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Thermodynamic characteristics and economic study of a 600 MW oxyfuel coal-fired unit integrated with compressed air energy storage
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Zhiyu ZHANG1, 2, Haihui SONG1, 2, Bo ZHANG1, 2, Long QIN1, 2, Shengjie WANG3
Thermal Power Generation | 2026, 55(2) : 117 - 127
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Thermal Power Generation | 2026, 55(2): 117-127
• Peak shaving and frequency regulation technology for energy storage system coupled with thermal power unit •
Thermodynamic characteristics and economic study of a 600 MW oxyfuel coal-fired unit integrated with compressed air energy storage
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Zhiyu ZHANG1, 2, Haihui SONG1, 2, Bo ZHANG1, 2, Long QIN1, 2, Shengjie WANG3
Affiliations
  • 1.School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014017, China
  • 2.Integrated Research Large Platform for Comprehensive Utilization Technologies of New Important Energy, Baotou 014017, China
  • 3.School of Economics, Minzu University of China, Beijing 100081, China
Published: 2026-02-25 doi: 10.19666/j.rlfd.202505101
Outline
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[Objective]

This paper aims to reduce carbon emissions and enhance the operational flexibility of coal-fired power units.

[Methods]

A coupled system integrating compressed air energy storage (CAES) with oxygen-enriched coal-fired units was proposed based on energy complementary utilization principles. Various coupling schemes were proposed, and the thermodynamic performance and economic feasibility of the integrated system were analyzed.

[Results]

The results show that by replacing steam turbine extraction with flue gas waste heat to preheat the turbine inlet air, when the heat exchange efficiency of HE1–HE3 is 89% and turbine inlet temperature is raised to 115 ℃, the round-trip efficiency of the CAES system can reach a maximum of 74.33%, representing a 24.25% improvement over the standalone CAES system. When carbon allowances, CO2 revenue, and carbon taxes are considered, the coupled system achieves a static payback period of 11.256 years, shorter than that of the conventional unit. In this case, the net present value (NPV) and internal rate of return (IRR) reach 801.73 million yuan and 9.63%, respectively, both exceeding those of the conventional system, indicating better economic performance. Carbon taxes increase the levelized cost of electricity (βLCOE) of the coupled unit, while carbon allowance trading and CO2 sales significantly reduce the βLCOE. The βLCOE of the coupled unit becomes lower than that of the conventional unit when the carbon tax, carbon allowance price, and CO2 price exceed 6.4 yuan/t, 73.9 yuan/t, and 14.68 yuan/t, respectively. Sensitivity analysis reveals that coal price has the greatest impact on the economic performance of the coupled unit, followed by the carbon allowance price, CO2 price, and carbon tax.

[Conclusion]

The proposed low-carbon pathway for the deep integration of thermal power and energy storage offers theoretical and engineering guidance for promoting low-carbon emissions from coal-fired power units and accelerating their transition into flexible, dispatchable power sources under the framework of a new power system.

advanced adiabatic compressed air energy storage  /  oxyfuel combustion  /  thermodynamic characteristics  /  economic analysis
Zhiyu ZHANG, Haihui SONG, Bo ZHANG, Long QIN, Shengjie WANG. Thermodynamic characteristics and economic study of a 600 MW oxyfuel coal-fired unit integrated with compressed air energy storage[J]. Thermal Power Generation, 2026 , 55 (2) : 117 -127 . DOI: 10.19666/j.rlfd.202505101
Funding
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  • Inner Mongolia Natural Science Foundation(2022MS05036)
  • Basic Scientific Research Operating Expenses Program of Universities Directly Under Inner Mongolia Autonomous Region(2023QNJS141)
  • Key Research and Development and Achievement Transformation Program of Inner Mongolia Autonomous Region(2025YFHH0099)
Appendix
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Year 2026 volume 55 Issue 2
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204
99
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Article Info
doi: 10.19666/j.rlfd.202505101
  • Receive Date：2025-05-15
  • Online Date：2026-08-14
  • Published：2026-02-25
Article Data
Affiliations
History
  • Received：2025-05-15
  • Revised：2025-07-04
  • Accepted：2025-07-11
Funding
Inner Mongolia Natural Science Foundation(2022MS05036)
Basic Scientific Research Operating Expenses Program of Universities Directly Under Inner Mongolia Autonomous Region(2023QNJS141)
Key Research and Development and Achievement Transformation Program of Inner Mongolia Autonomous Region(2025YFHH0099)
Affiliations
    1.School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014017, China
    2.Integrated Research Large Platform for Comprehensive Utilization Technologies of New Important Energy, Baotou 014017, China
    3.School of Economics, Minzu University of China, Beijing 100081, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202505101
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