Evolution of structure and oxidation reactivity from early-stage soot to mature soot sampled from a laminar coflow diffusion flame of ethylene

doi:10.1016/j.combustflame.2021.02.004

	Evolution of structure and oxidation reactivity from early-stage soot to mature soot sampled from a laminar coflow diffusion flame of ethylene
	Liu, Peng 2; Ahmad, Hafiz 2; Jiang, Xuesong 2; Chen, Hongyu 2; Lin, Yan 1; Mei, Bowen 2; Li, Yuyang 2
刊名	COMBUSTION AND FLAME
	2021-06-01
卷号	228 页码:202-209
关键词	Laminar coflow diffusion flame Soot sampling Soot structure Soot oxidation reactivity Distributed activation energy model
ISSN号	0010-2180
DOI	10.1016/j.combustflame.2021.02.004
通讯作者	Li, Yuyang(yuygli@sjtu.edu.cn)
英文摘要	This work investigated the structure and oxidation reactivity of soot sampled from a laminar coflow dif-fusion flame of ethylene. A capillary-nozzle-hybrid sampling method was developed to extract soot from five sampling positions along flame axis, covering both early-stage and mature soot samples. The results reveal that residence time plays an important role in modifying surface functional groups. Oxygenated and aliphatic groups gradually disappear, soot structure becomes more organized. As a consequence, the rate of mass losses is impaired during thermo-chemical conversion. The derivative thermogravime-try (DTG) results show that oxidation of early-stage soot can be separated into low-temperature (low-T) conversion and carbonaceous substances oxidation processes. The former process including both volatile organic fraction (VOF) releasing and early oxidation reactions generates the first maximum mass loss rate at about 510 degrees C, while the latter forms the second maximum mass loss rate at about 600 degrees C. Recognizing that the two processes are partially merged, the distributed activation energy model (DAEM) was intro-duced to decouple the bimodal behavior of DTG curves. The DAEM results reveal that with increased degree of soot maturity, relative contribution from low-T conversion process decreases abruptly, and DTG curve eventually becomes unimodal and can be well simulated by considering only carbonaceous sub-stances oxidation process. (c) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
资助项目	National Key R&D Program of China[2017YFE0123100] ; National Natural Science Foundation of China[91841301] ; National Natural Science Foundation of China[U1832171]
WOS关键词	ACTIVATION-ENERGY MODEL ; CHEMICAL-CHARACTERIZATION ; SPECIES CONCENTRATIONS ; AROMATIC-HYDROCARBONS ; SURFACE-CHEMISTRY ; DIESEL SOOT ; COMBUSTION ; NANOSTRUCTURE ; PYROLYSIS ; BEHAVIOR
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000640953900005
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/33040]
专题	中国科学院广州能源研究所
通讯作者	Li, Yuyang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510650, Peoples R China 2.Shanghai Jiao Tong Univ, Sch Mech Engn, Key Lab Power Machinery & Engn, MOE, Shanghai 200240, Peoples R China
推荐引用方式 GB/T 7714	Liu, Peng,Ahmad, Hafiz,Jiang, Xuesong,et al. Evolution of structure and oxidation reactivity from early-stage soot to mature soot sampled from a laminar coflow diffusion flame of ethylene[J]. COMBUSTION AND FLAME,2021,228:202-209.
APA	Liu, Peng.,Ahmad, Hafiz.,Jiang, Xuesong.,Chen, Hongyu.,Lin, Yan.,...&Li, Yuyang.(2021).Evolution of structure and oxidation reactivity from early-stage soot to mature soot sampled from a laminar coflow diffusion flame of ethylene.COMBUSTION AND FLAME,228,202-209.
MLA	Liu, Peng,et al."Evolution of structure and oxidation reactivity from early-stage soot to mature soot sampled from a laminar coflow diffusion flame of ethylene".COMBUSTION AND FLAME 228(2021):202-209.