Experimental study on pyrolysis coking characteristics of supercritical n-decane in corrugated channel

•The wall temperature of the corrugated channel is reduced by up to 32°C, and the heat transfer coefficient is increased by 1.2-1.5 times comparing with smooth channel.•The coking amount in corrugated channel is 26 % of that in smooth channel.•The corrugated channel hardly affects the chemical heat...

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Published inInternational journal of heat and mass transfer Vol. 234; p. 126123
Main Authors Xie, Bensheng, Han, Huaizhi, Gao, Ruichen, Luo, Wen, Yu, Ruitian
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2024
Subjects
Coking amount
Corrugated channel
Experimental study
Pyrolysis coking
Supercritical hydrocarbon fuel
Corrugated channel
Supercritical hydrocarbon fuel
Coking amount
Experimental study
Pyrolysis coking
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Summary:•The wall temperature of the corrugated channel is reduced by up to 32°C, and the heat transfer coefficient is increased by 1.2-1.5 times comparing with smooth channel.•The coking amount in corrugated channel is 26 % of that in smooth channel.•The corrugated channel hardly affects the chemical heat sinking of hydrocarbon fuel.•The content of filamentous carbon in the corrugated channel is significantly less than that in smooth channel. This study experimentally investigates the pyrolysis coking characteristics of supercritical n-decane in the corrugated channel. Experimental results show that the corrugated channel can effectively decrease wall temperature, with a maximum reduction up to 32°C compared to the smooth channel. And the heat transfer coefficient of the corrugated channel is 1.2-1.5 times higher than that of the smooth channel. Furthermore, the corrugated channel effectively reduces coking amount by 26 % compared to the smooth channel. Analysis of gas and liquid phase products show that the corrugated channel has little influence on the chemical heat sink change of n-decane. SEM analysis of the coke indicates that the corrugated channel effectively suppresses metal-catalyzed coking and decreases the content of filamentous carbon. The EDS results indicate that the coking layer inside the channel is relatively thin, and there is less coke in the corrugated channel compared to the smooth channel.
ISSN:0017-9310
DOI:10.1016/j.ijheatmasstransfer.2024.126123