SPOUTED BED TYPE REACTOR FOR SEMI-DRY FLUE GAS DESULFURIZATION AND MULTI- STAGE DESULFURIZATION METHOD USING THEREOF

The present invention relates to a spouted bed type reactor for semi-dry flue gas desulfurization and a multistage desulfurization method using the same. The purpose of the present invention is to remove dust with high density in flue gas including sulfur oxide (SOx), to increase the contact reaction rate of the sulfur oxide (SOx) included in the flue gas with absorbent powder for desulfurization inserted in a reactor by lowering pressure difference between the fore-end and rear-end of the reactor via the improvement of the inflow speed of the flue gas in the reactor and the novel composition of a method for supplying recirculated absorbent powder, and to increase desulfurization rate by conducting the multistage reaction of the sulfur oxide (SOx) with the absorbent powder in the reactor. The spouted bed type reactor for semi-dry flue gas desulfurization according to the present invention comprises a gravity-type settling box (1); a venturi part (2) for increasing the flow rate of the flue gas; a main body (3) of the reactor composed of a conic fluidizing part (31) for removing the sulfur oxide while flowing with the absorbent powder for desulfurization and a fluidizing part (32) for removing the sulfur oxide by circulating and flowing water sprayed upward, the flue gas and absorbent powder; a absorbent powder supply device (4) for supplying the absorbent powder for desulfurization with compressed air into the conic fluidizing part; a recirculated absorbent powder supply device (5) for re-supplying unreacted absorbent powder for desulfurization into the conic fluidizing part; and a water spray supply device (6) for spraying water and compressed water upward. Also the present invention provides a multistage desulfurization method using the spouted bed type reactor for semi-dry flue gas desulfurization. [Reference numerals] (AA) Combustion flue gas