Comparative study on dynamic characteristics of 600 MW supercritical coal-fired boilers using CO2 and water as working fluids

Kairui Liu, Limin Wang, Wengang Bai and Defu Che

Energy, 2025, vol. 314, issue C

Abstract: Currently, little attention has been paid to the dynamic characteristics of the supercritical CO2 (S-CO2) boiler, which dominate the dynamic performance of the S-CO2 coal-fired power generation system. In this study, a novel 600 MW S-CO2 boiler design was proposed, and its dynamic model was established and validated. The dynamic characteristics of the S-CO2 boiler under step disturbances in working fluid flow rate and coal feeding rate were analyzed and compared with those of a supercritical water boiler. When the CO2 mass flow rate and coal feeding rate were suddenly reduced by 5 %, the main CO2 temperature changed by +5.52 °C and −6.11 °C, with response times of 220 s and 250 s, respectively. The reheat CO2 temperature changed by +5.46 °C and −4.82 °C, with response times of 110 s and 200 s, respectively. Among all heating surfaces, the split economizer exhibited the longest response time. The S-CO2 boiler demonstrated a response time approximately 700 s shorter than that of the supercritical water boiler under identical disturbance conditions, with the variation in superheater outlet temperature being only about one-sixth as large. These results may provide valuable insights into optimizing operation and designing control strategies for the S-CO2 boiler.

Keywords: Coal-fired boiler; Supercritical CO2 cycle; Dynamic characteristic; Flexibility; Transient process (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:314:y:2025:i:c:s036054422404074x

DOI: 10.1016/j.energy.2024.134296

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