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In this study, the influence of CO 2 on sulfur capture efficiency was studied during fluidized-bed desulfurization by experiments and modeling. During calcination−sulfation and direct sulfation, the effect was examined with one limestone type. A time-dependent multilayer particle model was used for analyzing the experimental results. The model determines the magnitude of the reactions and the diffusion as a function of the radius and time. In high temperatures (∼1200 K), CO 2 increased the conversion degree during calcination−sulfation. In direct sulfation, the effect of CO 2 was opposite; lower conversion was obtained when the CO 2 concentration was increased. When the CO 2 concentration was increased in low temperatures (∼1100 K) (close to the calcination curve), CO 2 retarded the conversion strongly. The detected differences between the results are explained with the development of the Thiele number, conversion curve, and conversion profile during the reactions.

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