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Journal of Thermal Science

热科学学报

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2024 , Vol. 33 >Issue 6: 2372 - 2385

DOI: https://doi.org/10.1007/s11630-024-2025-x

Tube-Wall Temperature Prediction of a 660-MW Ultra-Supercritical Double-Reheat Boiler under Flexible Peak Shaving

  • XU Jiaye ,
  • FAN Haojie ,
  • WU Xiaojiang ,
  • ZHANG Jian ,
  • YE Nina ,
  • ZHANG Qichao ,
  • ZHANG Zhongxiao
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  • School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

网络出版日期: 2024-11-05

基金资助

This work was funded by the Shanghai 2020 “Science and Technology Innovation Plan” Social Development Science and Technology Research Project (Grant No. 20dz1205202).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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Tube-Wall Temperature Prediction of a 660-MW Ultra-Supercritical Double-Reheat Boiler under Flexible Peak Shaving

  • XU Jiaye ,
  • FAN Haojie ,
  • WU Xiaojiang ,
  • ZHANG Jian ,
  • YE Nina ,
  • ZHANG Qichao ,
  • ZHANG Zhongxiao
Expand
  • School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Online published: 2024-11-05

Supported by

This work was funded by the Shanghai 2020 “Science and Technology Innovation Plan” Social Development Science and Technology Research Project (Grant No. 20dz1205202).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024
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摘要

灵活调峰时，超超临界二次再热锅炉会采用多种调温手段，这不仅使得锅炉壁温偏差增大，还提高了发生爆管事故的风险。本研究针对660MW二次再热锅炉高温受热面重叠部分建立了分室模型。通过现场试验数据对模型进行了校验，并应用该模型计算了不同负荷条件下的热焓和壁温分布情况。研究进一步分析了摆动燃烧器、调节烟气挡板和烟气再循环三种调温方式对壁温分布的影响。结果表明，在低负荷下，高温过热器容易出现超温现象。特别是调节烟气挡板会使二次再热器温度超过允许值21.4°C。此外，管壁温度沿宽度方向呈双峰分布特征。烟气再循环比例0%时，最大管壁温度偏差达到13.39°C，超过合理偏差范围3.39°C。相比之下，摆动燃烧器调温是最不容易导致壁温偏差和超温的方法。根据研究结果，摆动燃烧器的适宜调节范围是-20°至7°，烟气挡板的适宜调节范围是45%至60%，而烟气再循环的适宜比例则为8%至24%。综合考虑灵活调峰的具体需求，本研究选定了合适的调温方法，并明确了相应的调节范围。

关键词： compartment model; tube-wall temperature; double-reheat boiler; enthalpy distribution; flexible peak shaving

本文引用格式

XU Jiaye , FAN Haojie , WU Xiaojiang , ZHANG Jian , YE Nina , ZHANG Qichao , ZHANG Zhongxiao . Tube-Wall Temperature Prediction of a 660-MW Ultra-Supercritical Double-Reheat Boiler under Flexible Peak Shaving[J]. 热科学学报, 2024 , 33(6) : 2372 -2385 . DOI: 10.1007/s11630-024-2025-x

Abstract

Ultra-supercritical double-reheat boilers employ multiple temperature-regulating methods during flexible peak shaving. This exposes the boiler to significant tube-wall temperature deviations and overtemperatures. In this study, a compartment model was developed to subdivide the overlapping high-temperature heating surfaces of a 660-MW double-reheat boiler into smaller compartments. The model was verified using field experimental data and was applied to calculate the enthalpy and tube-wall temperature distributions under different loads. In addition, the effects of three temperature-regulating methods (swinging burners, regulating dampers, and flue gas recirculation) on the variation tendency and deviations of the tube-wall temperature were analysed. The results indicated that overtemperatures occurred in the high-temperature superheater under a low load. The regulating damper method caused the high-temperature secondary reheater to exceed the permissible temperature by 21.4°C. The tube-wall temperature exhibited a bimodal distribution along the width. At 0% flue gas recirculation, the maximum tube-wall temperature deviation attained 13.39°C, exceeding a reasonable value by 3.39°C. The swinging burner method was the least likely to cause tube-wall temperature deviations and overtemperatures. The reasonable regulation ranges for swinging burners, regulating dampers, and flue gas recirculation were –20° to 7°, 45% to 60%, and 8% to 24%, respectively. Based on different flexible peak shaving constraints, an appropriate temperature-regulating method was selected, and the regulation range was specified.

Key words： compartment model; tube-wall temperature; double-reheat boiler; enthalpy distribution; flexible peak shaving

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