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Effects of exhaust tube vortex on the in-furnace phenomena in a swirl-stabilized pulverized coal flame

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Listed:
  • Choi, Minsung
  • Park, Yeseul
  • Deng, Kaiwen
  • Li, Xinzhuo
  • Kim, Kibeom
  • Sung, Yonmo
  • Hwang, Taegam
  • Choi, Gyungmin

Abstract

This paper presents an experimental investigation of the effects of the exhaust tube vortex (ETV) on pollutant emissions and carbon burnout performance. The novelty in this study is to improve understanding of combustion behavior with the ETV structure via detailed in-furnace measurements (temperature, gas-phase species concentration, carbon burnout, emissions, and etc.) in a 16-kWth coal-fired furnace. The experiment considered two different swirling flames (co- and counter-swirl) with four air staging positions. A hollow tubular structure such as the ETV structure has been created under the co-swirl condition. The values of NOx emissions are about 430 ppm, but the CO emission is lower and carbon burnout is approximately 2% higher than that of the counter-swirl unstaging condition at the furnace outlet. For the air staging conditions, the air staging position 3 (SL3) maintained the generated ETV structure stronger in the primary combustion zone. The SL3 condition produced the lowest CO emission at about 275 ppm, and a relatively low emission of NOx showed with the highest carbon burnout performance of approximately 94.5% or more. The SL3 condition is the most favorable condition for the synergistic effect of air staging technology on the ETV structure with a low-NOx swirl-stabilized burner.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pe:s036054422102658x
    DOI: 10.1016/j.energy.2021.122409
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    1. 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).
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    4. 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.
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    1. Li, Xinzhuo & Choi, Minsung & Jung, Chanho & Park, Yeseul & Choi, Gyungmin, 2022. "Effects of the staging position and air−LPG mixing ratio on the combustion and emission characteristics of coal and gas co-firing," Energy, Elsevier, vol. 254(PB).
    2. 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).
    3. 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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