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Off-design performance analysis of a new 300 MW supercritical CO2 coal-fired boiler.

Authors :
Tong, Yongjing
Duan, Liqiang
Pang, Liping
Source :
Energy. Feb2021, Vol. 216, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

In order to solve existing problems of large working fluid pressure drop and lower reheated working fluid temperature under part load conditions, a new 300 MW S–CO 2 coal-fired boiler heating surface arrangement is proposed and its off-design performances are studied. The new S–CO 2 boiler adopts the single furnace double-tangential circle arrangement without the center wall and increases the proportion of reheat radiant heat exchange surfaces. The performance analysis model is built. The variations of the reheated working fluid temperature, working fluid pressure drop and the off-design performances of the boiler with the changes of coal type, excess air coefficient and operating load are investigated. The results show under the design load, the total pressure drop of working medium in the furnace is reduced by 0.48 MPa, under 30% of the design load, the reheated working medium temperature is increased by 7.62 °C, and the lower heating value and components of coal greatly influence the boiler efficiency. When the excess air coefficient is 1.2–1.4, the best efficiency zone is reached. The load range with the optimal efficiency zone is about 70%–100% of the design load. Achievement of this paper will provide valuable references for the design of the S–CO 2 coal-fired boiler. • The conventional coal-fired boiler configuration is not fit for the S–CO 2 cycle. • Arrangement of heating surfaces of S–CO 2 boiler influences the overall performance. • A new S–CO 2 coal-fired boiler is proposed and off-design performances are studied. • New boiler has better performances at both the design and off-design conditions. • The new boiler configuration can improve the overall system thermal efficiency. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03605442
Volume :
216
Database :
Academic Search Index
Journal :
Energy
Publication Type :
Academic Journal
Accession number :
147717599
Full Text :
https://doi.org/10.1016/j.energy.2020.119306