Mechanical Engineering Science

Design Optimization of Boiler Tail Flue in Supercritical Carbon Dioxide Power Generation System

YEWenli, XUJinliang, LIUGuanglin


The S-CO2 top-bottom combined cycle based on overlap energy utilization can lead to excessive heating area, due to the small temperature difference and the large thermal load for the heating surface at the tail of the boiler. Therefore, reasonable optimization indexes are needed for design optimization. Common optimization indexes include heating area and working medium pressure drop, but lower working medium pressure drop usually leads to large heating area, for example, with the increase of tube inner diameter or boiler width, the pressure drop decreases but the heating area increases. Thus, if both are used as optimization indexes, it will be difficult to choose the optimum tube inner diameter and boiler width. In this paper, exergy loss analysis is used, in combination with economic analysis, the optimization index is unified to the cost per unit heat transfer of the heating surface. The thermal calculation and pressure drop calculation models are established for the heating surface at the tail of the boiler. The optimized heating surface can greatly improve the economic benefit.


S-CO2 cycle; calculation model; exergy loss analysis; optimization of the boiler

Full Text:



Xu J L, Liu C. Perspective of SCO2 power cycles. Energy


Bai W , Zhang Y F. 300 MW boiler design study for coal-fired

supercritical CO2 Brayton cycle. Applied Thermal

Engineering 2018,135,66-73.

Zhou J, Ling P. Exergy analysis of a 1000 MW single reheat

advanced supercritical carbon dioxide coal-fired partial

flow power plant. Fuel 2019, 255,115777.

Tong Y J, Duan L Q. Off-design performance analysis of a

new 300MW supercritical CO2 coal-fired boiler. Energy

, 216, 119306.

Xu J L, Sun E H. Key issues and solution strategies for

supercritical carbon dioxide coal fired power plant. Energy

, 157, 227-246.

Sun E H, Xu J L. Overlap energy utilization reaches

maximum efficiency for S-CO2 coal fired power plant: A

new principle. Energy Conversion and Management 2019,

, 99-113.

Yan W P, Yan S L. Principles of Boiler, 2nd ed.; Publisher:

Beijing Science press,China,2014;pp. 154-188.

Yang D, Pan J. Experimental study and theoretical

calculation on hydrodynamic characteristics of (ultra)

supercritical boiler, 1st ed.; Publisher: China Electric Power

Press, China ,2017;pp. 205-257.

Design and Calculation method of Industrial Boiler Editorial

Board. Industrial boiler design calculation method, 1st ed.;

Publisher: China Standards Press,China,2005;pp. 56-89.

Tao W Q. Numerical heat transfer, 2nd ed.; Publisher: Xi'an:

Xi'an Jiaotong University Press, China ,2001;pp. 66-110.

Wang X Y. Engineering Thermodynamics, 2nd ed.;

Publisher: China Machine Press, China ,2016;pp. 168-188.

Hu H. Conceptual Design and Optimization of heating

Surface of Supercritical carbon dioxide Coal-fired Boiler.

Master's thesis, North China Electric Power University,


Zhang D, Li J X. Complete exergy efficiency analysis on

heat exchangers. Cryogenics and Superconductivity 2009,


Webb R L. Performance evaluation criteria for use of

enhanced heat transfer surface in heat exchanger design.

International Journal of Heat and Mass Transfer 1981,


Cheng X, Zhang Q. Analyses of entransy dissipation,

entropy generation and entransy dissipation-based thermal

resistance on heat exchanger optimization. Applied

Thermal Engineering 2012, 58,31-39.

Zhou L, Xu G. Parametric analysis and process optimization

of steam cycle in double reheat ultra-supercritical power

plants. Applied Thermal Engineering 2016, 99,652-660.

Xu G, Jin H G. A comprehensive techno-economic analysis

method for power generation systems with CO2 capture.

International Journal of Energy Research 2010, 34,321-332.



  • There are currently no refbacks.

Copyright (c) 2022 Wenli YE, Jinliang XU, Guanglin LIU

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.