Naslov
Kinetics study on the effect of oxygen concentration on soot oxidation in O2/Co2 atmosphere at high temperatures

Autori
Li, Shuaishuai ; Liu, Zihan ; Wang, Xuebin ; Adeosun, Adewale ; Vujanović, Milan ; Tan, Houzhang ; Neven Duić, Neven ; Mikulčić, Hrvoje

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Digital Proceedings of 2nd South East European Conference on Sustainable Development of Energy, Water and Environment Systems - SEE SDEWES / Ban, Marko et al. - Zagreb, 2016

Skup
2nd South East European Conference on Sustainable Development of Energy, Water and Environment Systems - SEE SDEWES

Mjesto i datum
Piran, Slovenija, 15.06.2016. - 18.06.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
soot oxidation; oxy-fuel combustion; reaction kinetics; thermogravimetry analysis

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA