Experimental investigation of n-heptane unsteady-state pyrolysis coking characteristics in microchannel

doi:10.1016/j.jaap.2021.105384

GIEC OpenIR

	Experimental investigation of n-heptane unsteady-state pyrolysis coking characteristics in microchannel
	Li, Haowen 1,3; Wang, Xiaohan1,2 ; Song, Qianshi 1,2; Yang, Zixin 1,3; Qi, Wei1,2
	2022
发表期刊	JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
ISSN	0165-2370
卷号	161 页码:12
通讯作者	Qi, Wei(qiwei@ms.giec.ac.cn)
摘要	Coke deposition is considered a challenging problem during hydrocarbon pyrolysis. To get more insights into pyrolysis coking characteristics in the regenerative cooling channels, the unsteady-state experiments of n-heptane were performed in a 2.0 mm (internal diameter) passivated STS304 tube at 873-1073 K and 1.0 MPa with a feeding flow rate of 1.0 mL/min during pyrolysis for 5-60 min. The unsteady-state and spatial coke distributions were obtained. Results showed three distinct stages of coking, namely, catalytic coking, the transition stage, and pyrolytic coking. Coke samples obtained under different temperatures were characterized by element analyzer, scanning electron microscope (SEM), thermogravimeter coupled with a Fourier transform infrared spectroscopy (TG-FTIR), X-ray diffraction (XRD), and Raman spectra apparatus. The coke could be classified into two or three types according to its oxidative activity, and was composed of aromatic carbon and aliphatic hydrocarbons. The morphology of the coke transitions from filamentous to spherical with temperature and pyrolysis time. The C/H ratio of coke increased with the temperature in the catalytic coking stage, but decreased in the pyrolytic coking stage. High H contents and extensive defects of the coke observed at high temperatures could attributed to the generation of large amounts of pyrolytic coke and high coking rate, which resulting a lower degree of dehydrogenation. The presence of metallic substances in the coke verifies the catalytic effect at the beginning of coking and indicates the occurrence of carburization corrosion.
关键词	n-Heptane Pyrolysis Coking Unsteady-state Coke characterization
DOI	10.1016/j.jaap.2021.105384
关键词[WOS]	ENDOTHERMIC HYDROCARBON FUEL ; THERMAL-CRACKING ; COKE DEPOSITION ; SOLID DEPOSITS ; AVIATION KEROSENE ; HEAT-TRANSFER ; JET FUEL ; FLOW ; DODECANE ; CARBON
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51976219] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA 21060102]
WOS研究方向	Chemistry ; Energy & Fuels ; Engineering
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
WOS类目	Chemistry, Analytical ; Energy & Fuels ; Engineering, Chemical
WOS记录号	WOS:000729310900005
出版者	ELSEVIER
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/35519
专题	中国科学院广州能源研究所
通讯作者	Qi, Wei
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, 2 Nengyuan Rd, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Key Lab Renewable Energy, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Li, Haowen,Wang, Xiaohan,Song, Qianshi,et al. Experimental investigation of n-heptane unsteady-state pyrolysis coking characteristics in microchannel[J]. JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS,2022,161:12.
APA	Li, Haowen,Wang, Xiaohan,Song, Qianshi,Yang, Zixin,&Qi, Wei.(2022).Experimental investigation of n-heptane unsteady-state pyrolysis coking characteristics in microchannel.JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS,161,12.
MLA	Li, Haowen,et al."Experimental investigation of n-heptane unsteady-state pyrolysis coking characteristics in microchannel".JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS 161(2022):12.