Thermodynamic Performance Study on Coal-fired Power Plant Integrated with Molten Salt Thermal Energy Storage System

YANG Haisheng; WU Ruitao; LI Lujiang; TANG Guangtong; MIAO Lin; LIU Ming

doi:10.19805/j.cnki.jcspe.2025.240141

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Thermodynamic Performance Study on Coal-fired Power Plant Integrated with Molten Salt Thermal Energy Storage System

更新时间：2025-10-16

- Thermodynamic Performance Study on Coal-fired Power Plant Integrated with Molten Salt Thermal Energy Storage System
- Chinese Journal of Power Engineering Vol. 45, Issue 5, Pages: 645-653(2025)
- 作者机构：
  
  1. 国网河北能源技术服务有限公司,河北,石家庄,050021
  2. 河北省火力发电节能环保技术创新中心,河北,石家庄,050021
  3. 西安交通大学动力工程多相流国家重点实验室,陕西,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240141
  CLC： TM621
- Published Online：19 May 2025，
  
  Published：2025
- 稿件说明：
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杨海生,吴瑞涛,李路江,唐广通,苗林,刘明. 燃煤机组集成储热系统的热力学性能研究动力工程学报, 2025, 45(5): 645-653 https://doi.

org/10.19805/j.cnki.jcspe.2025.240141
杨海生,吴瑞涛,李路江,唐广通,苗林,刘明. 燃煤机组集成储热系统的热力学性能研究动力工程学报, 2025, 45(5): 645-653 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240141.

org/10.19805/j.cnki.jcspe.2025.240141 DOI：

摘要

为了提高利用过热蒸汽加热熔盐进行储热的系统能效

建立了集成三罐熔盐储热系统的燃煤机组系统构型

并在典型储热-放热工况下对燃煤机组的灵活性提升潜力和集成系统的热力学性能进行分析。结果表明:在30% THA工况下进行储热时

受汽轮机低压缸的最低蒸汽通流量限制

燃煤机组的输出功率最高可降低81.60 MW

占机组额定负荷的12.36%;而在50% THA工况下放热时

燃煤机组的输出功率最高可达52.45 MW

占机组额定负荷的7.95%;集成系统的等效循环效率受放热基准工况的影响

在50% THA工况下放热时的等效循环效率最大

可达75.35%

而在100% THA工况放热时的等效循环效率最小

为59.43%。

Abstract

To enhance the energy efficiency of the thermal energy storage system using superheated steam to heat molten salt

a coal-fired unit system configuration integrating the three-tank molten salt thermal energy storage system was proposed. The flexibility improvement potential of coal-fired power plant and the thermodynamic performance of the integrated system were analyzed under typical charging and discharging conditions. Results show that under the condition of 30% THA for the charging process

the maximum output power of coal-fired power plant can be reduced by 81.60 MW

accounting for 12.36% of the rated load

due to the limitation of the minimum steam flow rate through the low-pressure turbine. Under the condition of 50% THA for the discharging process

the maximum output power of coal-fired power plant can be increased to 52.45 MW

accounting for 7.95% of the rated load. The equivalent round-trip efficiency of the integrated system is influenced by the discharging condition. The maximum equivalent round-trip efficiency is 75.35% at the discharging condition of 50% THA

while the minimum equivalent round-trip efficiency is achieved at 59.43% at the discharging condition of 100% THA.

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references

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Thermodynamic Performance Evaluation of Coal-fired Units Integrated with Power-to-Heat Molten Salt Thermal Energy Storage System

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