Effects of molecular structures on the pyrolysis and anti-coking performance of alkanes for thermal management

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• 作者：Daoan Sun^a ; ^b ; Yongmei Du^a ; ^b ; Jianwei Zhang^a ; ^b ; Yi Jiao^a ; ^b ; Yuan Li^a ; ^b ; Zhixuan Wang^a ; ^b ; Chunying Li^a ; ^b ; Hao Feng^b ; Jian Lu^a ; ^b ; ^{lujian204@263.net}
• 关键词：HRM ; hydraulic resistance method ; NPEC ; normal alkanes with even carbon number ; NPOC ; normal alkanes with adjacent odd carbon number ; EHFs ; endothermic hydrocarbon fuels ; HS ; heat sink ; RT ; residence time ; S ; signal ; T ; temperature ; ED ; effective diameter ; PAHs ; polycyclic aromatic hydrocarbons
• 刊名：Fuel
• 出版年：2017
• 出版时间：15 April 2017
• 年：2017
• 卷：194
• 期：Complete
• 页码：266-273
• 全文大小：1665 K
• 卷排序：194

文摘

Pyrolysis of normal- and iso-alkanes were carried out using a supercritical cracking experimental apparatus equipped with an electrically heated tubular reactor under supercritical conditions (3.5 MPa and 700 °C). The hydraulic resistance method (HRM) was applied to quantitatively evaluate the carbon deposition. Effects of molecular structures on the pyrolysis and anti-coking performance of alkanes were studied. It was found that the gas yield and heat sink (HS) increased with the increasing carbon chain length of normal alkanes. Normal alkanes with even carbon number (NPEC) exhibited better anti-coking performance than those with adjacent odd carbon number (NPOC). Compared with normal alkanes, iso-alkanes could generate higher gas yields. However, lower HS and yield of hydrogen and alkenes (⩽C4), as well as poorer resistance to carbon deposition were observed for iso-alkanes with more than two methyls. There was an optimum value of the ratio of NPEC/NPOC for the balanced HS and anti-coking performance in the design of high-performance endothermic hydrocarbon fuels (EHFs).