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Optical non-intrusive measurements of internal recirculation zone of pulverized coal swirling flames with secondary swirl intensity

Author

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  • Sung, Yonmo
  • Lee, Sangmin
  • Eom, Seongyong
  • Moon, Cheoreon
  • Ahn, Seongyool
  • Choi, Gyungmin
  • Kim, Duckjool

Abstract

The most favorable condition for NOx reduction in the swirl burner of wall-fired type boilers is to increase the residence time of pulverized coal particles in the internal recirculation zone which should be fuel-rich environments. The purpose of this study is to elucidate fundamental mechanisms for NOx reduction in pulverized coal swirling flames by means of the detailed observation of the flow field of the oxygen lean internal recirculation zone. The structure of pulverized coal swirling flames with secondary swirl intensity is studied experimentally by particle image velocimetry and local flame colors based on OH∗, CH∗, and C2∗ chemiluminescence intensities. The results show that the internal recirculation zone is enlarged with increasing the outer swirl intensity because the location of the stagnation point moves toward downstream. Also, the exhaust tube vortex is observed along the centerline in the flames, and started from near the stagnation point. For the combustion characteristics, the maximum temperature reduces as the outer swirl intensity increases, and the flame then moves downstream. The higher outer swirl intensity would be more effective in the low NOx swirl burner systems because of enhancing a dimension of the internal recirculation zone and reducing a local rate of chemical reaction.

Suggested Citation

  • Sung, Yonmo & Lee, Sangmin & Eom, Seongyong & Moon, Cheoreon & Ahn, Seongyool & Choi, Gyungmin & Kim, Duckjool, 2016. "Optical non-intrusive measurements of internal recirculation zone of pulverized coal swirling flames with secondary swirl intensity," Energy, Elsevier, vol. 103(C), pages 61-74.
    • Handle: RePEc:eee:energy:v:103:y:2016:i:c:p:61-74
    DOI: 10.1016/j.energy.2015.12.095
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    Cited by:

    1. Yan, Rong & Chen, Zhichao & Zhang, Bo & Zheng, Yu & Li, Zhengqi, 2022. "Impact of radial air staging on gas-particle flow characteristics in an industrial pulverized coal boiler," Energy, Elsevier, vol. 243(C).
    2. Chen, Zhichao & Yuan, Zhenhua & Zhang, Bo & Qiao, Yanyu & Li, Jiawei & Zeng, Lingyan & Li, Zhengqi, 2022. "Effect of secondary air mass flow rate ratio on the slagging characteristics of the pre-combustion chamber in industrial pulverized coal-fired boiler," Energy, Elsevier, vol. 251(C).
    3. Laphirattanakul, Ponepen & Charoensuk, Jarruwat & Turakarn, Chinnapat & Kaewchompoo, Chatchalerm & Suksam, Niwat, 2020. "Development of pulverized biomass combustor with a pre-combustion chamber," Energy, Elsevier, vol. 208(C).
    4. Choi, Minsung & Park, Yeseul & Deng, Kaiwen & Li, Xinzhuo & Kim, Kibeom & Sung, Yonmo & Hwang, Taegam & Choi, Gyungmin, 2022. "Effects of exhaust tube vortex on the in-furnace phenomena in a swirl-stabilized pulverized coal flame," Energy, Elsevier, vol. 239(PE).
    5. Yuan, Zhenhua & Chen, Zhichao & Bian, Liguo & Wu, Xiaolan & Zhang, Bo & Li, Jiawei & Qiao, Yanyu & Li, Zhengqi, 2023. "Influence of blade angle in the outer secondary air for swirl burner on the flow, combustion, and slagging characteristics in the pre-combustion chamber under the air-staged condition," Energy, Elsevier, vol. 275(C).
    6. Choi, Minsung & Park, Yeseul & Li, Xinzhuo & Kim, Kibeom & Sung, Yonmo & Hwang, Taegam & Choi, Gyungmin, 2021. "Numerical evaluation of pulverized coal swirling flames and NOx emissions in a coal-fired boiler: Effects of co- and counter-swirling flames and coal injection modes," Energy, Elsevier, vol. 217(C).
    7. Choi, Minsung & Kim, Kibeom & Li, Xinzhuo & Deng, Kaiwen & Park, Yeseul & Seo, Minseok & Sung, Yonmo & Choi, Gyungmin, 2020. "Strategic combustion technology with exhaust tube vortex flame: Combined effect of biomass co-firing and air-staged combustion on combustion characteristics and ash deposition," Energy, Elsevier, vol. 203(C).
    8. Yafei Zhang & Rui Luo & Yihua Dou & Qulan Zhou, 2018. "Combustion Characteristics and NO x Emission through a Swirling Burner with Adjustable Flaring Angle," Energies, MDPI, vol. 11(8), pages 1-14, August.
    9. Choi, Minsung & Hwang, Taegam & Park, Yeseul & Li, Xinzhuo & Kim, Junsung & Kim, Kibeom & Sung, Yonmo & Choi, Gyungmin, 2023. "Numerical evaluation of the effect of swirl configuration and fuel-rich environment on combustion and emission characteristics in a coal-fired boiler," Energy, Elsevier, vol. 268(C).

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