Regulation of reheating temperatures for sCO2 coal-fired power plant to improve the peak regulation depth

IF 9 1区 工程技术 Q1 ENERGY & FUELS Energy Pub Date : 2025-03-12 DOI:10.1016/j.energy.2025.135485
Haonan Zheng , Jinliang Xu , Jian Xie , Guanglin Liu
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引用次数: 0

Abstract

Unstable renewable energies can be stabilized by the partial-load-operation (PLO) of supercritical carbon dioxide (sCO2) coal-fired power plant, under which the reheating temperature deviates from the rated value to deteriorate the efficiency and safety. Challenge exists on the varied heat absorption ratio of the reheater under PLO conditions. We break through the limitation of the reheater arranged in the convection region only for water-steam boiler, but propose a hybrid radiation-convection-reheater (RCRH) for sCO2 boiler to stabilize the reheating temperature. Three methods including RCRH, flue gas recirculation (FGR) and burner angle adjustment (BAA) are compared, by establishing a partial load model. Our results show that without regulation, the reheating temperature decreases by 32 K at 20 % load, which is not acceptable. FGR and BAA mitigate the reheating temperature deviation to 23 K and 22 K respectively at 20 % load. To satisfy the criterion of 10 K temperature deviation, both FGR and BAA cover the load ratio range of (45–100) %, indicating not effectiveness of these methods. RCRH mitigates the reheating temperature deviation to (1∼2.5) K covering a wide load ratio range of (20–100) %, indicating a large peak regulation depth of 80 % rated power. The proposed RCRH ensures the sCO2 power plant to operate at an ultra-low load ratio, which is beneficial to balance unstable renewable energies.
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来源期刊
Energy
Energy 工程技术-能源与燃料
CiteScore
15.30
自引率
14.40%
发文量
0
审稿时长
14.2 weeks
期刊介绍: Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.
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