Homogeneous model (HM) for dynamic breakthrough

“For gas-solid carbonation described by HM, the gas diffusion process could be rapid, and gas would penetrate everywhere into the porous adsorbent. Thus, the gas-solid carbonation proceeded throughout the porous adsorbent, which could be expressed by Eq. (14).”


“in which, f(t) is the time-dependent carbonation conversion, k2=kHCwkH is the rate constant, CA and Cw are the concentrations of K2CO3 and H2O.”

“Onischak et al. proposed the first-order HM for depicting the CO2 sorption kinetic behaviors of pure K2CO3. In HM, reaction rate depended only on CO2 concentration while it was independent of H2O concentration and mass of adsorbents (Onischak and Gidaspow, 1972). Garg et al. further reported that although the CO2 concentration at the exit of fixed-bed reactor could be well predicted by HM, the simulation results of change in gas velocity was 3 times different from the experimental results. Hence, HM showed drawback as it failed to consider the influence of the variation in gas velocity (Garg et al., 2010).”

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