At present Flue Gas Desulphurization by Circulating Fluidized Bed (CFB FGD) has been widely used to partly take the place of the Spray Dry Absorbers (SDA) due to its simple system, excellent performance, occupying less area, and less cost, etc. It has been considered internationally as one of the most promising FGD technologies. The mechanism of FGD in CFB is introduced in the paper. Based on the mass transfer theory of two-phases, the fundaments of absorption and adsorption in CFB are analyzed. The influence of particle attrition on mass transfer coefficient of liquid phase is analyzed in terms of the special phenomenon in CFB. The result indicates that abrasion is beneficial to completely utilization of absorbents and further absorption, and it also has an inconspicuously enhanced effect on mass transfer. Fine particle agglomeration is analyzed in the paper and the study results show that the main course of FGD in CFB is absorbing process. Based on the gas absorption, the key parameters that influence desulphurization efficiency are analyzed finally. Mechanism study and influence factors analysis of FGD in CFB could be provided as the references for improving desulphurization.

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