System Performance Analysis of a Coal-fired Unit Coupled with High- and Low-temperature Molten Salt Thermal Energy Storage

ZHENG Lei; LIU Yulin; ZHONG Ping; CAO Shoufeng; XU Kai; SHAN Shaorong; NIU Zesen; XUE Xiaojun

doi:10.19805/j.cnki.jcspe.2026.250350

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System Performance Analysis of a Coal-fired Unit Coupled with High- and Low-temperature Molten Salt Thermal Energy Storage

更新时间：2026-07-16

- System Performance Analysis of a Coal-fired Unit Coupled with High- and Low-temperature Molten Salt Thermal Energy Storage
- Chinese Journal of Power Engineering Vol. 46, Issue 7, Pages: 205-214(2026)
- 作者机构：
  
  1. 西安热工研究院有限公司苏州分公司,江苏,苏州,215353
  2. 山西大学电力与建筑学院,山西,太原,030006
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2026.250350
  CLC： TK221
- Published：2026
- 稿件说明：
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郑磊, 刘钰林, 钟平, 曹寿峰, 徐凯, 单绍荣, 牛泽森, 薛小军. 高低温熔盐储热耦合燃煤机组的系统性能分析[J]. 动力工程学报, 2026, 46(7): 205-214.
郑磊, 刘钰林, 钟平, 曹寿峰, 徐凯, 单绍荣, 牛泽森, 薛小军. 高低温熔盐储热耦合燃煤机组的系统性能分析[J]. 动力工程学报, 2026, 46(7): 205-214. DOI： 10.19805/j.cnki.jcspe.2026.250350.

DOI： 10.19805/j.cnki.jcspe.2026.250350

摘要

为有效提高燃煤机组的调峰性能和运行灵活性

本文提出了一种将燃煤机组与高/低温熔盐储热相结合的方案。在储能过程中

采用高温熔盐(太阳盐)和低温熔盐(Hitec盐)依次储存燃煤机组中主蒸汽和再热蒸汽的热能

同时采用电加热器再次提高熔盐的温度。在释能过程中

采用高温熔盐加热给水至主蒸汽状态

采用低温熔盐加热给水泵出口给水至最终给水状态。结果表明:燃煤机组的峰值范围可扩展至14.25%THA~108.03%THA

储能系统的等效往返效率可达50.95%;集成系统的效率为34.70%;此外

熔盐储热系统的总投资成本为15 166.34万元

动态投资回收期为3.36 a。

Abstract

To effectively improve the peak-shaving performance and operational flexibility of coal-fired units

a scheme that combines a coal-fired unit with high- and low-temperature molten salt thermal energy storage was proposed. During the energy storage process

high-temperature molten salt (solar salt) and low-temperature molten salt (Hitec salt) were sequentially used to store the thermal energy of the main steam and reheat steam from the coal-fired unit

while the electric heater was employed to further increase the temperature of the molten salt. During the energy release process

high-temperature molten salt was used to heat the feedwater to main steam conditions

and low-temperature molten salt was used to heat the feedwater at the feedwater pump outlet to final feedwater conditions. Results show that the peak range of the coal-fired unit can be increased to 14.25%THA-108.03%THA

and the equivalent round-trip efficiency of the energy storage system can reach 50.95%. The exergy efficiency of the integrated system is 34.70%. Furthermore

the total investment cost of the molten salt thermal energy storage system is 151.663 4 million CNY

with a dynamic payback period of 3.36 a.

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references

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