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Performance assessment of staged-air declination in improving asymmetric gas/particle flow characteristics within a down-fired 600 MWe supercritical utility boiler

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  • Kuang, Min
  • Li, Zhengqi
  • Zhu, Qunyi
  • Zhang, Yan

Abstract

By using phase-Doppler anemometry (PDA) measurements within a cold small-scale model for a down-fired 600-MWe supercritical utility boiler, gas/particle flow characteristics were acquired at various staged-air declination angle settings (i.e., 0°, 15°, 30°, and 45°) so as to assess the availability of a staged-air declination method in improving the strong asymmetric gas/particle flow field. Detailed comparisons made in the mean velocity, particle volume flux, particle number concentration, gas/particle flow decays, and trajectories of the downward gas/particle flows with respect to different staged-air angle settings, revealed that enlarging the staged-air angle essentially did not change the strong asymmetric patterns in gas/particle flow characteristics. From measurements taken within a real furnace equipped with a designed horizontally-fed staged air (i.e., 0° for the staged-air angle), strong asymmetric combustion characterized by gas temperatures being much higher near the rear wall than near the front wall, low burnout, and particularly high NOx emissions, were found. By considering the appearance of a similar strong asymmetric gas/particle flow field at various staged-air angle settings in this study and at different staged-air ratios in a previous study, staged-air declination and staged-air ratio reduction are very likely to be inapplicable if applied in real furnaces to deal with these problems (i.e., strong asymmetric combustion, low burnout and high NOx emissions). Retrofitting a boiler with deep-air-staging combustion technology developed in our recent investigation is recommended if symmetric combustion, high burnout, and low NOx emissions are to be achieved.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:49:y:2013:i:c:p:423-433
    DOI: 10.1016/j.energy.2012.11.022
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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. 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.
    4. Fan, Weidong & Li, Youyi & Lin, Zhengchun & Zhang, Mingchuan, 2010. "PDA research on a novel pulverized coal combustion technology for a large utility boiler," Energy, Elsevier, vol. 35(5), pages 2141-2148.
    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. Kuang, Min & Yang, Guohua & Zhu, Qunyi & Ti, Shuguang & Wang, Zhenfeng, 2017. "Effect of burner location on flow-field deflection and asymmetric combustion in a 600MWe supercritical down-fired boiler," Applied Energy, Elsevier, vol. 206(C), pages 1393-1405.
    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. 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.
    4. 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.
    5. Liu, Guangkui & Chen, Zhichao & Li, Zhengqi & Zong, Qiudong & Zhang, Hao, 2014. "Effect of the arch-supplied over-fire air ratio on gas/solid flow characteristics of a down-fired boiler," Energy, Elsevier, vol. 70(C), pages 95-109.
    6. 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.
    7. 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.

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