CO2 capture performance of CaO–based pellets in a 0.1 MWth pilot-scale calcium looping system

Simulation of a calcium looping CO2 capture process for pressurized fluidized bed combustion

“…Their results showed CaO conversions, at the end of the reaction‐controlled stage, of ∼4 % after 20 cycles and residual conversions of < 3 % under similar conditions as the present work. In addition, these low residual activities are in‐line with the carbonation performance observed during pilot‐scale trials with the same sorbent …”

“…It should be noted that this extra carbonation is unavoidable when calcining under high CO 2 environments and has been noted by previous authors when operating at temperatures above 900 °C and 70 vol% CO 2 . Some level of recarbonation can be expected in a real system during transfer of the sorbent to the calciner (using CO 2 ) and has been observed experimentally . The sample is fully calcined before the end of the calcination period, after which the temperature is reduced under pure nitrogen before initiating the next cycle.…”

“…[12,14] Some level of recarbonation can be expected in a real system during transfer of the sorbent to the calciner (using CO 2 ) and has been observed experimentally. [15] The sample is fully calcined before the end of the calcination period, after which the temperature is reduced under pure nitrogen before initiating the next cycle. It should be noted that the CaO conversion used in this work only takes into account the first phase of the carbonation.…”

“…In addition, these low residual activities are in-line with the carbonation performance observed during pilot-scale trials with the same sorbent. [15] The conversion decay model presented in the experimental method section was fitted to all four sets of data, with the resulting model parameters presented in Table 6. Particular attention has been given to how well the model fits the higher cycle number data points (> 10 cycles) due to the importance of high cycle number on the system performance.…”

The effect of HCl and steam on cyclic CO2 capture performance in calcium looping systems

“…Due to the adverse effect of sorbent deactivation on the overall process efficiency, intensive research has been focused on CaO reactivation methods and the development of routes to obtain more stable CaO-based CO 2 sorbents (Kierzkowska, Pacciani, & Muller, 2013) (Valverde, Sanchez-Jimenez, & Perez-Maqueda, 2014). Some of the more researched methods include steam reactivation (Arias, Grasa, & Abanades, 2010) (Fennell, Davidson, Dennis, & Hayhurst, 2007) (Hughes, Lu, Anthony, & Wu, 2004) (Manovic & Anthony, 2007), self-reactivation , sorbent doping (Al-Jeboori, Nguyen, Dean, & Fennell, 2013), pelletized / synthetic sorbents (Symonds, Champagne, Firas, & Lu, 2016) (Blamey, Anthony, Wang, & Fennell, 2010) (Chen, Zhao, Yang , & Zhang, 2012), and recarbonation (Arias, Grasa, Alonso, & Abanades, 2012) (Valverde, Sanchez-Jimenez, & Perez-Maqueda, 2014).…”