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

MIAO Lin; LIU Ming; PAN Donghui; LI Youxia; TANG Haojie; ZHAO Qing; YAN Junjie

doi:10.19805/j.cnki.jcspe.2025.240431

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

更新时间：2026-10-10

- Thermodynamic Performance Evaluation of Coal-fired Units Integrated with Power-to-Heat Molten Salt Thermal Energy Storage System
- Chinese Journal of Power Engineering Vol. 45, Issue 8, Pages: 1337-1344(2025)
- 作者机构：
  
  1. 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
  2. 东方电气集团东方锅炉股份有限公司,四川,自贡,643001
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240431
  CLC：
- Online First：12 August 2025，
  
  Published：2025
- 稿件说明：
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苗林,刘明,潘东晖,李有霞,唐豪杰,赵庆,严俊杰. 燃煤机组集成电制热熔盐储热系统的热力学性能分析动力工程学报, 2025, 45(8): 1337-1344 https://doi.

org/10.19805/j.cnki.jcspe.2025.240431
苗林,刘明,潘东晖,李有霞,唐豪杰,赵庆,严俊杰. 燃煤机组集成电制热熔盐储热系统的热力学性能分析动力工程学报, 2025, 45(8): 1337-1344 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240431.

org/10.19805/j.cnki.jcspe.2025.240431 DOI：

摘要

为了提升燃煤机组的运行灵活性

设计了利用电加热熔盐蓄热并采用附加汽轮机释热的熔盐储热系统

包括方案A(附加汽轮机排汽进凝汽器)和方案B(附加汽轮机排汽进除氧器)

结合了某660 MW超临界燃煤机组案例对集成系统的热力学性能进行分析。结果表明:在方案B中

机组最大净输出功率增量为额定负荷的9.67%

而在方案A中

机组净输出功率增量为额定负荷的11.04%;在最大的锅炉给水分流流量条件下

方案A和B的全厂能量效率由43.61%分别降低至43.05%和42.81%

而其全厂效率可由42.83%分别增加至44.90%和44.47%;当锅炉给水分流质量流量小于60 kg/s时

方案B的等效往返效率高于方案A

最大值为48.47%。

Abstract

To enhance the operational flexibility of coal-fired power plants

a molten salt thermal energy storage system that utilizes electric heaters for heat storage and an additional steam turbine for heat release

including heat release schemes A (additional steam turbine exhaust entering the condenser) and B (additional steam turbine exhaust entering the deaerator)

were designed. The thermodynamic performance of the integrated system was analyzed based on a 660 MW supercritical coal-fired power plant (CFPP) case study. Results show that in scheme B

the maximum net output power increment of the CFPP is 9.67% of the rated load

while in scheme A

the net output power increment of the CFPP is 11.04% of the rated load. Under the condition of maximum boiler feedwater split mass flow rate

the total energy efficiency of schemes A and B decreases from 43.61% to 43.05% and 42.81%

respectively

while their total energy efficiencies could increase from 42.83% to 44.90% and 44.47%

respectively. When boiler feedwater split mass flow rate is less than 60 kg/s

the equivalent round-trip efficiency of scheme B is higher than that of scheme A

with a maximum value of 48.47%.

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references

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