Study on the Strategy for Delaying Transition to Wet Mode Operation of 660MW Ultra-Supercritical Boilers at Low Loads

TANG Yongjie; WANG Chao; TAN Zhiwen; LIU Kairui; SUN Xingye; WANG Limin; CHE Defu

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Study on the Strategy for Delaying Transition to Wet Mode Operation of 660MW Ultra-Supercritical Boilers at Low Loads

更新时间：2026-07-29

- Study on the Strategy for Delaying Transition to Wet Mode Operation of 660MW Ultra-Supercritical Boilers at Low Loads
- JOURNAL OF XI’AN JIAOTONG UNIVERSITY (2026)
- 作者机构：
  
  1.动力工程多相流国家重点实验室(西安交通大学)，710049，西安
  2.内蒙古电力科学研究院，010000，呼和浩特市
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK22
- Received：23 April 2026，
  
  Revised：2026-07-15，
  
  Accepted：29 July 2026，
- 稿件说明：
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TANG Yongjie, WANG Chao, TAN Zhiwen, et al. Study on the Strategy for Delaying Transition to Wet Mode Operation of 660MW Ultra-Supercritical Boilers at Low Loads[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026.
DOI：

TANG Yongjie, WANG Chao, TAN Zhiwen, et al. Study on the Strategy for Delaying Transition to Wet Mode Operation of 660MW Ultra-Supercritical Boilers at Low Loads[J/OL]. JOURNAL OF XI’AN JIAOTONG UNIVERSITY, 2026. DOI：

摘要

针对超超临界直流锅炉在深度调峰时转为湿态运行导致机组经济性、安全性和环保性降低的问题，本文提出了基于炉侧回热的中间点抽汽回热、主蒸汽抽汽回热和炉侧储热回热三种推迟转湿态方案。建立了660 MW超超临界直流锅炉的模型并验证，明确了三种方案下最低的转态临界与干态临界负荷，分析了推迟转湿态前后工质参数与受热面温度的变化并对比了回热过程的㶲效率。结果表明：中间点抽汽回热、主蒸汽抽汽回热和炉侧储热回热可将最低转态临界负荷由25.67% THA分别推迟至19.71% THA、19.84% THA和19.77% THA，最低干态临界负荷由26.84% THA分别推迟至21.12% THA、21.26% THA和21.19% THA。中间点抽汽回热方案对主/再热蒸汽流量的影响最小，能提高蒸汽温度，有利于机组稳定运行，另外两种方案导致参数发生较大波动。炉侧储热回热的㶲效率最高（91.98%），中间点抽汽回热方案次之（89.97%）。综合考虑推迟能力、参数稳定性和回热㶲效率，中间点抽汽回热方案最优。研究结果可为优化超超临界直流锅炉深度调峰运行提供参考。

Abstract

To address the decline in economic efficiency

operational safety

and environmental performance of ultra-supercritical once-through boilers caused by wet mode operation during deep peak-shaving

this paper proposes three boiler-side regenerative heating schemes—namely intermediate-point extraction regenerative heating

main steam extraction regenerative heating

and boiler-side thermal energy storage regenerative heating—to delay the transition to wet mode. A 660 MW ultra-supercritical once-through boiler model is established and validated. The minimum critical loads for wet mode transition and dry-mode operation are determined under the three schemes

the variations in working fluid parameters and heating surface temperature before and after delaying wet mode transition are analyzed

and the exergy efficiencies of the regenerative heating processes are compared. The results indicate that by adopting intermediate-point extraction

main steam extraction

and boiler-side thermal energy storage regenerative heating

the minimum critical load for transition to wet mode can be reduced from 25.67% THA to 19.71% THA

19.84% THA

and 19.77% THA

respectively and the minimum load for dry-mode operation can be reduced from 26.84% THA to 21.12% THA

21.26% THA

and 21.19% THA

respectively. Among the three schemes

intermediate-point extraction regenerative heating exerts the least influence on the main steam and reheat steam flow rates while effectively increasing steam temperature

thereby contributing to stable unit operation. In contrast

the other two schemes cause more pronounced parameter fluctuations. The boiler-side thermal energy storage regenerative heating achieves the highest exergy efficiency (91.98%)

followed by the intermediate-point extraction regenerative heating (89.97%). Considering the delay capability

parameter stability

and regenerative exergy efficiency

the intermediate-point extraction regenerative heating scheme is identified as the optimal approach. The findings of this study can serve as a reference for optimizing deep peak-shaving operations in ultra-supercritical once-through boilers.

关键词

Keywords

references

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