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The characteristics of recycled NO reduction over char during oxy-fuel fluidized bed combustion

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  • Xu, Mingxin
  • Li, Shiyuan
  • Wu, Yinghai
  • Jia, Lufei
  • Lu, Qinggang

Abstract

To explain the reduction process of recycled NO over char during oxy-fuel fluidized bed combustion, the characteristics associated with the reduction of recycled NO were investigated in the present study. The experimental results were obtained using a bubbling fluidized bed. The effects of typical impurities within the recycled flue gas on the reduction of recycled NO were also studied. It was determined that significant reduction of the recycled NO over char occurred under oxy-fuel fluidized bed combustion conditions. The apparent activation energy of the recycled NO reduction reaction was much lower when combustion occurred. The competition between the NO formation from char nitrogen and the reduction of recycled NO over char determined the final NO concentration of the flue gas. The recycled NO concentration had little influence on the reduction ratios during oxy-fuel fluidized bed combustion when NO formation from char nitrogen was considered. Recycled SO2 can enhance the reduction of recycled NO over char during oxy-fuel combustion while the low concentration of recycled CO had a little effect on the process of recycled NO reduction. The reduction ratios of recycled NO increased as the recycled SO2 concentration increased. Moreover, significant capture of recycled SO2 was observed during oxy-fuel fluidized bed combustion.

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  • 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.
    • Handle: RePEc:eee:appene:v:190:y:2017:i:c:p:553-562
    DOI: 10.1016/j.apenergy.2016.12.073
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    2. Engin, Berrin & Kayahan, Ufuk & Atakül, Hüsnü, 2020. "A comparative study on the air, the oxygen-enriched air and the oxy-fuel combustion of lignites in CFB," Energy, Elsevier, vol. 196(C).
    3. 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.
    4. Wu, Hai-bo & Xu, Ming-xin & Li, Yan-bing & Wu, Jin-hua & Shen, Jian-chong & Liao, Haiyan, 2020. "Experimental research on the process of compression and purification of CO2 in oxy-fuel combustion," Applied Energy, Elsevier, vol. 259(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).
    6. Wang, Pengqian & Wang, Chang'an & Yuan, Maobo & Wang, Chaowei & Zhang, Jinping & Du, Yongbo & Tao, Zichen & Che, Defu, 2020. "Experimental evaluation on co-combustion characteristics of semi-coke and coal under enhanced high-temperature and strong-reducing atmosphere," Applied Energy, Elsevier, vol. 260(C).
    7. Chen, Zhichao & Qiao, Yanyu & Guan, Shuo & Wang, Zhenwang & Zheng, Yu & Zeng, Lingyan & Li, Zhengqi, 2022. "Effect of inner and outer secondary air ratios on ignition, C and N conversion process of pulverized coal in swirl burner under sub-stoichiometric ratio," Energy, Elsevier, vol. 239(PD).

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