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Experiment on removal performance of SO3 from coal-fired flue gas using typical base-type absorbents
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Zehua LI1, Junbo ZHOU2, Yanjun GUO2, Ruidong WANG1, Xiaoyu LI1, Xin ZHANG3, Xin’ao LI3, Mengxia QING3
Thermal Power Generation | 2025, 54(9) : 154 - 163
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Thermal Power Generation | 2025, 54(9): 154-163
• Thermal energy science research •
Experiment on removal performance of SO3 from coal-fired flue gas using typical base-type absorbents
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Zehua LI1, Junbo ZHOU2, Yanjun GUO2, Ruidong WANG1, Xiaoyu LI1, Xin ZHANG3, Xin’ao LI3, Mengxia QING3
Affiliations
  • 1.State Power Investment Corporation Inner Mongolia Baiyinhua Coal Power Co., Ltd. Kengkou Power Generation Branch, Xilingol League 026000, China
  • 2.Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China
  • 3.College of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, China
Published: 2025-09-25 doi: 10.19666/j.rlfd.202411253
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The formation and emission of SO3 in coal-fired flue gas pose serious threats to both the safe and economical operation of power plants and the atmospheric environment. To solve this problem, the SO3 removal performance of sodium-based, calcium-based and magnesium-based absorbents is investigated, and the performance variations of Na2CO3, Ca(OH)2 and CaO under different operating conditions are studied. The results indicate that, under the coexistence of SO2 and SO3, the absorbers would react with SO3 in the flue gas preferentially, and the effectiveness of SO3 removal by various absorbents ranked from highest to lowest is as follows: Na2CO3>NaHCO3>Mg(OH)2>MgO>Ca(OH)2>CaO. Under certain experimental conditions, the SO3 removal efficiencies of all the absorbents could reach higher than 80% when the chemical equivalent ratio of absorbent to SO2 reached 2:1. Pre-calcination treatment for the absorbents enhanced their pore structures, facilitating SO3 diffusion into the absorbent and improving the SO3 absorption efficiency. Increasing reaction temperature, chemical equivalent ratio, and initial SO3 mass concentration can promote the SO3 removal. Additionally, a moderate increase in H2O volume fraction aided SO3 removal. When the absorbent is significantly excessive, external diffusion is the main controlling step affecting the chemical reaction rate, while the type of absorbent has a relatively minor impact on it.

coal-fired flue gas  /  SO3  /  base absorbents  /  removal performance
Zehua LI, Junbo ZHOU, Yanjun GUO, Ruidong WANG, Xiaoyu LI, Xin ZHANG, Xin’ao LI, Mengxia QING. Experiment on removal performance of SO3 from coal-fired flue gas using typical base-type absorbents[J]. Thermal Power Generation, 2025 , 54 (9) : 154 -163 . DOI: 10.19666/j.rlfd.202411253
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  • National Natural Science Foundation of China(52106131; 52476102)
Appendix
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Year 2025 volume 54 Issue 9
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Article Info
doi: 10.19666/j.rlfd.202411253
  • Receive Date：2024-11-02
  • Online Date：2026-03-05
  • Published：2025-09-25
Article Data
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History
  • Received：2024-11-02
Funding
National Natural Science Foundation of China(52106131; 52476102)
Affiliations
    1.State Power Investment Corporation Inner Mongolia Baiyinhua Coal Power Co., Ltd. Kengkou Power Generation Branch, Xilingol League 026000, China
    2.Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China
    3.College of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, China
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