Experimental study on the effect of ammonia on nanostructure of particulate matters in ethylene laminar diffusion flames

doi:10.3969/j.issn.1674-8484.2023.05.011

Abstract

Abstract:

To analyze the influence of ammonia on the nanostructure of particulate matters (PMs) under dual-fuel combustion conditions, the laminar diffusion flame of ethylene and ammonia/ethylene was studied by using the diffusion flame equipment and the high-resolution transmission electron microscope. The morphology and nanostructure properties of PMs of different flame heights (15 mm and 30 mm) in laminar diffusion flame were analyzed by probe sampling method. The results show that the lift-off height increases with the addition of ammonia from 7 mm to 12 mm in comparation with the ethylene flame; In addition, the morphology of PMs shows a grape-like or chain-like aggregate structure; At the flame height of 15 mm, the addition of ammonia increases the fractal dimension of aggregates from 1.85 to 2.15, by about 16.2%, which means the stacking degree of aggregates increases. Moreover, the aggregate consists of dozens to hundreds of primary particles with an average diameter distribution between 20 nm and 25 nm; The average diameter of primary particles increases by about 6% with the addition of ammonia, while the distance between fringes decreases, the length of fringes increases, the curvature decreases, and the PMs is more stable with the use of ammonia.

Key words: dual-fuel combustion, ethylene/ammonia, laminar diffusion flame, particulate matters, nanostructure properties

CLC Number:

TK448.21

QIAN Weiwei, SHI Xiuyong, LI Song, SHUAI Shijin. Experimental study on the effect of ammonia on nanostructure of particulate matters in ethylene laminar diffusion flames[J]. Journal of Automotive Safety and Energy, 2023, 14(5): 618-627.

Figures/Tables 14

References 31

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内径/ mm	12.1
外径/ mm	88.9
乙烯流量/ (mL·min^-1）	160
伴流空气流量/（L·min^-1）	100
氨气流量/（mL·min^-1）	60

内径/ mm	12.1
外径/ mm	88.9
乙烯流量/ (mL·min^-1）	160
伴流空气流量/（L·min^-1）	100
氨气流量/（mL·min^-1）	60