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Journal of Thermal Science

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2022 , Vol. 31 >Issue 6: 1881 - 1890

DOI: https://doi.org/10.1007/s11630-022-1526-8

Performance Analysis of Cooling Wall of Supercritical CO2 Coal-Fired Plants

  • WANG Yanjuan ,
  • YU Binhui ,
  • GAO Shuo ,
  • LIU Qibin ,
  • XU Jinliang
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  • 1. The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, China
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2023-12-04

基金资助

The authors appreciate the financial support provided by the National Natural Science Foundation of China (52076075) and Fundamental Research Funds for the Central Universities (Grant No. 2020DF002).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Performance Analysis of Cooling Wall of Supercritical CO2 Coal-Fired Plants

  • WANG Yanjuan ,
  • YU Binhui ,
  • GAO Shuo ,
  • LIU Qibin ,
  • XU Jinliang
Expand
  • 1. The Beijing Key Laboratory of Multiphase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, China
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2023-12-04

Supported by

The authors appreciate the financial support provided by the National Natural Science Foundation of China (52076075) and Fundamental Research Funds for the Central Universities (Grant No. 2020DF002).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

超临界二氧化碳（S-CO2）循环可以有效提高燃煤发电系统的效率，针对S-CO2燃煤火力发电系统冷却壁，本文同时开展了实验及模拟研究。综合考虑热应力场的影响，通过质量、动力、能量方程与热应力方程的耦合机理研究，建立了流动-传热-应力多物理场耦合的S-CO2燃煤火力发电系统冷却壁物理模型。借助搭建的S-CO2高温高压实验台的实验数据，进行了模拟与实验的对比分析，模拟结果与实验测量结果均吻合较好，验证了多物理场耦合模型的可行性。探讨了冷却壁直径、质量流量、热流密度、倾斜角度等关键运行参数对冷却壁性能的影响；分析了冷却壁温度场、热应力场及总应变场的分布规律；并与以水蒸汽作为传热工质的水冷壁性能进行了对比研究。由于物性参数差异，以S-CO2作为传热工质的冷却壁温度、温升、周向热应力大小远远高于以水蒸汽作为传热工质时的温度、温升、周向热应力大小；倾角对S-CO2燃煤火力发电系统冷却壁的温度分布影响较小，但压降随着倾角的增加显著增加；增加管径可以同时有效降低冷却壁温度、温升和压降。冷却壁温度随着质量流量的增加而降低，但是压降随质量流量的增加成指数增加。本研究为S-CO2燃煤火力发电系统的设计提供依据。

关键词： supercritical CO2; cooling wall; coal-fired power plant; heat transfer

本文引用格式

WANG Yanjuan , YU Binhui , GAO Shuo , LIU Qibin , XU Jinliang . Performance Analysis of Cooling Wall of Supercritical CO2 Coal-Fired Plants[J]. 热科学学报, 2022 , 31(6) : 1881 -1890 . DOI: 10.1007/s11630-022-1526-8

Abstract

Using supercritical CO2 (S-CO2) instead of water steam as heat transfer fluid for coal-fired power plants is another way to further improve the power generation efficiency. In this paper, a multi-field coupling model that integrates fluid flow, heat transfer and thermal stress is proposed to solve the complex problem. The effects of the key operating parameters on the performances of the cooling wall are numerically investigated. More details of the characteristics of fluid dynamics, thermal stress, pressure drop, coupled heat transfer and the whole flow and temperature fields in the S-CO2 cooling wall are revealed and discussed. A comparison study is made between the cooling wall tube and waterwall tube. Both temperature and thermal deformations of cooling wall tube are much higher than that of water. Numerical simulation results indicate that inclination angle has little effects on the temperature distribution, while increase of pressure drop is obvious as the inclination angle increases. Increasing tube diameter can effectively reduce both the pressure drop and the temperature of the cooling wall tube. As a result, a new insight is introduced for the design of S-CO2 power cycle.

Key words： supercritical CO2; cooling wall; coal-fired power plant; heat transfer

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