Alkaline absorbents for SO and SO removal: A comprehensive review.

Injection of an alkaline absorbent into the flue gas can significantly reduce SO and SO emissions. The article presents alkaline absorbents employed in industrial processes to remove SO and SO from flue gases, detailing their characteristics and applications across various process conditions. It summarizes the mechanisms and influencing factors behind SO and SO removal, outlines the impact of multi-component gases, particularly SO, on SO removal in actual flue gases, and elucidates this competitive phenomenon from a theoretical standpoint. The article compares the application scenarios and efficiencies of alkaline absorbents across different processes, identifies the optimal combinations of various absorbents and processes, and proposes a synergistic approach for the removal of SO and SO. The findings demonstrate that by injecting calcium- or sodium-based absorbents into dry processes, SO and SO can be removed efficiently and cost-effectively, with process optimization and absorbent modifications further enhancing the SO removal efficiency. In the future, by blending two or more absorbents and applying them to dry processes, a synergistic removal of SO and SO can be achieved.