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Effects of ammonia addition on the soot nanostructure and oxidation reactivity in n-heptane/toluene diffusion flames

Authors :
Qing Li
Bo Tian
Lei Xu
Yu Wang
Source :
Fuel Processing Technology, Vol 257, Iss , Pp 108090- (2024)
Publication Year :
2024
Publisher :
Elsevier, 2024.

Abstract

Co-firing NH3 with conventional hydrocarbon fuels is an important approach for reducing CO2 emissions in existing combustion systems. Besides CO2, the blending of NH3 would also notably affect soot formation and its oxidation behaviors. In the present study, we focus on the effects of NH3 on the nanostructure and oxidation characteristics of soot produced in diffusion flames of n-heptane/toluene mixtures. Two configurations of laminar co-flow diffusion flame, including both normal and inverse diffusion flames (NDF and IDFs), were used for investigation. High-resolution transmission electron microscopy (HRTEM), Raman spectroscopy (Raman), and Thermogravimetric analysis (TGA) were employed for soot characterization. The HRTEM and Raman spectra showed that with the increase of NH3 blending ratio, the fringe length (La) and the degree of graphitization decreased while the microcrystal tortuosity (Tf) increased. The results are in consistent with TGA analysis which suggests the promoting effects of NH3 on the soot oxidation reactivity. Difference between NDF and IDF with respect to the soot nanostructure and oxidation activity were discussed. It is our hope that the present results could deepen our understanding on the effects of NH3 on soot nanostructure and oxidation behavior and benefit the design of particulate filters for combustion devices fueled with hydrocarbon/NH3 mixtures.

Details

Language :
English
ISSN :
03783820
Volume :
257
Issue :
108090-
Database :
Directory of Open Access Journals
Journal :
Fuel Processing Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.5c0701245b05457ca2ba1d660f229739
Document Type :
article
Full Text :
https://doi.org/10.1016/j.fuproc.2024.108090