Design of a cascaded thermal-storage-integrated system and fundamental research on its frequency-regulation performance

丁煊涛; 范庆伟

doi:10.19666/j.rlfd.202508050

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Design of a cascaded thermal-storage-integrated system and fundamental research on its frequency-regulation performance

Thermal Power Generation Vol. 55, Issue 2, Pages: 108-116(2026)

更新时间：2026-08-07

- Design of a cascaded thermal-storage-integrated system and fundamental research on its frequency-regulation performance
- 作者机构：
  
  1. 北方联合电力有限责任公司
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202508050
  CLC： TM621
- Published：2026
- 稿件说明：
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[1]丁煊涛,范庆伟.梯级火储集成系统设计及其调频基础研究[J].热力发电,2026,55(02):108-116.
[1]丁煊涛,范庆伟.梯级火储集成系统设计及其调频基础研究[J].热力发电,2026,55(02):108-116. DOI： 10.19666/j.rlfd.202508050.

DOI：10.19666/j.rlfd.202508050.

摘要

【目的】在全球能源结构转型与“双碳”战略目标驱动下，提升火电机组灵活性已成为增强电网新能源消纳能力的关键路径。为提升火电机组调频灵活性并解决熔盐-蒸汽换热过程中的夹点问题，提出一种与亚临界机组耦合的三罐式梯级熔盐储热集成方案。【方法】基于EBSILON平台构建了330 MW机组稳态模型，并嵌入高-中-低温熔盐储释热回路，通过主蒸汽及给水旁路实现锅炉-汽轮机部分解耦。【结果】仿真结果表明：该系统循环电效率在100%THA工况下可达63.51%；集成系统在各工况的热备用工作状态下热耗率增幅仅约1%，而在40%THA、5%Pe调频深度下为13.2%；调频引发的煤耗增量随调频深度加大呈指数增长，为界定经济性运行死区提供了依据。【结论】该梯级储热结构在维持蒸汽品位的同时，显著提升了机组负荷响应速率与调频能力，为高比例新能源电力系统中火电机组的灵活性改造提供了理论支撑与工程设计范式。

Abstract

[Objective] Driven by the global energy transition and the “dual-carbon” goals

enhancing the operational flexibility of coal-fired units has become pivotal for improving the grid's renewable energy accommodation capacity. To enhance the frequency-regulation flexibility of coal-fired units and address the pinch-point bottleneck in molten-salt/steam heat exchange

this study proposes a three-tank cascaded thermal energy storage(TES) system integrated with a subcritical unit. [Methods] A steady-state model of a 330 MW unit was developed in EBSILON. It incorporated high-

intermediate-

and low-temperature molten-salt loops

and achieved partial boiler-turbine decoupling via main-steam and feedwater bypass circuits. [Results] The simulation results indicate that the cycle electric efficiency reached 63.51% at 100% THA; the heat rate increase of the integrated system was about 1% in hot standby working state of each working condition

and 13.2% at 40% THA with a 5% Pe regulation depth; the coal consumption penalty grew exponentially with regulation depth

providing a basis for defining an economic dead band. [Conclusion] The cascaded TES structure preserves steam exergy while significantly improving loadresponse rate and frequency-regulation capability

offering both theoretical insights and a practical design paradigm for flexibility retrofits of coal-fired units in power systems with high renewable penetration.

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references

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