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Effects of flue gases (CO/CO2/SO2/H2O/O2) on NO-Char interaction at high temperatures

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  • Zhao, Yijun
  • Feng, Dongdong
  • Li, Bowen
  • Wang, Pengxiang
  • Tan, Heping
  • Sun, Shaozeng

Abstract

The effects of major flue gases (CO/CO2/SO2/H2O/O2) on the NO–char interaction at realistic high temperatures in the reburning zone of boiler are investigated, through the HEFR and HDTF at 1200–1500 °C. The results indicates that CO could significantly promote the NO–char interaction, with its temperature-sensitive region at 3%–5% CO. CO2 (<5%) would promote NO reduction rate by 5–16%, while CO2 in larger concentration has little effect on NO–char interaction. The effect of SO2 on the NO–char interaction is limited. H2O from 0 to 20% would make an increase of NO reduction rate by approximately 18%, with the formation of CO and HCN. 0.8% is the optimal O2 concentration promoting the NO–char reduction. Even with a small amount of oxygen (0.8% O2), the addition of H2O could promote NO reduction at 1200 °C. With O2 from 0.8% to 4% with 10% H2O, the temperature-depending effects of H2O and O2 on NO–char interaction is advanced from 1.0 s to 0.5 s, even earlier. With CO2 from 5% to 11% with 0.8% O2, the temperature-depending effects of CO2 and O2 on NO–char interaction could be advanced from 1.5 s to 0.5 s.

Suggested Citation

  • Zhao, Yijun & Feng, Dongdong & Li, Bowen & Wang, Pengxiang & Tan, Heping & Sun, Shaozeng, 2019. "Effects of flue gases (CO/CO2/SO2/H2O/O2) on NO-Char interaction at high temperatures," Energy, Elsevier, vol. 174(C), pages 519-525.
    • Handle: RePEc:eee:energy:v:174:y:2019:i:c:p:519-525
    DOI: 10.1016/j.energy.2019.02.156
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    References listed on IDEAS

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    1. Xu, Mingxin & Li, Shiyuan & Wu, Yinghai & Jia, Lufei, 2017. "Reduction of recycled NO over char during oxy-fuel fluidized bed combustion: Effects of operating parameters," Applied Energy, Elsevier, vol. 199(C), pages 310-322.
    2. Xu, Mingxin & Li, Shiyuan & Wu, Yinghai & Jia, Lufei & Lu, Qinggang, 2017. "The characteristics of recycled NO reduction over char during oxy-fuel fluidized bed combustion," Applied Energy, Elsevier, vol. 190(C), pages 553-562.
    3. Hu, Yukun & Yan, Jinyue, 2012. "Characterization of flue gas in oxy-coal combustion processes for CO2 capture," Applied Energy, Elsevier, vol. 90(1), pages 113-121.
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    Cited by:

    1. Wang, Pengqian & Bai, Bo & Wang, Chang'an & Du, Yongbo & Wang, Chaowei & Che, Defu, 2023. "Experimental and kinetics study of NO heterogeneous reduction on semi-coke and its chars: Effects of high-temperature rapid pyrolysis and atmosphere," Energy, Elsevier, vol. 264(C).
    2. Yuan, Maobo & Wang, Chang’an & Zhao, Lin & Wang, Pengqian & Wang, Chaowei & Che, Defu, 2020. "Experimental and kinetics study of NO heterogeneous reduction by the blends of pyrolyzed and gasified semi-coke," Energy, Elsevier, vol. 207(C).
    3. Chen, Yi-Feng & Su, Sheng & Liu, Tao & Song, Ya-Wei & Wang, Xin & Qing, Meng-Xia & Wang, Yi & Hu, Song & Zhang, Zhong-Xiao & Xiang, Jun, 2022. "Microscopic mechanism and kinetics of NO heterogeneous reduction on char surface: A density functional theory study," Energy, Elsevier, vol. 250(C).
    4. Wang, Chaowei & Wang, Chang'an & Feng, Qinqin & Mao, Qisen & Gao, Xinyue & Du, Yongbo & Li, Guangyu & Che, Defu, 2022. "Experimental evaluation on NOx formation and burnout characteristics of oxy-fuel co-combustion of ultra-low volatile carbon-based solid fuels and bituminous coal," Energy, Elsevier, vol. 248(C).
    5. Zhang, Hai & Luo, Lei & Liu, Jiaxun & Jiao, Anyao & Liu, Jianguo & Jiang, Xiumin, 2019. "Theoretical study on the reduction reactions from solid char(N): The effect of the nearby group and the high-spin state," Energy, Elsevier, vol. 189(C).

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    Keywords

    Char; Coal; Flue gases; NO;
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