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Effect of angle of arch-supplied overfire air on flow, combustion characteristics and NOx emissions of a down-fired utility boiler

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  • Li, Zhengqi
  • Liu, Guangkui
  • Chen, Zhichao
  • Zeng, Lingyan
  • Zhu, Qunyi

Abstract

A new overfire air (OFA) technology was proposed by the authors for a Foster Wheeler down-fired boiler, and a small-scale cold experimental system for a 660-MWe unit was established. The velocity field distribution was measured in the furnace to study the characteristics of single-phase flow in the furnace at different OFA nozzle angles. The furnace temperature and distributions of the O2 concentration and NO concentration at different OFA nozzle angles were simulated using Fluent 6.3.26, and the average temperature of the furnace outlet, the O2 and NOx concentrations and carbon content in the fly ash were calculated. As the OFA nozzle angle increased, the vertical penetration depth of OFA increased and the horizontal penetration depth of OFA gradually decreased. The carbon content in the fly ash and NOx concentration initially rose and then fell at the furnace outlet, and they were lowest when the OFA angle was set at 20°. Thus, according to the findings of this article, an optimized OFA angle of 20° was chosen.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:59:y:2013:i:c:p:377-386
    DOI: 10.1016/j.energy.2013.06.020
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    References listed on IDEAS

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    1. Staiger, B. & Unterberger, S. & Berger, R. & Hein, Klaus R.G., 2005. "Development of an air staging technology to reduce NOx emissions in grate fired boilers," Energy, Elsevier, vol. 30(8), pages 1429-1438.
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    3. 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.
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    Cited by:

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    5. 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.
    6. Ti, Shuguang & Chen, Zhichao & Li, Zhengqi & Xie, Yiquan & Shao, Yunlin & Zong, Qiudong & Zhang, Qinghua & Zhang, Hao & Zeng, Lingyan & Zhu, Qunyi, 2014. "Influence of different swirl vane angles of over fire air on flow and combustion characteristics and NOx emissions in a 600 MWe utility boiler," Energy, Elsevier, vol. 74(C), pages 775-787.
    7. 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).

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