Dry cyclic suspension bed fume desulfurizing process and its system

The present invention relates to a dry fume desulfurizing process by circulation suspending bed and its system, in particular it relates to a method for removing sulfur oxide from fume and its equipment. It is characterized by that the substance formed by mixing dry lime, fly ash separated from dust collector and water according to a certain proportion is used as absorbing agent, and said system consists of a low-resistance fume jet structure whose interior is equipped with separation component and exterior is equipped with low-resistance separator. As compared with existent technology said invention is simple in technology system, compact in structure, high in reliability of said system, low in operation cost, and can obtain high desulfurizing effect which can be up to above 90% under the condition of lower calcium-sulfur ratio (1.2-1.4).