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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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    Cited by:

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    3. 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.
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    5. Liu, Xiaozhou & Zhu, Guangyu & Asim, Taimoor & Mishra, Rakesh, 2022. "Application of momentum flux method for the design of an α-shaped flame incinerator fueled with two-component solid waste," Energy, Elsevier, vol. 248(C).
    6. 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.
    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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