https://doi.org/10.1016/j.ccst.2021.100011
“Carbonation performances of dry potassium-based adsorbents also depend on bed parameters such as bed height, solid circulation rate and flow pattern or regime. Park et al. investigated the bed height effect by testing the SorbKX35T5 in a bubbling fluidized bed reactor with different L/D (length vs. diameter) ratios (L/D=1, 2, 3 and 4). The maximum amount of CO2 captured could be achieved when L/D ratio was fixed at 3, and this value corresponded to the gas resistance time of 5 s that was sufficient for gas-solid carbonation (Park et al., 2009). Effect of solid circulation rate on CO2 removal efficiency of the SorbKX35 adsorbent had been demonstrated in a dual fluidized-bed reactor system. As solid circulation rate increased in the range of 7-35 kg/(m2•s), CO2 removal efficiency increased from 26% to 53%. Increasing solid circulation rate in the fast fluidized-bed reactor was conducive to increasing solid hold up and extending contact time for enhanced carbonation performance (Yi et al., 2007).”
“Jaiboon et al. reported that carbonation performance of K2CO3/Al2O3 depended on the different flow patterns/regimes in the fluidized/semi circulating fluidized bed. Depending on varied gas velocities (Ug), the fluidization flow patterns were divided into five regimes as fixed-bed regime (Ug=0.01 m/s), multiple-bubbling fluidization regime (Ug=0.2 m/s), slugging fluidization regime (Ug=0.66 m/s), turbulent fluidization regime (Ug=1.02 m/s) and fast fluidization regime (Ug=2.34 m/s). The fixed-bed regime showed poor CO2 uptake while it exhibited good CO2 removal efficiency due to extended gas residence time. The highest CO2 uptake of 2.31 mmol CO2/g was achieved in the turbulent fluidization regime (Jaiboon et al., 2013). These results will provide instructions for the rational design of reactor configuration with appropriate bed parameters as well as the optimization of operating parameters for enhanced carbonation performance.”