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Aerodynamic characteristics within a cold small-scale model for a down-fired 350 MWe supercritical utility boiler at various primary air to vent air ratios

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  • Liu, Chunlong
  • Li, Zhengqi
  • Zhang, Xiang
  • Jing, Xinjing
  • Zhang, Wenzhen
  • Chen, Zhichao
  • Zhu, Qunyi

Abstract

Down-fired boilers currently suffer from a number of different issues including high levels of fly ash in the combustible matter, serious slagging and a high level of NOx emissions. In this study, the combustion system of a down-fired 350 MWe supercritical utility boiler was designed with multiple injections and multiple staging to experimentally investigate the impact of the primary air to vent air ratio on the aerodynamic field in the furnace. We constructed a cold 1:10 scale model of the down-fired boiler, and used this to compare the distribution characteristics of the furnace vertical velocity component along the horizontal direction, the decay curves of the downward airflow, and the effect of the secondary air supply ejector on the primary air. It was found that changing the ratio of primary air:vent air had very little effect on the downward flow. Taking the pulverized-coal concentration, the primary air velocity, and other factors into account, we found that the optimal ratio of primary air:vent air was 5:5.

Suggested Citation

  • Liu, Chunlong & Li, Zhengqi & Zhang, Xiang & Jing, Xinjing & Zhang, Wenzhen & Chen, Zhichao & Zhu, Qunyi, 2012. "Aerodynamic characteristics within a cold small-scale model for a down-fired 350 MWe supercritical utility boiler at various primary air to vent air ratios," Energy, Elsevier, vol. 47(1), pages 294-301.
    • Handle: RePEc:eee:energy:v:47:y:2012:i:1:p:294-301
    DOI: 10.1016/j.energy.2012.09.017
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    References listed on IDEAS

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    1. Li, Zhengqi & Liu, Guangkui & Zhu, Qunyi & Chen, Zhichao & Ren, Feng, 2011. "Combustion and NOx emission characteristics of a retrofitted down-fired 660Â MWe utility boiler at different loads," Applied Energy, Elsevier, vol. 88(7), pages 2400-2406, July.
    2. Fan, J.R. & Liang, X.H. & Chen, L.H. & Cen, K.F., 1998. "Modeling of NOx emissions from a W-shaped boiler furnace under different operating conditions," Energy, Elsevier, vol. 23(12), pages 1051-1055.
    3. Fan, J.R. & Liang, X.H. & Xu, Q.S. & Zhang, X.Y. & Cen, K.F., 1997. "Numerical simulation of the flow and combustion processes in a three-dimensional, w-shaped boiler furnace," Energy, Elsevier, vol. 22(8), pages 847-857.
    4. 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.
    5. 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.
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    Cited by:

    1. Chen, Heng & Wu, Yunyun & Qi, Zhen & Chen, Qiao & Xu, Gang & Yang, Yongping & Liu, Wenyi, 2019. "Improved combustion air preheating design using multiple heat sources incorporating bypass flue in large-scale coal-fired power unit," Energy, Elsevier, vol. 169(C), pages 527-541.
    2. 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.
    3. 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.
    4. 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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