282409 Kinetic Studies of Calcium Oxide Carbonation At Different CO2 Environments
Kinetic Studies of Calcium Oxide Carbonation at Different CO2 Environments
Zhang Lele, Duan Yonghua, Li Hui, Min Yong
- Xi'an University of Architecture and Technology; Xi'an Shaanxi 710055; China;
The paper investigates the kinetics analysis pure CaO carbonation by utilizing thermogravimetric analyzer (TGA) at different heating rate (2.5 K/min, 7.5 K/min, 15 K/min, 20 K/min, 30 K/min) and different concentration of CO2 atmosphere (0%, 30%, 50%, 80%, 100%). Double extrapolation method (Flynn-Wall-Ozawa) was used to obtain the apparent activation energy when conversion rate tends zero; Then use Coats-Redfern integral equation, push the heating rate to zero to get the activation energy of the sample in the thermal equilibrium state; Finally by comparing E-Bata with E-Alpha , confirmed the most probable function of the CaO carbonation in different atmosphere , thus get the dynamic reaction model , exponential factor A and reaction rate constant k, and the changing rule of the activation energy E-alpha of CaO carbonation with different atmosphere
Key words: CaO carbonation; thermal analysis kinetics; double extrapolation method；the apparent activation energy E; dynamic reaction model.
See more of this Group/Topical: Computing and Systems Technology Division