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Detailed gas/particle flow characteristics of an improved down-fired boiler with respect to a critical factor affecting coal burnout: Vent-air inclination angle

Author

Listed:
  • Wang, Qingxiang
  • Chen, Zhichao
  • Han, Hui
  • Tu, Yaojie
  • Liu, Guangkui
  • Zeng, Lingyan
  • Li, Zhengqi

Abstract

The eccentric-swirl-secondary-air combustion technology has been confirmed to comprehensively solve high NOx emission and poor coal burnout for down-fired boilers with swirl burners. The influence of vent-air inclination angle (βv), a critical factor that affects coal burnout, on gas/particle flow characteristics is investigated to further decrease unburned combustible in fly ash. Gas/particle two-phase flow experiments under different βv (i.e., 10°, 20°, 28°, 40° and 50°) are performed by using a particle dynamic analyser in a 1:10-scale model of the full-scale improved boiler. With increasing βv, the under-arch recirculation zone and the recirculation velocities of gas/particle flows continuously increase. In the staged air region, the vertical velocities of gas/particle flows near water-cooled wall for βv of 40° and 50° are still as high as 2–4 m/s, however, the vertical velocities of gas/particle flows basically decay to negative values for smaller βv of 10° and 20°. At furnace section Y/Y0 from 0.220 to 0.369, the vertical fluctuation velocities of gas/particle flows near water-cooled wall for βv of 40° and 50° are significantly higher than those with βv of 10°, 20° and 28°, and the particle volume flux at the same horizontal position X/X0 constantly increases with increasing βv. Furthermore, the downward ejection ability of vent air to gas/particle flows from burners continuously improves, and the downward depth of gas/particle flows and the space utilization ratio of lower furnace both increase with increasing βv. The appropriate inclination angle of vent air for the improved boiler varies from 40° to 50°.

Suggested Citation

  • Wang, Qingxiang & Chen, Zhichao & Han, Hui & Tu, Yaojie & Liu, Guangkui & Zeng, Lingyan & Li, Zhengqi, 2019. "Detailed gas/particle flow characteristics of an improved down-fired boiler with respect to a critical factor affecting coal burnout: Vent-air inclination angle," Energy, Elsevier, vol. 182(C), pages 570-584.
    • Handle: RePEc:eee:energy:v:182:y:2019:i:c:p:570-584
    DOI: 10.1016/j.energy.2019.06.057
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    Cited by:

    1. Yan, Rong & Chen, Zhichao & Zheng, Yu & Yuan, Linxuan & Zeng, Lingyan & Li, Zhengqi, 2021. "Influence of inner and outer secondary air ratio on flow and combustion characteristics of a swirl burner in a 29 MW pulverized coal boiler," Energy, Elsevier, vol. 237(C).
    2. Fang, Neng & Zhang, Pan & Wang, Weiliang & Wang, Qian & Lyu, Junfu & Zhang, Hai & Yue, Guangxi, 2022. "Effects of coal particle size on the two-phase flow and slagging performance in a swirl burner," Energy, Elsevier, vol. 238(PB).
    3. Li, Xiaoguang & Zeng, Lingyan & Zhang, Ning & Zhang, Xin & Song, Minhang & Chen, Zhichao & Li, Zhengqi, 2022. "Effects of the gas/particle flow and combustion characteristics on water-wall temperature and energy conversion in a supercritical down-fired boiler at different secondary-air distributions," Energy, Elsevier, vol. 238(PC).

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