Thermodynamic performance study of coal-fired power unit integrating geothermal energy and BEST

YU Xinxing; CHEN Zhewen; ZHANG Yuming; ZHANG Wei; LI Jiazhou

doi:10.11949/0438-1157.20260620

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Thermodynamic performance study of coal-fired power unit integrating geothermal energy and BEST

更新时间：2026-07-31

- Thermodynamic performance study of coal-fired power unit integrating geothermal energy and BEST
- CIESC Journal (2026)
- 作者机构：
  
  中国石油大学（北京）重质油国家重点实验室，北京102249
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20260620
  CLC： TK 123
- Received：30 April 2026，
  
  Revised：2026-07-30，
  
  Accepted：31 July 2026，
- 稿件说明：
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YU Xinxing, CHEN Zhewen, ZHANG Yuming, et al. Thermodynamic performance study of coal-fired power unit integrating geothermal energy and BEST[J/OL]. CIESC Journal, 2026.
DOI：

YU Xinxing, CHEN Zhewen, ZHANG Yuming, et al. Thermodynamic performance study of coal-fired power unit integrating geothermal energy and BEST[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260620.

摘要

面向煤电深度调峰与低碳转型需求，探究背压抽汽式汽轮机（Back Pressure Extraction Steam Turbine

BEST）耦合中低温地热预热的协同优化机理。以1000MW超超临界二次再热机组为对象，建立全工况热力学仿真模型，对比评估BEST改造下完全替代低压回热加热器与部分凝水独立加热两种方案。结果表明：BEST的加入使额定工况煤耗降低1.33g/(kW· h)，40%THA工况降幅达3.33g/(kW· h)。部分凝水独立加热方案在100–200kg/s地热流量下可实现3.0–4.7g/(kW· h)节煤收益，资源适应性优于完全替代方案。地热预热器㶲效率随地热温度升高而下降，中低温地热因传热温差匹配更优而具有更高㶲效率。40%THA时200℃地热所需流量仅为额定工况的31%，节煤效果达7.24g/(kW· h)。耦合系统通过“高压能级提升+低压品位替代”降低锅炉热负荷，为煤电机组低碳化改造提供了参考。

Abstract

Addressing the needs of deep peak shaving and low-carbon transition in coal-fired power plants

this study explores the synergistic optimization mechanism of a Back Pressure Extraction Steam Turbine (BEST) coupled with medium- and low-temperature geothermal preheating. This paper establishes a full-condition thermodynamic simulation model for a 1000 MW ultra-supercritical double-reheat unit to compare and evaluate two geothermal integration schemes under the BEST retrofit: completely replacing the low-pressure regenerative heaters with geothermal heat

and independently heating a portion of the condensate with geothermal heat. Results show that the BEST integration reduces the coal consumption rate by 1.33 g/(kW· h) under rated conditions and by up to 3.33 g/(kW· h) at 40 % THA load. The scheme with partial condensate independently heated reduces the coal consumption rate by 3.0–4.7 g/(kW· h) with geothermal flow rates of 100–200 kg/s

demonstrating better resource adaptability than the full replacement scheme. The exergy efficiency of the geothermal preheater decreases with rising geothermal temperature; medium- and low-temperature geothermal sources yield higher exergy efficiency due to better matching of heat transfer temperature differences. At 40 % THA

the required geothermal flow at 200 °C is only 31 % of that at rated conditions

yet the reduction in coal consumption rate reaches 7.24 g/(kW· h). By leveraging the principle of ‘enhancing high-pressure energy and replacing low-pressure energy’

the coupled system reduces the boiler heat load

providing a reference for the low-carbon retrofit of coal-fired power units.

关键词

Keywords

references

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