Carbon dioxide capture with dolomite: A model for gas–solid reaction within the grains of a particulate sorbent

CO2 capture with calcined dolomite: the effect of sorbent particle size

“…It is worth noting that milling did affect neither the chemical composition nor the particle internal structure: internal porosity and surface area are quite reproducible in all samples, so that the grain texture assumed in the computational model keeps identical parameter values for all samples. By utilizing equations developed in Stendardo and Foscolo [15], the grain size is estimated to be of the order of 100 nm (Table 2), thus falling in the lower part of the range reported in the literature [21]. As far as the fluidized bed experiments are concerned, the results from the blank test (without calcined dolomite in the bed inventory) enabled the parameters of a simple flow-mixing model to be obtained from the overall gas phase response.…”

“…A spherical grain model has been previously developed to describe the behaviour of a single sorbent particle [15] and its predictive capability verified utilizing experimental data obtained with very fine particles (less than 200 μm). The model can be regarded as a generalized combination of the uniform and shrinking unreacted core models.…”

Towards Solar Thermochemical Carbon Dioxide Capture via Calcium Oxide Looping: A Review

“…Both phenomena were carefully considered in the model developed by Stendardo and Foscolo (2009). They were able to predict total reaction extent for cases in which complete conversion could not be experimentally reached due to mass transfer limitations through the developed product layer.…”

“…Stendardo and Foscolo (2009) and Khoshandam et al (2010) developed models coupling mass transfer and carbonation chemical kinetics. In carbonating particles, as the product layer of calcium carbonate develops, pores shrink and a large fraction of them eventually close, a product layer shell is formed, and mass transfer is restricted.…”

“…(5) has been utilized in models with ψ representing partial pressure, concentration, or density. It has been employed in several analyses of both the calcination and carbonation reactions (Silcox et al, 1989;García-Labiano et al, 2002;Stendardo and Foscolo, 2009;Khoshandam et al, 2010;Lipiński, 2011, 2012;Yu et al, 2012). The source term S   was defined in terms of the chemical reaction rates.…”