Application of the random pore model to the carbonation cyclic reaction
By G. Grasa, R. Murillo, M. Alonso, J. Abanades. 2009
264 citations recorded by the source corpus.
Calcium oxide has been proved to be a suitable sorbent for high temperature CO{sub 2} capture processes based on the cyclic carbonation-calcination reaction. It is important to have reaction rate models that are able to describe the behavior of CaO particles with respect to the carbonation reaction. Fresh calcined lime is known to be a reactive solid toward carbonation, but the average sorbent particle in a CaO-based CO{sub 2} capture system experiences many carbonation-calcination cycles and the reactivity changes with the number of cycles. This study applies the random pore model (RPM) to estimate the intrinsic rate parameters for the carbonation reaction and develops a simple model to calculate particle conversion with time as a function of the number of cycles, partial pressure of CO{sub 2}, and temperature. This version of the RPM model integrates knowledge obtained in earlier works on intrinsic carbonation rates, critical product layer thickness, and pore structure evolution in highly cycled particles.
Subfields: Biomedical Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/cf0e9c72a2f98a13c1786d9e5367405e43e4a464
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Citations in the corpus
- Ca-looping for postcombustion CO2 capture: A comparative analysis on the performances of dolomite and limestone (2015, background): “Particle size in 161 our samples was below 500 μm, thus intra-particle diffusion resistance can be disregarded 162 too [39, 40].”
- Limestone Calcination Nearby Equilibrium: Kinetics, CaO Crystal Structure, Sintering and Reactivity (2015, background): “Carbonation of CaO is initiated by a reaction-controlled 638 phase on the surface of the CaO grains until a thin layer of CaCO3 (between 30 and 50 639 nm thick [35, 63, 64]) is developed, which leads to a much slower phase driven by the 640 counter-current diffusion of inward CO2− 3 anion groups and”
- Multicycle activity of natural CaCO3 minerals for thermochemical energy storage in Concentrated Solar Power plants (2017, methodology): “In another study 81 using particle size fraction from 50 to 600 m (carbonation at 650ºC under PCO2 =0.01MPa; 82 calcination at 900ºC in air), it was concluded that the effect of particle size is almost negligible 83 after the fourth carbonation cycle (Grasa et al., 2009).”
- Calcium-Looping performance of mechanically modified Al2O3-CaO composites for energy storage and CO2 capture (2018, background): “CaL-CO2 capture conditions lead also to the formation of a relatively thinner layer of CaCO3 on the surface of the particles (between 40 a 60 nm) [53] as compared to carbonation conditions for CaL-CSP storage (~100 nm) [56], which would favor solid-state diffusion in the former case.”