Study on the oxidation reactivity and NO reduction characteristics of soot in ammonia-doped ethylene flame

Qianqian Liu, Mingyan Gu, Zihao Ouyang, Jingyun Sun, Shuanglong Li, Ping Chen and Yang Wang

Energy, 2025, vol. 319, issue C

Abstract: Ammonia-doped ethylene combustion generated significant quantities of NOx and soot. In this study, The oxidation reactivity and reduction NO characteristics of soot were investigated using a thermogravimetric analyser and a high temperature tube furnace, respectively. The results from the oxidation reactivity analyses indicated that ammonia blending enhanced the oxidation reactivity of soot. Compared to centerline region soot, flame wing region soot underwent two distinct stages of growth and oxidation, exhibiting higher maturity. The agglomerates in flame wing region contain a greater proportion of primitive particles with the core-shell structure, resulting in lower reactivity. Experimental findings on the NO reduction characteristics of soot revealed that the order of NO reduction efficiency from high to low is: soot + NH3 > NH3 > soot. The interaction between soot and NH3 facilitated the heterogeneous reduction of NO. Furthermore, this efficiency can be further enhanced by soot extracted from ammonia-doped ethylene flames. Increasing the ammonia nitrogen ratio (NSR) lead to an improvement in the efficiency of NO reduction. The rate of NO reduction increased rapidly with rising temperature but exhibited minimal change once temperatures exceed 1573 K.

Keywords: Oxidation reactivity; NO reduction; High temperature reduction zone; Soot; Ammonia doping (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:319:y:2025:i:c:s0360544225007248

DOI: 10.1016/j.energy.2025.135082

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