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Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

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  • Ren, Feng
  • Li, Zhengqi
  • Liu, Guangkui
  • Chen, Zhichao
  • Zhu, Qunyi

Abstract

Air-surrounding-fuel is a well-known concept used within tangential and wall-fired boilers. Here, we report for the first time on industrial experiments performed to study the effects of this concept on a 660 MWe full-scale down-fired boiler. Data are reported for the gas temperature distributions along the primary air and coal-mixed flows, furnace temperatures, gas compositions, for example O2, CO and NOx, and gas temperatures in the near-wall region. The influence of concentration control valve (CCV) opening on combustion and NOx emission in the furnace were determined. The results show that the flame stability, temperature distribution, unburnt carbon are influenced by both concentration ratios and fuel-rich flow velocities. As CCV opening increases, NOx emissions decrease from 2594 mg/m3 to 1895 mg/m3. Considering altogether economic benefits and environmental protection issues, 30% is the optimal value for the CCV opening.

Suggested Citation

  • Ren, Feng & Li, Zhengqi & Liu, Guangkui & Chen, Zhichao & Zhu, Qunyi, 2011. "Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept," Energy, Elsevier, vol. 36(1), pages 70-77.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:1:p:70-77
    DOI: 10.1016/j.energy.2010.11.010
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    Cited by:

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    2. Liu, Guangkui & Li, Zhengqi & Chen, Zhichao & Zhu, Xingying & Zhu, Qunyi, 2012. "Effect of the anthracite ratio of blended coals on the combustion and NOx emission characteristics of a retrofitted down-fired 660-MWe utility boiler," Applied Energy, Elsevier, vol. 95(C), pages 196-201.
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    4. Kuang, Min & Li, Zhengqi & Zhu, Qunyi & Zhang, Yan, 2013. "Performance assessment of staged-air declination in improving asymmetric gas/particle flow characteristics within a down-fired 600 MWe supercritical utility boiler," Energy, Elsevier, vol. 49(C), pages 423-433.
    5. Kuang, Min & Wu, Haiqian & Zhu, Qunyi & Ti, Shuguang, 2018. "Establishing an overall symmetrical combustion setup for a 600 MWe supercritical down-fired boiler: A numerical and cold-modeling experimental verification," Energy, Elsevier, vol. 147(C), pages 208-225.
    6. Kuang, Min & Zhu, Qunyi & Ling, Zhongqian & Ti, Shuguang & Li, Zhengqi, 2017. "Improving gas/particle flow deflection and asymmetric combustion of a 600 MWe supercritical down-fired boiler by increasing its upper furnace height," Energy, Elsevier, vol. 127(C), pages 581-593.
    7. Anufriev, I.S., 2021. "Review of water/steam addition in liquid-fuel combustion systems for NOx reduction: Waste-to-energy trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    8. Kuang, Min & Li, Zhengqi & Zhu, Qunyi & Wang, Yang & Chen, Lizhe & Zhang, Yan, 2012. "Experimental gas/particle flow characteristics of a down-fired 600 MWe supercritical utility boiler at different staged-air ratios," Energy, Elsevier, vol. 42(1), pages 411-423.
    9. Ling, Zhongqian & Zhou, Hao & Ren, Tao, 2015. "Effect of the flue gas recirculation supply location on the heavy oil combustion and NOx emission characteristics within a pilot furnace fired by a swirl burner," Energy, Elsevier, vol. 91(C), pages 110-116.
    10. Li, Zhengqi & Liu, Guangkui & Chen, Zhichao & Zeng, Lingyan & Zhu, Qunyi, 2013. "Effect of angle of arch-supplied overfire air on flow, combustion characteristics and NOx emissions of a down-fired utility boiler," Energy, Elsevier, vol. 59(C), pages 377-386.
    11. Ling, Zhongqian & Ling, Bo & Kuang, Min & Li, Zhengqi & Lu, Ye, 2017. "Comparison of airflow, coal combustion, NOx emissions, and slagging characteristics among three large-scale MBEL down-fired boilers manufactured at different times," Applied Energy, Elsevier, vol. 187(C), pages 689-705.
    12. Liu, Chunlong & Li, Zhengqi & Zeng, Lingyan & Zhang, Qinghua & Hu, Richa & Zhang, Xusheng & Guo, Liang & Huang, Yong & Yang, Xianwei & Chen, Liheng, 2016. "Gas/particle two-phase flow characteristics of a down-fired 350 MWe supercritical utility boiler at different tertiary air ratios," Energy, Elsevier, vol. 102(C), pages 54-64.
    13. Kuang, Min & Li, Zhengqi, 2014. "Review of gas/particle flow, coal combustion, and NOx emission characteristics within down-fired boilers," Energy, Elsevier, vol. 69(C), pages 144-178.
    14. Liu, Chunlong & Li, Zhengqi & Jing, Xinjing & Xie, Yiquan & Zhang, Qinghua & Zong, Qiudong, 2014. "Experimental investigation into gas/particle flow in a down-fired 350 MWe supercritical utility boiler at different over-fire air ratios," Energy, Elsevier, vol. 64(C), pages 771-778.
    15. Wang, Jialin & Kuang, Min & Zhao, Xiaojuan & Wu, Haiqian & Ti, Shuguang & Chen, Chuyang & Jiao, Long, 2020. "Trends of the low-NOx and high-burnout combustion characteristics in a cascade-arch, W-shaped flame furnace regarding with the staged-air angle," Energy, Elsevier, vol. 212(C).
    16. Kuang, Min & Li, Zhengqi & Zhang, Yan & Chen, Xiachao & Jia, Jinzhao & Zhu, Qunyi, 2012. "Asymmetric combustion characteristics and NOx emissions of a down-fired 300 MWe utility boiler at different boiler loads," Energy, Elsevier, vol. 37(1), pages 580-590.
    17. Mikulandrić, Robert & Lončar, Dražen & Cvetinović, Dejan & Spiridon, Gabriel, 2013. "Improvement of existing coal fired thermal power plants performance by control systems modifications," Energy, Elsevier, vol. 57(C), pages 55-65.
    18. Zeng, Lingyan & Song, Minhang & Li, Xiaoguang & Liu, Yibo & Li, Zhengqi & Chen, Zhichao, 2017. "Factors affecting the downward flame depth in a 600 MW down-fired boiler incorporating multiple-injection and multiple-staging technology," Energy, Elsevier, vol. 118(C), pages 333-344.

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