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Study on thermodynamic performance of a 300 MW supercritical carbon dioxide Brayton cycle oxyfuel generating unit
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Zhiyu ZHANG1, 2, Bo ZHANG1, 2, Long QIN1, 2, Haihui SONG1, 2, Lin ZHU1, 2, Zhuonan XIAO1, 2, Shengjie WANG3
Thermal Power Generation | 2025, 54(10) : 73 - 81
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Thermal Power Generation | 2025, 54(10): 73-81
• Thermal energy science research •
Study on thermodynamic performance of a 300 MW supercritical carbon dioxide Brayton cycle oxyfuel generating unit
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Zhiyu ZHANG1, 2, Bo ZHANG1, 2, Long QIN1, 2, Haihui SONG1, 2, Lin ZHU1, 2, Zhuonan XIAO1, 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: 2025-10-25 doi: 10.19666/j.rlfd.202412266
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A 300 MW supercritical carbon dioxide (S-CO2) Brayton cycle oxyfuel power generation system is designed, and a simulation model is constructed using process simulation methods to study the effects of key operating parameters (such as the primary dry cycle flue gas ratio, the economizer side split ratio, the cold primary air temperature and the high-pressure turbine inlet pressure) on the system’s thermal performance indexes. The effects of key operating parameters such as primary dry cycle flue gas ratio, economizer side split ratio, cold primary air temperature and high-pressure turbine inlet pressure on the system thermodynamics were investigated, and the thermal characteristics of the generating unit were revealed. The results show that, the boiler efficiency decreases with the increase of the proportion of primary dry-cycle flue gas, and when the proportion of primary dry-cycle flue gas reaches 50%, the net electric efficiency of the system is the highest, which is 42.93%. The boiler efficiency rises at first and then decreases with the increase of the coal economizer-side shunt ratio, and the net electric efficiency of the system reaches the highest (42.86%) when the coal economizer-side shunt ratio is 11%. With the increase of cold primary air temperature, the boiler efficiency keeps increasing, and the rising trend slows down and stabilizes at 99.29% at temperatures higher than 65 ℃, and the net electric efficiency of the system keeps increasing and reaches 43.06% at 95 ℃. With the increase of high-pressure turbine inlet pressure, the boiler efficiency firstly rises and then decreases, and reaches the maximum value of 99.35% at 29.5 MPa, and the net electric efficiency of the system reaches the optimal value (43.66%) at 29.0 MPa.

supercritical carbon dioxide  /  oxyfuel combustion  /  thermal property  /  operating parameters optimization
Zhiyu ZHANG, Bo ZHANG, Long QIN, Haihui SONG, Lin ZHU, Zhuonan XIAO, Shengjie WANG. Study on thermodynamic performance of a 300 MW supercritical carbon dioxide Brayton cycle oxyfuel generating unit[J]. Thermal Power Generation, 2025 , 54 (10) : 73 -81 . DOI: 10.19666/j.rlfd.202412266
Funding
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  • Inner Mongolia Natural Science Foundation(2022MS05036)
  • Basic Research Operating Expenses Program for Colleges and Universities Directly under the 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 2025 volume 54 Issue 10
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115
49
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Article Info
doi: 10.19666/j.rlfd.202412266
  • Receive Date：2024-12-17
  • Online Date：2026-03-05
  • Published：2025-10-25
Article Data
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History
  • Received：2024-12-17
Funding
Inner Mongolia Natural Science Foundation(2022MS05036)
Basic Research Operating Expenses Program for Colleges and Universities Directly under the 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.202412266
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