Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Experimental investigation of n-heptane unsteady-state pyrolysis coking characteristics in microchannel | |
Li, Haowen1,3; Wang, Xiaohan1,2 ; Song, Qianshi1,2; Yang, Zixin1,3; Qi, Wei1,2
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| 2022 | |
| Source Publication | JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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| ISSN | 0165-2370 |
| Volume | 161Pages:12 |
| Corresponding Author | Qi, Wei(qiwei@ms.giec.ac.cn) |
| Abstract | 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. |
| Keyword | n-Heptane Pyrolysis Coking Unsteady-state Coke characterization |
| DOI | 10.1016/j.jaap.2021.105384 |
| WOS Keyword | ENDOTHERMIC HYDROCARBON FUEL ; THERMAL-CRACKING ; COKE DEPOSITION ; SOLID DEPOSITS ; AVIATION KEROSENE ; HEAT-TRANSFER ; JET FUEL ; FLOW ; DODECANE ; CARBON |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51976219] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA 21060102] |
| WOS Research Area | Chemistry ; Energy & Fuels ; Engineering |
| Funding Organization | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences |
| WOS Subject | Chemistry, Analytical ; Energy & Fuels ; Engineering, Chemical |
| WOS ID | WOS:000729310900005 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/35519 |
| Collection | 中国科学院广州能源研究所 |
| Corresponding Author | Qi, Wei |
| Affiliation | 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 |
| First Author Affilication | GuangZhou Institute of Energy Conversion,Chinese Academy of Sciences |
| Recommended Citation 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. |
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