details
Published in:Energy (Oxford) 2024-03, Vol.291, p.130415, Article 130415
Main Authors: Zheng, Haonan, Miao, Zheng, Xu, Jinliang
Format: Article
Language:English
Subjects:
Burner angle
carbon dioxide
coal
Control strategy
energy
furnaces
heat transfer
Partial load
power generation
slags
Split ratios
Supercritical CO2 coal-fired power generation system
temperature
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Summary:The steady-state model of a 300 MW supercritical CO2 coal-fired power generation system (SCPGS) is established to investigate its partial load characteristics. The SCPGS model predicts the reduction of reheat CO2 temperature in partial load operation, which is not reflected from the traditional black box model due to its simplification of heat transfer processes in the boiler. Effects of the burner angle and split ratios on regulating the reheat temperature is simulated. It is found that increasing the burner angle can effectively raise the reheat temperature and system efficiency. However, the higher furnace outlet temperature makes the heating surface easy to coke and slag. Changing the split ratios can also regulate the reheat temperature while the system efficiency is reduced. Accordingly, a comprehensive control strategy is proposed: at 100%–85 % load ratio, no regulation is applied; at 85%–45 % load ratio, the burner angle is gradually adjusted upward; at 45%–20 % load ratio, the burner angle is set to 30o and the split ratios are changed in the order of xEAP, xH4a, and xC2. This control strategy enables the SCPGS to achieve wide load regulation efficiently and safely and can provide guidance for the dynamic regulation of the SCPGS with variable load operation. •Steady state model of a 300 MW sCO2 coal-fired power generation system is developed.•The partial load operation characteristics of the SCPGS are studied.•The burner angle and split ratios are adjusted to regulate the reheat temperature.•A comprehensive control strategy is proposed to enable the wide load regulation.
ISSN:0360-5442
DOI:10.1016/j.energy.2024.130415