Technology for producing ammonium sulfate fertilizer through desulfurizing smoke by ammonia process, and apparatus thereof

The invention relates to an apparatus for producing an ammonium sulfate fertilizer through desulfurizing a smoke by an ammonia process, and a method thereof. The apparatus comprises a desulfurization tower, an evaporating crystallizer, a cyclone, a thickener, a centrifuge, a drying machine and a packaging machine, wherein the top of the evaporating crystallizer is provided with a stirrer; the penetration depth of a propeller into the evaporating crystallizer is 1/3-2/3 of the length of the evaporating crystallizer; the upper part of the evaporating crystallizer is provided with a barrel-shaped baffle plate; the diameter of the barrel-shaped baffle plate is 1/3-3/4 of the diameter of the evaporating crystallizer; a guiding cylinder is arranged in the barrel-shaped baffle plate; the diameter of the guiding cylinder is 1/3-2/3 of the diameter of the barrel-shaped baffle plate; the lower part of the guiding cylinder is positioned on the upper part of the propeller of the stirrer; and the upper end opening of the