Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration

Journal Article (2019)
Authors

Mengmeng Ren (TU Delft - Fluid Mechanics, Xian Jiaotong University)

Shuzhong Wang (Xian Jiaotong University)

Chuang Yang (Xian Jiaotong University)

Haitao Xu (Xian Jiaotong University)

Yang Guo (Xian Jiaotong University)

Dirk J.E.M. Roekaerts (TU Delft - Fluid Mechanics)

Research Group
Fluid Mechanics
Copyright
© 2019 M. Ren, Shuzhong Wang, Chuang Yang, Haitao Xu, Yang Guo, D.J.E.M. Roekaerts
To reference this document use:
https://doi.org/10.1016/j.fuel.2018.09.091
More Info
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Publication Year
2019
Language
English
Copyright
© 2019 M. Ren, Shuzhong Wang, Chuang Yang, Haitao Xu, Yang Guo, D.J.E.M. Roekaerts
Research Group
Fluid Mechanics
Volume number
236
Pages (from-to)
1408-1414
DOI:
https://doi.org/10.1016/j.fuel.2018.09.091
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Abstract

This work reports an experimental study on supercritical water oxidation of quinoline. Moderate preheat temperature (420 °C–510 °C) and initial concentration (1 wt%–10 wt%) are selected to address the possibility of utilizing the heat released during the reaction, in order to realize high conversion rate at relatively low preheat temperature. The effects of temperature, residence time, oxidation ratio, pressure and concentration are analyzed. The results show that considerable conversion can happen at relatively low preheat temperature, while increase in temperature will significantly promote the complete conversion. The yield of carbon dioxide increases with the residence time but there is an upper limit due to the stronger dependence on oxidizer concentration, for which an estimated reaction order is 1.90. When the quinoline concentration is larger than 8 wt%, clear exothermic peaks with temperature rise about 100 °C are detected. These exothermic peaks can be interpreted as a sign of ignition interrupted by the heat loss to the surrounding salt bath. An analogy is made between the start temperatures of these exothermic peaks and the ignition temperatures reported in methanol and isopropanol hydrothermal flame research. We conclude that quinoline solutions can be ignited without co-fuels, at comparable ignition temperature as methanol and isopropanol around 450 °C.

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