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Numerical Study on the Homogeneous Reactions of Mercury in a 600 MW Coal-Fired Utility Boiler

Author

Listed:
  • Qiang Lyu

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Chang’an Wang

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Xuan Liu

    (College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
    Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China)

  • Defu Che

    (State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

The homogeneous oxidation of elemental mercury (Hg 0 ) can promote Hg pollution control in coal-fired power plants, while the mechanisms and quantitative contributions of homogeneous reactions in Hg 0 oxidation, especially the reactions between Hg and chlorine (Cl), are still unclear. Here, a numerical study on the homogeneous reactions of Hg was conducted within a 600 MW tangentially fired boiler for the first time. A novel Hg sub-model was established by coupling the thermodynamics, reaction kinetics and fluid dynamics. The results showed that the higher Cl content in coal was beneficial to the oxidation of Hg 0 . The homogeneous reactions of Hg mainly occurred in the vertical flue pass at low temperature. Hg 0 was still the dominant Hg-containing species at the boiler exit, and the concentration of mercury chloride (HgCl 2 ) was the highest among the oxidized mercury. When low-Cl coal was fired, the addition of a small amount of chlorine species into the boiler at the burnout area increased the ratio of HgCl 2 by over 16 times without causing serious chlorine corrosion problems.

Suggested Citation

  • Qiang Lyu & Chang’an Wang & Xuan Liu & Defu Che, 2022. "Numerical Study on the Homogeneous Reactions of Mercury in a 600 MW Coal-Fired Utility Boiler," Energies, MDPI, vol. 15(2), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:2:p:446-:d:720838
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    References listed on IDEAS

    as
    1. Xiaohang Li & Yang Teng & Kai Zhang & Hao Peng & Fangqin Cheng & Kunio Yoshikawa, 2020. "Mercury Migration Behavior from Flue Gas to Fly Ashes in a Commercial Coal-Fired CFB Power Plant," Energies, MDPI, vol. 13(5), pages 1-15, February.
    2. Nuria Fernández-Miranda & Elena Rodríguez & Maria Antonia Lopez-Anton & Roberto García & Maria Rosa Martínez-Tarazona, 2017. "A New Approach for Retaining Mercury in Energy Generation Processes: Regenerable Carbonaceous Sorbents," Energies, MDPI, vol. 10(9), pages 1-11, September.
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