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The present contribution focuses on the carbonate looping process, i.e., postcombustion CO 2 capture by means of CaO containing solid sorbents in a system of two circulating fluidized bed reactors. Material and energy balances were performed using the ASPEN PLUS TM software. Two different modeling approaches are applied to the carbonator. First, the entire active fraction of CaO is assumed to be converted; second, the CO 2 absorption efficiency in the circulating fluidized bed is calculated using an analytical 1D model for fast fluidization. The absorption of SO 2 by CaO is taken into account. The overall plant efficiency depends on the mass flows of fresh limestone and circulating CaO. The process is shown to be economically feasible, having low energy penalties in comparison with other CO 2 capture technologies and it seems to be suited for retro-fitting existing power plants.

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The carbonate looping process is an efficient technology for post‐combustion CO2 capture from fossil‐fired power plants. Testing campaigns with continuous CO2 capture were performed in a 1‐MWth carbonate looping pilot plant at the Technische Universität Darmstadt. During two distinguished experimental campaigns the heat for the regeneration of the calcium‐based sorbent in the calciner was provided by propane combustion and combustion of pulverized hard coal, respectively. For several hours of operation, the CO2 concentration in the flue gas was reduced to chemical equilibrium conditions. High overall CO2 capture efficiencies above 90 % were achieved.