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
陈庆伟(1995),男,硕士,工程师,研究方向为燃煤机组灵活高效发电,18246032075@163.com;
李安喆(1998),男,博士研究生,研究方向为太阳能光热发电与燃煤电站耦合,18801133375@163.com;
翟融融(1985),女,博士,教授,研究方向为太阳能热与燃煤电站耦合、燃煤机组低碳与灵活性,本文通信作者,zhairongrong01@163.com;
王鹏(1981),男,博士,正高级工程师,研究方向为灵活智能燃煤发电,16810107@ceic.com.cn;
吴瑞涵(2002),男,硕士研究生,研究方向为燃煤机组低碳高效灵活协同提升技术,19859868917@163.com。
收稿:2026-06-01,
修回:2026-08-30,
网络首发:2026-09-30,
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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.
目的
2
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
2
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
2
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
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。
Objectives
2
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
2
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
2
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
2
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.
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