Product Introduction DT Series Desulfurization Pump: Impeller, Guard Plate, and Sleeve are made of metal material. TLR Series Desulfurization Pump: Impeller and Inlet Cover are made of metal, while Guard Plate and Sleeve are made of rubber material. Shaft Seal of the Pump: Mechanical seal. This pump is suitable for: Slurry circulation pump in wet FGD (Flue Gas Desulphurization) projects in power plants.