Kinetics study on the effect of oxygen concentration on soot oxidation in O2/Co2 atmosphere at high temperatures (CROSBI ID 636717)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Li, Shuaishuai ; Liu, Zihan ; Wang, Xuebin ; Adeosun, Adewale ; Vujanović, Milan ; Tan, Houzhang ; Neven Duić, Neven ; Mikulčić, Hrvoje
engleski
Kinetics study on the effect of oxygen concentration on soot oxidation in O2/Co2 atmosphere at high temperatures
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.
soot oxidation; oxy-fuel combustion; reaction kinetics; thermogravimetry analysis
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Podaci o prilogu
2016.
objavljeno
Podaci o matičnoj publikaciji
Digital Proceedings of 2nd South East European Conference on Sustainable Development of Energy, Water and Environment Systems - SEE SDEWES
Ban, Marko et al.
Zagreb:
1847-7179
Podaci o skupu
2nd South East European Conference on Sustainable Development of Energy, Water and Environment Systems - SEE SDEWES
poster
15.06.2016-18.06.2016
Piran, Slovenija