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Influence of the multi-burner bias angle on the air/particle flow characteristics in an improved fly ash entrained-flow gasifier

Author

Listed:
  • Fang, Neng
  • Li, Zhengqi
  • Xie, Cheng
  • Liu, Shuxuan
  • Lu, Yue
  • Zeng, Lingyan
  • Chen, Zhichao

Abstract

The counter-biased burner arrangement has been confirmed to strengthen mixing between burner jets and reduce the risks of firebrick burning in the fly ash entrained-flow gasifier. The burner centerline angle, which represents the bias angle combination of multiple burners, is a critical factor that requires further experimental investigation to boost the air/particle mixture extent in the improved gasifier. In a 1:8-scale model of the 80,000 Nm3/h fly ash entrained-flow gasifier, air/particle flow characteristics under various burner centerline angles (75°, 72°, and 69°) are obtained by a particle dynamics anemometer. The results show that when the burner centerline angles are 75°, 72°, and 69°, the ratio of total particle volume flux in the near-wall region to the total particle volume flux in the measurement zone is 45.9%, 65.3%, and 57.8%; the ratio of the reflux particle quantity in the mixing zone is 0.88:1.27:1. As the burner centerline angle drops from 75° to 69°, the mixing zone radius decreases from 0.275 to 0.174. Simultaneously, the dimensionless difference of particle volume concentration gradually decreases, indicating that lowering burner centerline angle effectively improves the air-particle mixture extent between the burner jets. An optimal burner centerline angle of 69° is recommended.

Suggested Citation

  • Fang, Neng & Li, Zhengqi & Xie, Cheng & Liu, Shuxuan & Lu, Yue & Zeng, Lingyan & Chen, Zhichao, 2021. "Influence of the multi-burner bias angle on the air/particle flow characteristics in an improved fly ash entrained-flow gasifier," Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:energy:v:234:y:2021:i:c:s0360544221014225
    DOI: 10.1016/j.energy.2021.121174
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    References listed on IDEAS

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