Operation Flexibility and Performance Analysis of Combined Heat and Power Unit Coupled with Molten Salt Heat Storage System

XIE Kai; WANG Qian; SU Zhigang; HAO Yongsheng; WANG Peihong

doi:10.19805/j.cnki.jcspe.2025.240501

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Operation Flexibility and Performance Analysis of Combined Heat and Power Unit Coupled with Molten Salt Heat Storage System

更新时间：2025-11-28

- Operation Flexibility and Performance Analysis of Combined Heat and Power Unit Coupled with Molten Salt Heat Storage System
- Chinese Journal of Power Engineering Vol. 45, Issue 9, Pages: 1546-1556(2025)
- 作者机构：
  
  1. 东南大学能源与环境学院,江苏,南京,211189
  2. 江苏科技大学能源与动力学院,江苏,南京,212100
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240501
  CLC：
- Published Online：16 September 2025，
  
  Published：2025
- 稿件说明：
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谢凯,王乾,苏志刚,郝勇生,王培红. 耦合熔盐蓄热系统的热电联产机组运行灵活性及性能分析动力工程学报, 2025, 45(9): 1546-1556 https://doi.

org/10.19805/j.cnki.jcspe.2025.240501
谢凯,王乾,苏志刚,郝勇生,王培红. 耦合熔盐蓄热系统的热电联产机组运行灵活性及性能分析动力工程学报, 2025, 45(9): 1546-1556 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240501.

org/10.19805/j.cnki.jcspe.2025.240501 DOI：

摘要

热电联产机组以热定电的运行方式限制了其深度调峰能力

熔盐蓄热技术能够提高机组运行灵活性

在一定程度上实现了热电解耦。以耦合可对外供热熔盐蓄热系统的某660 MW热电联产机组为研究对象

提出了一种安全供热运行边界的计算方法

基于该安全域计算分析了解耦与调峰能力的变化

并对储、放热过程中的能量利用效率与效率进行了分析。结果表明:所提出的边界计算方法精确

能够确定耦合系统供热时的电热定值约束;80 MW·h熔盐蓄热系统可提供260 ℃、2 MPa的供热蒸汽最大质量流量为65.92 t/h

提高的深度调峰量最大值为额定负荷的7.56%;能量利用效率随着机组抽汽供热质量流量的增大和发电功率的减小而增大

效率随着抽汽供热质量流量和发电功率的增大而增大

储热功率为最大值(36 MW)时

机组在运行域内的能量利用效率与效率最高

分别为79.78%和46.04%

熔盐放热过程产生的蒸汽质量流量最大时

机组运行域内能量利用效率与效率最高

分别为80.84%和46.33%;在供热质量流量分配时优先释放机组抽汽供热能力再辅以熔盐蓄热系统供热

具有更高的能量利用效率和效率。

Abstract

The "power determined by heat" operation mode constrains the deep peak regulation capacity of combined heat and power units. The molten salt heat storage technique can enhance the operation flexibility of power unit

and achieve the decoupling of heat and power to a certain extent. Taking a 660 MW combined heat and power unit coupled with a molten salt heat storage system that can supply heat as the research object

a calculation method for the safe heating operation boundary was proposed. Based on this safety domain

the changes in decoupling and peak-shaving capabilities were calculated and analyzed

and the energy utilization efficiency and exergy efficiency during the heat storage and release processes were also analyzed. Results show that the proposed boundary calculation method is accurate and can determine the constraints on the fixed values of power and heat when the coupled system supplies heat. The 80 MW·h molten salt heat storage system can provide heating steam at 260 ℃ and 2 MPa with a maximum mass flow rate of 65.92 t/h

and the maximum increase in deep peak-shaving capacity is 7.56% of the rated load. The energy utilization efficiency increases with the increase in the mass flow rate of the unit's extraction steam for heating and the decrease in power generation

while the exergy efficiency increases with the increase in both the mass flow rate of extraction steam for heating and the power generation. When the heat storage power reaches its maximum value (36 MW)

the unit achieves the highest energy utilization efficiency and exergy efficiency within the operation domain

which are 79.78% and 46.04%

respectively. When the mass flow rate of steam generated during the molten salt heat release process is the maximum

the unit's energy utilization efficiency and exergy efficiency within the operation domain reach the highest levels

being 80.84% and 46.33%

respectively. In terms of the distribution of heating mass flow rate

giving priority to utilizing the unit's extraction steam heating capacity and then supplementing with the molten salt heat storage system results in higher energy utilization efficiency and exergy efficiency.

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references

MERAJ S T, YU S S, RAHMAN S, et al. Energy management schemes, challenges and impacts of emerging inverter technology for renewable energy integration towards grid decarbonization[J]. Journal of Cleaner Production, 2023, 405: 137002.

张鹏, 吴昊, 张佳丽, 等. 中国风光大型基地与氢储能高比例耦合发展研究——以"三北"地区为例[J]. 水力发电, 2023, 49(11): 16-23. ZHANG Peng, WU Hao, ZHANG Jiali, et al. Research on high proportion coupling development between large-scale wind power and photovoltaic bases and hydrogen energy storage in China: taking the Three-North regions as example[J]. Water Power, 2023, 49(11): 16-23.

卢勇振. 新形势下煤电机组灵活性改造技术研究[J]. 锅炉技术, 2022, 53(6): 72-76, 80. LU Yongzhen. Research on the flexibility modification technology of coal power units under the new situation[J]. Boiler Technology, 2022, 53(6): 72-76, 80.

李佳佳, 李兴朔, 周国文, 等. 先进储能型燃煤热电联产系统热力特性及灵活性分析[J]. 动力工程学报, 2023, 43(2): 205-213. LI Jiajia, LI Xingshuo, ZHOU Guowen, et al. Thermodynamics and flexibility analysis of a novel coal-fired CHP-CAES system[J]. Journal of Chinese Society of Power Engineering, 2023, 43(2): 205-213.

居文平, 吕凯, 马汀山, 等. 供热机组热电解耦技术对比[J]. 热力发电, 2018, 47(9): 115-121. JU Wenping, LYU Kai, MA Tingshan, et al. Comparison of thermo-electric decoupling techniques for heating units[J]. Thermal Power Generation, 2018, 47(9): 115-121.

LIU Miaomiao, LIU Ming, CHEN Weixiong, et al. Operational flexibility and operation optimization of CHP units supplying electricity and two-pressure steam[J]. Energy, 2023, 263: 125988.

CHEN Binbin, WU Wenchuan, LIN Chenhui, et al. Improving flexibility for microgrids by coordinated optimization of electricity and steam networks[J]. IEEE Transactions on Sustainable Energy, 2021, 12(1): 314-324.

李应保, 罗润洪, 黄杰. 一种"绿电"熔盐储能系统的建模与动态特性研究[J]. 动力工程学报, 2024, 44(3): 455-461. LI Yingbao, LUO Runhong, HUANG Jie. Modeling and dynamic characteristics study of a "green electricity" molten salt energy storage system[J]. Journal of Chinese Society of Power Engineering, 2024, 44(3): 455-461.

ARGYROU M C, CHRISTODOULIDES P, KALOGIROU S A. Energy storage for electricity generation and related processes: technologies appraisal and grid scale applications[J]. Renewable and Sustainable Energy Reviews, 2018, 94: 804-821.

BAUER T, ODENTHAL C, BONK A. Molten salt storage for power generation[J]. Chemie Ingenieur Technik, 2021, 93(4): 534-546.

WEI Haijiao, LU Yuanwei, YANG Yanchun, et al. Research on influence of steam extraction parameters and operation load on operational flexibility of coal-fired power plant[J]. Applied Thermal Engineering, 2021, 195: 117226.

ZHANG Kezhen, LIU Ming, ZHAO Yongliang, et al. Design and performance evaluation of a new thermal energy storage system integrated within a coal-fired power plant[J]. Journal of Energy Storage, 2022, 50: 104335.

冀帅宇, 段立强, 王远慧, 等. 典型燃煤机组灵活调峰策略及性能研究[J]. 热力发电, 2023, 52(9): 94-103. JI Shuaiyu, DUAN Liqiang, WANG Yuanhui, et al. Research on flexible peak load regulation strategy and performance of typical coal-fired units[J]. Thermal Power Generation, 2023, 52(9): 94-103.

王辉, 李峻, 祝培旺, 等. 应用于火电机组深度调峰的百兆瓦级熔盐储能技术[J]. 储能科学与技术, 2021, 10(5): 1760-1767. WANG Hui, LI Jun, ZHU Peiwang, et al. Hundred-megawatt molten salt heat storage system for deep peak shaving of thermal power plant[J]. Energy Storage Science and Technology, 2021, 10(5): 1760-1767.

MIAO Lin, LIU Ming, ZHANG Kezhen, et al. Design and performance evaluation of thermal energy storage system with hybrid heat sources integrated within a coal-fired power plant[J]. Journal of Energy Storage, 2024, 82: 110611.

MA Tingshan, LI Zhengkuan, LV Kai, et al. Design and performance analysis of deep peak shaving scheme for thermal power units based on high-temperature molten salt heat storage system[J]. Energy, 2024, 288: 129557.

LI Bo, CAO Yue, HE Tianyu, et al. Thermodynamic analysis and operation strategy optimization of coupled molten salt energy storage system for coal-fired power plant[J]. Applied Thermal Engineering, 2024, 236: 121702.

张宇恒, 宋晓辉, 杨荣贵, 等. 基于再热蒸汽抽汽-熔盐储热的火电系统分析[J]. 动力工程学报, 2024, 44(3): 447-454. ZHANG Yuheng, SONG Xiaohui, YANG Ronggui, et al. Performance of molten salt thermal energy storage system based on reheat steam extraction from coal-fired power plants[J]. Journal of Chinese Society of Power Engineering, 2024, 44(3): 447-454.

ZHANG Kezhen, LIU Ming, ZHAO Yongliang, et al. Thermo-economic optimization of the thermal energy storage system extracting heat from the reheat steam for coal-fired power plants[J]. Applied Thermal Engineering, 2022, 215: 119008.

LUO Haihua, SHEN Qiang, CHEN Yunfei, et al. Thermodynamic performance of molten salt heat storage system used for regulating load and supplying high temperature steam in coal-fired cogeneration power plants[J]. E3S Web of Conferences, 2020, 194: 01034.

TANG Haiyu, LIU Ming, ZHANG Kezhen, et al. Performance evaluation and operation optimization of a combined heat and power plant integrated with molten salt heat storage system[J]. Applied Thermal Engineering, 2024, 245: 122848.

HU Wenting, SUN Ruiqiang, ZHANG Kezhen, et al. Thermoeconomic analysis and multiple parameter optimization of a combined heat and power plant based on molten salt heat storage[J]. Journal of Energy Storage, 2023, 72: 108698.

HERRMANN U, KELLY B, PRICE H. Two-tank molten salt storage for parabolic trough solar power plants[J]. Energy, 2004, 29(5/6): 883-893.

KHALEEL O J, IBRAHIM T K, ISMAIL F B, et al. Modeling and analysis of optimal performance of a coal-fired power plant based on exergy evaluation[J]. Energy Reports, 2022, 8: 2179-2199.

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