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Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux
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Bingguo ZHU1, Kaigang GONG1, Xiaoliang YANG1, 2, Bin PENG1, Baokun YANG1
Thermal Power Generation | 2023, 52(6) : 45 - 51
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Thermal Power Generation | 2023, 52(6): 45-51
• Fundamental research on fluid characteristics of S-CO2 cycle •
Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux
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Bingguo ZHU1, Kaigang GONG1, Xiaoliang YANG1, 2, Bin PENG1, Baokun YANG1
Affiliations
  • 1.School of Mechanical & Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • 2.Lanshi Petroleum Equipment Engineering Co., Ltd., Lanzhou 730314, China
Published: 2023-06-25 doi: 10.19666/j.rlfd.202212290
Outline
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In view of the actual distribution of heat boundary conditions on the cooling wall of supercritical carbon dioxide (S-CO2) coal-fired boiler, the heat transfer characteristics of supercritical CO2 in a vertical circular tube under axial non-uniform heat flux were numerically studied by using SST k-ω low Reynolds number turbulence model. The influence of different heat flux distribution, mass flux on heat transfer performance and wall temperature distribution was analyzed. The results show that the axial non-uniform heat flux distribution has a significant effect on the heat transfer of S-CO2. Compared with the uniform heat flux, the total heat transfer coefficient under the axial non-uniform heat flux increases by about 8%. The non-uniform distribution of axial heat flux can inhibit the heat transfer deterioration and effectively reduce the peak wall temperature. Under the condition of non-uniform heat flux, the heat transfer of S-CO2 is mainly affected by the thickness of the gas-like film, the thermal conductivity of the gas-like film and the specific heat near the wall. The results provide theoretical guidance for the design of supercritical CO2 boiler.

supercritical carbon dioxide  /  numerical simulation  /  half circumferential heating  /  heat flux with axial non-uniform
Bingguo ZHU, Kaigang GONG, Xiaoliang YANG, Bin PENG, Baokun YANG. Heat transfer characteristics of supercritical carbon dioxide in vertical tube under axial non-uniform heat flux[J]. Thermal Power Generation, 2023 , 52 (6) : 45 -51 . DOI: 10.19666/j.rlfd.202212290
Funding
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  • Natural Science Foundation of Gansu Province(22JR5RA283)
  • Excellent Postgraduate "Innovation Star" Project of Gansu Provincial Department of Education(2022CXZX-416)
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Year 2023 volume 52 Issue 6
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Article Info
doi: 10.19666/j.rlfd.202212290
  • Receive Date：2022-12-22
  • Online Date：2026-01-23
  • Published：2023-06-25
Article Data
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History
  • Received：2022-12-22
Funding
Natural Science Foundation of Gansu Province(22JR5RA283)
Excellent Postgraduate "Innovation Star" Project of Gansu Provincial Department of Education(2022CXZX-416)
Affiliations
    1.School of Mechanical & Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    2.Lanshi Petroleum Equipment Engineering Co., Ltd., Lanzhou 730314, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202212290
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表12种不同金属材料的力学参数
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Number of
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Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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