Li, Shuaishuai and Liu, Zihan and Wang, Xuebin and Adeosun, Adewale and Vujanović, Milan and Tan, Houzhang and Duić, Neven and Mikulčić, Hrvoje (2016) Kinetics study on the effect of oxygen concentration on soot oxidation in O2 / Co2 atmosphere at high temperatures. = Kinetics study on the effect of oxygen concentration on soot oxidation in O2 / Co2 atmosphere at high temperatures. In: 2nd South East European Conference on Sustainable Development of Energy, Water and Environment Systems - SEE SDEWES, 15.-18.06.2016., Piran.
Full text not available from this repository.Abstract
Soot produced in carbon-based fuel combustion is one kind of ultrafine particulate matter emission, which also contributes a remarkable effect on flame temperature due to its extremely intense radiation. Under oxy-fuel combustion condition, the reaction environment in O2/CO2 atmosphere should be changed in compared with air atmosphere. In the present study, the reaction kinetics of soot oxidation in O2/CO2 atmosphere at high temperatures was investigated by using thermogravimetry analysis (TGA). The reaction atmosphere and oxygen concentration (C) were mainly considered, aiming to establishing the quantitative relation between C and the kinetics parameters including apparent activation energy (E) and frequency factor (A) for soot-oxidation under oxy-fuel combustion conditions. Results show that in O2/CO2 atmosphere, both starting and ending temperatures of soot-oxidation increased indicating the reactivity is inhibited in contrast with that in O2/N2 atmosphere. With the increasing in oxygen concentration, the mass loss curve moves toward the lower temperature region, the maximum mass loss rate increases, and the reactivity is significantly enhanced. In O2/CO2 atmosphere, the kinetics calculation shows A strongly depends on E following the relation LnA=-11.38+0.17×E. When C is below 20%, E linearly increases with the increasing in C as E=82.27+485.46×C (kJ.mol-1), and the reaction rate of soot-oxidation is dα/dt=19.49×exp[77.41C-(82270+485460C)/RT]×(1-α) ; however, when C is above 20%, E and A are almost unchanged at about 172.96 kJ.mol-1 and 7.861×107 s-1 , respectively, and the reaction rate of soot-oxidation is dα/dt=7.861×107×exp(-172960/RT) ×(1-α). This study is beneficial to provide a general quantitative description on the reaction kinetics of soot-oxidation in oxy-fuel combustion with oxygen concentration changing.
| Item Type: | Conference or Workshop Item (Poster) |
|---|---|
| Keywords (Croatian): | soot oxidation, oxy-fuel combustion, reaction kinetics, thermogravimetry analysis |
| Subjects: | TECHNICAL SCIENCE > Mechanical Engineering |
| Divisions: | 500 Department of Energy, Power Engineering and Environment > 510 Power Engineering and Energy Management Chair |
| Indexed in Web of Science: | No |
| Indexed in Current Contents: | No |
| Date Deposited: | 21 Sep 2016 08:09 |
| Last Modified: | 15 Mar 2018 07:36 |
| URI: | http://repozitorij.fsb.hr/id/eprint/6598 |
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