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

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

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.

Suggested Citation

  • Liu, Qianqian & Gu, Mingyan & Ouyang, Zihao & Sun, Jingyun & Li, Shuanglong & Chen, Ping & Wang, Yang, 2025. "Study on the oxidation reactivity and NO reduction characteristics of soot in ammonia-doped ethylene flame," Energy, Elsevier, vol. 319(C).
    • Handle: RePEc:eee:energy:v:319:y:2025:i:c:s0360544225007248
    DOI: 10.1016/j.energy.2025.135082
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    References listed on IDEAS

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    1. Ming Gao & Yongjun Jang & Lu Ding & Yunfei Gao & Sheng Dai & Zhenghua Dai & Guangsuo Yu & Wenming Yang & Fuchen Wang, 2023. "Mechanism of the noncatalytic oxidation of soot using in situ transmission electron microscopy," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    2. Luo, Minye & Liu, Dong, 2018. "Effects of dimethyl ether addition on soot formation, evolution and characteristics in flame-wall interactions," Energy, Elsevier, vol. 164(C), pages 642-654.
    3. Li, Youping & Zhang, Yiran & Zhan, Reggie & Huang, Zhen & Lin, He, 2020. "Effects of ammonia addition on PAH formation in laminar premixed ethylene flames based on laser-induced fluorescence measurement," Energy, Elsevier, vol. 213(C).
    4. Chai, Wai Siong & Bao, Yulei & Jin, Pengfei & Tang, Guang & Zhou, Lei, 2021. "A review on ammonia, ammonia-hydrogen and ammonia-methane fuels," Renewable and Sustainable Energy Reviews, Elsevier, vol. 147(C).
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