Carbon dioxide capture from combustion flue gases with a calcium oxide chemical loop. Experimental results and process development

Direct Gas–Solid Carbonation Kinetics of Steel Slag and the Contribution to In situ Sequestration of Flue Gas CO2 in Steel‐Making Plants

“…carbonation temperature for steel slag was 600 8C in this study, which was clearly higher than the optimal temperature for air pollution control system residues (400-500 8C) [27,30,31] but close to the optimal temperature for limestone or other CaO-based adsorbents (600-700 8C). [29,38,39] The influence of CO 2 concentration (Figure 3) and the presence of SO 2 ( Figure 4) on the carbonation conversion of steel slag was not as strong as that of temperature. As shown in Figure 3, all sequestration curves were similar over a reaction time of 1 h; the curve representing the carbonation between steel slag and 100 % CO 2 was slightly higher than the other three, and the uptake of CO 2 gradually increased as the CO 2 concentration increased in the simulated flue gases.…”

High-temperature CO2 capture cycles for CaO-based pellets with kaolin-based binders

“…Calcium looping is a new emerging technology for CO 2 separation and capture from flue gas (Yongping et al, 2010;Alonso et al, 2010). In this approach, a CaO-based sorbent is circulated between two different reactors, i.e., carbonation and calcination, to achieve cyclic capture of CO 2 , as shown schematically in Fig.…”

High-pressure systems and processes for calcium looping

“…The majority of designs for CaOeCO 2 capture systems in operation or under construction incorporate two fluidized beds with solid transport between them (Alonso et al, 2010;Hughes, Lu, Anthony, & Macchi, 2005;Pfeifer, Puchner, & Hofbauer, 2007;Symonds & Lu, 2009). One bed acts as the carbonator and the other as the calciner.…”