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

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

Energy, 2023, vol. 283, issue C

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.

Keywords: Flameless combustion; Swirl flame combustion; NO-reburning; 20 kW combustion furnace (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:283:y:2023:i:c:s0360544223024647

DOI: 10.1016/j.energy.2023.129070

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