Desulfurization device and method for preparing sulfur particles by removing SO2 from flue gas

The invention discloses a desulfurization device and method for preparing sulfur particles by removing SO2 from flue gas. The method specifically comprises the following steps: reducing a desulfurizing agent precursor through reducing gas; taking the desulfurizing agent precursor as a desulfurizing agent for desulfurizing flue gas, converting the SO2 gas in the flue gas into sulfur particles through the desulfurizing agent, and returning the desulfurizing agent through a returner for regenerating the desulfurizing agent. The desulfurizing agent precursor raw material is low in price, and recycling can be easily realized; the energy consumption in the desulfurizing agent regeneration process is greatly simplified, the cost is reduced, and the efficiency of the desulfurization device is improved; the desulfurization device is simple in structure, easy and convenient in operating process, high in controllability and reliable in safety; the SO2 gas conversion rate is high in the desulfurization process, and the sulfur yield is high; and the flue gas reaches the emission standard, the sulfur can be recovered from the flue gas, and recycling, harmlessness and reduction of the SO2 waste gas in the flue gas are realized, so that the defects that the equipment pipeline is blocked and the desulfurization product cannot be recycled in the prior art are overcome.