Flexible Regenerative Heating System Retrofit and Thermal Economic Performance of Ultra-Supercritical Coal-Fired Units under Deep Peak Shaving

CHEN Qingwei; LI Anzhe; ZHAI Rongrong; WANG Peng; WU Ruihan

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Flexible Regenerative Heating System Retrofit and Thermal Economic Performance of Ultra-Supercritical Coal-Fired Units under Deep Peak Shaving

更新时间：2026-09-30

- Flexible Regenerative Heating System Retrofit and Thermal Economic Performance of Ultra-Supercritical Coal-Fired Units under Deep Peak Shaving
- Power Generation Technology Pages: 1-14(2026)
- 作者机构：
  
  1.国家能源集团新能源技术研究院有限公司灵活发电技术研究中心，北京市昌平区 102209
  2.华北电力大学能源动力与机械工程学院，北京市昌平区 102206
  3.华北电力大学新能源学院，北京市昌平区 102206
- 作者简介：
- 基金信息：
  
  National Key Research & Development Program(2022YFB4202404);Science and Technology Innovation Project of China Energy Investment Group(GJNY-23-69)
- DOI：
  CLC： TK 11;TM 61
- Received：01 June 2026，
  
  Revised：2026-08-30，
  
  Online First：30 September 2026，
- 稿件说明：
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陈庆伟,李安喆,翟融融等.深度调峰背景下超超临界燃煤机组柔性回热系统改造与热经济性研究[J].发电技术,

CHEN Qingwei,LI Anzhe,ZHAI Rongrong,et al.Flexible Regenerative Heating System Retrofit and Thermal Economic Performance of Ultra-Supercritical Coal-Fired Units under Deep Peak Shaving[J].Power Generation Technology,
陈庆伟,李安喆,翟融融等.深度调峰背景下超超临界燃煤机组柔性回热系统改造与热经济性研究[J].发电技术, DOI：10.12096/j.2096-4528.pgt.01.

CHEN Qingwei,LI Anzhe,ZHAI Rongrong,et al.Flexible Regenerative Heating System Retrofit and Thermal Economic Performance of Ultra-Supercritical Coal-Fired Units under Deep Peak Shaving[J].Power Generation Technology, DOI：10.12096/j.2096-4528.pgt.01.

摘要

目的

针对超超临界燃煤机组深度调峰、宽负荷运行中存在的二次风加热不足、回热能量分配改变和热经济性劣化等问题，开展柔性回热系统重构及二次风加热改造方案的性能评价研究。

方法

以某1 000 MW超超临界燃煤机组为研究对象，基于EBSILON热力仿真软件搭建原系统及2种改造方案的热力计算模型，分析15%汽轮机热耗验收工况(turbine heat acceptance，THA)~40% THA低负荷区和50% THA~100% THA中高负荷区机组的二次风温度、排烟温度、蒸汽流量、换热量、热耗率和煤耗等关键参数变化规律。

结果

原系统在低负荷区二次风温度持续下降，排烟温度升高，热经济性劣化加快；低负荷区采用过热蒸汽引射冷再热蒸汽进行补热，可使二次风温度提升11.787~33.876 ℃，煤耗改善率达2.662%~10.694%，但锅炉效率有所下降，排烟温度升高。中高负荷区采用第三级抽汽补热，可使二次风温度提升10.266~12.331 ℃，但部分给水回热量用于二次风加热，机组热耗率和煤耗会小幅上升。

结论

2种改造方案通过不同热力系统重构路径，实现了二次风温度调节与回热能量再分配，对提升超超临界机组宽负荷运行适应性、支撑机组深度调峰改造具有重要意义。研究结果可为二次风加热系统优化及分区投运策略制定提供参考。

Abstract

Objectives

In deep peak shaving and wide-load operation of ultra-supercritical coal-fired units

insufficient secondary-air heating

redistribution of regenerative heat

and deterioration of thermal economic performance may occur. To address these issues

this study evaluates flexible regenerative heating system reconstruction and secondary-air heating retrofit schemes.

Methods

A 1 000 MW ultra-supercritical coal-fired unit is selected as the research object

and thermal calculation models of the original system and two retrofit schemes are established based on EBSILON thermal simulation software. The variation patterns of key parameters including secondary-air temperature

exhaust gas temperature

steam flow rate

heat duty

heat rate

and coal consumption are analyzed in the low-load range of 15% turbine heat acceptance (THA) to 40% THA and the medium- and high-load range of 50% THA to 100% THA.

Results

In the original system

the secondary-air temperature continuously decreases in the low-load range

while the exhaust gas temperature increases

accelerating the deterioration of thermal economic performance. In the low-load range

superheated steam is used to entrain cold reheat steam for supplementary heating

increasing the secondary-air temperature by 11.787-33.876 ℃

with a coal consumption improvement rate of 2.662%-10.694%

although the boiler efficiency decreases and the exhaust gas temperature increases. In the medium- and high-load range

third-stage extraction steam is used for supplementary heating

increasing the secondary-air temperature by 10.266-12.331 ℃. However

the unit heat rate and coal consumption increase slightly because part of the feedwater regenerative heat is used for secondary-air heating.

Conclusions

The two retrofit schemes achieve secondary-air temperature regulation and regenerative heat redistribution through different thermal system reconstruction paths

which is of great significance for improving the wide-load operation adaptability of ultra-supercritical units and supporting deep peak shaving retrofit. The findings can provide a reference for secondary-air heating system optimization and zonal operation strategy formulation.

关键词

Keywords

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