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Comparative study on homogeneous NO-reburning in flameless and swirl flame combustion

Author

Listed:
  • Hu, Fan
  • Li, Pengfei
  • Cheng, Pengfei
  • Shi, Guodong
  • Gao, Yan
  • Liu, Yaowei
  • Ding, Cuijiao
  • Yang, Chao
  • Liu, Zhaohui

Abstract

NO-reburning technology can effectively decrease NOx emissions during combustion. Despite extensive studies have been conducted on NO reburning under traditional combustion, homogeneous NO-reburning characteristics have not been systematically examined in flameless combustion (FLC). This study performs a systematic comparative investigation of homogeneous NO-reburning for the first time via experiments and simulations in a 20-kW furnace. The influences of combustion mode, air-preheating temperature (Ta), and equivalence ratio (Φ) are studied in detail. The experimental results show that FLC can improve NO-reduction efficiency by more than 35% compared to swirl flame combustion (SFC). Moreover, the results also show that reducing Ta from 723 K to 573 K can enhance NO-reburning during FLC, while the NO-reburning is insensitive to Φ in the range of 0.65–0.89. Furthermore, a detailed numerical simulation that couples the eddy-dissipation concept model and a well-verified skeletal mechanism for NO-reburning is validated and performed, to further reveal the reduction pathways of NO. By combining flameless combustion with NO-reburning, this study confirms the preponderance of flameless combustion under low-temperature air conditions (Ta ≤ 573 K) for considerable NO reduction by reburning. The results offer novel fundamental insights into the homogeneous NO-reburning characteristics.

Suggested Citation

  • Hu, Fan & Li, Pengfei & Cheng, Pengfei & Shi, Guodong & Gao, Yan & Liu, Yaowei & Ding, Cuijiao & Yang, Chao & Liu, Zhaohui, 2023. "Comparative study on homogeneous NO-reburning in flameless and swirl flame combustion," Energy, Elsevier, vol. 283(C).
    • Handle: RePEc:eee:energy:v:283:y:2023:i:c:s0360544223024647
    DOI: 10.1016/j.energy.2023.129070
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