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Postcombustion CO₂ capture using CaO as a regenerable solid sorbent in a circulating fluidized bed (CFB) carbonator is emerging as a promising CO₂ capture technology. Experimental validation of this concept is provided through a comparative analysis of the results obtained in two laboratory-scale dual fluidized bed (DFB) installations located at INCAR-CSIC (Spain) and IFK (Germany). The analysis is focused on the performance of the CFB carbonator reactors operated with continuous solid circulation of CaO. A reasonable closure of the carbon balances (i) between the CO₂ that has disappeared from the gas phase, (ii) the CaCO₃ circulating between the reactors, and (iii) the CaCO₃ that is formed within the carbonator bed has been established. A necessary condition for the capture of a given molar flow of CO₂ is experimentally demonstrated and requires that a slightly overstoichiometric molar flow of active …