Kinetics Study of Calcium Carbonate Decomposition At High CO2 Environment
- Type: Conference Presentation
- Conference Type: AIChE Annual Meeting
- Presentation Date: October 17, 2011
- Duration: 30 minutes
- Skill Level: Intermediate
- PDHs: 0.50
It was found that there are two competitive mechanisms involved during the processing i.e., chemical reaction and physical diffusion. In order to investigate the dominated effect, we selected the different particles as model compounds for the analysis. As a result, we found the small particle (particle size less than 5 micron) is dominated by chemical reaction mechanism, i.e., CO2 can completely diffusion into the core of the particle and result in a complete chemical reaction to form CaCO3; and the larger particle is dominated by the physical diffusion mechanism, i.e., only partial CO2 can diffuse into the CaO particles and formed a “core-shell” particles, where the centre core is CaO and out-shell is CaCO3. In addition, the small particle always accomplished with a high cycle times and more complete chemical reaction, which was recommended to use in the industry.
Based on the cement processing, various chemical looping processes were used to demonstrate the CaCO3 Calcinations / CaO Carbonation Cycle such as, vacuum processing, solids flow processing, fluidization processing, and cocking gas recycling processing. The energy efficiency, raw material activities, and corresponding thermodynamic date will be presented during the presentation.
|AIChE Member Credits||0.5|
|AIChE Graduate Student Members||Free|
|AIChE Undergraduate Student Members||Free|