TY - JOUR
T1 - Supercritical water oxidation of quinoline with moderate preheat temperature and initial concentration
AU - Ren, Mengmeng
AU - Wang, Shuzhong
AU - Yang, Chuang
AU - Xu, Haitao
AU - Guo, Yang
AU - Roekaerts, Dirk
N1 - Accepted Author Manuscript
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - Heat release
KW - Ignition
KW - Initial concentration
KW - Preheat temperature
KW - Quinoline
KW - Supercritical water oxidation (SCWO)
UR - http://resolver.tudelft.nl/uuid:f58aa038-8395-454c-b6e9-cadc05120201
UR - http://www.scopus.com/inward/record.url?scp=85054050583&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2018.09.091
DO - 10.1016/j.fuel.2018.09.091
M3 - Article
AN - SCOPUS:85054050583
SN - 0016-2361
VL - 236
SP - 1408
EP - 1414
JO - Fuel
JF - Fuel
ER -