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Journal of Thermal Science

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2025 , Vol. 34 >Issue 5: 1841 - 1856

DOI: https://doi.org/10.1007/s11630-025-2151-0

A Comprehensive Energy Saving Potential Analysis of a 660 MW Coal-Fired Ultra-Supercritical Power Plant

  • YE Nina ,
  • ZHANG Qichao ,
  • LI Zixiang ,
  • XU Jiaye ,
  • WU Xiaojiang ,
  • ZHANG Zhongxiao ,
  • YAN Kai
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  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Department of Research and Development, Shanghai Boiler Works Co., Ltd., Shanghai 200245, China

网络出版日期: 2025-09-01

基金资助

This work was supported by the National Key Research and Development Program of China (2022YFB2403200) and 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 2025
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A Comprehensive Energy Saving Potential Analysis of a 660 MW Coal-Fired Ultra-Supercritical Power Plant

  • YE Nina ,
  • ZHANG Qichao ,
  • LI Zixiang ,
  • XU Jiaye ,
  • WU Xiaojiang ,
  • ZHANG Zhongxiao ,
  • YAN Kai
Expand
  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Department of Research and Development, Shanghai Boiler Works Co., Ltd., Shanghai 200245, China

Online published: 2025-09-01

Supported by

This work was supported by the National Key Research and Development Program of China (2022YFB2403200) and 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 2025
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摘要

本研究以660 MWe超超临界燃煤机组为对象，从节能视角系统评估了机组的热力性能。通过构建㶲分析模型，定量揭示了回热系统㶲损分布特征与设备能效水平。研究发现高压加热器㶲损高达3.03 MWth，采用外置蒸汽冷却器可有效降低其㶲损失。进一步分析了宽负荷下不同配置的节能潜力。针对不同余热利用配置的对比研究表明，烟气余热回收方案不仅改变了回热系统㶲损失分布，更重要的是减少了高品位抽汽需求，从而提升了机组发电能力。最优配置方案通过高/低温热源分级加热给水的余热梯级利用方式，实现机组发电标准煤耗降至253.39 g/(kW·h)，较基准机组降低1.27%；额定工况下发电功率提升5.99 MWe，40%THA工况时煤耗率降低0.97%。此外，本研究还探讨了汽轮机性能退化对机组热性能的不利影响，为维护和优化热力系统的性能提供了重要理论依据。

关键词： ultra-supercritical power plant; regenerative heating system; exergy analysis; sensitivity analysis; waste heat utilization

本文引用格式

YE Nina , ZHANG Qichao , LI Zixiang , XU Jiaye , WU Xiaojiang , ZHANG Zhongxiao , YAN Kai . A Comprehensive Energy Saving Potential Analysis of a 660 MW Coal-Fired Ultra-Supercritical Power Plant[J]. 热科学学报, 2025 , 34(5) : 1841 -1856 . DOI: 10.1007/s11630-025-2151-0

Abstract

This work focuses on evaluating the performance of a 660 MW ultra-supercritical power plant from the perspective of energy saving ability. By conducting the exergy analysis, the exergy loss distribution and the efficiency of regenerators are thoroughly measured. The results show that the exergy loss of a high-pressure regenerative heater can be as high as 3.03 MW. Thus, installing outer steam coolers can reduce the exergy loss of high-pressure regenerative heaters. The energy saving potential of different configurations across wide load conditions is further analyzed. These analyses reveal that the flue gas waste heat utilization configurations not only alter the exergy loss distribution in the regenerative heating system but also reduce the need for high-grade extraction steam, thereby enhancing the unit’s power generation capacity. Based on the proposed optimal configuration, the gas-water heaters with high-temperature and low-temperature heat sources are utilized to heat the corresponding feed water, enabling a cascade utilization of waste heat. This approach minimizes the standard coal consumption for power generation of the unit to 253.39 g·(kW·h)–1, 1.27% lower than the reference unit. Under rated conditions, the power generation increases by 5.99 MW. Under 40% THA condition, this configuration exhibits significant energy-saving benefits with a 0.97% reduction in coal consumption rate. Furthermore, the study has delved into the impact of turbine degradation, which is found to adversely affect the thermal performance of the power unit. This revelation provides crucial insights into maintaining and optimizing the performance of the thermal system.

Key words： ultra-supercritical power plant; regenerative heating system; exergy analysis; sensitivity analysis; waste heat utilization

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