Limestone slurry mixers are essential in power plants for desulfurization and denitration processes, fulfilling the requirement to reduce carbon dioxide emissions. These mixers ensure that the powdered limestone, primarily composed of calcium carbonate, is mixed with water to prevent settling and create an absorbent. Due to the corrosive nature of the mixing process after adding water to the limestone powder, the mixer material should ideally be 316L stainless steel or lined with rubber. The impellers are typically axial flow mixers to prevent sedimentation, with a speed of around 51-83 RPM. The mixed slurry is then transported to the absorption tower, where it allows for thorough mixing and contact with the flue gas, oxidizing sulfur dioxide in the gas, calcium carbonate in the slurry, and air blown from the top of the absorption tower to form calcium sulfate. When selecting limestone slurry mixers, attention should be given to the choice of material and the mixer's linear velocity, with an emphasis on a linear velocity of 3 or higher to ensure thorough mixing of limestone with the liquid and prevent sedimentation.
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