In the absorption tower, ammonia is mixed with water to form ammonia solution. SO2 in the flue gas is absorbed here and reacts with ammonia to produce ammonium sulfate.

After desulfurization, the flue gas is discharged into the atmosphere through a 120 meter high chimney. The ammonium sulfate solution is sent to the pre washing tower for recycling. The ammonium sulfate slurry in the pre washing tower enters the dehydration system. First, dehydrate through a hydraulic cyclone, and then obtain ammonium sulfate filter cake through a centrifuge. The clear liquid recovered from the cyclone and centrifuge is returned to the pre scrubber for recycling. The ammonium sulfate filter cake is sent to the granulation system to obtain high utilization value granular ammonium sulfate fertilizer, which is stored in a dome shaped storage bin capable of accommodating 50000 tons of ammonium sulfate before being transported by train or truck.