Combined calcination, sintering and sulfation model for CaCo₃‐SO₂ reaction

A study on the activity of CaO-based sorbents for capturing CO2 in clean energy processes

“…Since a major effect of sintering is reducing surface area, we relate the activity to the surface area and neglect less important factors. In a number of studies the following expression was used for CaO sintering [21,[30][31][32][33][34]:…”

Simultaneous calcination and sulfation of limestone in CFBB

“…Alvfors and Svedberg [30] investigated the simultaneous calcination, sintering and sulfation of limestone under furnace injection conditions with the partially sintered spheres model. Mahuli et al [15] investigated the similar problem with grain-subgrain model which involved the solid-state ionic diffusion through CaSO 4 production layer. But both of these two models assumed that the calcination of limestone was not hindered by sulfation, and their investigations were under the in-furnace limestone injection conditions with small limestone particle (<50 lm), high reaction temperature (>900°C) and short reaction time (<1.5 s), which meant that the results of their models cannot represent the typical reaction conditions of limestone in CFBB.…”

“…Calcination of limestone is a complex process which involves heat and mass transfer, decomposition reaction accompanied by the sintering of the calcined materials [14,15]. Under different conditions the calcination of limestone may have three rate controlling steps: (1) interface, (2) mass transfer of CO 2 through the CaO product layer, and (3) chemical reaction rate.…”

Modelling of in-duct desulfurization reactors

“…The kinetic modelling of the gas-solid reaction between SO 2 and calcitic sorbents at microscopic level was reported in the literature from the basis of the shrinking core model as well as the grain model in order to describe the experimental results obtained from fixed bed or thermobalance systems at laboratory scale [1][2][3]. An attempt to the modelling of the desulfurization process under in-duct conditions from the basis of the grain model is reported by Garea et al [4], working with data obtained at different calcium to sulfur molar ratios (Ca/S) in a flow reactor system.…”